2 * linux/fs/proc/array.c
4 * Copyright (C) 1992 by Linus Torvalds
5 * based on ideas by Darren Senn
8 * Michael. K. Johnson: stat,statm extensions.
9 * <johnsonm@stolaf.edu>
11 * Pauline Middelink : Made cmdline,envline only break at '\0's, to
12 * make sure SET_PROCTITLE works. Also removed
13 * bad '!' which forced address recalculation for
14 * EVERY character on the current page.
15 * <middelin@polyware.iaf.nl>
17 * Danny ter Haar : added cpuinfo
20 * Alessandro Rubini : profile extension.
21 * <rubini@ipvvis.unipv.it>
23 * Jeff Tranter : added BogoMips field to cpuinfo
24 * <Jeff_Tranter@Mitel.COM>
26 * Bruno Haible : remove 4K limit for the maps file
27 * <haible@ma2s2.mathematik.uni-karlsruhe.de>
29 * Yves Arrouye : remove removal of trailing spaces in get_array.
30 * <Yves.Arrouye@marin.fdn.fr>
32 * Jerome Forissier : added per-CPU time information to /proc/stat
33 * and /proc/<pid>/cpu extension
34 * <forissier@isia.cma.fr>
35 * - Incorporation and non-SMP safe operation
36 * of forissier patch in 2.1.78 by
37 * Hans Marcus <crowbar@concepts.nl>
39 * aeb@cwi.nl : /proc/partitions
42 * Alan Cox : security fixes.
43 * <alan@lxorguk.ukuu.org.uk>
45 * Al Viro : safe handling of mm_struct
47 * Gerhard Wichert : added BIGMEM support
48 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
50 * Al Viro & Jeff Garzik : moved most of the thing into base.c and
51 * : proc_misc.c. The rest may eventually go into
55 #include <linux/types.h>
56 #include <linux/errno.h>
57 #include <linux/time.h>
58 #include <linux/kernel.h>
59 #include <linux/kernel_stat.h>
60 #include <linux/tty.h>
61 #include <linux/string.h>
62 #include <linux/mman.h>
63 #include <linux/proc_fs.h>
64 #include <linux/ioport.h>
65 #include <linux/uaccess.h>
68 #include <linux/hugetlb.h>
69 #include <linux/pagemap.h>
70 #include <linux/swap.h>
71 #include <linux/slab.h>
72 #include <linux/smp.h>
73 #include <linux/signal.h>
74 #include <linux/highmem.h>
75 #include <linux/file.h>
76 #include <linux/fdtable.h>
77 #include <linux/times.h>
78 #include <linux/cpuset.h>
79 #include <linux/rcupdate.h>
80 #include <linux/delayacct.h>
81 #include <linux/seq_file.h>
82 #include <linux/pid_namespace.h>
83 #include <linux/ptrace.h>
84 #include <linux/tracehook.h>
85 #include <linux/swapops.h>
87 #include <asm/pgtable.h>
88 #include <asm/processor.h>
91 static inline void task_name(struct seq_file
*m
, struct task_struct
*p
)
96 char tcomm
[sizeof(p
->comm
)];
98 get_task_comm(tcomm
, p
);
100 seq_printf(m
, "Name:\t");
101 end
= m
->buf
+ m
->size
;
102 buf
= m
->buf
+ m
->count
;
105 while (i
&& (buf
< end
)) {
106 unsigned char c
= *name
;
126 m
->count
= buf
- m
->buf
;
131 * The task state array is a strange "bitmap" of
132 * reasons to sleep. Thus "running" is zero, and
133 * you can test for combinations of others with
136 static const char *task_state_array
[] = {
137 "R (running)", /* 0 */
138 "S (sleeping)", /* 1 */
139 "D (disk sleep)", /* 2 */
140 "T (stopped)", /* 4 */
141 "t (tracing stop)", /* 8 */
142 "Z (zombie)", /* 16 */
145 "K (wakekill)", /* 128 */
146 "W (waking)", /* 256 */
149 static inline const char *get_task_state(struct task_struct
*tsk
)
151 unsigned int state
= (tsk
->state
& TASK_REPORT
) | tsk
->exit_state
;
152 const char **p
= &task_state_array
[0];
154 BUILD_BUG_ON(1 + ilog2(TASK_STATE_MAX
) != ARRAY_SIZE(task_state_array
));
163 static inline void task_state(struct seq_file
*m
, struct pid_namespace
*ns
,
164 struct pid
*pid
, struct task_struct
*p
)
166 struct group_info
*group_info
;
168 struct fdtable
*fdt
= NULL
;
169 const struct cred
*cred
;
173 ppid
= pid_alive(p
) ?
