Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Implement CPU time clocks for the POSIX clock interface. | |
3 | */ | |
4 | ||
5 | #include <linux/sched.h> | |
6 | #include <linux/posix-timers.h> | |
1da177e4 | 7 | #include <linux/errno.h> |
f8bd2258 RZ |
8 | #include <linux/math64.h> |
9 | #include <asm/uaccess.h> | |
bb34d92f | 10 | #include <linux/kernel_stat.h> |
3f0a525e | 11 | #include <trace/events/timer.h> |
61337054 | 12 | #include <linux/random.h> |
1da177e4 | 13 | |
f06febc9 | 14 | /* |
f55db609 SG |
15 | * Called after updating RLIMIT_CPU to run cpu timer and update |
16 | * tsk->signal->cputime_expires expiration cache if necessary. Needs | |
17 | * siglock protection since other code may update expiration cache as | |
18 | * well. | |
f06febc9 | 19 | */ |
5ab46b34 | 20 | void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new) |
f06febc9 | 21 | { |
42c4ab41 | 22 | cputime_t cputime = secs_to_cputime(rlim_new); |
f06febc9 | 23 | |
5ab46b34 JS |
24 | spin_lock_irq(&task->sighand->siglock); |
25 | set_process_cpu_timer(task, CPUCLOCK_PROF, &cputime, NULL); | |
26 | spin_unlock_irq(&task->sighand->siglock); | |
f06febc9 FM |
27 | } |
28 | ||
a924b04d | 29 | static int check_clock(const clockid_t which_clock) |
1da177e4 LT |
30 | { |
31 | int error = 0; | |
32 | struct task_struct *p; | |
33 | const pid_t pid = CPUCLOCK_PID(which_clock); | |
34 | ||
35 | if (CPUCLOCK_WHICH(which_clock) >= CPUCLOCK_MAX) | |
36 | return -EINVAL; | |
37 | ||
38 | if (pid == 0) | |
39 | return 0; | |
40 | ||
c0deae8c | 41 | rcu_read_lock(); |
8dc86af0 | 42 | p = find_task_by_vpid(pid); |
bac0abd6 | 43 | if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ? |
c0deae8c | 44 | same_thread_group(p, current) : has_group_leader_pid(p))) { |
1da177e4 LT |
45 | error = -EINVAL; |
46 | } | |
c0deae8c | 47 | rcu_read_unlock(); |
1da177e4 LT |
48 | |
49 | return error; | |
50 | } | |
51 | ||
52 | static inline union cpu_time_count | |
a924b04d | 53 | timespec_to_sample(const clockid_t which_clock, const struct timespec *tp) |
1da177e4 LT |
54 | { |
55 | union cpu_time_count ret; | |
56 | ret.sched = 0; /* high half always zero when .cpu used */ | |
57 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { | |
ee500f27 | 58 | ret.sched = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec; |
1da177e4 LT |
59 | } else { |
60 | ret.cpu = timespec_to_cputime(tp); | |
61 | } | |
62 | return ret; | |
63 | } | |
64 | ||
a924b04d | 65 | static void sample_to_timespec(const clockid_t which_clock, |
1da177e4 LT |
66 | union cpu_time_count cpu, |
67 | struct timespec *tp) | |
68 | { | |
f8bd2258 RZ |
69 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) |
70 | *tp = ns_to_timespec(cpu.sched); | |
71 | else | |
1da177e4 | 72 | cputime_to_timespec(cpu.cpu, tp); |
1da177e4 LT |
73 | } |
74 | ||
a924b04d | 75 | static inline int cpu_time_before(const clockid_t which_clock, |
1da177e4 LT |
76 | union cpu_time_count now, |
77 | union cpu_time_count then) | |
78 | { | |
79 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { | |
80 | return now.sched < then.sched; | |
81 | } else { | |
64861634 | 82 | return now.cpu < then.cpu; |
1da177e4 LT |
83 | } |
84 | } | |
a924b04d | 85 | static inline void cpu_time_add(const clockid_t which_clock, |
1da177e4 LT |
86 | union cpu_time_count *acc, |
87 | union cpu_time_count val) | |
88 | { | |
89 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { | |
90 | acc->sched += val.sched; | |
91 | } else { | |
64861634 | 92 | acc->cpu += val.cpu; |
1da177e4 LT |
93 | } |
94 | } | |
a924b04d | 95 | static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock, |
1da177e4 LT |
96 | union cpu_time_count a, |
97 | union cpu_time_count b) | |
98 | { | |
99 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { | |
100 | a.sched -= b.sched; | |
101 | } else { | |
64861634 | 102 | a.cpu -= b.cpu; |
1da177e4 LT |
103 | } |
104 | return a; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Update expiry time from increment, and increase overrun count, | |
109 | * given the current clock sample. | |
110 | */ | |
7a4ed937 | 111 | static void bump_cpu_timer(struct k_itimer *timer, |
1da177e4 LT |
112 | union cpu_time_count now) |
113 | { | |
114 | int i; | |
115 | ||
116 | if (timer->it.cpu.incr.sched == 0) | |
117 | return; | |
118 | ||
119 | if (CPUCLOCK_WHICH(timer->it_clock) == CPUCLOCK_SCHED) { | |
120 | unsigned long long delta, incr; | |
121 | ||
122 | if (now.sched < timer->it.cpu.expires.sched) | |
123 | return; | |
124 | incr = timer->it.cpu.incr.sched; | |
125 | delta = now.sched + incr - timer->it.cpu.expires.sched; | |
126 | /* Don't use (incr*2 < delta), incr*2 might overflow. */ | |
127 | for (i = 0; incr < delta - incr; i++) | |
128 | incr = incr << 1; | |
129 | for (; i >= 0; incr >>= 1, i--) { | |
7a4ed937 | 130 | if (delta < incr) |
1da177e4 LT |
131 | continue; |
132 | timer->it.cpu.expires.sched += incr; | |
133 | timer->it_overrun += 1 << i; | |
134 | delta -= incr; | |
135 | } | |
136 | } else { | |
137 | cputime_t delta, incr; | |
138 | ||
64861634 | 139 | if (now.cpu < timer->it.cpu.expires.cpu) |
1da177e4 LT |
140 | return; |
141 | incr = timer->it.cpu.incr.cpu; | |
64861634 | 142 | delta = now.cpu + incr - timer->it.cpu.expires.cpu; |
1da177e4 | 143 | /* Don't use (incr*2 < delta), incr*2 might overflow. */ |
64861634 MS |
