Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_SCHED_H |
2 | #define _LINUX_SCHED_H | |
3 | ||
b7b3c76a DW |
4 | /* |
5 | * cloning flags: | |
6 | */ | |
7 | #define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ | |
8 | #define CLONE_VM 0x00000100 /* set if VM shared between processes */ | |
9 | #define CLONE_FS 0x00000200 /* set if fs info shared between processes */ | |
10 | #define CLONE_FILES 0x00000400 /* set if open files shared between processes */ | |
11 | #define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ | |
12 | #define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ | |
13 | #define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ | |
14 | #define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ | |
15 | #define CLONE_THREAD 0x00010000 /* Same thread group? */ | |
16 | #define CLONE_NEWNS 0x00020000 /* New namespace group? */ | |
17 | #define CLONE_SYSVSEM 0x00040000 /* share system V SEM_UNDO semantics */ | |
18 | #define CLONE_SETTLS 0x00080000 /* create a new TLS for the child */ | |
19 | #define CLONE_PARENT_SETTID 0x00100000 /* set the TID in the parent */ | |
20 | #define CLONE_CHILD_CLEARTID 0x00200000 /* clear the TID in the child */ | |
21 | #define CLONE_DETACHED 0x00400000 /* Unused, ignored */ | |
22 | #define CLONE_UNTRACED 0x00800000 /* set if the tracing process can't force CLONE_PTRACE on this clone */ | |
23 | #define CLONE_CHILD_SETTID 0x01000000 /* set the TID in the child */ | |
43bb40c9 DJ |
24 | /* 0x02000000 was previously the unused CLONE_STOPPED (Start in stopped state) |
25 | and is now available for re-use. */ | |
071df104 | 26 | #define CLONE_NEWUTS 0x04000000 /* New utsname group? */ |
25b21cb2 | 27 | #define CLONE_NEWIPC 0x08000000 /* New ipcs */ |
77ec739d | 28 | #define CLONE_NEWUSER 0x10000000 /* New user namespace */ |
30e49c26 | 29 | #define CLONE_NEWPID 0x20000000 /* New pid namespace */ |
169e3674 | 30 | #define CLONE_NEWNET 0x40000000 /* New network namespace */ |
fadad878 | 31 | #define CLONE_IO 0x80000000 /* Clone io context */ |
b7b3c76a DW |
32 | |
33 | /* | |
34 | * Scheduling policies | |
35 | */ | |
36 | #define SCHED_NORMAL 0 | |
37 | #define SCHED_FIFO 1 | |
38 | #define SCHED_RR 2 | |
39 | #define SCHED_BATCH 3 | |
0e6aca43 IM |
40 | /* SCHED_ISO: reserved but not implemented yet */ |
41 | #define SCHED_IDLE 5 | |
ca94c442 LP |
42 | /* Can be ORed in to make sure the process is reverted back to SCHED_NORMAL on fork */ |
43 | #define SCHED_RESET_ON_FORK 0x40000000 | |
b7b3c76a | 44 | |
a3b6714e | 45 | #ifdef __KERNEL__ |
b7b3c76a DW |
46 | |
47 | struct sched_param { | |
48 | int sched_priority; | |
49 | }; | |
50 | ||
1da177e4 LT |
51 | #include <asm/param.h> /* for HZ */ |
52 | ||
1da177e4 LT |
53 | #include <linux/capability.h> |
54 | #include <linux/threads.h> | |
55 | #include <linux/kernel.h> | |
56 | #include <linux/types.h> | |
57 | #include <linux/timex.h> | |
58 | #include <linux/jiffies.h> | |
59 | #include <linux/rbtree.h> | |
60 | #include <linux/thread_info.h> | |
61 | #include <linux/cpumask.h> | |
62 | #include <linux/errno.h> | |
63 | #include <linux/nodemask.h> | |
c92ff1bd | 64 | #include <linux/mm_types.h> |
1da177e4 LT |
65 | |
66 | #include <asm/system.h> | |
1da177e4 LT |
67 | #include <asm/page.h> |
68 | #include <asm/ptrace.h> | |
1da177e4 LT |
69 | #include <asm/cputime.h> |
70 | ||
71 | #include <linux/smp.h> | |
72 | #include <linux/sem.h> | |
73 | #include <linux/signal.h> | |
1da177e4 LT |
74 | #include <linux/compiler.h> |
75 | #include <linux/completion.h> | |
76 | #include <linux/pid.h> | |
77 | #include <linux/percpu.h> | |
78 | #include <linux/topology.h> | |
3e26c149 | 79 | #include <linux/proportions.h> |
1da177e4 | 80 | #include <linux/seccomp.h> |
e56d0903 | 81 | #include <linux/rcupdate.h> |
05725f7e | 82 | #include <linux/rculist.h> |
23f78d4a | 83 | #include <linux/rtmutex.h> |
1da177e4 | 84 | |
a3b6714e DW |
85 | #include <linux/time.h> |
86 | #include <linux/param.h> | |
87 | #include <linux/resource.h> | |
88 | #include <linux/timer.h> | |
89 | #include <linux/hrtimer.h> | |
7c3ab738 | 90 | #include <linux/task_io_accounting.h> |
9745512c | 91 | #include <linux/latencytop.h> |
9e2b2dc4 | 92 | #include <linux/cred.h> |
a3b6714e DW |
93 | |
94 | #include <asm/processor.h> | |
36d57ac4 | 95 | |
1da177e4 | 96 | struct exec_domain; |
c87e2837 | 97 | struct futex_pi_state; |
286100a6 | 98 | struct robust_list_head; |
bddd87c7 | 99 | struct bio_list; |
5ad4e53b | 100 | struct fs_struct; |
cdd6c482 | 101 | struct perf_event_context; |
1da177e4 | 102 | |
1da177e4 LT |
103 | /* |
104 | * List of flags we want to share for kernel threads, | |
105 | * if only because they are not used by them anyway. | |
106 | */ | |
107 | #define CLONE_KERNEL (CLONE_FS | CLONE_FILES | CLONE_SIGHAND) | |
108 | ||
109 | /* | |
110 | * These are the constant used to fake the fixed-point load-average | |
111 | * counting. Some notes: | |
112 | * - 11 bit fractions expand to 22 bits by the multiplies: this gives | |
113 | * a load-average precision of 10 bits integer + 11 bits fractional | |
114 | * - if you want to count load-averages more often, you need more | |
115 | * precision, or rounding will get you. With 2-second counting freq, | |
116 | * the EXP_n values would be 1981, 2034 and 2043 if still using only | |
117 | * 11 bit fractions. | |
118 | */ | |
119 | extern unsigned long avenrun[]; /* Load averages */ | |
2d02494f | 120 | extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift); |
1da177e4 LT |
121 | |
122 | #define FSHIFT 11 /* nr of bits of precision */ | |
123 | #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ | |
0c2043ab | 124 | #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */ |
1da177e4 LT |
125 | #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ |
126 | #define EXP_5 2014 /* 1/exp(5sec/5min) */ | |
127 | #define EXP_15 2037 /* 1/exp(5sec/15min) */ | |
128 | ||
129 | #define CALC_LOAD(load,exp,n) \ | |
130 | load *= exp; \ | |
131 | load += n*(FIXED_1-exp); \ | |
132 | load >>= FSHIFT; | |
133 | ||
134 | extern unsigned long total_forks; | |
135 | extern int nr_threads; | |
1da177e4 LT |
136 | DECLARE_PER_CPU(unsigned long, process_counts); |
137 | extern int nr_processes(void); | |
138 | extern unsigned long nr_running(void); | |
139 | extern unsigned long nr_uninterruptible(void); | |
140 | extern unsigned long nr_iowait(void); | |
8c215bd3 | 141 | extern unsigned long nr_iowait_cpu(int cpu); |
69d25870 AV |
142 | extern unsigned long this_cpu_load(void); |
143 | ||
144 | ||
0f004f5a | 145 | extern void calc_global_load(unsigned long ticks); |
1da177e4 | 146 | |
7e49fcce SR |
147 | extern unsigned long get_parent_ip(unsigned long addr); |
148 | ||
43ae34cb IM |
149 | struct seq_file; |
150 | struct cfs_rq; | |
4cf86d77 | 151 | struct task_group; |
43ae34cb IM |
152 | #ifdef CONFIG_SCHED_DEBUG |
153 | extern void proc_sched_show_task(struct task_struct *p, struct seq_file *m); | |
154 | extern void proc_sched_set_task(struct task_struct *p); | |
155 | extern void | |
5cef9eca | 156 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq); |
43ae34cb IM |
157 | #else |
158 | static inline void | |
159 | proc_sched_show_task(struct task_struct *p, struct seq_file *m) | |
160 | { | |
161 | } | |
162 | static inline void proc_sched_set_task(struct task_struct *p) | |
163 | { | |
164 | } | |
165 | static inline void | |
5cef9eca | 166 | print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) |
43ae34cb IM |
167 | { |
168 | } | |
169 | #endif | |
1da177e4 | 170 | |
4a8342d2 LT |
171 | /* |
172 | * Task state bitmask. NOTE! These bits are also | |
173 | * encoded in fs/proc/array.c: get_task_state(). | |
174 | * | |
175 | * We have two separate sets of flags: task->state | |
176 | * is about runnability, while task->exit_state are | |
177 | * about the task exiting. Confusing, but this way | |
178 | * modifying one set can't modify the other one by | |
179 | * mistake. | |
180 | */ | |
1da177e4 LT |
181 | #define TASK_RUNNING 0 |
182 | #define TASK_INTERRUPTIBLE 1 | |
183 | #define TASK_UNINTERRUPTIBLE 2 | |
f021a3c2 MW |
184 | #define __TASK_STOPPED 4 |
185 | #define __TASK_TRACED 8 | |
4a8342d2 LT |
186 | /* in tsk->exit_state */ |
187 | #define EXIT_ZOMBIE 16 | |
188 | #define EXIT_DEAD 32 | |
189 | /* in tsk->state again */ | |
af927232 | 190 | #define TASK_DEAD 64 |
f021a3c2 | 191 | #define TASK_WAKEKILL 128 |
e9c84311 | 192 | #define TASK_WAKING 256 |
e1781538 | 193 | #define TASK_STATE_MAX 512 |
f021a3c2 | 194 | |
44d90df6 | 195 | #define TASK_STATE_TO_CHAR_STR "RSDTtZXxKW" |
73342151 | 196 | |
e1781538 PZ |
197 | extern char ___assert_task_state[1 - 2*!!( |
198 | sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1)]; | |
f021a3c2 MW |
199 | |
200 | /* Convenience macros for the sake of set_task_state */ | |
201 | #define TASK_KILLABLE (TASK_WAKEKILL | TASK_UNINTERRUPTIBLE) | |
202 | #define TASK_STOPPED (TASK_WAKEKILL | __TASK_STOPPED) | |
203 | #define TASK_TRACED (TASK_WAKEKILL | __TASK_TRACED) | |
1da177e4 | 204 | |
92a1f4bc MW |
205 | /* Convenience macros for the sake of wake_up */ |
206 | #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE) | |
f021a3c2 | 207 | #define TASK_ALL (TASK_NORMAL | __TASK_STOPPED | __TASK_TRACED) |
92a1f4bc MW |
208 | |
209 | /* get_task_state() */ | |
210 | #define TASK_REPORT (TASK_RUNNING | TASK_INTERRUPTIBLE | \ | |
f021a3c2 MW |
211 | TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \ |
212 | __TASK_TRACED) | |
92a1f4bc | 213 | |
f021a3c2 MW |
214 | #define task_is_traced(task) ((task->state & __TASK_TRACED) != 0) |
215 | #define task_is_stopped(task) ((task->state & __TASK_STOPPED) != 0) | |
8f92054e | 216 | #define task_is_dead(task) ((task)->exit_state != 0) |
92a1f4bc | 217 | #define task_is_stopped_or_traced(task) \ |
f021a3c2 | 218 | ((task->state & (__TASK_STOPPED | __TASK_TRACED)) != 0) |
92a1f4bc | 219 | #define task_contributes_to_load(task) \ |
e3c8ca83 | 220 | ((task->state & TASK_UNINTERRUPTIBLE) != 0 && \ |
6301cb95 | 221 | (task->flags & PF_FREEZING) == 0) |
1da177e4 LT |
222 | |
223 | #define __set_task_state(tsk, state_value) \ | |
224 | do { (tsk)->state = (state_value); } while (0) | |
225 | #define set_task_state(tsk, state_value) \ | |
226 | set_mb((tsk)->state, (state_value)) | |
227 | ||
498d0c57 AM |
228 | /* |
229 | * set_current_state() includes a barrier so that the write of current->state | |
230 | * is correctly serialised wrt the caller's subsequent test of whether to | |
231 | * actually sleep: | |
232 | * | |
233 | * set_current_state(TASK_UNINTERRUPTIBLE); | |
234 | * if (do_i_need_to_sleep()) | |
235 | * schedule(); | |
236 | * | |
237 | * If the caller does not need such serialisation then use __set_current_state() | |
238 | */ | |
1da177e4 LT |
239 | #define __set_current_state(state_value) \ |
240 | do { current->state = (state_value); } while (0) | |
241 | #define set_current_state(state_value) \ | |
242 | set_mb(current->state, (state_value)) | |
243 | ||
244 | /* Task command name length */ | |
245 | #define TASK_COMM_LEN 16 | |
246 | ||
1da177e4 LT |
247 | #include <linux/spinlock.h> |
248 | ||
249 | /* | |
250 | * This serializes "schedule()" and also protects | |
251 | * the run-queue from deletions/modifications (but | |
252 | * _adding_ to the beginning of the run-queue has | |
253 | * a separate lock). | |
254 | */ | |
255 | extern rwlock_t tasklist_lock; | |
256 | extern spinlock_t mmlist_lock; | |
257 | ||
36c8b586 | 258 | struct task_struct; |
1da177e4 | 259 | |
db1466b3 PM |
260 | #ifdef CONFIG_PROVE_RCU |
261 | extern int lockdep_tasklist_lock_is_held(void); | |
262 | #endif /* #ifdef CONFIG_PROVE_RCU */ | |
263 | ||
1da177e4 LT |
264 | extern void sched_init(void); |
265 | extern void sched_init_smp(void); | |
2d07b255 | 266 | extern asmlinkage void schedule_tail(struct task_struct *prev); |
36c8b586 | 267 | extern void init_idle(struct task_struct *idle, int cpu); |
1df21055 | 268 | extern void init_idle_bootup_task(struct task_struct *idle); |
1da177e4 | 269 | |
89f19f04 | 270 | extern int runqueue_is_locked(int cpu); |
017730c1 | 271 | |
6a7b3dc3 | 272 | extern cpumask_var_t nohz_cpu_mask; |
46cb4b7c | 273 | #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ) |
83cd4fe2 VP |
274 | extern void select_nohz_load_balancer(int stop_tick); |
275 | extern int get_nohz_timer_target(void); | |
46cb4b7c | 276 | #else |
83cd4fe2 | 277 | static inline void select_nohz_load_balancer(int stop_tick) { } |
46cb4b7c | 278 | #endif |
1da177e4 | 279 | |
e59e2ae2 | 280 | /* |
39bc89fd | 281 | * Only dump TASK_* tasks. (0 for all tasks) |
e59e2ae2 IM |
282 | */ |
283 | extern void show_state_filter(unsigned long state_filter); | |
284 | ||
285 | static inline void show_state(void) | |
286 | { | |
39bc89fd | 287 | show_state_filter(0); |
e59e2ae2 IM |
288 | } |
289 | ||
1da177e4 LT |
290 | extern void show_regs(struct pt_regs *); |
291 | ||
292 | /* | |
293 | * TASK is a pointer to the task whose backtrace we want to see (or NULL for current | |
294 | * task), SP is the stack pointer of the first frame that should be shown in the back | |
295 | * trace (or NULL if the entire call-chain of the task should be shown). | |
296 | */ | |
297 | extern void show_stack(struct task_struct *task, unsigned long *sp); | |
298 | ||
299 | void io_schedule(void); | |
300 | long io_schedule_timeout(long timeout); | |
301 | ||
302 | extern void cpu_init (void); | |
303 | extern void trap_init(void); | |
304 | extern void update_process_times(int user); | |
305 | extern void scheduler_tick(void); | |
306 | ||
82a1fcb9 IM |
307 | extern void sched_show_task(struct task_struct *p); |
308 | ||
19cc36c0 | 309 | #ifdef CONFIG_LOCKUP_DETECTOR |
8446f1d3 | 310 | extern void touch_softlockup_watchdog(void); |
d6ad3e28 | 311 | extern void touch_softlockup_watchdog_sync(void); |
04c9167f | 312 | extern void touch_all_softlockup_watchdogs(void); |
332fbdbc DZ |
313 | extern int proc_dowatchdog_thresh(struct ctl_table *table, int write, |
314 | void __user *buffer, | |
315 | size_t *lenp, loff_t *ppos); | |
9c44bc03 | 316 | extern unsigned int softlockup_panic; |