174 task_tgid_nr_ns(rcu_dereference(p
->real_parent
), ns
) : 0;
177 struct task_struct
*tracer
= tracehook_tracer_task(p
);
179 tpid
= task_pid_nr_ns(tracer
, ns
);
181 cred
= get_cred((struct cred
*) __task_cred(p
));
188 "Uid:\t%d\t%d\t%d\t%d\n"
189 "Gid:\t%d\t%d\t%d\t%d\n",
191 task_tgid_nr_ns(p
, ns
),
194 cred
->uid
, cred
->euid
, cred
->suid
, cred
->fsuid
,
195 cred
->gid
, cred
->egid
, cred
->sgid
, cred
->fsgid
);
199 fdt
= files_fdtable(p
->files
);
203 fdt
? fdt
->max_fds
: 0);
206 group_info
= cred
->group_info
;
209 for (g
= 0; g
< min(group_info
->ngroups
, NGROUPS_SMALL
); g
++)
210 seq_printf(m
, "%d ", GROUP_AT(group_info
, g
));
216 static void render_sigset_t(struct seq_file
*m
, const char *header
,
221 seq_printf(m
, "%s", header
);
228 if (sigismember(set
, i
+1)) x
|= 1;
229 if (sigismember(set
, i
+2)) x
|= 2;
230 if (sigismember(set
, i
+3)) x
|= 4;
231 if (sigismember(set
, i
+4)) x
|= 8;
232 seq_printf(m
, "%x", x
);
238 static void collect_sigign_sigcatch(struct task_struct
*p
, sigset_t
*ign
,
241 struct k_sigaction
*k
;
244 k
= p
->sighand
->action
;
245 for (i
= 1; i
<= _NSIG
; ++i
, ++k
) {
246 if (k
->sa
.sa_handler
== SIG_IGN
)
248 else if (k
->sa
.sa_handler
!= SIG_DFL
)
253 static inline void task_sig(struct seq_file
*m
, struct task_struct
*p
)
256 sigset_t pending
, shpending
, blocked
, ignored
, caught
;
258 unsigned long qsize
= 0;
259 unsigned long qlim
= 0;
261 sigemptyset(&pending
);
262 sigemptyset(&shpending
);
263 sigemptyset(&blocked
);
264 sigemptyset(&ignored
);
265 sigemptyset(&caught
);
267 if (lock_task_sighand(p
, &flags
)) {
268 pending
= p
->pending
.signal
;
269 shpending
= p
->signal
->shared_pending
.signal
;
270 blocked
= p
->blocked
;
271 collect_sigign_sigcatch(p
, &ignored
, &caught
);
272 num_threads
= atomic_read(&p
->signal
->count
);
273 qsize
= atomic_read(&__task_cred(p
)->user
->sigpending
);
274 qlim
= p
->signal
->rlim
[RLIMIT_SIGPENDING
].rlim_cur
;
275 unlock_task_sighand(p
, &flags
);
278 seq_printf(m
, "Threads:\t%d\n", num_threads
);
279 seq_printf(m
, "SigQ:\t%lu/%lu\n", qsize
, qlim
);
281 /* render them all */
282 render_sigset_t(m
, "SigPnd:\t", &pending
);
283 render_sigset_t(m
, "ShdPnd:\t", &shpending
);
284 render_sigset_t(m
, "SigBlk:\t", &blocked
);
285 render_sigset_t(m
, "SigIgn:\t", &ignored
);
286 render_sigset_t(m
, "SigCgt:\t", &caught
);
289 static void render_cap_t(struct seq_file
*m
, const char *header
,
294 seq_printf(m
, "%s", header
);
295 CAP_FOR_EACH_U32(__capi
) {
296 seq_printf(m
, "%08x",
297 a
->cap
[(_KERNEL_CAPABILITY_U32S
-1) - __capi
]);
302 static inline void task_cap(struct seq_file
*m
, struct task_struct
*p
)
304 const struct cred
*cred
;
305 kernel_cap_t cap_inheritable
, cap_permitted
, cap_effective
, cap_bset
;
308 cred
= __task_cred(p
);
309 cap_inheritable
= cred
->cap_inheritable
;
310 cap_permitted
= cred
->cap_permitted
;
311 cap_effective
= cred
->cap_effective
;
312 cap_bset
= cred
->cap_bset
;
315 render_cap_t(m
, "CapInh:\t", &cap_inheritable
);
316 render_cap_t(m
, "CapPrm:\t", &cap_permitted
);
317 render_cap_t(m
, "CapEff:\t", &cap_effective
);
318 render_cap_t(m
, "CapBnd:\t", &cap_bset
);
321 static inline void task_context_switch_counts(struct seq_file
*m
,
322 struct task_struct
*p
)
324 seq_printf(m
, "voluntary_ctxt_switches:\t%lu\n"
325 "nonvoluntary_ctxt_switches:\t%lu\n",