144 | for (i = 0; incr < delta - incr; i++) |
145 | incr += incr; | |
146 | for (; i >= 0; incr = incr >> 1, i--) { | |
147 | if (delta < incr) | |
1da177e4 | 148 | continue; |
64861634 | 149 | timer->it.cpu.expires.cpu += incr; |
1da177e4 | 150 | timer->it_overrun += 1 << i; |
64861634 | 151 | delta -= incr; |
1da177e4 LT |
152 | } |
153 | } | |
154 | } | |
155 | ||
156 | static inline cputime_t prof_ticks(struct task_struct *p) | |
157 | { | |
64861634 | 158 | return p->utime + p->stime; |
1da177e4 LT |
159 | } |
160 | static inline cputime_t virt_ticks(struct task_struct *p) | |
161 | { | |
162 | return p->utime; | |
163 | } | |
1da177e4 | 164 | |
bc2c8ea4 TG |
165 | static int |
166 | posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) | |
1da177e4 LT |
167 | { |
168 | int error = check_clock(which_clock); | |
169 | if (!error) { | |
170 | tp->tv_sec = 0; | |
171 | tp->tv_nsec = ((NSEC_PER_SEC + HZ - 1) / HZ); | |
172 | if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { | |
173 | /* | |
174 | * If sched_clock is using a cycle counter, we | |
175 | * don't have any idea of its true resolution | |
176 | * exported, but it is much more than 1s/HZ. | |
177 | */ | |
178 | tp->tv_nsec = 1; | |
179 | } | |
180 | } | |
181 | return error; | |
182 | } | |
183 | ||
bc2c8ea4 TG |
184 | static int |
185 | posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp) | |
1da177e4 LT |
186 | { |
187 | /* | |
188 | * You can never reset a CPU clock, but we check for other errors | |
189 | * in the call before failing with EPERM. | |
190 | */ | |
191 | int error = check_clock(which_clock); | |
192 | if (error == 0) { | |
193 | error = -EPERM; | |
194 | } | |
195 | return error; | |
196 | } | |
197 | ||
198 | ||
199 | /* | |
200 | * Sample a per-thread clock for the given task. | |
201 | */ | |
a924b04d | 202 | static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p, |
1da177e4 LT |
203 | union cpu_time_count *cpu) |
204 | { | |
205 | switch (CPUCLOCK_WHICH(which_clock)) { | |
206 | default: | |
207 | return -EINVAL; | |
208 | case CPUCLOCK_PROF: | |
209 | cpu->cpu = prof_ticks(p); | |
210 | break; | |
211 | case CPUCLOCK_VIRT: | |
212 | cpu->cpu = virt_ticks(p); | |
213 | break; | |
214 | case CPUCLOCK_SCHED: | |
c5f8d995 | 215 | cpu->sched = task_sched_runtime(p); |
1da177e4 LT |
216 | break; |
217 | } | |
218 | return 0; | |
219 | } | |
220 | ||
4da94d49 PZ |
221 | static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b) |
222 | { | |
64861634 | 223 | if (b->utime > a->utime) |
4da94d49 PZ |
224 | a->utime = b->utime; |
225 | ||
64861634 | 226 | if (b->stime > a->stime) |
4da94d49 PZ |
227 | a->stime = b->stime; |
228 | ||
229 | if (b->sum_exec_runtime > a->sum_exec_runtime) | |
230 | a->sum_exec_runtime = b->sum_exec_runtime; | |
231 | } | |
232 | ||
233 | void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times) | |
234 | { | |
235 | struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; | |
236 | struct task_cputime sum; | |
237 | unsigned long flags; | |
238 | ||
4da94d49 | 239 | if (!cputimer->running) { |
4da94d49 PZ |
240 | /* |
241 | * The POSIX timer interface allows for absolute time expiry | |
242 | * values through the TIMER_ABSTIME flag, therefore we have | |
243 | * to synchronize the timer to the clock every time we start | |
244 | * it. | |
245 | */ | |
246 | thread_group_cputime(tsk, &sum); | |
3cfef952 | 247 | raw_spin_lock_irqsave(&cputimer->lock, flags); |
bcd5cff7 | 248 | cputimer->running = 1; |
4da94d49 | 249 | update_gt_cputime(&cputimer->cputime, &sum); |
bcd5cff7 | 250 | } else |
3cfef952 | 251 | raw_spin_lock_irqsave(&cputimer->lock, flags); |
4da94d49 | 252 | *times = cputimer->cputime; |
ee30a7b2 | 253 | raw_spin_unlock_irqrestore(&cputimer->lock, flags); |
4da94d49 PZ |
254 | } |
255 | ||
1da177e4 LT |
256 | /* |
257 | * Sample a process (thread group) clock for the given group_leader task. | |
258 | * Must be called with tasklist_lock held for reading. | |
1da177e4 | 259 | */ |
bb34d92f FM |
260 | static int cpu_clock_sample_group(const clockid_t which_clock, |
261 | struct task_struct *p, | |
262 | union cpu_time_count *cpu) | |
1da177e4 | 263 | { |
f06febc9 FM |
264 | struct task_cputime cputime; |
265 | ||
eccdaeaf | 266 | switch (CPUCLOCK_WHICH(which_clock)) { |
1da177e4 LT |
267 | default: |
268 | return -EINVAL; | |
269 | case CPUCLOCK_PROF: | |
c5f8d995 | 270 | thread_group_cputime(p, &cputime); |
64861634 | 271 | cpu->cpu = cputime.utime + cputime.stime; |
1da177e4 LT |
272 | break; |
273 | case CPUCLOCK_VIRT: | |
c5f8d995 | 274 | thread_group_cputime(p, &cputime); |
f06febc9 | 275 | cpu->cpu = cputime.utime; |
1da177e4 LT |
276 | break; |
277 | case CPUCLOCK_SCHED: | |
d670ec13 PZ |
278 | thread_group_cputime(p, &cputime); |
279 | cpu->sched = cputime.sum_exec_runtime; | |
1da177e4 LT |
280 | break; |
281 | } | |
282 | return 0; | |
283 | } | |
284 | ||
1da177e4 | 285 | |
bc2c8ea4 | 286 | static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
1da177e4 LT |
287 | { |
288 | const pid_t pid = CPUCLOCK_PID(which_clock); | |
289 | int error = -EINVAL; | |
290 | union cpu_time_count rtn; | |
291 | ||
292 | if (pid == 0) { | |
293 | /* | |
294 | * Special case constant value for our own clocks. | |
295 | * We don't have to do any lookup to find ourselves. | |
296 | */ | |
297 | if (CPUCLOCK_PERTHREAD(which_clock)) { | |
298 | /* | |