9383d967 | 317 | extern int softlockup_thresh; |
004417a6 | 318 | void lockup_detector_init(void); |
8446f1d3 | 319 | #else |
8446f1d3 IM |
320 | static inline void touch_softlockup_watchdog(void) |
321 | { | |
322 | } | |
d6ad3e28 JW |
323 | static inline void touch_softlockup_watchdog_sync(void) |
324 | { | |
325 | } | |
04c9167f JF |
326 | static inline void touch_all_softlockup_watchdogs(void) |
327 | { | |
328 | } | |
004417a6 PZ |
329 | static inline void lockup_detector_init(void) |
330 | { | |
331 | } | |
8446f1d3 IM |
332 | #endif |
333 | ||
e162b39a MSB |
334 | #ifdef CONFIG_DETECT_HUNG_TASK |
335 | extern unsigned int sysctl_hung_task_panic; | |
336 | extern unsigned long sysctl_hung_task_check_count; | |
337 | extern unsigned long sysctl_hung_task_timeout_secs; | |
338 | extern unsigned long sysctl_hung_task_warnings; | |
339 | extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write, | |
8d65af78 | 340 | void __user *buffer, |
e162b39a | 341 | size_t *lenp, loff_t *ppos); |
e4ecda1b ML |
342 | #else |
343 | /* Avoid need for ifdefs elsewhere in the code */ | |
344 | enum { sysctl_hung_task_timeout_secs = 0 }; | |
e162b39a | 345 | #endif |
8446f1d3 | 346 | |
1da177e4 LT |
347 | /* Attach to any functions which should be ignored in wchan output. */ |
348 | #define __sched __attribute__((__section__(".sched.text"))) | |
deaf2227 IM |
349 | |
350 | /* Linker adds these: start and end of __sched functions */ | |
351 | extern char __sched_text_start[], __sched_text_end[]; | |
352 | ||
1da177e4 LT |
353 | /* Is this address in the __sched functions? */ |
354 | extern int in_sched_functions(unsigned long addr); | |
355 | ||
356 | #define MAX_SCHEDULE_TIMEOUT LONG_MAX | |
b3c97528 | 357 | extern signed long schedule_timeout(signed long timeout); |
64ed93a2 | 358 | extern signed long schedule_timeout_interruptible(signed long timeout); |
294d5cc2 | 359 | extern signed long schedule_timeout_killable(signed long timeout); |
64ed93a2 | 360 | extern signed long schedule_timeout_uninterruptible(signed long timeout); |
1da177e4 | 361 | asmlinkage void schedule(void); |
0d66bf6d | 362 | extern int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner); |
1da177e4 | 363 | |
ab516013 | 364 | struct nsproxy; |
acce292c | 365 | struct user_namespace; |
1da177e4 | 366 | |
341c87bf KH |
367 | /* |
368 | * Default maximum number of active map areas, this limits the number of vmas | |
369 | * per mm struct. Users can overwrite this number by sysctl but there is a | |
370 | * problem. | |
371 | * | |
372 | * When a program's coredump is generated as ELF format, a section is created | |
373 | * per a vma. In ELF, the number of sections is represented in unsigned short. | |
374 | * This means the number of sections should be smaller than 65535 at coredump. | |
375 | * Because the kernel adds some informative sections to a image of program at | |
376 | * generating coredump, we need some margin. The number of extra sections is | |
377 | * 1-3 now and depends on arch. We use "5" as safe margin, here. | |
378 | */ | |
379 | #define MAPCOUNT_ELF_CORE_MARGIN (5) | |
4be929be | 380 | #define DEFAULT_MAX_MAP_COUNT (USHRT_MAX - MAPCOUNT_ELF_CORE_MARGIN) |
1da177e4 LT |
381 | |
382 | extern int sysctl_max_map_count; | |
383 | ||
384 | #include <linux/aio.h> | |
385 | ||
efc1a3b1 DH |
386 | #ifdef CONFIG_MMU |
387 | extern void arch_pick_mmap_layout(struct mm_struct *mm); | |
1da177e4 LT |
388 | extern unsigned long |
389 | arch_get_unmapped_area(struct file *, unsigned long, unsigned long, | |
390 | unsigned long, unsigned long); | |
391 | extern unsigned long | |
392 | arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, | |
393 | unsigned long len, unsigned long pgoff, | |
394 | unsigned long flags); | |
1363c3cd WW |
395 | extern void arch_unmap_area(struct mm_struct *, unsigned long); |
396 | extern void arch_unmap_area_topdown(struct mm_struct *, unsigned long); | |
efc1a3b1 DH |
397 | #else |
398 | static inline void arch_pick_mmap_layout(struct mm_struct *mm) {} | |
399 | #endif | |
1da177e4 | 400 | |
901608d9 | 401 | |
6c5d5238 KH |
402 | extern void set_dumpable(struct mm_struct *mm, int value); |
403 | extern int get_dumpable(struct mm_struct *mm); | |
404 | ||
405 | /* mm flags */ | |
3cb4a0bb | 406 | /* dumpable bits */ |
6c5d5238 KH |
407 | #define MMF_DUMPABLE 0 /* core dump is permitted */ |
408 | #define MMF_DUMP_SECURELY 1 /* core file is readable only by root */ | |
f8af4da3 | 409 | |
3cb4a0bb | 410 | #define MMF_DUMPABLE_BITS 2 |
f8af4da3 | 411 | #define MMF_DUMPABLE_MASK ((1 << MMF_DUMPABLE_BITS) - 1) |
3cb4a0bb KH |
412 | |
413 | /* coredump filter bits */ | |
414 | #define MMF_DUMP_ANON_PRIVATE 2 | |
415 | #define MMF_DUMP_ANON_SHARED 3 | |
416 | #define MMF_DUMP_MAPPED_PRIVATE 4 | |
417 | #define MMF_DUMP_MAPPED_SHARED 5 | |
82df3973 | 418 | #define MMF_DUMP_ELF_HEADERS 6 |
e575f111 KM |
419 | #define MMF_DUMP_HUGETLB_PRIVATE 7 |
420 | #define MMF_DUMP_HUGETLB_SHARED 8 | |
f8af4da3 | 421 | |
3cb4a0bb | 422 | #define MMF_DUMP_FILTER_SHIFT MMF_DUMPABLE_BITS |
e575f111 | 423 | #define MMF_DUMP_FILTER_BITS 7 |
3cb4a0bb KH |
424 | #define MMF_DUMP_FILTER_MASK \ |
425 | (((1 << MMF_DUMP_FILTER_BITS) - 1) << MMF_DUMP_FILTER_SHIFT) | |
426 | #define MMF_DUMP_FILTER_DEFAULT \ | |
e575f111 | 427 | ((1 << MMF_DUMP_ANON_PRIVATE) | (1 << MMF_DUMP_ANON_SHARED) |\ |
656eb2cd RM |
428 | (1 << MMF_DUMP_HUGETLB_PRIVATE) | MMF_DUMP_MASK_DEFAULT_ELF) |
429 | ||
430 | #ifdef CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS | |
431 | # define MMF_DUMP_MASK_DEFAULT_ELF (1 << MMF_DUMP_ELF_HEADERS) | |
432 | #else | |
433 | # define MMF_DUMP_MASK_DEFAULT_ELF 0 | |
434 | #endif | |
f8af4da3 HD |
435 | /* leave room for more dump flags */ |
436 | #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ | |
ba76149f | 437 | #define MMF_VM_HUGEPAGE 17 /* set when VM_HUGEPAGE is set on vma */ |
f8af4da3 HD |
438 | |
439 | #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK) | |
6c5d5238 | 440 | |
1da177e4 LT |
441 | struct sighand_struct { |
442 | atomic_t count; | |
443 | struct k_sigaction action[_NSIG]; | |
444 | spinlock_t siglock; | |
b8fceee1 | 445 | wait_queue_head_t signalfd_wqh; |
1da177e4 LT |
446 | }; |
447 | ||
0e464814 | 448 | struct pacct_struct { |
f6ec29a4 KK |
449 | int ac_flag; |
450 | long ac_exitcode; | |
0e464814 | 451 | unsigned long ac_mem; |
77787bfb KK |
452 | cputime_t ac_utime, ac_stime; |
453 | unsigned long ac_minflt, ac_majflt; | |
0e464814 KK |
454 | }; |
455 | ||
42c4ab41 SG |
456 | struct cpu_itimer { |
457 | cputime_t expires; | |
458 | cputime_t incr; | |
8356b5f9 SG |
459 | u32 error; |
460 | u32 incr_error; | |
42c4ab41 SG |
461 | }; |
462 | ||
f06febc9 FM |
463 | /** |
464 | * struct task_cputime - collected CPU time counts | |
465 | * @utime: time spent in user mode, in &cputime_t units | |
466 | * @stime: time spent in kernel mode, in &cputime_t units | |
467 | * @sum_exec_runtime: total time spent on the CPU, in nanoseconds | |
5ce73a4a | 468 | * |
f06febc9 FM |
469 | * This structure groups together three kinds of CPU time that are |
470 | * tracked for threads and thread groups. Most things considering | |
471 | * CPU time want to group these counts together and treat all three | |
472 | * of them in parallel. | |
473 | */ | |
474 | struct task_cputime { | |
475 | cputime_t utime; | |
476 | cputime_t stime; | |
477 | unsigned long long sum_exec_runtime; | |
478 | }; | |
479 | /* Alternate field names when used to cache expirations. */ | |
480 | #define prof_exp stime | |
481 | #define virt_exp utime | |
482 | #define sched_exp sum_exec_runtime | |
483 | ||
4cd4c1b4 PZ |
484 | #define INIT_CPUTIME \ |
485 | (struct task_cputime) { \ | |
486 | .utime = cputime_zero, \ | |
487 | .stime = cputime_zero, \ | |
488 | .sum_exec_runtime = 0, \ | |
489 | } | |
490 | ||
c99e6efe PZ |
491 | /* |
492 | * Disable preemption until the scheduler is running. | |
493 | * Reset by start_kernel()->sched_init()->init_idle(). | |
d86ee480 PZ |
494 | * |
495 | * We include PREEMPT_ACTIVE to avoid cond_resched() from working | |
496 | * before the scheduler is active -- see should_resched(). | |
c99e6efe | 497 | */ |
d86ee480 | 498 | #define INIT_PREEMPT_COUNT (1 + PREEMPT_ACTIVE) |
c99e6efe | 499 | |
f06febc9 | 500 | /** |
4cd4c1b4 PZ |
501 | * struct thread_group_cputimer - thread group interval timer counts |
502 | * @cputime: thread group interval timers. | |
503 | * @running: non-zero when there are timers running and | |
504 | * @cputime receives updates. | |
505 | * @lock: lock for fields in this struct. | |
f06febc9 FM |
506 | * |
507 | * This structure contains the version of task_cputime, above, that is | |
4cd4c1b4 | 508 | * used for thread group CPU timer calculations. |
f06febc9 | 509 | */ |
4cd4c1b4 PZ |
510 | struct thread_group_cputimer { |
511 | struct task_cputime cputime; | |
512 | int running; | |
513 | spinlock_t lock; | |
f06febc9 | 514 | }; |
f06febc9 | 515 | |
5091faa4 MG |
516 | struct autogroup; |
517 | ||
1da177e4 LT |
518 | /* |
519 | * NOTE! "signal_struct" does not have it's own | |
520 | * locking, because a shared signal_struct always | |
521 | * implies a shared sighand_struct, so locking | |
522 | * sighand_struct is always a proper superset of | |
523 | * the locking of signal_struct. | |
524 | */ | |
525 | struct signal_struct { | |
ea6d290c | 526 | atomic_t sigcnt; |
1da177e4 | 527 | atomic_t live; |
b3ac022c | 528 | int nr_threads; |
1da177e4 LT |
529 | |
530 | wait_queue_head_t wait_chldexit; /* for wait4() */ | |
531 | ||
532 | /* current thread group signal load-balancing target: */ | |
36c8b586 | 533 | struct task_struct *curr_target; |
1da177e4 LT |
534 | |
535 | /* shared signal handling: */ | |
536 | struct sigpending shared_pending; | |
537 | ||
538 | /* thread group exit support */ | |
539 | int group_exit_code; | |
540 | /* overloaded: | |
541 | * - notify group_exit_task when ->count is equal to notify_count | |
542 | * - everyone except group_exit_task is stopped during signal delivery | |
543 | * of fatal signals, group_exit_task processes the signal. | |
544 | */ | |
1da177e4 | 545 | int notify_count; |
07dd20e0 | 546 | struct task_struct *group_exit_task; |
1da177e4 LT |
547 | |
548 | /* thread group stop support, overloads group_exit_code too */ | |
549 | int group_stop_count; | |
550 | unsigned int flags; /* see SIGNAL_* flags below */ | |
551 | ||
552 | /* POSIX.1b Interval Timers */ | |
553 | struct list_head posix_timers; | |
554 | ||
555 | /* ITIMER_REAL timer for the process */ | |
2ff678b8 | 556 | struct hrtimer real_timer; |
fea9d175 | 557 | struct pid *leader_pid; |
2ff678b8 | 558 | ktime_t it_real_incr; |
1da177e4 | 559 | |
42c4ab41 SG |
560 | /* |
561 | * ITIMER_PROF and ITIMER_VIRTUAL timers for the process, we use | |
562 | * CPUCLOCK_PROF and CPUCLOCK_VIRT for indexing array as these | |
563 | * values are defined to 0 and 1 respectively | |
564 | */ | |
565 | struct cpu_itimer it[2]; | |
1da177e4 | 566 | |
f06febc9 | 567 | /* |
4cd4c1b4 PZ |
568 | * Thread group totals for process CPU timers. |
569 | * See thread_group_cputimer(), et al, for details. | |
f06febc9 | 570 | */ |
4cd4c1b4 | 571 | struct thread_group_cputimer cputimer; |
f06febc9 FM |
572 | |
573 | /* Earliest-expiration cache. */ | |
574 | struct task_cputime cputime_expires; | |
575 | ||
576 | struct list_head cpu_timers[3]; | |
577 | ||
ab521dc0 | 578 | struct pid *tty_old_pgrp; |
1ec320af | 579 | |
1da177e4 LT |
580 | /* boolean value for session group leader */ |
581 | int leader; | |
582 | ||
583 | struct tty_struct *tty; /* NULL if no tty */ | |
584 | ||
5091faa4 MG |
585 | #ifdef CONFIG_SCHED_AUTOGROUP |
586 | struct autogroup *autogroup; | |
587 | #endif | |
1da177e4 LT |
588 | /* |
589 | * Cumulative resource counters for dead threads in the group, | |
590 | * and for reaped dead child processes forked by this group. | |
591 | * Live threads maintain their own counters and add to these | |
592 | * in __exit_signal, except for the group leader. | |
593 | */ | |
32bd671d | 594 | cputime_t utime, stime, cutime, cstime; |
9ac52315 LV |
595 | cputime_t gtime; |
596 | cputime_t cgtime; | |
0cf55e1e HS |
597 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
598 | cputime_t prev_utime, prev_stime; | |
599 | #endif | |
1da177e4 LT |
600 | unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; |
601 | unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; | |
6eaeeaba | 602 | unsigned long inblock, oublock, cinblock, coublock; |
1f10206c | 603 | unsigned long maxrss, cmaxrss; |
940389b8 | 604 | struct task_io_accounting ioac; |
1da177e4 | 605 | |
32bd671d PZ |
606 | /* |
607 | * Cumulative ns of schedule CPU time fo dead threads in the | |
608 | * group, not including a zombie group leader, (This only differs | |
609 | * from jiffies_to_ns(utime + stime) if sched_clock uses something | |
610 | * other than jiffies.) | |
611 | */ | |
612 | unsigned long long sum_sched_runtime; | |
613 | ||
1da177e4 LT |
614 | /* |
615 | * We don't bother to synchronize most readers of this at all, | |
616 | * because there is no reader checking a limit that actually needs | |
617 | * to get both rlim_cur and rlim_max atomically, and either one | |
618 | * alone is a single word that can safely be read normally. | |
619 | * getrlimit/setrlimit use task_lock(current->group_leader) to | |
620 | * protect this instead of the siglock, because they really | |
621 | * have no need to disable irqs. | |
622 | */ | |
623 | struct rlimit rlim[RLIM_NLIMITS]; | |
624 | ||
0e464814 KK |
625 | #ifdef CONFIG_BSD_PROCESS_ACCT |
626 | struct pacct_struct pacct; /* per-process accounting information */ | |
627 | #endif | |
ad4ecbcb | 628 | #ifdef CONFIG_TASKSTATS |
ad4ecbcb SN |
629 | struct taskstats *stats; |
630 | #endif | |
522ed776 MT |
631 | #ifdef CONFIG_AUDIT |
632 | unsigned audit_tty; | |
633 | struct tty_audit_buf *tty_audit_buf; | |
634 | #endif | |
28b83c51 | 635 | |
a63d83f4 DR |
636 | int oom_adj; /* OOM kill score adjustment (bit shift) */ |
637 | int oom_score_adj; /* OOM kill score adjustment */ | |
dabb16f6 MSB |