333 struct vm_area_struct
*vma
;
334 unsigned long startpage
;
338 static int stack_usage_pte_range(pmd_t
*pmd
, unsigned long addr
,
339 unsigned long end
, struct mm_walk
*walk
)
341 struct stack_stats
*ss
= walk
->private;
342 struct vm_area_struct
*vma
= ss
->vma
;
347 pte
= pte_offset_map_lock(vma
->vm_mm
, pmd
, addr
, &ptl
);
348 for (; addr
!= end
; pte
++, addr
+= PAGE_SIZE
) {
351 #ifdef CONFIG_STACK_GROWSUP
352 if (pte_present(ptent
) || is_swap_pte(ptent
))
353 ss
->usage
= addr
- ss
->startpage
+ PAGE_SIZE
;
355 if (pte_present(ptent
) || is_swap_pte(ptent
)) {
356 ss
->usage
= ss
->startpage
- addr
+ PAGE_SIZE
;
363 pte_unmap_unlock(pte
- 1, ptl
);
368 static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct
*vma
,
369 struct task_struct
*task
)
371 struct stack_stats ss
;
372 struct mm_walk stack_walk
= {
373 .pmd_entry
= stack_usage_pte_range
,
378 if (!vma
->vm_mm
|| is_vm_hugetlb_page(vma
))
382 ss
.startpage
= task
->stack_start
& PAGE_MASK
;
385 #ifdef CONFIG_STACK_GROWSUP
386 walk_page_range(KSTK_ESP(task
) & PAGE_MASK
, vma
->vm_end
,
389 walk_page_range(vma
->vm_start
, (KSTK_ESP(task
) & PAGE_MASK
) + PAGE_SIZE
,
395 static inline void task_show_stack_usage(struct seq_file
*m
,
396 struct task_struct
*task
)
398 struct vm_area_struct
*vma
;
399 struct mm_struct
*mm
= get_task_mm(task
);
402 down_read(&mm
->mmap_sem
);
403 vma
= find_vma(mm
, task
->stack_start
);
405 seq_printf(m
, "Stack usage:\t%lu kB\n",
406 get_stack_usage_in_bytes(vma
, task
) >> 10);
408 up_read(&mm
->mmap_sem
);
413 static void task_show_stack_usage(struct seq_file
*m
, struct task_struct
*task
)
416 #endif /* CONFIG_MMU */
418 static void task_cpus_allowed(struct seq_file
*m
, struct task_struct
*task
)
420 seq_printf(m
, "Cpus_allowed:\t");
421 seq_cpumask(m
, &task
->cpus_allowed
);
423 seq_printf(m
, "Cpus_allowed_list:\t");
424 seq_cpumask_list(m
, &task
->cpus_allowed
);
428 int proc_pid_status(struct seq_file
*m
, struct pid_namespace
*ns
,
429 struct pid
*pid
, struct task_struct
*task
)
431 struct mm_struct
*mm
= get_task_mm(task
);
434 task_state(m
, ns
, pid
, task
);
442 task_cpus_allowed(m
, task
);
443 cpuset_task_status_allowed(m
, task
);
444 #if defined(CONFIG_S390)
445 task_show_regs(m
, task
);
447 task_context_switch_counts(m
, task
);
448 task_show_stack_usage(m
, task
);
452 static int do_task_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
453 struct pid
*pid
, struct task_struct
*task
, int whole
)
455 unsigned long vsize
, eip
, esp
, wchan
= ~0UL;
457 int tty_pgrp
= -1, tty_nr
= 0;
458 sigset_t sigign
, sigcatch
;
460 pid_t ppid
= 0, pgid
= -1, sid
= -1;
463 struct mm_struct
*mm
;
464 unsigned long long start_time
;
465 unsigned long cmin_flt
= 0, cmaj_flt
= 0;
466 unsigned long min_flt
= 0, maj_flt
= 0;
467 cputime_t cutime
, cstime
, utime
, stime
;
468 cputime_t cgtime
, gtime
;
469 unsigned long rsslim
= 0;
470 char tcomm
[sizeof(task
->comm
)];
473 state
= *get_task_state(task
);
474 vsize
= eip
= esp
= 0;
475 permitted
= ptrace_may_access(task
, PTRACE_MODE_READ
);
476 mm
= get_task_mm(task
);
478 vsize
= task_vsize(mm
);
480 eip
= KSTK_EIP(task
);
481 esp
= KSTK_ESP(task
);
485 get_task_comm(tcomm
, task
);
487 sigemptyset(&sigign
);
488 sigemptyset(&sigcatch
);
489 cutime
= cstime
= utime
= stime
= cputime_zero
;
490 cgtime
= gtime