299 | * Sampling just ourselves we can do with no locking. | |
300 | */ | |
301 | error = cpu_clock_sample(which_clock, | |
302 | current, &rtn); | |
303 | } else { | |
304 | read_lock(&tasklist_lock); | |
305 | error = cpu_clock_sample_group(which_clock, | |
306 | current, &rtn); | |
307 | read_unlock(&tasklist_lock); | |
308 | } | |
309 | } else { | |
310 | /* | |
311 | * Find the given PID, and validate that the caller | |
312 | * should be able to see it. | |
313 | */ | |
314 | struct task_struct *p; | |
1f2ea083 | 315 | rcu_read_lock(); |
8dc86af0 | 316 | p = find_task_by_vpid(pid); |
1da177e4 LT |
317 | if (p) { |
318 | if (CPUCLOCK_PERTHREAD(which_clock)) { | |
bac0abd6 | 319 | if (same_thread_group(p, current)) { |
1da177e4 LT |
320 | error = cpu_clock_sample(which_clock, |
321 | p, &rtn); | |
322 | } | |
1f2ea083 PM |
323 | } else { |
324 | read_lock(&tasklist_lock); | |
d30fda35 | 325 | if (thread_group_leader(p) && p->sighand) { |
1f2ea083 PM |
326 | error = |
327 | cpu_clock_sample_group(which_clock, | |
328 | p, &rtn); | |
329 | } | |
330 | read_unlock(&tasklist_lock); | |
1da177e4 LT |
331 | } |
332 | } | |
1f2ea083 | 333 | rcu_read_unlock(); |
1da177e4 LT |
334 | } |
335 | ||
336 | if (error) | |
337 | return error; | |
338 | sample_to_timespec(which_clock, rtn, tp); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | ||
343 | /* | |
344 | * Validate the clockid_t for a new CPU-clock timer, and initialize the timer. | |
ba5ea951 SG |
345 | * This is called from sys_timer_create() and do_cpu_nanosleep() with the |
346 | * new timer already all-zeros initialized. | |
1da177e4 | 347 | */ |
bc2c8ea4 | 348 | static int posix_cpu_timer_create(struct k_itimer *new_timer) |
1da177e4 LT |
349 | { |
350 | int ret = 0; | |
351 | const pid_t pid = CPUCLOCK_PID(new_timer->it_clock); | |
352 | struct task_struct *p; | |
353 | ||
354 | if (CPUCLOCK_WHICH(new_timer->it_clock) >= CPUCLOCK_MAX) | |
355 | return -EINVAL; | |
356 | ||
357 | INIT_LIST_HEAD(&new_timer->it.cpu.entry); | |
1da177e4 | 358 | |
c0deae8c | 359 | rcu_read_lock(); |
1da177e4 LT |
360 | if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) { |
361 | if (pid == 0) { | |
362 | p = current; | |
363 | } else { | |
8dc86af0 | 364 | p = find_task_by_vpid(pid); |
bac0abd6 | 365 | if (p && !same_thread_group(p, current)) |
1da177e4 LT |
366 | p = NULL; |
367 | } | |
368 | } else { | |
369 | if (pid == 0) { | |
370 | p = current->group_leader; | |
371 | } else { | |
8dc86af0 | 372 | p = find_task_by_vpid(pid); |
c0deae8c | 373 | if (p && !has_group_leader_pid(p)) |
1da177e4 LT |
374 | p = NULL; |
375 | } | |
376 | } | |
377 | new_timer->it.cpu.task = p; | |
378 | if (p) { | |
379 | get_task_struct(p); | |
380 | } else { | |
381 | ret = -EINVAL; | |
382 | } | |
c0deae8c | 383 | rcu_read_unlock(); |
1da177e4 LT |
384 | |
385 | return ret; | |
386 | } | |
387 | ||
388 | /* | |
389 | * Clean up a CPU-clock timer that is about to be destroyed. | |
390 | * This is called from timer deletion with the timer already locked. | |
391 | * If we return TIMER_RETRY, it's necessary to release the timer's lock | |
392 | * and try again. (This happens when the timer is in the middle of firing.) | |
393 | */ | |
bc2c8ea4 | 394 | static int posix_cpu_timer_del(struct k_itimer *timer) |
1da177e4 LT |
395 | { |
396 | struct task_struct *p = timer->it.cpu.task; | |
108150ea | 397 | int ret = 0; |
1da177e4 | 398 | |
108150ea | 399 | if (likely(p != NULL)) { |
9465bee8 | 400 | read_lock(&tasklist_lock); |
d30fda35 | 401 | if (unlikely(p->sighand == NULL)) { |
9465bee8 LT |
402 | /* |
403 | * We raced with the reaping of the task. | |
404 | * The deletion should have cleared us off the list. | |
405 | */ | |
406 | BUG_ON(!list_empty(&timer->it.cpu.entry)); | |
407 | } else { | |
9465bee8 | 408 | spin_lock(&p->sighand->siglock); |
108150ea ON |
409 | if (timer->it.cpu.firing) |
410 | ret = TIMER_RETRY; | |
411 | else | |
412 | list_del(&timer->it.cpu.entry); | |
9465bee8 LT |
413 | spin_unlock(&p->sighand->siglock); |
414 | } | |
415 | read_unlock(&tasklist_lock); | |
108150ea ON |
416 | |
417 | if (!ret) | |
418 | put_task_struct(p); | |
1da177e4 | 419 | } |
1da177e4 | 420 | |
108150ea | 421 | return ret; |
1da177e4 LT |
422 | } |
423 | ||
424 | /* | |
425 | * Clean out CPU timers still ticking when a thread exited. The task | |
426 | * pointer is cleared, and the expiry time is replaced with the residual | |
427 | * time for later timer_gettime calls to return. | |
428 | * This must be called with the siglock held. | |
429 | */ | |
430 | static void cleanup_timers(struct list_head *head, | |
431 | cputime_t utime, cputime_t stime, | |
41b86e9c | 432 | unsigned long long sum_exec_runtime) |
1da177e4 LT |
433 | { |
434 | struct cpu_timer_list *timer, *next; | |
64861634 | 435 | cputime_t ptime = utime + stime; |
1da177e4 LT |
436 | |
437 | list_for_each_entry_safe(timer, next, head, entry) { | |
1da177e4 | 438 | list_del_init(&timer->entry); |
64861634 MS |
439 | if (timer->expires.cpu < ptime) { |
440 | timer->expires.cpu = 0; | |
1da177e4 | 441 | } else { |
64861634 | 442 | timer->expires.cpu -= ptime; |
1da177e4 LT |
443 | } |
444 | } | |
445 | ||
446 | ++head; | |
447 | list_for_each_entry_safe(timer, next, head, entry) { | |
1da177e4 | 448 | list_del_init(&timer->entry); |
64861634 MS |
449 | if (timer->expires.cpu < utime) { |