638 | int oom_score_adj_min; /* OOM kill score adjustment minimum value. |
639 | * Only settable by CAP_SYS_RESOURCE. */ | |
9b1bf12d KM |
640 | |
641 | struct mutex cred_guard_mutex; /* guard against foreign influences on | |
642 | * credential calculations | |
643 | * (notably. ptrace) */ | |
1da177e4 LT |
644 | }; |
645 | ||
4866cde0 NP |
646 | /* Context switch must be unlocked if interrupts are to be enabled */ |
647 | #ifdef __ARCH_WANT_INTERRUPTS_ON_CTXSW | |
648 | # define __ARCH_WANT_UNLOCKED_CTXSW | |
649 | #endif | |
650 | ||
1da177e4 LT |
651 | /* |
652 | * Bits in flags field of signal_struct. | |
653 | */ | |
654 | #define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */ | |
655 | #define SIGNAL_STOP_DEQUEUED 0x00000002 /* stop signal dequeued */ | |
656 | #define SIGNAL_STOP_CONTINUED 0x00000004 /* SIGCONT since WCONTINUED reap */ | |
657 | #define SIGNAL_GROUP_EXIT 0x00000008 /* group exit in progress */ | |
e4420551 ON |
658 | /* |
659 | * Pending notifications to parent. | |
660 | */ | |
661 | #define SIGNAL_CLD_STOPPED 0x00000010 | |
662 | #define SIGNAL_CLD_CONTINUED 0x00000020 | |
663 | #define SIGNAL_CLD_MASK (SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED) | |
1da177e4 | 664 | |
fae5fa44 ON |
665 | #define SIGNAL_UNKILLABLE 0x00000040 /* for init: ignore fatal signals */ |
666 | ||
ed5d2cac ON |
667 | /* If true, all threads except ->group_exit_task have pending SIGKILL */ |
668 | static inline int signal_group_exit(const struct signal_struct *sig) | |
669 | { | |
670 | return (sig->flags & SIGNAL_GROUP_EXIT) || | |
671 | (sig->group_exit_task != NULL); | |
672 | } | |
673 | ||
1da177e4 LT |
674 | /* |
675 | * Some day this will be a full-fledged user tracking system.. | |
676 | */ | |
677 | struct user_struct { | |
678 | atomic_t __count; /* reference count */ | |
679 | atomic_t processes; /* How many processes does this user have? */ | |
680 | atomic_t files; /* How many open files does this user have? */ | |
681 | atomic_t sigpending; /* How many pending signals does this user have? */ | |
2d9048e2 | 682 | #ifdef CONFIG_INOTIFY_USER |
0eeca283 RL |
683 | atomic_t inotify_watches; /* How many inotify watches does this user have? */ |
684 | atomic_t inotify_devs; /* How many inotify devs does this user have opened? */ | |
685 | #endif | |
4afeff85 EP |
686 | #ifdef CONFIG_FANOTIFY |
687 | atomic_t fanotify_listeners; | |
688 | #endif | |
7ef9964e | 689 | #ifdef CONFIG_EPOLL |
52bd19f7 | 690 | atomic_long_t epoll_watches; /* The number of file descriptors currently watched */ |
7ef9964e | 691 | #endif |
970a8645 | 692 | #ifdef CONFIG_POSIX_MQUEUE |
1da177e4 LT |
693 | /* protected by mq_lock */ |
694 | unsigned long mq_bytes; /* How many bytes can be allocated to mqueue? */ | |
970a8645 | 695 | #endif |
1da177e4 LT |
696 | unsigned long locked_shm; /* How many pages of mlocked shm ? */ |
697 | ||
698 | #ifdef CONFIG_KEYS | |
699 | struct key *uid_keyring; /* UID specific keyring */ | |
700 | struct key *session_keyring; /* UID's default session keyring */ | |
701 | #endif | |
702 | ||
703 | /* Hash table maintenance information */ | |
735de223 | 704 | struct hlist_node uidhash_node; |
1da177e4 | 705 | uid_t uid; |
18b6e041 | 706 | struct user_namespace *user_ns; |
24e377a8 | 707 | |
cdd6c482 | 708 | #ifdef CONFIG_PERF_EVENTS |
789f90fc PZ |
709 | atomic_long_t locked_vm; |
710 | #endif | |
1da177e4 LT |
711 | }; |
712 | ||
eb41d946 | 713 | extern int uids_sysfs_init(void); |
5cb350ba | 714 | |
1da177e4 LT |
715 | extern struct user_struct *find_user(uid_t); |
716 | ||
717 | extern struct user_struct root_user; | |
718 | #define INIT_USER (&root_user) | |
719 | ||
b6dff3ec | 720 | |
1da177e4 LT |
721 | struct backing_dev_info; |
722 | struct reclaim_state; | |
723 | ||
52f17b6c | 724 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
725 | struct sched_info { |
726 | /* cumulative counters */ | |
2d72376b | 727 | unsigned long pcount; /* # of times run on this cpu */ |
9c2c4802 | 728 | unsigned long long run_delay; /* time spent waiting on a runqueue */ |
1da177e4 LT |
729 | |
730 | /* timestamps */ | |
172ba844 BS |
731 | unsigned long long last_arrival,/* when we last ran on a cpu */ |
732 | last_queued; /* when we were last queued to run */ | |
b8efb561 IM |
733 | #ifdef CONFIG_SCHEDSTATS |
734 | /* BKL stats */ | |
480b9434 | 735 | unsigned int bkl_count; |
b8efb561 | 736 | #endif |
1da177e4 | 737 | }; |
52f17b6c | 738 | #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ |
1da177e4 | 739 | |
ca74e92b SN |
740 | #ifdef CONFIG_TASK_DELAY_ACCT |
741 | struct task_delay_info { | |
742 | spinlock_t lock; | |
743 | unsigned int flags; /* Private per-task flags */ | |
744 | ||
745 | /* For each stat XXX, add following, aligned appropriately | |
746 | * | |
747 | * struct timespec XXX_start, XXX_end; | |
748 | * u64 XXX_delay; | |
749 | * u32 XXX_count; | |
750 | * | |
751 | * Atomicity of updates to XXX_delay, XXX_count protected by | |
752 | * single lock above (split into XXX_lock if contention is an issue). | |
753 | */ | |
0ff92245 SN |
754 | |
755 | /* | |
756 | * XXX_count is incremented on every XXX operation, the delay | |
757 | * associated with the operation is added to XXX_delay. | |
758 | * XXX_delay contains the accumulated delay time in nanoseconds. | |
759 | */ | |
760 | struct timespec blkio_start, blkio_end; /* Shared by blkio, swapin */ | |
761 | u64 blkio_delay; /* wait for sync block io completion */ | |
762 | u64 swapin_delay; /* wait for swapin block io completion */ | |
763 | u32 blkio_count; /* total count of the number of sync block */ | |
764 | /* io operations performed */ | |
765 | u32 swapin_count; /* total count of the number of swapin block */ | |
766 | /* io operations performed */ | |
873b4771 KK |
767 | |
768 | struct timespec freepages_start, freepages_end; | |
769 | u64 freepages_delay; /* wait for memory reclaim */ | |
770 | u32 freepages_count; /* total count of memory reclaim */ | |
ca74e92b | 771 | }; |
52f17b6c CS |
772 | #endif /* CONFIG_TASK_DELAY_ACCT */ |
773 | ||
774 | static inline int sched_info_on(void) | |
775 | { | |
776 | #ifdef CONFIG_SCHEDSTATS | |
777 | return 1; | |
778 | #elif defined(CONFIG_TASK_DELAY_ACCT) | |
779 | extern int delayacct_on; | |
780 | return delayacct_on; | |
781 | #else | |
782 | return 0; | |
ca74e92b | 783 | #endif |
52f17b6c | 784 | } |
ca74e92b | 785 | |
d15bcfdb IM |
786 | enum cpu_idle_type { |
787 | CPU_IDLE, | |
788 | CPU_NOT_IDLE, | |
789 | CPU_NEWLY_IDLE, | |
790 | CPU_MAX_IDLE_TYPES | |
1da177e4 LT |
791 | }; |
792 | ||
793 | /* | |
794 | * sched-domains (multiprocessor balancing) declarations: | |
795 | */ | |
9aa7b369 IM |
796 | |
797 | /* | |
798 | * Increase resolution of nice-level calculations: | |
799 | */ | |
800 | #define SCHED_LOAD_SHIFT 10 | |
801 | #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) | |
802 | ||
f8700df7 | 803 | #define SCHED_LOAD_SCALE_FUZZ SCHED_LOAD_SCALE |
1da177e4 | 804 | |
2dd73a4f | 805 | #ifdef CONFIG_SMP |
b5d978e0 PZ |
806 | #define SD_LOAD_BALANCE 0x0001 /* Do load balancing on this domain. */ |
807 | #define SD_BALANCE_NEWIDLE 0x0002 /* Balance when about to become idle */ | |
808 | #define SD_BALANCE_EXEC 0x0004 /* Balance on exec */ | |
809 | #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ | |
c88d5910 | 810 | #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ |
b5d978e0 | 811 | #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ |
59abf026 | 812 | #define SD_PREFER_LOCAL 0x0040 /* Prefer to keep tasks local to this domain */ |
b5d978e0 PZ |
813 | #define SD_SHARE_CPUPOWER 0x0080 /* Domain members share cpu power */ |
814 | #define SD_POWERSAVINGS_BALANCE 0x0100 /* Balance for power savings */ | |
815 | #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ | |
816 | #define SD_SERIALIZE 0x0400 /* Only a single load balancing instance */ | |
532cb4c4 | 817 | #define SD_ASYM_PACKING 0x0800 /* Place busy groups earlier in the domain */ |
b5d978e0 | 818 | #define SD_PREFER_SIBLING 0x1000 /* Prefer to place tasks in a sibling domain */ |
5c45bf27 | 819 | |
afb8a9b7 GS |
820 | enum powersavings_balance_level { |
821 | POWERSAVINGS_BALANCE_NONE = 0, /* No power saving load balance */ | |
822 | POWERSAVINGS_BALANCE_BASIC, /* Fill one thread/core/package | |
823 | * first for long running threads | |
824 | */ | |
825 | POWERSAVINGS_BALANCE_WAKEUP, /* Also bias task wakeups to semi-idle | |
826 | * cpu package for power savings | |
827 | */ | |
828 | MAX_POWERSAVINGS_BALANCE_LEVELS | |
829 | }; | |
89c4710e | 830 | |
716707b2 | 831 | extern int sched_mc_power_savings, sched_smt_power_savings; |
89c4710e | 832 | |
716707b2 VS |
833 | static inline int sd_balance_for_mc_power(void) |
834 | { | |
835 | if (sched_smt_power_savings) | |
836 | return SD_POWERSAVINGS_BALANCE; | |
5c45bf27 | 837 | |
28f53181 VS |
838 | if (!sched_mc_power_savings) |
839 | return SD_PREFER_SIBLING; | |
840 | ||
841 | return 0; | |
716707b2 | 842 | } |
89c4710e | 843 | |
716707b2 VS |
844 | static inline int sd_balance_for_package_power(void) |
845 | { | |
846 | if (sched_mc_power_savings | sched_smt_power_savings) | |
847 | return SD_POWERSAVINGS_BALANCE; | |
848 | ||
b5d978e0 | 849 | return SD_PREFER_SIBLING; |
716707b2 | 850 | } |
5c45bf27 | 851 | |
532cb4c4 MN |
852 | extern int __weak arch_sd_sibiling_asym_packing(void); |
853 | ||
100fdaee VS |
854 | /* |
855 | * Optimise SD flags for power savings: | |
856 | * SD_BALANCE_NEWIDLE helps agressive task consolidation and power savings. | |
857 | * Keep default SD flags if sched_{smt,mc}_power_saving=0 | |
858 | */ | |
859 | ||
860 | static inline int sd_power_saving_flags(void) | |
861 | { | |
862 | if (sched_mc_power_savings | sched_smt_power_savings) | |
863 | return SD_BALANCE_NEWIDLE; | |
864 | ||
865 | return 0; | |
866 | } | |
1da177e4 LT |
867 | |
868 | struct sched_group { | |
869 | struct sched_group *next; /* Must be a circular list */ | |
1da177e4 LT |
870 | |
871 | /* | |
872 | * CPU power of this group, SCHED_LOAD_SCALE being max power for a | |
18a3885f | 873 | * single CPU. |
5517d86b | 874 | */ |
9d5efe05 | 875 | unsigned int cpu_power, cpu_power_orig; |
aae6d3dd | 876 | unsigned int group_weight; |
6c99e9ad | 877 | |
4200efd9 IM |
878 | /* |
879 | * The CPUs this group covers. | |
880 | * | |
881 | * NOTE: this field is variable length. (Allocated dynamically | |
882 | * by attaching extra space to the end of the structure, | |
883 | * depending on how many CPUs the kernel has booted up with) | |
884 | * | |
885 | * It is also be embedded into static data structures at build | |
886 | * time. (See 'struct static_sched_group' in kernel/sched.c) | |
887 | */ | |
888 | unsigned long cpumask[0]; | |
1da177e4 LT |
889 | }; |
890 | ||
758b2cdc RR |
891 | static inline struct cpumask *sched_group_cpus(struct sched_group *sg) |
892 | { | |
6c99e9ad | 893 | return to_cpumask(sg->cpumask); |
758b2cdc RR |
894 | } |
895 | ||
1d3504fc HS |
896 | enum sched_domain_level { |
897 | SD_LV_NONE = 0, | |
898 | SD_LV_SIBLING, | |
899 | SD_LV_MC, | |
01a08546 | 900 | SD_LV_BOOK, |
1d3504fc HS |
901 | SD_LV_CPU, |
902 | SD_LV_NODE, | |
903 | SD_LV_ALLNODES, | |
904 | SD_LV_MAX | |
905 | }; | |
906 | ||
907 | struct sched_domain_attr { | |
908 | int relax_domain_level; | |
909 | }; | |
910 | ||
911 | #define SD_ATTR_INIT (struct sched_domain_attr) { \ | |
912 | .relax_domain_level = -1, \ | |
913 | } | |
914 | ||
1da177e4 LT |
915 | struct sched_domain { |
916 | /* These fields must be setup */ | |
917 | struct sched_domain *parent; /* top domain must be null terminated */ | |
1a848870 | 918 | struct sched_domain *child; /* bottom domain must be null terminated */ |
1da177e4 | 919 | struct sched_group *groups; /* the balancing groups of the domain */ |
1da177e4 LT |
920 | unsigned long min_interval; /* Minimum balance interval ms */ |
921 | unsigned long max_interval; /* Maximum balance interval ms */ | |
922 | unsigned int busy_factor; /* less balancing by factor if busy */ | |
923 | unsigned int imbalance_pct; /* No balance until over watermark */ | |
1da177e4 | 924 | unsigned int cache_nice_tries; /* Leave cache hot tasks for # tries */ |
7897986b NP |
925 | unsigned int busy_idx; |
926 | unsigned int idle_idx; | |
927 | unsigned int newidle_idx; | |
928 | unsigned int wake_idx; | |
147cbb4b | 929 | unsigned int forkexec_idx; |
a52bfd73 | 930 | unsigned int smt_gain; |
1da177e4 | 931 | int flags; /* See SD_* */ |
1d3504fc | 932 | enum sched_domain_level level; |
1da177e4 LT |
933 | |
934 | /* Runtime fields. */ | |
935 | unsigned long last_balance; /* init to jiffies. units in jiffies */ | |
936 | unsigned int balance_interval; /* initialise to 1. units in ms. */ | |
937 | unsigned int nr_balance_failed; /* initialise to 0 */ | |
938 | ||
2398f2c6 PZ |
939 | u64 last_update; |
940 | ||
1da177e4 LT |
941 | #ifdef CONFIG_SCHEDSTATS |
942 | /* load_balance() stats */ | |
480b9434 KC |
943 | unsigned int lb_count[CPU_MAX_IDLE_TYPES]; |
944 | unsigned int lb_failed[CPU_MAX_IDLE_TYPES]; | |
945 | unsigned int lb_balanced[CPU_MAX_IDLE_TYPES]; | |
946 | unsigned int lb_imbalance[CPU_MAX_IDLE_TYPES]; | |
947 | unsigned int lb_gained[CPU_MAX_IDLE_TYPES]; | |
948 | unsigned int lb_hot_gained[CPU_MAX_IDLE_TYPES]; | |
949 | unsigned int lb_nobusyg[CPU_MAX_IDLE_TYPES]; | |
950 | unsigned int lb_nobusyq[CPU_MAX_IDLE_TYPES]; | |
1da177e4 LT |
951 | |
952 | /* Active load balancing */ | |
480b9434 KC |
953 | unsigned int alb_count; |
954 | unsigned int alb_failed; | |
955 | unsigned int alb_pushed; | |
1da177e4 | 956 | |
68767a0a | 957 | /* SD_BALANCE_EXEC stats */ |
480b9434 KC |
958 | unsigned int sbe_count; |
959 | unsigned int sbe_balanced; | |
960 | unsigned int sbe_pushed; | |
1da177e4 | 961 | |
68767a0a | 962 | /* SD_BALANCE_FORK stats */ |
480b9434 KC |
963 | unsigned int sbf_count; |
964 | unsigned int sbf_balanced; | |
965 | unsigned int sbf_pushed; | |
68767a0a | 966 | |
1da177e4 | 967 | /* try_to_wake_up() stats */ |
480b9434 KC |
968 | unsigned int ttwu_wake_remote; |
969 | unsigned int ttwu_move_affine; | |
970 | unsigned int ttwu_move_balance; | |