= cputime_zero
;
492 if (lock_task_sighand(task
, &flags
)) {
493 struct signal_struct
*sig
= task
->signal
;
496 struct pid
*pgrp
= tty_get_pgrp(sig
->tty
);
497 tty_pgrp
= pid_nr_ns(pgrp
, ns
);
499 tty_nr
= new_encode_dev(tty_devnum(sig
->tty
));
502 num_threads
= atomic_read(&sig
->count
);
503 collect_sigign_sigcatch(task
, &sigign
, &sigcatch
);
505 cmin_flt
= sig
->cmin_flt
;
506 cmaj_flt
= sig
->cmaj_flt
;
507 cutime
= sig
->cutime
;
508 cstime
= sig
->cstime
;
509 cgtime
= sig
->cgtime
;
510 rsslim
= sig
->rlim
[RLIMIT_RSS
].rlim_cur
;
512 /* add up live thread stats at the group level */
514 struct task_struct
*t
= task
;
516 min_flt
+= t
->min_flt
;
517 maj_flt
+= t
->maj_flt
;
518 gtime
= cputime_add(gtime
, t
->gtime
);
522 min_flt
+= sig
->min_flt
;
523 maj_flt
+= sig
->maj_flt
;
524 thread_group_times(task
, &utime
, &stime
);
525 gtime
= cputime_add(gtime
, sig
->gtime
);
528 sid
= task_session_nr_ns(task
, ns
);
529 ppid
= task_tgid_nr_ns(task
->real_parent
, ns
);
530 pgid
= task_pgrp_nr_ns(task
, ns
);
532 unlock_task_sighand(task
, &flags
);
535 if (permitted
&& (!whole
|| num_threads
< 2))
536 wchan
= get_wchan(task
);
538 min_flt
= task
->min_flt
;
539 maj_flt
= task
->maj_flt
;
540 task_times(task
, &utime
, &stime
);
544 /* scale priority and nice values from timeslices to -20..20 */
545 /* to make it look like a "normal" Unix priority/nice value */
546 priority
= task_prio(task
);
547 nice
= task_nice(task
);
549 /* Temporary variable needed for gcc-2.96 */
550 /* convert timespec -> nsec*/
552 (unsigned long long)task
->real_start_time
.tv_sec
* NSEC_PER_SEC
553 + task
->real_start_time
.tv_nsec
;
554 /* convert nsec -> ticks */
555 start_time
= nsec_to_clock_t(start_time
);
557 seq_printf(m
, "%d (%s) %c %d %d %d %d %d %u %lu \
558 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
559 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
573 cputime_to_clock_t(utime
),
574 cputime_to_clock_t(stime
),
575 cputime_to_clock_t(cutime
),
576 cputime_to_clock_t(cstime
),
582 mm
? get_mm_rss(mm
) : 0,
584 mm
? mm
->start_code
: 0,
585 mm
? mm
->end_code
: 0,
586 (permitted
&& mm
) ? task
->stack_start
: 0,
589 /* The signal information here is obsolete.
590 * It must be decimal for Linux 2.0 compatibility.
591 * Use /proc/#/status for real-time signals.
593 task
->pending
.signal
.sig
[0] & 0x7fffffffUL
,
594 task
->blocked
.sig
[0] & 0x7fffffffUL
,
595 sigign
.sig
[0] & 0x7fffffffUL
,
596 sigcatch
.sig
[0] & 0x7fffffffUL
,
604 (unsigned long long)delayacct_blkio_ticks(task
),
605 cputime_to_clock_t(gtime
),
606 cputime_to_clock_t(cgtime
));
612 int proc_tid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
613 struct pid
*pid
, struct task_struct
*task
)
615 return do_task_stat(m
, ns
, pid
, task
, 0);
618 int proc_tgid_stat(struct seq_file
*m
, struct pid_namespace
*ns
,
619 struct pid
*pid
, struct task_struct
*task
)
621 return do_task_stat(m
, ns
, pid
, task
, 1);
624 int proc_pid_statm(struct seq_file
*m
, struct pid_namespace
*ns
,
625 struct pid
*pid
, struct task_struct
*task
)
627 int size
= 0, resident
= 0, shared
= 0, text
= 0, lib
= 0, data
= 0;
628 struct mm_struct
*mm
= get_task_mm(task
);
631 size
= task_statm(mm
, &shared
, &text
, &data
, &resident
);
634 seq_printf(m
, "%d %d %d %d %d %d %d\n",
635 size
, resident
, shared
, text
, lib
, data
, 0);