450 | timer->expires.cpu = 0; | |
1da177e4 | 451 | } else { |
64861634 | 452 | timer->expires.cpu -= utime; |
1da177e4 LT |
453 | } |
454 | } | |
455 | ||
456 | ++head; | |
457 | list_for_each_entry_safe(timer, next, head, entry) { | |
1da177e4 | 458 | list_del_init(&timer->entry); |
41b86e9c | 459 | if (timer->expires.sched < sum_exec_runtime) { |
1da177e4 LT |
460 | timer->expires.sched = 0; |
461 | } else { | |
41b86e9c | 462 | timer->expires.sched -= sum_exec_runtime; |
1da177e4 LT |
463 | } |
464 | } | |
465 | } | |
466 | ||
467 | /* | |
468 | * These are both called with the siglock held, when the current thread | |
469 | * is being reaped. When the final (leader) thread in the group is reaped, | |
470 | * posix_cpu_timers_exit_group will be called after posix_cpu_timers_exit. | |
471 | */ | |
472 | void posix_cpu_timers_exit(struct task_struct *tsk) | |
473 | { | |
61337054 NK |
474 | add_device_randomness((const void*) &tsk->se.sum_exec_runtime, |
475 | sizeof(unsigned long long)); | |
1da177e4 | 476 | cleanup_timers(tsk->cpu_timers, |
41b86e9c | 477 | tsk->utime, tsk->stime, tsk->se.sum_exec_runtime); |
1da177e4 LT |
478 | |
479 | } | |
480 | void posix_cpu_timers_exit_group(struct task_struct *tsk) | |
481 | { | |
17d42c1c | 482 | struct signal_struct *const sig = tsk->signal; |
ca531a0a | 483 | |
f06febc9 | 484 | cleanup_timers(tsk->signal->cpu_timers, |
64861634 | 485 | tsk->utime + sig->utime, tsk->stime + sig->stime, |
17d42c1c | 486 | tsk->se.sum_exec_runtime + sig->sum_sched_runtime); |
1da177e4 LT |
487 | } |
488 | ||
489 | static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now) | |
490 | { | |
491 | /* | |
492 | * That's all for this thread or process. | |
493 | * We leave our residual in expires to be reported. | |
494 | */ | |
495 | put_task_struct(timer->it.cpu.task); | |
496 | timer->it.cpu.task = NULL; | |
497 | timer->it.cpu.expires = cpu_time_sub(timer->it_clock, | |
498 | timer->it.cpu.expires, | |
499 | now); | |
500 | } | |
501 | ||
d1e3b6d1 SG |
502 | static inline int expires_gt(cputime_t expires, cputime_t new_exp) |
503 | { | |
64861634 | 504 | return expires == 0 || expires > new_exp; |
d1e3b6d1 SG |
505 | } |
506 | ||
1da177e4 LT |
507 | /* |
508 | * Insert the timer on the appropriate list before any timers that | |
509 | * expire later. This must be called with the tasklist_lock held | |
c2873937 | 510 | * for reading, interrupts disabled and p->sighand->siglock taken. |
1da177e4 | 511 | */ |
5eb9aa64 | 512 | static void arm_timer(struct k_itimer *timer) |
1da177e4 LT |
513 | { |
514 | struct task_struct *p = timer->it.cpu.task; | |
515 | struct list_head *head, *listpos; | |
5eb9aa64 | 516 | struct task_cputime *cputime_expires; |
1da177e4 LT |
517 | struct cpu_timer_list *const nt = &timer->it.cpu; |
518 | struct cpu_timer_list *next; | |
1da177e4 | 519 | |
5eb9aa64 SG |
520 | if (CPUCLOCK_PERTHREAD(timer->it_clock)) { |
521 | head = p->cpu_timers; | |
522 | cputime_expires = &p->cputime_expires; | |
523 | } else { | |
524 | head = p->signal->cpu_timers; | |
525 | cputime_expires = &p->signal->cputime_expires; | |
526 | } | |
1da177e4 LT |
527 | head += CPUCLOCK_WHICH(timer->it_clock); |
528 | ||
1da177e4 | 529 | listpos = head; |
5eb9aa64 SG |
530 | list_for_each_entry(next, head, entry) { |
531 | if (cpu_time_before(timer->it_clock, nt->expires, next->expires)) | |
532 | break; | |
533 | listpos = &next->entry; | |
1da177e4 LT |
534 | } |
535 | list_add(&nt->entry, listpos); | |
536 | ||
537 | if (listpos == head) { | |
5eb9aa64 SG |
538 | union cpu_time_count *exp = &nt->expires; |
539 | ||
1da177e4 | 540 | /* |
5eb9aa64 SG |
541 | * We are the new earliest-expiring POSIX 1.b timer, hence |
542 | * need to update expiration cache. Take into account that | |
543 | * for process timers we share expiration cache with itimers | |
544 | * and RLIMIT_CPU and for thread timers with RLIMIT_RTTIME. | |
1da177e4 LT |
545 | */ |
546 | ||
5eb9aa64 SG |
547 | switch (CPUCLOCK_WHICH(timer->it_clock)) { |
548 | case CPUCLOCK_PROF: | |
549 | if (expires_gt(cputime_expires->prof_exp, exp->cpu)) | |
550 | cputime_expires->prof_exp = exp->cpu; | |
551 | break; | |
552 | case CPUCLOCK_VIRT: | |
553 | if (expires_gt(cputime_expires->virt_exp, exp->cpu)) | |
554 | cputime_expires->virt_exp = exp->cpu; | |
555 | break; | |
556 | case CPUCLOCK_SCHED: | |
557 | if (cputime_expires->sched_exp == 0 || | |
558 | cputime_expires->sched_exp > exp->sched) | |
559 | cputime_expires->sched_exp = exp->sched; | |
560 | break; | |
1da177e4 LT |
561 | } |
562 | } | |
1da177e4 LT |
563 | } |
564 | ||
565 | /* | |
566 | * The timer is locked, fire it and arrange for its reload. | |
567 | */ | |
568 | static void cpu_timer_fire(struct k_itimer *timer) | |
569 | { | |
1f169f84 SG |
570 | if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) { |
571 | /* | |
572 | * User don't want any signal. | |
573 | */ | |
574 | timer->it.cpu.expires.sched = 0; | |
575 | } else if (unlikely(timer->sigq == NULL)) { | |
1da177e4 LT |
576 | /* |
577 | * This a special case for clock_nanosleep, | |
578 | * not a normal timer from sys_timer_create. | |
579 | */ | |
580 | wake_up_process(timer->it_process); | |
581 | timer->it.cpu.expires.sched = 0; | |
582 | } else if (timer->it.cpu.incr.sched == 0) { | |
583 | /* | |
584 | * One-shot timer. Clear it as soon as it's fired. | |