1da177e4 | 971 | #endif |
a5d8c348 IM |
972 | #ifdef CONFIG_SCHED_DEBUG |
973 | char *name; | |
974 | #endif | |
6c99e9ad | 975 | |
669c55e9 | 976 | unsigned int span_weight; |
4200efd9 IM |
977 | /* |
978 | * Span of all CPUs in this domain. | |
979 | * | |
980 | * NOTE: this field is variable length. (Allocated dynamically | |
981 | * by attaching extra space to the end of the structure, | |
982 | * depending on how many CPUs the kernel has booted up with) | |
983 | * | |
984 | * It is also be embedded into static data structures at build | |
985 | * time. (See 'struct static_sched_domain' in kernel/sched.c) | |
986 | */ | |
987 | unsigned long span[0]; | |
1da177e4 LT |
988 | }; |
989 | ||
758b2cdc RR |
990 | static inline struct cpumask *sched_domain_span(struct sched_domain *sd) |
991 | { | |
6c99e9ad | 992 | return to_cpumask(sd->span); |
758b2cdc RR |
993 | } |
994 | ||
acc3f5d7 | 995 | extern void partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1d3504fc | 996 | struct sched_domain_attr *dattr_new); |
029190c5 | 997 | |
acc3f5d7 RR |
998 | /* Allocate an array of sched domains, for partition_sched_domains(). */ |
999 | cpumask_var_t *alloc_sched_domains(unsigned int ndoms); | |
1000 | void free_sched_domains(cpumask_var_t doms[], unsigned int ndoms); | |
1001 | ||
06aaf76a IM |
1002 | /* Test a flag in parent sched domain */ |
1003 | static inline int test_sd_parent(struct sched_domain *sd, int flag) | |
1004 | { | |
1005 | if (sd->parent && (sd->parent->flags & flag)) | |
1006 | return 1; | |
1007 | ||
1008 | return 0; | |
1009 | } | |
029190c5 | 1010 | |
47fe38fc PZ |
1011 | unsigned long default_scale_freq_power(struct sched_domain *sd, int cpu); |
1012 | unsigned long default_scale_smt_power(struct sched_domain *sd, int cpu); | |
1013 | ||
1b427c15 | 1014 | #else /* CONFIG_SMP */ |
1da177e4 | 1015 | |
1b427c15 | 1016 | struct sched_domain_attr; |
d02c7a8c | 1017 | |
1b427c15 | 1018 | static inline void |
acc3f5d7 | 1019 | partition_sched_domains(int ndoms_new, cpumask_var_t doms_new[], |
1b427c15 IM |
1020 | struct sched_domain_attr *dattr_new) |
1021 | { | |
d02c7a8c | 1022 | } |
1b427c15 | 1023 | #endif /* !CONFIG_SMP */ |
1da177e4 | 1024 | |
47fe38fc | 1025 | |
1da177e4 | 1026 | struct io_context; /* See blkdev.h */ |
1da177e4 | 1027 | |
1da177e4 | 1028 | |
383f2835 | 1029 | #ifdef ARCH_HAS_PREFETCH_SWITCH_STACK |
36c8b586 | 1030 | extern void prefetch_stack(struct task_struct *t); |
383f2835 CK |
1031 | #else |
1032 | static inline void prefetch_stack(struct task_struct *t) { } | |
1033 | #endif | |
1da177e4 LT |
1034 | |
1035 | struct audit_context; /* See audit.c */ | |
1036 | struct mempolicy; | |
b92ce558 | 1037 | struct pipe_inode_info; |
4865ecf1 | 1038 | struct uts_namespace; |
1da177e4 | 1039 | |
20b8a59f IM |
1040 | struct rq; |
1041 | struct sched_domain; | |
1042 | ||
7d478721 PZ |
1043 | /* |
1044 | * wake flags | |
1045 | */ | |
1046 | #define WF_SYNC 0x01 /* waker goes to sleep after wakup */ | |
a7558e01 | 1047 | #define WF_FORK 0x02 /* child wakeup after fork */ |
7d478721 | 1048 | |
371fd7e7 PZ |
1049 | #define ENQUEUE_WAKEUP 1 |
1050 | #define ENQUEUE_WAKING 2 | |
1051 | #define ENQUEUE_HEAD 4 | |
1052 | ||
1053 | #define DEQUEUE_SLEEP 1 | |
1054 | ||
20b8a59f | 1055 | struct sched_class { |
5522d5d5 | 1056 | const struct sched_class *next; |
20b8a59f | 1057 | |
371fd7e7 PZ |
1058 | void (*enqueue_task) (struct rq *rq, struct task_struct *p, int flags); |
1059 | void (*dequeue_task) (struct rq *rq, struct task_struct *p, int flags); | |
4530d7ab | 1060 | void (*yield_task) (struct rq *rq); |
d95f4122 | 1061 | bool (*yield_to_task) (struct rq *rq, struct task_struct *p, bool preempt); |
20b8a59f | 1062 | |
7d478721 | 1063 | void (*check_preempt_curr) (struct rq *rq, struct task_struct *p, int flags); |
20b8a59f | 1064 | |
fb8d4724 | 1065 | struct task_struct * (*pick_next_task) (struct rq *rq); |
31ee529c | 1066 | void (*put_prev_task) (struct rq *rq, struct task_struct *p); |
20b8a59f | 1067 | |
681f3e68 | 1068 | #ifdef CONFIG_SMP |
0017d735 PZ |
1069 | int (*select_task_rq)(struct rq *rq, struct task_struct *p, |
1070 | int sd_flag, int flags); | |
4ce72a2c | 1071 | |
9a897c5a SR |
1072 | void (*pre_schedule) (struct rq *this_rq, struct task_struct *task); |
1073 | void (*post_schedule) (struct rq *this_rq); | |
efbbd05a PZ |
1074 | void (*task_waking) (struct rq *this_rq, struct task_struct *task); |
1075 | void (*task_woken) (struct rq *this_rq, struct task_struct *task); | |
e1d1484f | 1076 | |
cd8ba7cd | 1077 | void (*set_cpus_allowed)(struct task_struct *p, |
96f874e2 | 1078 | const struct cpumask *newmask); |
57d885fe | 1079 | |
1f11eb6a GH |
1080 | void (*rq_online)(struct rq *rq); |
1081 | void (*rq_offline)(struct rq *rq); | |
4ce72a2c LZ |
1082 | #endif |
1083 | ||
1084 | void (*set_curr_task) (struct rq *rq); | |
1085 | void (*task_tick) (struct rq *rq, struct task_struct *p, int queued); | |
cd29fe6f | 1086 | void (*task_fork) (struct task_struct *p); |
cb469845 | 1087 | |
da7a735e PZ |
1088 | void (*switched_from) (struct rq *this_rq, struct task_struct *task); |
1089 | void (*switched_to) (struct rq *this_rq, struct task_struct *task); | |
cb469845 | 1090 | void (*prio_changed) (struct rq *this_rq, struct task_struct *task, |
da7a735e | 1091 | int oldprio); |
810b3817 | 1092 | |
dba091b9 TG |
1093 | unsigned int (*get_rr_interval) (struct rq *rq, |
1094 | struct task_struct *task); | |
0d721cea | 1095 | |
810b3817 | 1096 | #ifdef CONFIG_FAIR_GROUP_SCHED |
b2b5ce02 | 1097 | void (*task_move_group) (struct task_struct *p, int on_rq); |
810b3817 | 1098 | #endif |
20b8a59f IM |
1099 | }; |
1100 | ||
1101 | struct load_weight { | |
1102 | unsigned long weight, inv_weight; | |
1103 | }; | |
1104 | ||
94c18227 | 1105 | #ifdef CONFIG_SCHEDSTATS |
41acab88 | 1106 | struct sched_statistics { |
20b8a59f | 1107 | u64 wait_start; |
94c18227 | 1108 | u64 wait_max; |
6d082592 AV |
1109 | u64 wait_count; |
1110 | u64 wait_sum; | |
8f0dfc34 AV |
1111 | u64 iowait_count; |
1112 | u64 iowait_sum; | |
94c18227 | 1113 | |
20b8a59f | 1114 | u64 sleep_start; |
20b8a59f | 1115 | u64 sleep_max; |
94c18227 IM |
1116 | s64 sum_sleep_runtime; |
1117 | ||
1118 | u64 block_start; | |
20b8a59f IM |
1119 | u64 block_max; |
1120 | u64 exec_max; | |
eba1ed4b | 1121 | u64 slice_max; |
cc367732 | 1122 | |
cc367732 IM |
1123 | u64 nr_migrations_cold; |
1124 | u64 nr_failed_migrations_affine; | |
1125 | u64 nr_failed_migrations_running; | |
1126 | u64 nr_failed_migrations_hot; | |
1127 | u64 nr_forced_migrations; | |
cc367732 IM |
1128 | |
1129 | u64 nr_wakeups; | |
1130 | u64 nr_wakeups_sync; | |
1131 | u64 nr_wakeups_migrate; | |
1132 | u64 nr_wakeups_local; | |
1133 | u64 nr_wakeups_remote; | |
1134 | u64 nr_wakeups_affine; | |
1135 | u64 nr_wakeups_affine_attempts; | |
1136 | u64 nr_wakeups_passive; | |
1137 | u64 nr_wakeups_idle; | |
41acab88 LDM |
1138 | }; |
1139 | #endif | |
1140 | ||
1141 | struct sched_entity { | |
1142 | struct load_weight load; /* for load-balancing */ | |
1143 | struct rb_node run_node; | |
1144 | struct list_head group_node; | |
1145 | unsigned int on_rq; | |
1146 | ||
1147 | u64 exec_start; | |
1148 | u64 sum_exec_runtime; | |
1149 | u64 vruntime; | |
1150 | u64 prev_sum_exec_runtime; | |
1151 | ||
41acab88 LDM |
1152 | u64 nr_migrations; |
1153 | ||
41acab88 LDM |
1154 | #ifdef CONFIG_SCHEDSTATS |
1155 | struct sched_statistics statistics; | |
94c18227 IM |
1156 | #endif |
1157 | ||
20b8a59f IM |
1158 | #ifdef CONFIG_FAIR_GROUP_SCHED |
1159 | struct sched_entity *parent; | |
1160 | /* rq on which this entity is (to be) queued: */ | |
1161 | struct cfs_rq *cfs_rq; | |
1162 | /* rq "owned" by this entity/group: */ | |
1163 | struct cfs_rq *my_q; | |
1164 | #endif | |
1165 | }; | |
70b97a7f | 1166 | |
fa717060 PZ |
1167 | struct sched_rt_entity { |
1168 | struct list_head run_list; | |
78f2c7db | 1169 | unsigned long timeout; |
bee367ed | 1170 | unsigned int time_slice; |
6f505b16 PZ |
1171 | int nr_cpus_allowed; |
1172 | ||
58d6c2d7 | 1173 | struct sched_rt_entity *back; |
052f1dc7 | 1174 | #ifdef CONFIG_RT_GROUP_SCHED |
6f505b16 PZ |
1175 | struct sched_rt_entity *parent; |
1176 | /* rq on which this entity is (to be) queued: */ | |
1177 | struct rt_rq *rt_rq; | |
1178 | /* rq "owned" by this entity/group: */ | |
1179 | struct rt_rq *my_q; | |
1180 | #endif | |
fa717060 PZ |
1181 | }; |
1182 | ||
86848966 PM |
1183 | struct rcu_node; |
1184 | ||
8dc85d54 PZ |
1185 | enum perf_event_task_context { |
1186 | perf_invalid_context = -1, | |
1187 | perf_hw_context = 0, | |
89a1e187 | 1188 | perf_sw_context, |
8dc85d54 PZ |
1189 | perf_nr_task_contexts, |
1190 | }; | |
1191 | ||
1da177e4 LT |
1192 | struct task_struct { |
1193 | volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ | |
f7e4217b | 1194 | void *stack; |
1da177e4 | 1195 | atomic_t usage; |
97dc32cd WC |
1196 | unsigned int flags; /* per process flags, defined below */ |
1197 | unsigned int ptrace; | |
1da177e4 | 1198 | |
36772092 | 1199 | int lock_depth; /* BKL lock depth */ |
1da177e4 | 1200 | |
2dd73a4f PW |
1201 | #ifdef CONFIG_SMP |
1202 | #ifdef __ARCH_WANT_UNLOCKED_CTXSW | |
4866cde0 NP |
1203 | int oncpu; |
1204 | #endif | |
2dd73a4f | 1205 | #endif |
50e645a8 | 1206 | |
b29739f9 | 1207 | int prio, static_prio, normal_prio; |
c7aceaba | 1208 | unsigned int rt_priority; |
5522d5d5 | 1209 | const struct sched_class *sched_class; |
20b8a59f | 1210 | struct sched_entity se; |
fa717060 | 1211 | struct sched_rt_entity rt; |
1da177e4 | 1212 | |
e107be36 AK |
1213 | #ifdef CONFIG_PREEMPT_NOTIFIERS |
1214 | /* list of struct preempt_notifier: */ | |
1215 | struct hlist_head preempt_notifiers; | |
1216 | #endif | |
1217 | ||
18796aa0 AD |
1218 | /* |
1219 | * fpu_counter contains the number of consecutive context switches | |
1220 | * that the FPU is used. If this is over a threshold, the lazy fpu | |
1221 | * saving becomes unlazy to save the trap. This is an unsigned char | |
1222 | * so that after 256 times the counter wraps and the behavior turns | |
1223 | * lazy again; this to deal with bursty apps that only use FPU for | |
1224 | * a short time | |
1225 | */ | |
1226 | unsigned char fpu_counter; | |
6c5c9341 | 1227 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 1228 | unsigned int btrace_seq; |
6c5c9341 | 1229 | #endif |
1da177e4 | 1230 | |
97dc32cd | 1231 | unsigned int policy; |
1da177e4 | 1232 | cpumask_t cpus_allowed; |
1da177e4 | 1233 | |
a57eb940 | 1234 | #ifdef CONFIG_PREEMPT_RCU |
e260be67 | 1235 | int rcu_read_lock_nesting; |
f41d911f | 1236 | char rcu_read_unlock_special; |
f41d911f | 1237 | struct list_head rcu_node_entry; |
a57eb940 PM |
1238 | #endif /* #ifdef CONFIG_PREEMPT_RCU */ |
1239 | #ifdef CONFIG_TREE_PREEMPT_RCU | |
1240 | struct rcu_node *rcu_blocked_node; | |
f41d911f | 1241 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
24278d14 PM |
1242 | #ifdef CONFIG_RCU_BOOST |
1243 | struct rt_mutex *rcu_boost_mutex; | |
1244 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
e260be67 | 1245 | |
52f17b6c | 1246 | #if defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) |
1da177e4 LT |
1247 | struct sched_info sched_info; |
1248 | #endif | |
1249 | ||
1250 | struct list_head tasks; | |
806c09a7 | 1251 | #ifdef CONFIG_SMP |
917b627d | 1252 | struct plist_node pushable_tasks; |
806c09a7 | 1253 | #endif |
1da177e4 LT |
1254 | |
1255 | struct mm_struct *mm, *active_mm; | |
34e55232 KH |
1256 | #if defined(SPLIT_RSS_COUNTING) |
1257 | struct task_rss_stat rss_stat; | |
1258 | #endif | |
1da177e4 | 1259 | /* task state */ |
97dc32cd | 1260 | int exit_state; |
1da177e4 LT |
1261 | int exit_code, exit_signal; |
1262 | int pdeath_signal; /* The signal sent when the parent dies */ | |
1263 | /* ??? */ | |
97dc32cd | 1264 | unsigned int personality; |
1da177e4 | 1265 | unsigned did_exec:1; |
f9ce1f1c KT |
1266 | unsigned in_execve:1; /* Tell the LSMs that the process is doing an |
1267 | * execve */ | |
8f0dfc34 AV |
1268 | unsigned in_iowait:1; |
1269 | ||
ca94c442 LP |
1270 | |
1271 | /* Revert to default priority/policy when forking */ | |
1272 | unsigned sched_reset_on_fork:1; | |
1273 | ||
1da177e4 LT |
1274 | pid_t pid; |
1275 | pid_t tgid; | |
0a425405 | 1276 | |
1314562a | 1277 | #ifdef CONFIG_CC_STACKPROTECTOR |
0a425405 AV |
1278 | /* Canary value for the -fstack-protector gcc feature */ |
1279 | unsigned long stack_canary; | |
1314562a | 1280 | #endif |
e0032087 | 1281 | |
1da177e4 LT |
1282 | /* |
1283 | * pointers to (original) parent process, youngest child, younger sibling, | |
1284 | * older sibling, respectively. (p->father can be replaced with | |
f470021a | 1285 | * p->real_parent->pid) |
1da177e4 | 1286 | */ |
f470021a RM |
1287 | struct task_struct *real_parent; /* real parent process */ |
1288 | struct task_struct *parent; /* recipient of SIGCHLD, wait4() reports */ | |
1da177e4 | 1289 | /* |
f470021a | 1290 | * children/sibling forms the list of my natural children |
1da177e4 LT |
1291 | */ |
1292 | struct list_head children; /* list of my children */ | |
1293 | struct list_head sibling; /* linkage in my parent's children list */ | |
1294 | struct task_struct *group_leader; /* threadgroup leader */ | |
1295 | ||
f470021a RM |
1296 | /* |
1297 | * ptraced is the list of tasks this task is using ptrace on. | |
1298 | * This includes both natural children and PTRACE_ATTACH targets. | |
1299 | * p->ptrace_entry is p's link on the p->parent->ptraced list. | |
1300 | */ | |
1301 | struct list_head ptraced; | |
1302 | struct list_head ptrace_entry; | |
1303 | ||
1da177e4 | 1304 | /* PID/PID hash table linkage. */ |
92476d7f | 1305 | struct pid_link pids[PIDTYPE_MAX]; |
47e65328 | 1306 | struct list_head thread_group; |
1da177e4 LT |
1307 | |
1308 | struct completion *vfork_done; /* for vfork() */ | |
1309 | int __user *set_child_tid; /* CLONE_CHILD_SETTID */ | |
1310 | int __user *clear_child_tid; /* CLONE_CHILD_CLEARTID */ | |
1311 | ||
c66f08be | 1312 | cputime_t utime, stime, utimescaled, stimescaled; |
9ac52315 | 1313 | cputime_t gtime; |
d99ca3b9 | 1314 | #ifndef CONFIG_VIRT_CPU_ACCOUNTING |
9301899b | 1315 | cputime_t prev_utime, prev_stime; |
d99ca3b9 | 1316 | #endif |
1da177e4 | 1317 | unsigned long nvcsw, nivcsw; /* context switch counts */ |
924b42d5 TJ |
1318 | struct timespec start_time; /* monotonic time */ |
1319 | struct timespec real_start_time; /* boot based time */ | |
1da177e4 LT |
1320 | /* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ |
1321 | unsigned long min_flt, maj_flt; | |
1322 | ||
f06febc9 | 1323 | struct task_cputime cputime_expires; |
1da177e4 LT |
1324 | struct list_head cpu_timers[3]; |
1325 | ||
1326 | /* process credentials */ | |
1b0ba1c9 | 1327 | const struct cred __rcu *real_cred; /* objective and real subjective task |
3b11a1de | 1328 | * credentials (COW) */ |
1b0ba1c9 | 1329 | const struct cred __rcu *cred; /* effective (overridable) subjective task |
3b11a1de | 1330 | * credentials (COW) */ |
ee18d64c | 1331 | struct cred *replacement_session_keyring; /* for KEYCTL_SESSION_TO_PARENT */ |
b6dff3ec | 1332 | |
36772092 PBG |
1333 | char comm[TASK_COMM_LEN]; /* executable name excluding path |
1334 | - access with [gs]et_task_comm (which lock | |
1335 | it with task_lock()) | |
221af7f8 | 1336 | - initialized normally by setup_new_exec */ |
1da177e4 LT |
1337 | /* file system info */ |
1338 | int link_count, total_link_count; | |
3d5b6fcc | 1339 | #ifdef CONFIG_SYSVIPC |
1da177e4 LT |
1340 | /* ipc stuff */ |
1341 | struct sysv_sem sysvsem; | |
3d5b6fcc | 1342 | #endif |
e162b39a | 1343 | #ifdef CONFIG_DETECT_HUNG_TASK |
82a1fcb9 | 1344 | /* hung task detection */ |
82a1fcb9 IM |
1345 | unsigned long last_switch_count; |
1346 | #endif | |
1da177e4 LT |
1347 | /* CPU-specific state of this task */ |
1348 | struct thread_struct thread; | |
1349 | /* filesystem information */ | |
1350 | struct fs_struct *fs; | |
1351 | /* open file information */ | |
1352 | struct files_struct *files; | |
1651e14e | 1353 | /* namespaces */ |
ab516013 | 1354 | struct nsproxy *nsproxy; |
1da177e4 LT |
1355 | /* signal handlers */ |
1356 | struct signal_struct *signal; | |
1357 | struct sighand_struct *sighand; | |
1358 | ||
1359 | sigset_t blocked, real_blocked; | |
f3de272b | 1360 | sigset_t saved_sigmask; /* restored if set_restore_sigmask() was used */ |
1da177e4 LT |
1361 | struct sigpending pending; |
1362 | ||
1363 | unsigned long sas_ss_sp; | |
1364 | size_t sas_ss_size; | |
1365 | int (*notifier)(void *priv); | |
1366 | void *notifier_data; | |
1367 | sigset_t *notifier_mask; | |
1da177e4 | 1368 | struct audit_context *audit_context; |
bfef93a5 AV |
1369 | #ifdef CONFIG_AUDITSYSCALL |
1370 | uid_t loginuid; | |
4746ec5b | 1371 | unsigned int sessionid; |
bfef93a5 | 1372 | #endif |
1da177e4 LT |
1373 | seccomp_t seccomp; |
1374 | ||
1375 | /* Thread group tracking */ | |
1376 | u32 parent_exec_id; | |
1377 | u32 self_exec_id; | |
58568d2a MX |
1378 | /* Protection of (de-)allocation: mm, files, fs, tty, keyrings, mems_allowed, |
1379 | * mempolicy */ | |
1da177e4 | 1380 | spinlock_t alloc_lock; |
1da177e4 | 1381 | |
3aa551c9 TG |
1382 | #ifdef CONFIG_GENERIC_HARDIRQS |
1383 | /* IRQ handler threads */ | |
1384 | struct irqaction *irqaction; | |
1385 | #endif | |
1386 | ||
b29739f9 | 1387 | /* Protection of the PI data structures: */ |
1d615482 | 1388 | raw_spinlock_t pi_lock; |
b29739f9 | 1389 | |
23f78d4a IM |
1390 | #ifdef CONFIG_RT_MUTEXES |
1391 | /* PI waiters blocked on a rt_mutex held by this task */ | |
1392 | struct plist_head pi_waiters; | |
1393 | /* Deadlock detection and priority inheritance handling */ | |
1394 | struct rt_mutex_waiter *pi_blocked_on; | |
23f78d4a IM |
1395 | #endif |
1396 | ||
408894ee IM |
1397 | #ifdef CONFIG_DEBUG_MUTEXES |
1398 | /* mutex deadlock detection */ | |
1399 | struct mutex_waiter *blocked_on; | |
1400 | #endif | |
de30a2b3 IM |
1401 | #ifdef CONFIG_TRACE_IRQFLAGS |
1402 | unsigned int irq_events; | |
de30a2b3 | 1403 | unsigned long hardirq_enable_ip; |
de30a2b3 | 1404 | unsigned long hardirq_disable_ip; |
fa1452e8 | 1405 | unsigned int hardirq_enable_event; |
de30a2b3 | 1406 | unsigned int hardirq_disable_event; |
fa1452e8 HS |
1407 | int hardirqs_enabled; |
1408 | int hardirq_context; | |
de30a2b3 | 1409 | unsigned long softirq_disable_ip; |
de30a2b3 | 1410 | unsigned long softirq_enable_ip; |
fa1452e8 | 1411 | unsigned int softirq_disable_event; |
de30a2b3 | 1412 | unsigned int softirq_enable_event; |
fa1452e8 | 1413 | int softirqs_enabled; |
de30a2b3 IM |
1414 | int softirq_context; |
1415 | #endif | |
fbb9ce95 | 1416 | #ifdef CONFIG_LOCKDEP |
bdb9441e | 1417 | # define MAX_LOCK_DEPTH 48UL |
fbb9ce95 IM |
1418 | u64 curr_chain_key; |
1419 | int lockdep_depth; | |
fbb9ce95 | 1420 | unsigned int lockdep_recursion; |
c7aceaba | 1421 | struct held_lock held_locks[MAX_LOCK_DEPTH]; |
cf40bd16 | 1422 | gfp_t lockdep_reclaim_gfp; |
fbb9ce95 | 1423 | #endif |
408894ee | 1424 | |
1da177e4 LT |
1425 | /* journalling filesystem info */ |
1426 | void *journal_info; | |
1427 | ||
d89d8796 | 1428 | /* stacked block device info */ |
bddd87c7 | 1429 | struct bio_list *bio_list; |
d89d8796 | 1430 | |
1da177e4 LT |
1431 | /* VM state */ |
1432 | struct reclaim_state *reclaim_state; | |
1433 | ||
1da177e4 LT |
1434 | struct backing_dev_info *backing_dev_info; |
1435 | ||
1436 | struct io_context *io_context; | |
1437 | ||
1438 | unsigned long ptrace_message; | |
1439 | siginfo_t *last_siginfo; /* For ptrace use. */ | |
7c3ab738 | 1440 | struct task_io_accounting ioac; |
8f0ab514 | 1441 | #if defined(CONFIG_TASK_XACCT) |
1da177e4 LT |
1442 | u64 acct_rss_mem1; /* accumulated rss usage */ |
1443 | u64 acct_vm_mem1; /* accumulated virtual memory usage */ | |
49b5cf34 | 1444 | cputime_t acct_timexpd; /* stime + utime since last update */ |
1da177e4 LT |
1445 | #endif |
1446 | #ifdef CONFIG_CPUSETS | |
58568d2a | 1447 | nodemask_t mems_allowed; /* Protected by alloc_lock */ |
c0ff7453 | 1448 | int mems_allowed_change_disable; |
825a46af | 1449 | int cpuset_mem_spread_rotor; |
6adef3eb | 1450 | int cpuset_slab_spread_rotor; |
1da177e4 | 1451 | #endif |
ddbcc7e8 | 1452 | #ifdef CONFIG_CGROUPS |
817929ec | 1453 | /* Control Group info protected by css_set_lock */ |
2c392b8c | 1454 | struct css_set __rcu *cgroups; |
817929ec PM |
1455 | /* cg_list protected by css_set_lock and tsk->alloc_lock */ |
1456 | struct list_head cg_list; | |
ddbcc7e8 | 1457 | #endif |
42b2dd0a | 1458 | #ifdef CONFIG_FUTEX |
0771dfef | 1459 | struct robust_list_head __user *robust_list; |
34f192c6 IM |
1460 | #ifdef CONFIG_COMPAT |
1461 | struct compat_robust_list_head __user *compat_robust_list; | |
1462 | #endif | |
c87e2837 IM |
1463 | struct list_head pi_state_list; |
1464 | struct futex_pi_state *pi_state_cache; | |
c7aceaba | 1465 | #endif |
cdd6c482 | 1466 | #ifdef CONFIG_PERF_EVENTS |
8dc85d54 | 1467 | struct perf_event_context *perf_event_ctxp[perf_nr_task_contexts]; |
cdd6c482 IM |
1468 | struct mutex perf_event_mutex; |
1469 | struct list_head perf_event_list; | |
a63eaf34 | 1470 | #endif |
c7aceaba | 1471 | #ifdef CONFIG_NUMA |
58568d2a | 1472 | struct mempolicy *mempolicy; /* Protected by alloc_lock */ |
c7aceaba | 1473 | short il_next; |
42b2dd0a | 1474 | #endif |
22e2c507 | 1475 | atomic_t fs_excl; /* holding fs exclusive resources */ |
e56d0903 | 1476 | struct rcu_head rcu; |
b92ce558 JA |
1477 | |
1478 | /* | |
1479 | * cache last used pipe for splice | |
1480 | */ | |
1481 | struct pipe_inode_info *splice_pipe; | |
ca74e92b SN |
1482 | #ifdef CONFIG_TASK_DELAY_ACCT |
1483 | struct task_delay_info *delays; | |
f4f154fd AM |
1484 | #endif |
1485 | #ifdef CONFIG_FAULT_INJECTION | |
1486 | int make_it_fail; | |
ca74e92b | 1487 | #endif |
3e26c149 | 1488 | struct prop_local_single dirties; |
9745512c AV |
1489 | #ifdef CONFIG_LATENCYTOP |
1490 | int latency_record_count; | |
1491 | struct latency_record latency_record[LT_SAVECOUNT]; | |
1492 | #endif | |
6976675d AV |
1493 | /* |
1494 | * time slack values; these are used to round up poll() and | |
1495 | * select() etc timeout values. These are in nanoseconds. | |
1496 | */ | |
1497 | unsigned long timer_slack_ns; | |
1498 | unsigned long default_timer_slack_ns; | |
f8d570a4 DM |
1499 | |
1500 | struct list_head *scm_work_list; | |
fb52607a | 1501 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER |
3ad2f3fb | 1502 | /* Index of current stored address in ret_stack */ |
f201ae23 FW |
1503 | int curr_ret_stack; |
1504 | /* Stack of return addresses for return function tracing */ | |
1505 | struct ftrace_ret_stack *ret_stack; | |
8aef2d28 SR |
1506 | /* time stamp for last schedule */ |
1507 | unsigned long long ftrace_timestamp; | |
f201ae23 FW |
1508 | /* |
1509 | * Number of functions that haven't been traced | |
1510 | * because of depth overrun. | |
1511 | */ | |
1512 | atomic_t trace_overrun; | |
380c4b14 FW |
1513 | /* Pause for the tracing */ |
1514 | atomic_t tracing_graph_pause; | |
f201ae23 | 1515 | #endif |
ea4e2bc4 SR |
1516 | #ifdef CONFIG_TRACING |
1517 | /* state flags for use by tracers */ | |
1518 | unsigned long trace; | |
261842b7 SR |
1519 | /* bitmask of trace recursion */ |
1520 | unsigned long trace_recursion; | |
1521 | #endif /* CONFIG_TRACING */ | |
569b846d KH |
1522 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */ |
1523 | struct memcg_batch_info { | |
1524 | int do_batch; /* incremented when batch uncharge started */ | |
1525 | struct mem_cgroup *memcg; /* target memcg of uncharge */ | |
1526 | unsigned long bytes; /* uncharged usage */ | |
1527 | unsigned long memsw_bytes; /* uncharged mem+swap usage */ | |
1528 | } memcg_batch; | |
1529 | #endif | |
1da177e4 LT |
1530 | }; |
1531 | ||
76e6eee0 | 1532 | /* Future-safe accessor for struct task_struct's cpus_allowed. */ |
a4636818 | 1533 | #define tsk_cpus_allowed(tsk) (&(tsk)->cpus_allowed) |
76e6eee0 | 1534 | |
e05606d3 IM |
1535 | /* |
1536 | * Priority of a process goes from 0..MAX_PRIO-1, valid RT | |
1537 | * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH | |
1538 | * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority | |
1539 | * values are inverted: lower p->prio value means higher priority. | |
1540 | * | |
1541 | * The MAX_USER_RT_PRIO value allows the actual maximum | |
1542 | * RT priority to be separate from the value exported to | |
1543 | * user-space. This allows kernel threads to set their | |
1544 | * priority to a value higher than any user task. Note: | |
1545 | * MAX_RT_PRIO must not be smaller than MAX_USER_RT_PRIO. | |
1546 | */ | |
1547 | ||
1548 | #define MAX_USER_RT_PRIO 100 | |
1549 | #define MAX_RT_PRIO MAX_USER_RT_PRIO | |
1550 | ||
1551 | #define MAX_PRIO (MAX_RT_PRIO + 40) | |
1552 | #define DEFAULT_PRIO (MAX_RT_PRIO + 20) | |
1553 | ||
1554 | static inline int rt_prio(int prio) | |
1555 | { | |
1556 | if (unlikely(prio < MAX_RT_PRIO)) | |
1557 | return 1; | |
1558 | return 0; | |
1559 | } | |
1560 | ||
e868171a | 1561 | static inline int rt_task(struct task_struct *p) |
e05606d3 IM |
1562 | { |
1563 | return rt_prio(p->prio); | |
1564 | } | |
1565 | ||
e868171a | 1566 | static inline struct pid *task_pid(struct task_struct *task) |
22c935f4 EB |
1567 | { |
1568 | return task->pids[PIDTYPE_PID].pid; | |
1569 | } | |
1570 | ||
e868171a | 1571 | static inline struct pid *task_tgid(struct task_struct *task) |
22c935f4 EB |
1572 | { |
1573 | return task->group_leader->pids[PIDTYPE_PID].pid; | |
1574 | } | |
1575 | ||
6dda81f4 ON |
1576 | /* |
1577 | * Without tasklist or rcu lock it is not safe to dereference | |
1578 | * the result of task_pgrp/task_session even if task == current, | |
1579 | * we can race with another thread doing sys_setsid/sys_setpgid. | |
1580 | */ | |
e868171a | 1581 | static inline struct pid *task_pgrp(struct task_struct *task) |
22c935f4 EB |
1582 | { |
1583 | return task->group_leader->pids[PIDTYPE_PGID].pid; | |
1584 | } | |
1585 | ||
e868171a | 1586 | static inline struct pid *task_session(struct task_struct *task) |
22c935f4 EB |
1587 | { |
1588 | return task->group_leader->pids[PIDTYPE_SID].pid; | |
1589 | } | |
1590 | ||
7af57294 PE |
1591 | struct pid_namespace; |
1592 | ||
1593 | /* | |
1594 | * the helpers to get the task's different pids as they are seen | |
1595 | * from various namespaces | |
1596 | * | |
1597 | * task_xid_nr() : global id, i.e. the id seen from the init namespace; | |
44c4e1b2 EB |
1598 | * task_xid_vnr() : virtual id, i.e. the id seen from the pid namespace of |
1599 | * current. | |
7af57294 PE |
1600 | * task_xid_nr_ns() : id seen from the ns specified; |
1601 | * | |
1602 | * set_task_vxid() : assigns a virtual id to a task; | |
1603 | * | |
7af57294 PE |
1604 | * see also pid_nr() etc in include/linux/pid.h |
1605 | */ | |
52ee2dfd ON |
1606 | pid_t __task_pid_nr_ns(struct task_struct *task, enum pid_type type, |
1607 | struct pid_namespace *ns); | |
7af57294 | 1608 | |
e868171a | 1609 | static inline pid_t task_pid_nr(struct task_struct *tsk) |
7af57294 PE |
1610 | { |
1611 | return tsk->pid; | |
1612 | } | |
1613 | ||
52ee2dfd ON |
1614 | static inline pid_t task_pid_nr_ns(struct task_struct *tsk, |
1615 | struct pid_namespace *ns) | |
1616 | { | |
1617 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, ns); | |
1618 | } | |
7af57294 PE |
1619 | |
1620 | static inline pid_t task_pid_vnr(struct task_struct *tsk) | |
1621 | { | |
52ee2dfd | 1622 | return __task_pid_nr_ns(tsk, PIDTYPE_PID, NULL); |
7af57294 PE |
1623 | } |
1624 | ||
1625 | ||
e868171a | 1626 | static inline pid_t task_tgid_nr(struct task_struct *tsk) |
7af57294 PE |
1627 | { |
1628 | return tsk->tgid; | |
1629 | } | |
1630 | ||
2f2a3a46 | 1631 | pid_t task_tgid_nr_ns(struct task_struct *tsk, struct pid_namespace *ns); |
7af57294 PE |
1632 | |
1633 | static inline pid_t task_tgid_vnr(struct task_struct *tsk) | |
1634 | { | |
1635 | return pid_vnr(task_tgid(tsk)); | |
1636 | } | |
1637 | ||
1638 | ||
52ee2dfd ON |
1639 | static inline pid_t task_pgrp_nr_ns(struct task_struct *tsk, |
1640 | struct pid_namespace *ns) | |
7af57294 | 1641 | { |
52ee2dfd | 1642 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, ns); |
7af57294 PE |
1643 | } |
1644 | ||
7af57294 PE |
1645 | static inline pid_t task_pgrp_vnr(struct task_struct *tsk) |