585 | */ | |
586 | posix_timer_event(timer, 0); | |
587 | timer->it.cpu.expires.sched = 0; | |
588 | } else if (posix_timer_event(timer, ++timer->it_requeue_pending)) { | |
589 | /* | |
590 | * The signal did not get queued because the signal | |
591 | * was ignored, so we won't get any callback to | |
592 | * reload the timer. But we need to keep it | |
593 | * ticking in case the signal is deliverable next time. | |
594 | */ | |
595 | posix_cpu_timer_schedule(timer); | |
596 | } | |
597 | } | |
598 | ||
3997ad31 PZ |
599 | /* |
600 | * Sample a process (thread group) timer for the given group_leader task. | |
601 | * Must be called with tasklist_lock held for reading. | |
602 | */ | |
603 | static int cpu_timer_sample_group(const clockid_t which_clock, | |
604 | struct task_struct *p, | |
605 | union cpu_time_count *cpu) | |
606 | { | |
607 | struct task_cputime cputime; | |
608 | ||
609 | thread_group_cputimer(p, &cputime); | |
610 | switch (CPUCLOCK_WHICH(which_clock)) { | |
611 | default: | |
612 | return -EINVAL; | |
613 | case CPUCLOCK_PROF: | |
64861634 | 614 | cpu->cpu = cputime.utime + cputime.stime; |
3997ad31 PZ |
615 | break; |
616 | case CPUCLOCK_VIRT: | |
617 | cpu->cpu = cputime.utime; | |
618 | break; | |
619 | case CPUCLOCK_SCHED: | |
620 | cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p); | |
621 | break; | |
622 | } | |
623 | return 0; | |
624 | } | |
625 | ||
1da177e4 LT |
626 | /* |
627 | * Guts of sys_timer_settime for CPU timers. | |
628 | * This is called with the timer locked and interrupts disabled. | |
629 | * If we return TIMER_RETRY, it's necessary to release the timer's lock | |
630 | * and try again. (This happens when the timer is in the middle of firing.) | |
631 | */ | |
bc2c8ea4 TG |
632 | static int posix_cpu_timer_set(struct k_itimer *timer, int flags, |
633 | struct itimerspec *new, struct itimerspec *old) | |
1da177e4 LT |
634 | { |
635 | struct task_struct *p = timer->it.cpu.task; | |
ae1a78ee | 636 | union cpu_time_count old_expires, new_expires, old_incr, val; |
1da177e4 LT |
637 | int ret; |
638 | ||
639 | if (unlikely(p == NULL)) { | |
640 | /* | |
641 | * Timer refers to a dead task's clock. | |
642 | */ | |
643 | return -ESRCH; | |
644 | } | |
645 | ||
646 | new_expires = timespec_to_sample(timer->it_clock, &new->it_value); | |
647 | ||
648 | read_lock(&tasklist_lock); | |
649 | /* | |
650 | * We need the tasklist_lock to protect against reaping that | |
d30fda35 | 651 | * clears p->sighand. If p has just been reaped, we can no |
1da177e4 LT |
652 | * longer get any information about it at all. |
653 | */ | |
d30fda35 | 654 | if (unlikely(p->sighand == NULL)) { |
1da177e4 LT |
655 | read_unlock(&tasklist_lock); |
656 | put_task_struct(p); | |
657 | timer->it.cpu.task = NULL; | |
658 | return -ESRCH; | |
659 | } | |
660 | ||
661 | /* | |
662 | * Disarm any old timer after extracting its expiry time. | |
663 | */ | |
664 | BUG_ON(!irqs_disabled()); | |
a69ac4a7 ON |
665 | |
666 | ret = 0; | |
ae1a78ee | 667 | old_incr = timer->it.cpu.incr; |
1da177e4 LT |
668 | spin_lock(&p->sighand->siglock); |
669 | old_expires = timer->it.cpu.expires; | |
a69ac4a7 ON |
670 | if (unlikely(timer->it.cpu.firing)) { |
671 | timer->it.cpu.firing = -1; | |
672 | ret = TIMER_RETRY; | |
673 | } else | |
674 | list_del_init(&timer->it.cpu.entry); | |
1da177e4 LT |
675 | |
676 | /* | |
677 | * We need to sample the current value to convert the new | |
678 | * value from to relative and absolute, and to convert the | |
679 | * old value from absolute to relative. To set a process | |
680 | * timer, we need a sample to balance the thread expiry | |
681 | * times (in arm_timer). With an absolute time, we must | |
682 | * check if it's already passed. In short, we need a sample. | |
683 | */ | |
684 | if (CPUCLOCK_PERTHREAD(timer->it_clock)) { | |
685 | cpu_clock_sample(timer->it_clock, p, &val); | |
686 | } else { | |
3997ad31 | 687 | cpu_timer_sample_group(timer->it_clock, p, &val); |
1da177e4 LT |
688 | } |
689 | ||
690 | if (old) { | |
691 | if (old_expires.sched == 0) { | |
692 | old->it_value.tv_sec = 0; | |
693 | old->it_value.tv_nsec = 0; | |
694 | } else { | |
695 | /* | |
696 | * Update the timer in case it has | |
697 | * overrun already. If it has, | |
698 | * we'll report it as having overrun | |
699 | * and with the next reloaded timer | |
700 | * already ticking, though we are | |
701 | * swallowing that pending | |
702 | * notification here to install the | |
703 | * new setting. | |
704 | */ | |
705 | bump_cpu_timer(timer, val); | |
706 | if (cpu_time_before(timer->it_clock, val, | |
707 | timer->it.cpu.expires)) { | |
708 | old_expires = cpu_time_sub( | |
709 | timer->it_clock, | |
710 | timer->it.cpu.expires, val); | |
711 | sample_to_timespec(timer->it_clock, | |
712 | old_expires, | |
713 | &old->it_value); | |
714 | } else { | |
715 | old->it_value.tv_nsec = 1; | |
716 | old->it_value.tv_sec = 0; | |
717 | } | |
718 | } | |
719 | } | |
720 | ||
a69ac4a7 | 721 | if (unlikely(ret)) { |
1da177e4 LT |
722 | /* |
723 | * We are colliding with the timer actually firing. | |
724 | * Punt after filling in the timer's old value, and | |
725 | * disable this firing since we are already reporting | |
726 | * it as an overrun (thanks to bump_cpu_timer above). | |
727 | */ | |
c2873937 | 728 | spin_unlock(&p->sighand->siglock); |
1da177e4 | 729 | read_unlock(&tasklist_lock); |
1da177e4 LT |
730 | goto out; |
731 | } | |
732 | ||
733 | if (new_expires.sched != 0 && !(flags & TIMER_ABSTIME)) { | |
734 | cpu_time_add(timer->it_clock, &new_expires, val); | |
735 | } | |
736 | ||
737 | /* | |
738 | * Install the new expiry time (or zero). | |
739 | * For a timer with no notification action, we don't actually | |
740 | * arm the timer (we'll just fake it for timer_gettime). | |
741 | */ | |
742 | timer->it.cpu.expires = new_expires; | |
743 | if (new_expires.sched != 0 && | |
1da177e4 | 744 | cpu_time_before(timer->it_clock, val, new_expires)) { |
5eb9aa64 | 745 | arm_timer(timer); |
1da177e4 LT |
746 | } |
747 | ||
c2873937 | 748 | spin_unlock(&p->sighand->siglock); |
1da177e4 LT |
749 | read_unlock(&tasklist_lock); |
750 | ||
751 | /* | |
752 | * Install the new reload setting, and | |
753 | * set up the signal and overrun bookkeeping. | |
754 | */ | |
755 | timer->it.cpu.incr = timespec_to_sample(timer->it_clock, | |
756 | &new->it_interval); | |
757 | ||
758 | /* | |
759 | * This acts as a modification timestamp for the timer, | |
760 | * so any automatic reload attempt will punt on seeing | |
761 | * that we have reset the timer manually. | |
762 | */ | |
763 | timer->it_requeue_pending = (timer->it_requeue_pending + 2) & | |
764 | ~REQUEUE_PENDING; | |
765 | timer->it_overrun_last = 0; | |
766 | timer->it_overrun = -1; | |
767 | ||
768 | if (new_expires.sched != 0 && | |
1da177e4 LT |
769 | !cpu_time_before(timer->it_clock, val, new_expires)) { |
770 | /* | |
771 | * The designated time already passed, so we notify | |
772 | * immediately, even if the thread never runs to | |
773 | * accumulate more time on this clock. | |
774 | */ | |
775 | cpu_timer_fire(timer); | |
776 | } | |
777 | ||
778 | ret = 0; | |
779 | out: | |
780 | if (old) { | |
781 | sample_to_timespec(timer->it_clock, | |
ae1a78ee | 782 | old_incr, &old->it_interval); |
1da177e4 LT |
783 | } |
784 | return ret; | |
785 | } | |
786 | ||
bc2c8ea4 | 787 | static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) |
1da177e4 LT |
788 | { |
789 | union cpu_time_count now; | |
790 | struct task_struct *p = timer->it.cpu.task; | |
791 | int clear_dead; | |
792 | ||
793 | /* | |
794 | * Easy part: convert the reload time. | |
795 | */ | |
796 | sample_to_timespec(timer->it_clock, | |
797 | timer->it.cpu.incr, &itp->it_interval); | |
798 | ||
799 | if (timer->it.cpu.expires.sched == 0) { /* Timer not armed at all. */ | |
800 | itp->it_value.tv_sec = itp->it_value.tv_nsec = 0; | |
801 | return; | |
802 | } | |
803 | ||
804 | if (unlikely(p == NULL)) { | |
805 | /* | |
806 | * This task already died and the timer will never fire. | |
807 | * In this case, expires is actually the dead value. | |
808 | */ | |
809 | dead: | |
810 | sample_to_timespec(timer->it_clock, timer->it.cpu.expires, | |
811 | &itp->it_value); | |
812 | return; | |
813 | } | |
814 | ||
815 | /* | |
816 | * Sample the clock to take the difference with the expiry time. | |
817 | */ | |
818 | if (CPUCLOCK_PERTHREAD(timer->it_clock)) { | |
819 | cpu_clock_sample(timer->it_clock, p, &now); | |
820 | clear_dead = p->exit_state; | |
821 | } else { | |
822 | read_lock(&tasklist_lock); | |
d30fda35 | 823 | if (unlikely(p->sighand == NULL)) { |
1da177e4 LT |
824 | /* |
825 | * The process has been reaped. | |
826 | * We can't even collect a sample any more. | |
827 | * Call the timer disarmed, nothing else to do. | |
828 | */ | |
829 | put_task_struct(p); | |
830 | timer->it.cpu.task = NULL; | |
831 | timer->it.cpu.expires.sched = 0; | |
832 | read_unlock(&tasklist_lock); | |
833 | goto dead; | |
834 | } else { | |
3997ad31 | 835 | cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4 LT |
836 | clear_dead = (unlikely(p->exit_state) && |
837 | thread_group_empty(p)); | |
838 | } | |
839 | read_unlock(&tasklist_lock); | |
840 | } | |
841 | ||
1da177e4 LT |
842 | if (unlikely(clear_dead)) { |
843 | /* | |
844 | * We've noticed that the thread is dead, but | |
845 | * not yet reaped. Take this opportunity to | |
846 | * drop our task ref. | |
847 | */ | |
848 | clear_dead_task(timer, now); | |
849 | goto dead; | |
850 | } | |
851 | ||
852 | if (cpu_time_before(timer->it_clock, now, timer->it.cpu.expires)) { | |
853 | sample_to_timespec(timer->it_clock, | |
854 | cpu_time_sub(timer->it_clock, | |
855 | timer->it.cpu.expires, now), | |
856 | &itp->it_value); | |
857 | } else { | |
858 | /* | |
859 | * The timer should have expired already, but the firing | |
860 | * hasn't taken place yet. Say it's just about to expire. | |
861 | */ | |
862 | itp->it_value.tv_nsec = 1; | |
863 | itp->it_value.tv_sec = 0; | |
864 | } | |
865 | } | |
866 | ||
867 | /* | |
868 | * Check for any per-thread CPU timers that have fired and move them off | |
869 | * the tsk->cpu_timers[N] list onto the firing list. Here we update the | |
870 | * tsk->it_*_expires values to reflect the remaining thread CPU timers. | |
871 | */ | |
872 | static void check_thread_timers(struct task_struct *tsk, | |
873 | struct list_head *firing) | |
874 | { | |
e80eda94 | 875 | int maxfire; |
1da177e4 | 876 | struct list_head *timers = tsk->cpu_timers; |
78f2c7db | 877 | struct signal_struct *const sig = tsk->signal; |
d4bb5274 | 878 | unsigned long soft; |
1da177e4 | 879 | |
e80eda94 | 880 | maxfire = 20; |
64861634 | 881 | tsk->cputime_expires.prof_exp = 0; |