1646 | { | |
52ee2dfd | 1647 | return __task_pid_nr_ns(tsk, PIDTYPE_PGID, NULL); |
7af57294 PE |
1648 | } |
1649 | ||
1650 | ||
52ee2dfd ON |
1651 | static inline pid_t task_session_nr_ns(struct task_struct *tsk, |
1652 | struct pid_namespace *ns) | |
7af57294 | 1653 | { |
52ee2dfd | 1654 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, ns); |
7af57294 PE |
1655 | } |
1656 | ||
7af57294 PE |
1657 | static inline pid_t task_session_vnr(struct task_struct *tsk) |
1658 | { | |
52ee2dfd | 1659 | return __task_pid_nr_ns(tsk, PIDTYPE_SID, NULL); |
7af57294 PE |
1660 | } |
1661 | ||
1b0f7ffd ON |
1662 | /* obsolete, do not use */ |
1663 | static inline pid_t task_pgrp_nr(struct task_struct *tsk) | |
1664 | { | |
1665 | return task_pgrp_nr_ns(tsk, &init_pid_ns); | |
1666 | } | |
7af57294 | 1667 | |
1da177e4 LT |
1668 | /** |
1669 | * pid_alive - check that a task structure is not stale | |
1670 | * @p: Task structure to be checked. | |
1671 | * | |
1672 | * Test if a process is not yet dead (at most zombie state) | |
1673 | * If pid_alive fails, then pointers within the task structure | |
1674 | * can be stale and must not be dereferenced. | |
1675 | */ | |
e868171a | 1676 | static inline int pid_alive(struct task_struct *p) |
1da177e4 | 1677 | { |
92476d7f | 1678 | return p->pids[PIDTYPE_PID].pid != NULL; |
1da177e4 LT |
1679 | } |
1680 | ||
f400e198 | 1681 | /** |
b460cbc5 | 1682 | * is_global_init - check if a task structure is init |
3260259f H |
1683 | * @tsk: Task structure to be checked. |
1684 | * | |
1685 | * Check if a task structure is the first user space task the kernel created. | |
b460cbc5 | 1686 | */ |
e868171a | 1687 | static inline int is_global_init(struct task_struct *tsk) |
b461cc03 PE |
1688 | { |
1689 | return tsk->pid == 1; | |
1690 | } | |
b460cbc5 SH |
1691 | |
1692 | /* | |
1693 | * is_container_init: | |
1694 | * check whether in the task is init in its own pid namespace. | |
f400e198 | 1695 | */ |
b461cc03 | 1696 | extern int is_container_init(struct task_struct *tsk); |
f400e198 | 1697 | |
9ec52099 CLG |
1698 | extern struct pid *cad_pid; |
1699 | ||
1da177e4 | 1700 | extern void free_task(struct task_struct *tsk); |
1da177e4 | 1701 | #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0) |
e56d0903 | 1702 | |
158d9ebd | 1703 | extern void __put_task_struct(struct task_struct *t); |
e56d0903 IM |
1704 | |
1705 | static inline void put_task_struct(struct task_struct *t) | |
1706 | { | |
1707 | if (atomic_dec_and_test(&t->usage)) | |
8c7904a0 | 1708 | __put_task_struct(t); |
e56d0903 | 1709 | } |
1da177e4 | 1710 | |
d180c5bc | 1711 | extern void task_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
0cf55e1e | 1712 | extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *st); |
49048622 | 1713 | |
1da177e4 LT |
1714 | /* |
1715 | * Per process flags | |
1716 | */ | |
1da177e4 LT |
1717 | #define PF_STARTING 0x00000002 /* being created */ |
1718 | #define PF_EXITING 0x00000004 /* getting shut down */ | |
778e9a9c | 1719 | #define PF_EXITPIDONE 0x00000008 /* pi exit done on shut down */ |
94886b84 | 1720 | #define PF_VCPU 0x00000010 /* I'm a virtual CPU */ |
21aa9af0 | 1721 | #define PF_WQ_WORKER 0x00000020 /* I'm a workqueue worker */ |
1da177e4 | 1722 | #define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ |
4db96cf0 | 1723 | #define PF_MCE_PROCESS 0x00000080 /* process policy on mce errors */ |
1da177e4 LT |
1724 | #define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ |
1725 | #define PF_DUMPCORE 0x00000200 /* dumped core */ | |
1726 | #define PF_SIGNALED 0x00000400 /* killed by a signal */ | |
1727 | #define PF_MEMALLOC 0x00000800 /* Allocating memory */ | |
1da177e4 | 1728 | #define PF_USED_MATH 0x00002000 /* if unset the fpu must be initialized before use */ |
6301cb95 | 1729 | #define PF_FREEZING 0x00004000 /* freeze in progress. do not account to load */ |
1da177e4 LT |
1730 | #define PF_NOFREEZE 0x00008000 /* this thread should not be frozen */ |
1731 | #define PF_FROZEN 0x00010000 /* frozen for system suspend */ | |
1732 | #define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */ | |
1733 | #define PF_KSWAPD 0x00040000 /* I am kswapd */ | |
35451bee | 1734 | #define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */ |
1da177e4 | 1735 | #define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */ |
246bb0b1 | 1736 | #define PF_KTHREAD 0x00200000 /* I am a kernel thread */ |
b31dc66a JA |
1737 | #define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */ |
1738 | #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */ | |
1739 | #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */ | |
1740 | #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */ | |
9985b0ba | 1741 | #define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */ |
4db96cf0 | 1742 | #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */ |
c61afb18 | 1743 | #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */ |
61a87122 | 1744 | #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */ |
58a69cb4 | 1745 | #define PF_FREEZER_SKIP 0x40000000 /* Freezer should not count it as freezable */ |
ebb12db5 | 1746 | #define PF_FREEZER_NOSIG 0x80000000 /* Freezer won't send signals to it */ |
1da177e4 LT |
1747 | |
1748 | /* | |
1749 | * Only the _current_ task can read/write to tsk->flags, but other | |
1750 | * tasks can access tsk->flags in readonly mode for example | |
1751 | * with tsk_used_math (like during threaded core dumping). | |
1752 | * There is however an exception to this rule during ptrace | |
1753 | * or during fork: the ptracer task is allowed to write to the | |
1754 | * child->flags of its traced child (same goes for fork, the parent | |
1755 | * can write to the child->flags), because we're guaranteed the | |
1756 | * child is not running and in turn not changing child->flags | |
1757 | * at the same time the parent does it. | |
1758 | */ | |
1759 | #define clear_stopped_child_used_math(child) do { (child)->flags &= ~PF_USED_MATH; } while (0) | |
1760 | #define set_stopped_child_used_math(child) do { (child)->flags |= PF_USED_MATH; } while (0) | |
1761 | #define clear_used_math() clear_stopped_child_used_math(current) | |
1762 | #define set_used_math() set_stopped_child_used_math(current) | |
1763 | #define conditional_stopped_child_used_math(condition, child) \ | |
1764 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= (condition) ? PF_USED_MATH : 0; } while (0) | |
1765 | #define conditional_used_math(condition) \ | |
1766 | conditional_stopped_child_used_math(condition, current) | |
1767 | #define copy_to_stopped_child_used_math(child) \ | |
1768 | do { (child)->flags &= ~PF_USED_MATH, (child)->flags |= current->flags & PF_USED_MATH; } while (0) | |
1769 | /* NOTE: this will return 0 or PF_USED_MATH, it will never return 1 */ | |
1770 | #define tsk_used_math(p) ((p)->flags & PF_USED_MATH) | |
1771 | #define used_math() tsk_used_math(current) | |
1772 | ||
a57eb940 | 1773 | #ifdef CONFIG_PREEMPT_RCU |
f41d911f PM |
1774 | |
1775 | #define RCU_READ_UNLOCK_BLOCKED (1 << 0) /* blocked while in RCU read-side. */ | |
24278d14 PM |
1776 | #define RCU_READ_UNLOCK_BOOSTED (1 << 1) /* boosted while in RCU read-side. */ |
1777 | #define RCU_READ_UNLOCK_NEED_QS (1 << 2) /* RCU core needs CPU response. */ | |
f41d911f PM |
1778 | |
1779 | static inline void rcu_copy_process(struct task_struct *p) | |
1780 | { | |
1781 | p->rcu_read_lock_nesting = 0; | |
1782 | p->rcu_read_unlock_special = 0; | |
a57eb940 | 1783 | #ifdef CONFIG_TREE_PREEMPT_RCU |
dd5d19ba | 1784 | p->rcu_blocked_node = NULL; |
24278d14 PM |
1785 | #endif /* #ifdef CONFIG_TREE_PREEMPT_RCU */ |
1786 | #ifdef CONFIG_RCU_BOOST | |
1787 | p->rcu_boost_mutex = NULL; | |
1788 | #endif /* #ifdef CONFIG_RCU_BOOST */ | |
f41d911f PM |
1789 | INIT_LIST_HEAD(&p->rcu_node_entry); |
1790 | } | |
1791 | ||
f41d911f PM |
1792 | #else |
1793 | ||
1794 | static inline void rcu_copy_process(struct task_struct *p) | |
1795 | { | |
1796 | } | |
1797 | ||
1798 | #endif | |
1799 | ||
1da177e4 | 1800 | #ifdef CONFIG_SMP |
cd8ba7cd | 1801 | extern int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1802 | const struct cpumask *new_mask); |
1da177e4 | 1803 | #else |
cd8ba7cd | 1804 | static inline int set_cpus_allowed_ptr(struct task_struct *p, |
96f874e2 | 1805 | const struct cpumask *new_mask) |
1da177e4 | 1806 | { |
96f874e2 | 1807 | if (!cpumask_test_cpu(0, new_mask)) |
1da177e4 LT |
1808 | return -EINVAL; |
1809 | return 0; | |
1810 | } | |
1811 | #endif | |
e0ad9556 RR |
1812 | |
1813 | #ifndef CONFIG_CPUMASK_OFFSTACK | |
cd8ba7cd MT |
1814 | static inline int set_cpus_allowed(struct task_struct *p, cpumask_t new_mask) |
1815 | { | |
1816 | return set_cpus_allowed_ptr(p, &new_mask); | |
1817 | } | |
e0ad9556 | 1818 | #endif |
1da177e4 | 1819 | |
b342501c | 1820 | /* |
c676329a PZ |
1821 | * Do not use outside of architecture code which knows its limitations. |
1822 | * | |
1823 | * sched_clock() has no promise of monotonicity or bounded drift between | |
1824 | * CPUs, use (which you should not) requires disabling IRQs. | |
1825 | * | |
1826 | * Please use one of the three interfaces below. | |
b342501c | 1827 | */ |
1bbfa6f2 | 1828 | extern unsigned long long notrace sched_clock(void); |
c676329a PZ |
1829 | /* |
1830 | * See the comment in kernel/sched_clock.c | |
1831 | */ | |
1832 | extern u64 cpu_clock(int cpu); | |
1833 | extern u64 local_clock(void); | |
1834 | extern u64 sched_clock_cpu(int cpu); | |
1835 | ||
e436d800 | 1836 | |
c1955a3d | 1837 | extern void sched_clock_init(void); |
3e51f33f | 1838 | |
c1955a3d | 1839 | #ifndef CONFIG_HAVE_UNSTABLE_SCHED_CLOCK |
3e51f33f PZ |
1840 | static inline void sched_clock_tick(void) |
1841 | { | |
1842 | } | |
1843 | ||
1844 | static inline void sched_clock_idle_sleep_event(void) | |
1845 | { | |
1846 | } | |
1847 | ||
1848 | static inline void sched_clock_idle_wakeup_event(u64 delta_ns) | |
1849 | { | |
1850 | } | |
1851 | #else | |
c676329a PZ |
1852 | /* |
1853 | * Architectures can set this to 1 if they have specified | |
1854 | * CONFIG_HAVE_UNSTABLE_SCHED_CLOCK in their arch Kconfig, | |
1855 | * but then during bootup it turns out that sched_clock() | |
1856 | * is reliable after all: | |
1857 | */ | |
1858 | extern int sched_clock_stable; | |
1859 | ||
3e51f33f PZ |
1860 | extern void sched_clock_tick(void); |
1861 | extern void sched_clock_idle_sleep_event(void); | |
1862 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
1863 | #endif | |
1864 | ||
b52bfee4 VP |
1865 | #ifdef CONFIG_IRQ_TIME_ACCOUNTING |
1866 | /* | |
1867 | * An i/f to runtime opt-in for irq time accounting based off of sched_clock. | |
1868 | * The reason for this explicit opt-in is not to have perf penalty with | |
1869 | * slow sched_clocks. | |
1870 | */ | |
1871 | extern void enable_sched_clock_irqtime(void); | |
1872 | extern void disable_sched_clock_irqtime(void); | |
1873 | #else | |
1874 | static inline void enable_sched_clock_irqtime(void) {} | |
1875 | static inline void disable_sched_clock_irqtime(void) {} | |
1876 | #endif | |
1877 | ||
36c8b586 | 1878 | extern unsigned long long |
41b86e9c | 1879 | task_sched_runtime(struct task_struct *task); |
f06febc9 | 1880 | extern unsigned long long thread_group_sched_runtime(struct task_struct *task); |
1da177e4 LT |
1881 | |
1882 | /* sched_exec is called by processes performing an exec */ | |
1883 | #ifdef CONFIG_SMP | |
1884 | extern void sched_exec(void); | |
1885 | #else | |
1886 | #define sched_exec() {} | |
1887 | #endif | |
1888 | ||
2aa44d05 IM |
1889 | extern void sched_clock_idle_sleep_event(void); |
1890 | extern void sched_clock_idle_wakeup_event(u64 delta_ns); | |
bb29ab26 | 1891 | |
1da177e4 LT |
1892 | #ifdef CONFIG_HOTPLUG_CPU |
1893 | extern void idle_task_exit(void); | |
1894 | #else | |
1895 | static inline void idle_task_exit(void) {} | |
1896 | #endif | |
1897 | ||
06d8308c TG |
1898 | #if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP) |
1899 | extern void wake_up_idle_cpu(int cpu); | |
1900 | #else | |
1901 | static inline void wake_up_idle_cpu(int cpu) { } | |
1902 | #endif | |
1903 | ||
21805085 | 1904 | extern unsigned int sysctl_sched_latency; |
b2be5e96 | 1905 | extern unsigned int sysctl_sched_min_granularity; |
bf0f6f24 | 1906 | extern unsigned int sysctl_sched_wakeup_granularity; |
bf0f6f24 | 1907 | extern unsigned int sysctl_sched_child_runs_first; |
1983a922 CE |
1908 | |
1909 | enum sched_tunable_scaling { | |
1910 | SCHED_TUNABLESCALING_NONE, | |
1911 | SCHED_TUNABLESCALING_LOG, | |
1912 | SCHED_TUNABLESCALING_LINEAR, | |
1913 | SCHED_TUNABLESCALING_END, | |
1914 | }; | |
1915 | extern enum sched_tunable_scaling sysctl_sched_tunable_scaling; | |
1916 | ||
2bba22c5 | 1917 | #ifdef CONFIG_SCHED_DEBUG |
da84d961 | 1918 | extern unsigned int sysctl_sched_migration_cost; |
b82d9fdd | 1919 | extern unsigned int sysctl_sched_nr_migrate; |
e9e9250b | 1920 | extern unsigned int sysctl_sched_time_avg; |
cd1bb94b | 1921 | extern unsigned int sysctl_timer_migration; |
a7a4f8a7 | 1922 | extern unsigned int sysctl_sched_shares_window; |
b2be5e96 | 1923 | |
1983a922 | 1924 | int sched_proc_update_handler(struct ctl_table *table, int write, |
8d65af78 | 1925 | void __user *buffer, size_t *length, |
b2be5e96 | 1926 | loff_t *ppos); |
2bd8e6d4 | 1927 | #endif |
eea08f32 AB |
1928 | #ifdef CONFIG_SCHED_DEBUG |
1929 | static inline unsigned int get_sysctl_timer_migration(void) | |
1930 | { | |
1931 | return sysctl_timer_migration; | |
1932 | } | |
1933 | #else | |
1934 | static inline unsigned int get_sysctl_timer_migration(void) | |
1935 | { | |
1936 | return 1; | |
1937 | } | |
1938 | #endif | |
9f0c1e56 PZ |
1939 | extern unsigned int sysctl_sched_rt_period; |
1940 | extern int sysctl_sched_rt_runtime; | |
2bd8e6d4 | 1941 | |
d0b27fa7 | 1942 | int sched_rt_handler(struct ctl_table *table, int write, |
8d65af78 | 1943 | void __user *buffer, size_t *lenp, |
d0b27fa7 PZ |
1944 | loff_t *ppos); |
1945 | ||
5091faa4 MG |
1946 | #ifdef CONFIG_SCHED_AUTOGROUP |
1947 | extern unsigned int sysctl_sched_autogroup_enabled; | |
1948 | ||