1da177e4 | 882 | while (!list_empty(timers)) { |
b5e61818 | 883 | struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4 LT |
884 | struct cpu_timer_list, |
885 | entry); | |
64861634 | 886 | if (!--maxfire || prof_ticks(tsk) < t->expires.cpu) { |
f06febc9 | 887 | tsk->cputime_expires.prof_exp = t->expires.cpu; |
1da177e4 LT |
888 | break; |
889 | } | |
890 | t->firing = 1; | |
891 | list_move_tail(&t->entry, firing); | |
892 | } | |
893 | ||
894 | ++timers; | |
e80eda94 | 895 | maxfire = 20; |
64861634 | 896 | tsk->cputime_expires.virt_exp = 0; |
1da177e4 | 897 | while (!list_empty(timers)) { |
b5e61818 | 898 | struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4 LT |
899 | struct cpu_timer_list, |
900 | entry); | |
64861634 | 901 | if (!--maxfire || virt_ticks(tsk) < t->expires.cpu) { |
f06febc9 | 902 | tsk->cputime_expires.virt_exp = t->expires.cpu; |
1da177e4 LT |
903 | break; |
904 | } | |
905 | t->firing = 1; | |
906 | list_move_tail(&t->entry, firing); | |
907 | } | |
908 | ||
909 | ++timers; | |
e80eda94 | 910 | maxfire = 20; |
f06febc9 | 911 | tsk->cputime_expires.sched_exp = 0; |
1da177e4 | 912 | while (!list_empty(timers)) { |
b5e61818 | 913 | struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4 LT |
914 | struct cpu_timer_list, |
915 | entry); | |
41b86e9c | 916 | if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) { |
f06febc9 | 917 | tsk->cputime_expires.sched_exp = t->expires.sched; |
1da177e4 LT |
918 | break; |
919 | } | |
920 | t->firing = 1; | |
921 | list_move_tail(&t->entry, firing); | |
922 | } | |
78f2c7db PZ |
923 | |
924 | /* | |
925 | * Check for the special case thread timers. | |
926 | */ | |
78d7d407 | 927 | soft = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur); |
d4bb5274 | 928 | if (soft != RLIM_INFINITY) { |
78d7d407 JS |
929 | unsigned long hard = |
930 | ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max); | |
78f2c7db | 931 | |
5a52dd50 PZ |
932 | if (hard != RLIM_INFINITY && |
933 | tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { | |
78f2c7db PZ |
934 | /* |
935 | * At the hard limit, we just die. | |
936 | * No need to calculate anything else now. | |
937 | */ | |
938 | __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); | |
939 | return; | |
940 | } | |
d4bb5274 | 941 | if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) { |
78f2c7db PZ |
942 | /* |
943 | * At the soft limit, send a SIGXCPU every second. | |
944 | */ | |
d4bb5274 JS |
945 | if (soft < hard) { |
946 | soft += USEC_PER_SEC; | |
947 | sig->rlim[RLIMIT_RTTIME].rlim_cur = soft; | |
78f2c7db | 948 | } |
81d50bb2 HS |
949 | printk(KERN_INFO |
950 | "RT Watchdog Timeout: %s[%d]\n", | |
951 | tsk->comm, task_pid_nr(tsk)); | |
78f2c7db PZ |
952 | __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); |
953 | } | |
954 | } | |
1da177e4 LT |
955 | } |
956 | ||
15365c10 | 957 | static void stop_process_timers(struct signal_struct *sig) |
3fccfd67 | 958 | { |
15365c10 | 959 | struct thread_group_cputimer *cputimer = &sig->cputimer; |
3fccfd67 PZ |
960 | unsigned long flags; |
961 | ||
ee30a7b2 | 962 | raw_spin_lock_irqsave(&cputimer->lock, flags); |
3fccfd67 | 963 | cputimer->running = 0; |
ee30a7b2 | 964 | raw_spin_unlock_irqrestore(&cputimer->lock, flags); |
3fccfd67 PZ |
965 | } |
966 | ||
8356b5f9 SG |
967 | static u32 onecputick; |
968 | ||
42c4ab41 SG |
969 | static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it, |
970 | cputime_t *expires, cputime_t cur_time, int signo) | |
971 | { | |
64861634 | 972 | if (!it->expires) |
42c4ab41 SG |
973 | return; |
974 | ||
64861634 MS |
975 | if (cur_time >= it->expires) { |
976 | if (it->incr) { | |
977 | it->expires += it->incr; | |
8356b5f9 SG |
978 | it->error += it->incr_error; |
979 | if (it->error >= onecputick) { | |
64861634 | 980 | it->expires -= cputime_one_jiffy; |
8356b5f9 SG |
981 | it->error -= onecputick; |
982 | } | |
3f0a525e | 983 | } else { |
64861634 | 984 | it->expires = 0; |
3f0a525e | 985 | } |
42c4ab41 | 986 | |
3f0a525e XG |
987 | trace_itimer_expire(signo == SIGPROF ? |
988 | ITIMER_PROF : ITIMER_VIRTUAL, | |
989 | tsk->signal->leader_pid, cur_time); | |
42c4ab41 SG |
990 | __group_send_sig_info(signo, SEND_SIG_PRIV, tsk); |
991 | } | |
992 | ||
64861634 | 993 | if (it->expires && (!*expires || it->expires < *expires)) { |
42c4ab41 SG |
994 | *expires = it->expires; |
995 | } | |
996 | } | |
997 | ||
29f87b79 SG |
998 | /** |
999 | * task_cputime_zero - Check a task_cputime struct for all zero fields. | |
1000 | * | |
1001 | * @cputime: The struct to compare. | |
1002 | * | |
1003 | * Checks @cputime to see if all fields are zero. Returns true if all fields | |
1004 | * are zero, false if any field is nonzero. | |
1005 | */ | |
1006 | static inline int task_cputime_zero(const struct task_cputime *cputime) | |
1007 | { | |
64861634 | 1008 | if (!cputime->utime && !cputime->stime && !cputime->sum_exec_runtime) |
29f87b79 SG |
1009 | return 1; |
1010 | return 0; | |
1011 | } | |
1012 | ||
1da177e4 LT |
1013 | /* |
1014 | * Check for any per-thread CPU timers that have fired and move them | |
1015 | * off the tsk->*_timers list onto the firing list. Per-thread timers | |
1016 | * have already been taken off. | |
1017 | */ | |
1018 | static void check_process_timers(struct task_struct *tsk, | |
1019 | struct list_head *firing) | |