1949 | extern void sched_autogroup_create_attach(struct task_struct *p); | |
1950 | extern void sched_autogroup_detach(struct task_struct *p); | |
1951 | extern void sched_autogroup_fork(struct signal_struct *sig); | |
1952 | extern void sched_autogroup_exit(struct signal_struct *sig); | |
1953 | #ifdef CONFIG_PROC_FS | |
1954 | extern void proc_sched_autogroup_show_task(struct task_struct *p, struct seq_file *m); | |
1955 | extern int proc_sched_autogroup_set_nice(struct task_struct *p, int *nice); | |
1956 | #endif | |
1957 | #else | |
1958 | static inline void sched_autogroup_create_attach(struct task_struct *p) { } | |
1959 | static inline void sched_autogroup_detach(struct task_struct *p) { } | |
1960 | static inline void sched_autogroup_fork(struct signal_struct *sig) { } | |
1961 | static inline void sched_autogroup_exit(struct signal_struct *sig) { } | |
1962 | #endif | |
1963 | ||
b29739f9 | 1964 | #ifdef CONFIG_RT_MUTEXES |
36c8b586 IM |
1965 | extern int rt_mutex_getprio(struct task_struct *p); |
1966 | extern void rt_mutex_setprio(struct task_struct *p, int prio); | |
1967 | extern void rt_mutex_adjust_pi(struct task_struct *p); | |
b29739f9 | 1968 | #else |
e868171a | 1969 | static inline int rt_mutex_getprio(struct task_struct *p) |
b29739f9 IM |
1970 | { |
1971 | return p->normal_prio; | |
1972 | } | |
95e02ca9 | 1973 | # define rt_mutex_adjust_pi(p) do { } while (0) |
b29739f9 IM |
1974 | #endif |
1975 | ||
d95f4122 | 1976 | extern bool yield_to(struct task_struct *p, bool preempt); |
36c8b586 IM |
1977 | extern void set_user_nice(struct task_struct *p, long nice); |
1978 | extern int task_prio(const struct task_struct *p); | |
1979 | extern int task_nice(const struct task_struct *p); | |
1980 | extern int can_nice(const struct task_struct *p, const int nice); | |
1981 | extern int task_curr(const struct task_struct *p); | |
1da177e4 | 1982 | extern int idle_cpu(int cpu); |
fe7de49f KM |
1983 | extern int sched_setscheduler(struct task_struct *, int, |
1984 | const struct sched_param *); | |
961ccddd | 1985 | extern int sched_setscheduler_nocheck(struct task_struct *, int, |
fe7de49f | 1986 | const struct sched_param *); |
36c8b586 IM |
1987 | extern struct task_struct *idle_task(int cpu); |
1988 | extern struct task_struct *curr_task(int cpu); | |
1989 | extern void set_curr_task(int cpu, struct task_struct *p); | |
1da177e4 LT |
1990 | |
1991 | void yield(void); | |
1992 | ||
1993 | /* | |
1994 | * The default (Linux) execution domain. | |
1995 | */ | |
1996 | extern struct exec_domain default_exec_domain; | |
1997 | ||
1998 | union thread_union { | |
1999 | struct thread_info thread_info; | |
2000 | unsigned long stack[THREAD_SIZE/sizeof(long)]; | |
2001 | }; | |
2002 | ||
2003 | #ifndef __HAVE_ARCH_KSTACK_END | |
2004 | static inline int kstack_end(void *addr) | |
2005 | { | |
2006 | /* Reliable end of stack detection: | |
2007 | * Some APM bios versions misalign the stack | |
2008 | */ | |
2009 | return !(((unsigned long)addr+sizeof(void*)-1) & (THREAD_SIZE-sizeof(void*))); | |
2010 | } | |
2011 | #endif | |
2012 | ||
2013 | extern union thread_union init_thread_union; | |
2014 | extern struct task_struct init_task; | |
2015 | ||
2016 | extern struct mm_struct init_mm; | |
2017 | ||
198fe21b PE |
2018 | extern struct pid_namespace init_pid_ns; |
2019 | ||
2020 | /* | |
2021 | * find a task by one of its numerical ids | |
2022 | * | |
198fe21b PE |
2023 | * find_task_by_pid_ns(): |
2024 | * finds a task by its pid in the specified namespace | |
228ebcbe PE |
2025 | * find_task_by_vpid(): |
2026 | * finds a task by its virtual pid | |
198fe21b | 2027 | * |
e49859e7 | 2028 | * see also find_vpid() etc in include/linux/pid.h |
198fe21b PE |
2029 | */ |
2030 | ||
228ebcbe PE |
2031 | extern struct task_struct *find_task_by_vpid(pid_t nr); |
2032 | extern struct task_struct *find_task_by_pid_ns(pid_t nr, | |
2033 | struct pid_namespace *ns); | |
198fe21b | 2034 | |
8520d7c7 | 2035 | extern void __set_special_pids(struct pid *pid); |
1da177e4 LT |
2036 | |
2037 | /* per-UID process charging. */ | |
acce292c | 2038 | extern struct user_struct * alloc_uid(struct user_namespace *, uid_t); |
1da177e4 LT |
2039 | static inline struct user_struct *get_uid(struct user_struct *u) |
2040 | { | |
2041 | atomic_inc(&u->__count); | |
2042 | return u; | |
2043 | } | |
2044 | extern void free_uid(struct user_struct *); | |
28f300d2 | 2045 | extern void release_uids(struct user_namespace *ns); |
1da177e4 LT |
2046 | |
2047 | #include <asm/current.h> | |
2048 | ||
f0af911a | 2049 | extern void xtime_update(unsigned long ticks); |
1da177e4 | 2050 | |
b3c97528 HH |
2051 | extern int wake_up_state(struct task_struct *tsk, unsigned int state); |
2052 | extern int wake_up_process(struct task_struct *tsk); | |
2053 | extern void wake_up_new_task(struct task_struct *tsk, | |
2054 | unsigned long clone_flags); | |
1da177e4 LT |
2055 | #ifdef CONFIG_SMP |
2056 | extern void kick_process(struct task_struct *tsk); | |
2057 | #else | |
2058 | static inline void kick_process(struct task_struct *tsk) { } | |
2059 | #endif | |
ad46c2c4 IM |
2060 | extern void sched_fork(struct task_struct *p, int clone_flags); |
2061 | extern void sched_dead(struct task_struct *p); | |
1da177e4 | 2062 | |
1da177e4 LT |
2063 | extern void proc_caches_init(void); |
2064 | extern void flush_signals(struct task_struct *); | |
3bcac026 | 2065 | extern void __flush_signals(struct task_struct *); |
10ab825b | 2066 | extern void ignore_signals(struct task_struct *); |
1da177e4 LT |
2067 | extern void flush_signal_handlers(struct task_struct *, int force_default); |
2068 | extern int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info); | |
2069 | ||
2070 | static inline int dequeue_signal_lock(struct task_struct *tsk, sigset_t *mask, siginfo_t *info) | |
2071 | { | |
2072 | unsigned long flags; | |
2073 | int ret; | |
2074 | ||
2075 | spin_lock_irqsave(&tsk->sighand->siglock, flags); | |
2076 | ret = dequeue_signal(tsk, mask, info); | |
2077 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); | |
2078 | ||
2079 | return ret; | |
2080 | } | |
2081 | ||
2082 | extern void block_all_signals(int (*notifier)(void *priv), void *priv, | |
2083 | sigset_t *mask); | |
2084 | extern void unblock_all_signals(void); | |
2085 | extern void release_task(struct task_struct * p); | |
2086 | extern int send_sig_info(int, struct siginfo *, struct task_struct *); | |
1da177e4 LT |
2087 | extern int force_sigsegv(int, struct task_struct *); |
2088 | extern int force_sig_info(int, struct siginfo *, struct task_struct *); | |
c4b92fc1 | 2089 | extern int __kill_pgrp_info(int sig, struct siginfo *info, struct pid *pgrp); |
c4b92fc1 | 2090 | extern int kill_pid_info(int sig, struct siginfo *info, struct pid *pid); |
2425c08b | 2091 | extern int kill_pid_info_as_uid(int, struct siginfo *, struct pid *, uid_t, uid_t, u32); |
c4b92fc1 EB |
2092 | extern int kill_pgrp(struct pid *pid, int sig, int priv); |
2093 | extern int kill_pid(struct pid *pid, int sig, int priv); | |
c3de4b38 | 2094 | extern int kill_proc_info(int, struct siginfo *, pid_t); |
2b2a1ff6 | 2095 | extern int do_notify_parent(struct task_struct *, int); |
a7f0765e | 2096 | extern void __wake_up_parent(struct task_struct *p, struct task_struct *parent); |
1da177e4 | 2097 | extern void force_sig(int, struct task_struct *); |
1da177e4 | 2098 | extern int send_sig(int, struct task_struct *, int); |
09faef11 | 2099 | extern int zap_other_threads(struct task_struct *p); |
1da177e4 LT |
2100 | extern struct sigqueue *sigqueue_alloc(void); |
2101 | extern void sigqueue_free(struct sigqueue *); | |
ac5c2153 | 2102 | extern int send_sigqueue(struct sigqueue *, struct task_struct *, int group); |
9ac95f2f | 2103 | extern int do_sigaction(int, struct k_sigaction *, struct k_sigaction *); |
1da177e4 LT |
2104 | extern int do_sigaltstack(const stack_t __user *, stack_t __user *, unsigned long); |
2105 | ||
9ec52099 CLG |
2106 | static inline int kill_cad_pid(int sig, int priv) |
2107 | { | |
2108 | return kill_pid(cad_pid, sig, priv); | |
2109 | } | |
2110 | ||
1da177e4 LT |
2111 | /* These can be the second arg to send_sig_info/send_group_sig_info. */ |
2112 | #define SEND_SIG_NOINFO ((struct siginfo *) 0) | |
2113 | #define SEND_SIG_PRIV ((struct siginfo *) 1) | |
2114 | #define SEND_SIG_FORCED ((struct siginfo *) 2) | |
2115 | ||
2a855dd0 SAS |
2116 | /* |
2117 | * True if we are on the alternate signal stack. | |
2118 | */ | |
1da177e4 LT |
2119 | static inline int on_sig_stack(unsigned long sp) |
2120 | { | |
2a855dd0 SAS |
2121 | #ifdef CONFIG_STACK_GROWSUP |
2122 | return sp >= current->sas_ss_sp && | |
2123 | sp - current->sas_ss_sp < current->sas_ss_size; | |
2124 | #else | |
2125 | return sp > current->sas_ss_sp && | |
2126 | sp - current->sas_ss_sp <= current->sas_ss_size; | |
2127 | #endif | |
1da177e4 LT |
2128 | } |
2129 | ||
2130 | static inline int sas_ss_flags(unsigned long sp) | |
2131 | { | |
2132 | return (current->sas_ss_size == 0 ? SS_DISABLE | |
2133 | : on_sig_stack(sp) ? SS_ONSTACK : 0); | |
2134 | } | |
2135 | ||
1da177e4 LT |
2136 | /* |
2137 | * Routines for handling mm_structs | |
2138 | */ | |
2139 | extern struct mm_struct * mm_alloc(void); | |
2140 | ||
2141 | /* mmdrop drops the mm and the page tables */ | |
b3c97528 | 2142 | extern void __mmdrop(struct mm_struct *); |
1da177e4 LT |
2143 | static inline void mmdrop(struct mm_struct * mm) |
2144 | { | |
6fb43d7b | 2145 | if (unlikely(atomic_dec_and_test(&mm->mm_count))) |
1da177e4 LT |
2146 | __mmdrop(mm); |
2147 | } | |
2148 | ||
2149 | /* mmput gets rid of the mappings and all user-space */ | |
2150 | extern void mmput(struct mm_struct *); | |
2151 | /* Grab a reference to a task's mm, if it is not already going away */ | |
2152 | extern struct mm_struct *get_task_mm(struct task_struct *task); | |
2153 | /* Remove the current tasks stale references to the old mm_struct */ | |
2154 | extern void mm_release(struct task_struct *, struct mm_struct *); | |
402b0862 CO |
2155 | /* Allocate a new mm structure and copy contents from tsk->mm */ |
2156 | extern struct mm_struct *dup_mm(struct task_struct *tsk); | |
1da177e4 | 2157 | |
6f2c55b8 AD |
2158 | extern int copy_thread(unsigned long, unsigned long, unsigned long, |
2159 | struct task_struct *, struct pt_regs *); | |
1da177e4 LT |
2160 | extern void flush_thread(void); |
2161 | extern void exit_thread(void); | |
2162 | ||
1da177e4 | 2163 | extern void exit_files(struct task_struct *); |
a7e5328a | 2164 | extern void __cleanup_sighand(struct sighand_struct *); |
cbaffba1 | 2165 | |
1da177e4 | 2166 | extern void exit_itimers(struct signal_struct *); |
cbaffba1 | 2167 | extern void flush_itimer_signals(void); |
1da177e4 LT |
2168 | |
2169 | extern NORET_TYPE void do_group_exit(int); | |
2170 | ||
1da177e4 LT |
2171 | extern void daemonize(const char *, ...); |
2172 | extern int allow_signal(int); | |
2173 | extern int disallow_signal(int); | |
1da177e4 | 2174 | |
d7627467 DH |
2175 | extern int do_execve(const char *, |
2176 | const char __user * const __user *, | |
2177 | const char __user * const __user *, struct pt_regs *); | |
1da177e4 | 2178 | extern long do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long, int __user *, int __user *); |
36c8b586 | 2179 | struct task_struct *fork_idle(int); |
1da177e4 LT |
2180 | |
2181 | extern void set_task_comm(struct task_struct *tsk, char *from); | |
59714d65 | 2182 | extern char *get_task_comm(char *to, struct task_struct *tsk); |
1da177e4 LT |
2183 | |
2184 | #ifdef CONFIG_SMP | |
85ba2d86 | 2185 | extern unsigned long wait_task_inactive(struct task_struct *, long match_state); |
1da177e4 | 2186 | #else |
85ba2d86 RM |
2187 | static inline unsigned long wait_task_inactive(struct task_struct *p, |
2188 | long match_state) | |
2189 | { | |
2190 | return 1; | |
2191 | } | |
1da177e4 LT |
2192 | #endif |
2193 | ||
05725f7e JP |
2194 | #define next_task(p) \ |
2195 | list_entry_rcu((p)->tasks.next, struct task_struct, tasks) | |
1da177e4 LT |
2196 | |
2197 | #define for_each_process(p) \ | |
2198 | for (p = &init_task ; (p = next_task(p)) != &init_task ; ) | |
2199 | ||
5bb459bb | 2200 | extern bool current_is_single_threaded(void); |
d84f4f99 | 2201 | |
1da177e4 LT |
2202 | /* |
2203 | * Careful: do_each_thread/while_each_thread is a double loop so | |
2204 | * 'break' will not work as expected - use goto instead. | |
2205 | */ | |
2206 | #define do_each_thread(g, t) \ | |
2207 | for (g = t = &init_task ; (g = t = next_task(g)) != &init_task ; ) do | |
2208 | ||
2209 | #define while_each_thread(g, t) \ | |
2210 | while ((t = next_thread(t)) != g) | |
2211 | ||
7e49827c ON |
2212 | static inline int get_nr_threads(struct task_struct *tsk) |
2213 | { | |
b3ac022c | 2214 | return tsk->signal->nr_threads; |
7e49827c ON |
2215 | } |
2216 | ||
de12a787 EB |
2217 | /* de_thread depends on thread_group_leader not being a pid based check */ |
2218 | #define thread_group_leader(p) (p == p->group_leader) | |
1da177e4 | 2219 | |
0804ef4b EB |
2220 | /* Do to the insanities of de_thread it is possible for a process |
2221 | * to have the pid of the thread group leader without actually being | |
2222 | * the thread group leader. For iteration through the pids in proc | |
2223 | * all we care about is that we have a task with the appropriate | |
2224 | * pid, we don't actually care if we have the right task. | |
2225 | */ | |
e868171a | 2226 | static inline int has_group_leader_pid(struct task_struct *p) |
0804ef4b EB |
2227 | { |
2228 | return p->pid == p->tgid; | |
2229 | } | |
2230 | ||
bac0abd6 PE |
2231 | static inline |
2232 | int same_thread_group(struct task_struct *p1, struct task_struct *p2) | |
2233 | { | |
2234 | return p1->tgid == p2->tgid; | |
2235 | } | |
2236 | ||
36c8b586 | 2237 | static inline struct task_struct *next_thread(const struct task_struct *p) |
47e65328 | 2238 | { |
05725f7e JP |
2239 | return list_entry_rcu(p->thread_group.next, |
2240 | struct task_struct, thread_group); | |
47e65328 ON |
2241 | } |
2242 | ||
e868171a | 2243 | static inline int thread_group_empty(struct task_struct *p) |
1da177e4 | 2244 | { |
47e65328 | 2245 | return list_empty(&p->thread_group); |
1da177e4 LT |
2246 | } |
2247 | ||
2248 | #define delay_group_leader(p) \ | |
2249 | (thread_group_leader(p) && !thread_group_empty(p)) | |
2250 | ||
39c626ae ON |
2251 | static inline int task_detached(struct task_struct *p) |
2252 | { | |
2253 | return p->exit_signal == -1; | |
2254 | } | |
2255 | ||
1da177e4 | 2256 | /* |
260ea101 | 2257 | * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
22e2c507 | 2258 | * subscriptions and synchronises with wait4(). Also used in procfs. Also |
ddbcc7e8 PM |
2259 | * pins the final release of task.io_context. Also protects ->cpuset and |
2260 | * ->cgroup.subsys[]. | |
1da177e4 LT |
2261 | * |
2262 | * Nests both inside and outside of read_lock(&tasklist_lock). | |
2263 | * It must not be nested with write_lock_irq(&tasklist_lock), | |
2264 | * neither inside nor outside. | |
2265 | */ | |
2266 | static inline void task_lock(struct task_struct *p) | |
2267 | { | |
2268 | spin_lock(&p->alloc_lock); | |
2269 | } | |
2270 | ||
2271 | static inline void task_unlock(struct task_struct *p) | |
2272 | { | |
2273 | spin_unlock(&p->alloc_lock); | |
2274 | } | |
2275 | ||
b8ed374e | 2276 | extern struct sighand_struct *__lock_task_sighand(struct task_struct *tsk, |
f63ee72e ON |
2277 | unsigned long *flags); |
2278 | ||
b8ed374e NK |
2279 | #define lock_task_sighand(tsk, flags) \ |
2280 | ({ struct sighand_struct *__ss; \ | |
2281 | __cond_lock(&(tsk)->sighand->siglock, \ | |
2282 | (__ss = __lock_task_sighand(tsk, flags))); \ | |
2283 | __ss; \ | |
2284 | }) \ | |
2285 | ||
f63ee72e ON |
2286 | static inline void unlock_task_sighand(struct task_struct *tsk, |
2287 | unsigned long *flags) | |
2288 | { | |
2289 | spin_unlock_irqrestore(&tsk->sighand->siglock, *flags); | |
2290 | } | |
2291 | ||
f037360f AV |
2292 | #ifndef __HAVE_THREAD_FUNCTIONS |
2293 | ||
f7e4217b RZ |
2294 | #define task_thread_info(task) ((struct thread_info *)(task)->stack) |
2295 | #define task_stack_page(task) ((task)->stack) | |
a1261f54 | 2296 | |
10ebffde AV |
2297 | static inline void setup_thread_stack(struct task_struct *p, struct task_struct *org) |
2298 | { | |
2299 | *task_thread_info(p) = *task_thread_info(org); | |
2300 | task_thread_info(p)->task = p; | |
2301 | } | |
2302 | ||
2303 | static inline unsigned long *end_of_stack(struct task_struct *p) | |
2304 | { | |
f7e4217b | 2305 | return (unsigned long *)(task_thread_info(p) + 1); |
10ebffde AV |
2306 | } |
2307 | ||
f037360f AV |
2308 | #endif |
2309 | ||
8b05c7e6 FT |
2310 | static inline int object_is_on_stack(void *obj) |
2311 | { | |
2312 | void *stack = task_stack_page(current); | |
2313 | ||
2314 | return (obj >= stack) && (obj < (stack + THREAD_SIZE)); | |
2315 | } | |
2316 | ||
8c9843e5 BH |
2317 | extern void thread_info_cache_init(void); |
2318 | ||
7c9f8861 ES |
2319 | #ifdef CONFIG_DEBUG_STACK_USAGE |
2320 | static inline unsigned long stack_not_used(struct task_struct *p) | |
2321 | { | |
2322 | unsigned long *n = end_of_stack(p); | |
2323 | ||
2324 | do { /* Skip over canary */ | |
2325 | n++; | |
2326 | } while (!*n); | |
2327 | ||
2328 | return (unsigned long)n - (unsigned long)end_of_stack(p); | |
2329 | } | |
2330 | #endif | |
2331 | ||
1da177e4 LT |
2332 | /* set thread flags in other task's structures |
2333 | * - see asm/thread_info.h for TIF_xxxx flags available | |
2334 | */ | |
2335 | static inline void set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2336 | { | |
a1261f54 | 2337 | set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2338 | } |
2339 | ||
2340 | static inline void clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2341 | { | |
a1261f54 | 2342 | clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2343 | } |
2344 | ||
2345 | static inline int test_and_set_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2346 | { | |
a1261f54 | 2347 | return test_and_set_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2348 | } |
2349 | ||
2350 | static inline int test_and_clear_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2351 | { | |
a1261f54 | 2352 | return test_and_clear_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2353 | } |
2354 | ||
2355 | static inline int test_tsk_thread_flag(struct task_struct *tsk, int flag) | |
2356 | { | |
a1261f54 | 2357 | return test_ti_thread_flag(task_thread_info(tsk), flag); |
1da177e4 LT |
2358 | } |
2359 | ||
2360 | static inline void set_tsk_need_resched(struct task_struct *tsk) | |
2361 | { | |
2362 | set_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2363 | } | |
2364 | ||
2365 | static inline void clear_tsk_need_resched(struct task_struct *tsk) | |
2366 | { | |
2367 | clear_tsk_thread_flag(tsk,TIF_NEED_RESCHED); | |
2368 | } | |
2369 | ||
8ae121ac GH |
2370 | static inline int test_tsk_need_resched(struct task_struct *tsk) |
2371 | { | |
2372 | return unlikely(test_tsk_thread_flag(tsk,TIF_NEED_RESCHED)); | |
2373 | } | |
2374 | ||
690cc3ff EB |
2375 | static inline int restart_syscall(void) |
2376 | { | |
2377 | set_tsk_thread_flag(current, TIF_SIGPENDING); | |
2378 | return -ERESTARTNOINTR; | |
2379 | } | |
2380 | ||
1da177e4 LT |
2381 | static inline int signal_pending(struct task_struct *p) |
2382 | { | |
2383 | return unlikely(test_tsk_thread_flag(p,TIF_SIGPENDING)); | |
2384 | } | |
f776d12d | 2385 | |
d9588725 RM |
2386 | static inline int __fatal_signal_pending(struct task_struct *p) |
2387 | { | |
2388 | return unlikely(sigismember(&p->pending.signal, SIGKILL)); | |
2389 | } | |
f776d12d MW |
2390 | |
2391 | static inline int fatal_signal_pending(struct task_struct *p) | |
2392 | { | |
2393 | return signal_pending(p) && __fatal_signal_pending(p); | |
2394 | } | |
2395 | ||
16882c1e ON |
2396 | static inline int signal_pending_state(long state, struct task_struct *p) |
2397 | { | |
2398 | if (!(state & (TASK_INTERRUPTIBLE | TASK_WAKEKILL))) | |
2399 | return 0; | |
2400 | if (!signal_pending(p)) | |
2401 | return 0; | |
2402 | ||
16882c1e ON |
2403 | return (state & TASK_INTERRUPTIBLE) || __fatal_signal_pending(p); |
2404 | } | |
2405 | ||
1da177e4 LT |
2406 | static inline int need_resched(void) |
2407 | { | |
9404ef02 | 2408 | return unlikely(test_thread_flag(TIF_NEED_RESCHED)); |
1da177e4 LT |
2409 | } |
2410 | ||
2411 | /* | |
2412 | * cond_resched() and cond_resched_lock(): latency reduction via | |
2413 | * explicit rescheduling in places that are safe. The return | |
2414 | * value indicates whether a reschedule was done in fact. | |
2415 | * cond_resched_lock() will drop the spinlock before scheduling, | |
2416 | * cond_resched_softirq() will enable bhs before scheduling. | |
2417 | */ | |
c3921ab7 | 2418 | extern int _cond_resched(void); |
6f80bd98 | 2419 | |
613afbf8 FW |
2420 | #define cond_resched() ({ \ |
2421 | __might_sleep(__FILE__, __LINE__, 0); \ | |
2422 | _cond_resched(); \ | |
2423 | }) | |
6f80bd98 | 2424 | |
613afbf8 FW |
2425 | extern int __cond_resched_lock(spinlock_t *lock); |
2426 | ||
716a4234 FW |
2427 | #ifdef CONFIG_PREEMPT |
2428 | #define PREEMPT_LOCK_OFFSET PREEMPT_OFFSET | |
02b67cc3 | 2429 | #else |
716a4234 | 2430 | #define PREEMPT_LOCK_OFFSET 0 |
02b67cc3 | 2431 | #endif |
716a4234 | 2432 | |
613afbf8 | 2433 | #define cond_resched_lock(lock) ({ \ |
716a4234 | 2434 | __might_sleep(__FILE__, __LINE__, PREEMPT_LOCK_OFFSET); \ |
613afbf8 FW |
2435 | __cond_resched_lock(lock); \ |
2436 | }) | |
2437 | ||
2438 | extern int __cond_resched_softirq(void); | |
2439 | ||
75e1056f VP |
2440 | #define cond_resched_softirq() ({ \ |
2441 | __might_sleep(__FILE__, __LINE__, SOFTIRQ_DISABLE_OFFSET); \ | |
2442 | __cond_resched_softirq(); \ | |
613afbf8 | 2443 | }) |
1da177e4 LT |
2444 | |
2445 | /* | |
2446 | * Does a critical section need to be broken due to another | |
95c354fe NP |
2447 | * task waiting?: (technically does not depend on CONFIG_PREEMPT, |
2448 | * but a general need for low latency) | |
1da177e4 | 2449 | */ |
95c354fe | 2450 | static inline int spin_needbreak(spinlock_t *lock) |
1da177e4 | 2451 | { |
95c354fe NP |
2452 | #ifdef CONFIG_PREEMPT |
2453 | return spin_is_contended(lock); | |
2454 | #else | |
1da177e4 | 2455 | return 0; |
95c354fe | 2456 | #endif |
1da177e4 LT |
2457 | } |
2458 | ||
f06febc9 FM |
2459 | /* |
2460 | * Thread group CPU time accounting. | |
2461 | */ | |
4cd4c1b4 | 2462 | void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times); |
4da94d49 | 2463 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times); |
f06febc9 | 2464 | |
490dea45 | 2465 | static inline void thread_group_cputime_init(struct signal_struct *sig) |
f06febc9 | 2466 | { |
4cd4c1b4 | 2467 | spin_lock_init(&sig->cputimer.lock); |
f06febc9 FM |
2468 | } |
2469 | ||
7bb44ade RM |
2470 | /* |
2471 | * Reevaluate whether the task has signals pending delivery. | |
2472 | * Wake the task if so. | |
2473 | * This is required every time the blocked sigset_t changes. | |
2474 | * callers must hold sighand->siglock. | |
2475 | */ | |
2476 | extern void recalc_sigpending_and_wake(struct task_struct *t); | |
1da177e4 LT |
2477 | extern void recalc_sigpending(void); |
2478 | ||
2479 | extern void signal_wake_up(struct task_struct *t, int resume_stopped); | |
2480 | ||
2481 | /* | |
2482 | * Wrappers for p->thread_info->cpu access. No-op on UP. | |
2483 | */ | |
2484 | #ifdef CONFIG_SMP | |
2485 | ||
2486 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2487 | { | |
a1261f54 | 2488 | return task_thread_info(p)->cpu; |
1da177e4 LT |
2489 | } |
2490 | ||
c65cc870 | 2491 | extern void set_task_cpu(struct task_struct *p, unsigned int cpu); |
1da177e4 LT |
2492 | |
2493 | #else | |
2494 | ||
2495 | static inline unsigned int task_cpu(const struct task_struct *p) | |
2496 | { | |
2497 | return 0; | |
2498 | } | |
2499 | ||
2500 | static inline void set_task_cpu(struct task_struct *p, unsigned int cpu) | |
2501 | { | |
2502 | } | |
2503 | ||
2504 | #endif /* CONFIG_SMP */ | |
2505 | ||
96f874e2 RR |
2506 | extern long sched_setaffinity(pid_t pid, const struct cpumask *new_mask); |
2507 | extern long sched_getaffinity(pid_t pid, struct cpumask *mask); | |
5c45bf27 | 2508 | |
1da177e4 LT |
2509 | extern void normalize_rt_tasks(void); |
2510 | ||
7c941438 | 2511 | #ifdef CONFIG_CGROUP_SCHED |
9b5b7751 | 2512 | |
07e06b01 | 2513 | extern struct task_group root_task_group; |
9b5b7751 | 2514 | |
ec7dc8ac | 2515 | extern struct task_group *sched_create_group(struct task_group *parent); |
4cf86d77 | 2516 | extern void sched_destroy_group(struct task_group *tg); |
9b5b7751 | 2517 | extern void sched_move_task(struct task_struct *tsk); |
052f1dc7 | 2518 | #ifdef CONFIG_FAIR_GROUP_SCHED |
4cf86d77 | 2519 | extern int sched_group_set_shares(struct task_group *tg, unsigned long shares); |
5cb350ba | 2520 | extern unsigned long sched_group_shares(struct task_group *tg); |
052f1dc7 PZ |
2521 | #endif |
2522 | #ifdef CONFIG_RT_GROUP_SCHED | |
9f0c1e56 PZ |
2523 | extern int sched_group_set_rt_runtime(struct task_group *tg, |
2524 | long rt_runtime_us); | |
2525 | extern long sched_group_rt_runtime(struct task_group *tg); | |
d0b27fa7 PZ |
2526 | extern int sched_group_set_rt_period(struct task_group *tg, |
2527 | long rt_period_us); | |
2528 | extern long sched_group_rt_period(struct task_group *tg); | |
54e99124 | 2529 | extern int sched_rt_can_attach(struct task_group *tg, struct task_struct *tsk); |
052f1dc7 | 2530 | #endif |
9b5b7751 SV |
2531 | #endif |
2532 | ||
54e99124 DG |
2533 | extern int task_can_switch_user(struct user_struct *up, |
2534 | struct task_struct *tsk); | |
2535 | ||
4b98d11b AD |
2536 | #ifdef CONFIG_TASK_XACCT |
2537 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2538 | { | |
940389b8 | 2539 | tsk->ioac.rchar += amt; |
4b98d11b AD |
2540 | } |
2541 | ||
2542 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2543 | { | |
940389b8 | 2544 | tsk->ioac.wchar += amt; |
4b98d11b AD |
2545 | } |
2546 | ||
2547 | static inline void inc_syscr(struct task_struct *tsk) | |
2548 | { | |
940389b8 | 2549 | tsk->ioac.syscr++; |
4b98d11b AD |
2550 | } |
2551 | ||
2552 | static inline void inc_syscw(struct task_struct *tsk) | |
2553 | { | |
940389b8 | 2554 | tsk->ioac.syscw++; |
4b98d11b AD |
2555 | } |
2556 | #else | |
2557 | static inline void add_rchar(struct task_struct *tsk, ssize_t amt) | |
2558 | { | |
2559 | } | |
2560 | ||
2561 | static inline void add_wchar(struct task_struct *tsk, ssize_t amt) | |
2562 | { | |
2563 | } | |
2564 | ||
2565 | static inline void inc_syscr(struct task_struct *tsk) | |
2566 | { | |
2567 | } | |
2568 | ||
2569 | static inline void inc_syscw(struct task_struct *tsk) | |
2570 | { | |
2571 | } | |
2572 | #endif | |
2573 | ||
82455257 DH |
2574 | #ifndef TASK_SIZE_OF |
2575 | #define TASK_SIZE_OF(tsk) TASK_SIZE | |
2576 | #endif | |
2577 | ||
cf475ad2 BS |
2578 | #ifdef CONFIG_MM_OWNER |
2579 | extern void mm_update_next_owner(struct mm_struct *mm); | |
2580 | extern void mm_init_owner(struct mm_struct *mm, struct task_struct *p); | |
2581 | #else | |
2582 | static inline void mm_update_next_owner(struct mm_struct *mm) | |
2583 | { | |
2584 | } | |
2585 | ||
2586 | static inline void mm_init_owner(struct mm_struct *mm, struct task_struct *p) | |
2587 | { | |
2588 | } | |
2589 | #endif /* CONFIG_MM_OWNER */ | |
2590 | ||
3e10e716 JS |
2591 | static inline unsigned long task_rlimit(const struct task_struct *tsk, |
2592 | unsigned int limit) | |
2593 | { | |
2594 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_cur); | |
2595 | } | |
2596 | ||
2597 | static inline unsigned long task_rlimit_max(const struct task_struct *tsk, | |
2598 | unsigned int limit) | |
2599 | { | |
2600 | return ACCESS_ONCE(tsk->signal->rlim[limit].rlim_max); | |
2601 | } | |
2602 | ||
2603 | static inline unsigned long rlimit(unsigned int limit) | |
2604 | { | |
2605 | return task_rlimit(current, limit); | |
2606 | } | |
2607 | ||
2608 | static inline unsigned long rlimit_max(unsigned int limit) | |
2609 | { | |
2610 | return task_rlimit_max(current, limit); | |
2611 | } | |
2612 | ||
1da177e4 LT |
2613 | #endif /* __KERNEL__ */ |
2614 | ||
2615 | #endif |