1020 | { | |
e80eda94 | 1021 | int maxfire; |
1da177e4 | 1022 | struct signal_struct *const sig = tsk->signal; |
f06febc9 | 1023 | cputime_t utime, ptime, virt_expires, prof_expires; |
41b86e9c | 1024 | unsigned long long sum_sched_runtime, sched_expires; |
1da177e4 | 1025 | struct list_head *timers = sig->cpu_timers; |
f06febc9 | 1026 | struct task_cputime cputime; |
d4bb5274 | 1027 | unsigned long soft; |
1da177e4 | 1028 | |
1da177e4 LT |
1029 | /* |
1030 | * Collect the current process totals. | |
1031 | */ | |
4cd4c1b4 | 1032 | thread_group_cputimer(tsk, &cputime); |
f06febc9 | 1033 | utime = cputime.utime; |
64861634 | 1034 | ptime = utime + cputime.stime; |
f06febc9 | 1035 | sum_sched_runtime = cputime.sum_exec_runtime; |
e80eda94 | 1036 | maxfire = 20; |
64861634 | 1037 | prof_expires = 0; |
1da177e4 | 1038 | while (!list_empty(timers)) { |
ee7dd205 | 1039 | struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4 LT |
1040 | struct cpu_timer_list, |
1041 | entry); | |
64861634 | 1042 | if (!--maxfire || ptime < tl->expires.cpu) { |
ee7dd205 | 1043 | prof_expires = tl->expires.cpu; |
1da177e4 LT |
1044 | break; |
1045 | } | |
ee7dd205 WC |
1046 | tl->firing = 1; |
1047 | list_move_tail(&tl->entry, firing); | |
1da177e4 LT |
1048 | } |
1049 | ||
1050 | ++timers; | |
e80eda94 | 1051 | maxfire = 20; |
64861634 | 1052 | virt_expires = 0; |
1da177e4 | 1053 | while (!list_empty(timers)) { |
ee7dd205 | 1054 | struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4 LT |
1055 | struct cpu_timer_list, |
1056 | entry); | |
64861634 | 1057 | if (!--maxfire || utime < tl->expires.cpu) { |
ee7dd205 | 1058 | virt_expires = tl->expires.cpu; |
1da177e4 LT |
1059 | break; |
1060 | } | |
ee7dd205 WC |
1061 | tl->firing = 1; |
1062 | list_move_tail(&tl->entry, firing); | |
1da177e4 LT |
1063 | } |
1064 | ||
1065 | ++timers; | |
e80eda94 | 1066 | maxfire = 20; |
1da177e4 LT |
1067 | sched_expires = 0; |
1068 | while (!list_empty(timers)) { | |
ee7dd205 | 1069 | struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4 LT |
1070 | struct cpu_timer_list, |
1071 | entry); | |
ee7dd205 WC |
1072 | if (!--maxfire || sum_sched_runtime < tl->expires.sched) { |
1073 | sched_expires = tl->expires.sched; | |
1da177e4 LT |
1074 | break; |
1075 | } | |
ee7dd205 WC |
1076 | tl->firing = 1; |
1077 | list_move_tail(&tl->entry, firing); | |
1da177e4 LT |
1078 | } |
1079 | ||
1080 | /* | |
1081 | * Check for the special case process timers. | |
1082 | */ | |
42c4ab41 SG |
1083 | check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_expires, ptime, |
1084 | SIGPROF); | |
1085 | check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime, | |
1086 | SIGVTALRM); | |
78d7d407 | 1087 | soft = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur); |
d4bb5274 | 1088 | if (soft != RLIM_INFINITY) { |
1da177e4 | 1089 | unsigned long psecs = cputime_to_secs(ptime); |
78d7d407 JS |
1090 | unsigned long hard = |
1091 | ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_max); | |
1da177e4 | 1092 | cputime_t x; |
d4bb5274 | 1093 | if (psecs >= hard) { |
1da177e4 LT |
1094 | /* |
1095 | * At the hard limit, we just die. | |
1096 | * No need to calculate anything else now. | |
1097 | */ | |
1098 | __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); | |
1099 | return; | |
1100 | } | |
d4bb5274 | 1101 | if (psecs >= soft) { |
1da177e4 LT |
1102 | /* |
1103 | * At the soft limit, send a SIGXCPU every second. | |
1104 | */ | |
1105 | __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); | |
d4bb5274 JS |
1106 | if (soft < hard) { |
1107 | soft++; | |
1108 | sig->rlim[RLIMIT_CPU].rlim_cur = soft; | |
1da177e4 LT |
1109 | } |
1110 | } | |
d4bb5274 | 1111 | x = secs_to_cputime(soft); |
64861634 | 1112 | if (!prof_expires || x < prof_expires) { |
1da177e4 LT |
1113 | prof_expires = x; |
1114 | } | |
1115 | } | |
1116 | ||
29f87b79 SG |
1117 | sig->cputime_expires.prof_exp = prof_expires; |
1118 | sig->cputime_expires.virt_exp = virt_expires; | |
1119 | sig->cputime_expires.sched_exp = sched_expires; | |
1120 | if (task_cputime_zero(&sig->cputime_expires)) | |
1121 | stop_process_timers(sig); | |
1da177e4 LT |
1122 | } |
1123 | ||
1124 | /* | |
1125 | * This is called from the signal code (via do_schedule_next_timer) | |
1126 | * when the last timer signal was delivered and we have to reload the timer. | |
1127 | */ | |
1128 | void posix_cpu_timer_schedule(struct k_itimer *timer) | |
1129 | { | |
1130 | struct task_struct *p = timer->it.cpu.task; | |
1131 | union cpu_time_count now; | |
1132 | ||
1133 | if (unlikely(p == NULL)) | |
1134 | /* | |
1135 | * The task was cleaned up already, no future firings. | |
1136 | */ | |
708f430d | 1137 | goto out; |
1da177e4 LT |
1138 | |
1139 | /* | |
1140 | * Fetch the current sample and update the timer's expiry time. | |
1141 | */ | |
1142 | if (CPUCLOCK_PERTHREAD(timer->it_clock)) { | |
1143 | cpu_clock_sample(timer->it_clock, p, &now); | |
1144 | bump_cpu_timer(timer, now); | |
1145 | if (unlikely(p->exit_state)) { | |
1146 | clear_dead_task(timer, now); | |
708f430d | 1147 | goto out; |
1da177e4 LT |
1148 | } |
1149 | read_lock(&tasklist_lock); /* arm_timer needs it. */ | |
c2873937 | 1150 | spin_lock(&p->sighand->siglock); |
1da177e4 LT |
1151 | } else { |
1152 | read_lock(&tasklist_lock); | |
d30fda35 | 1153 | if (unlikely(p->sighand == NULL)) { |
1da177e4 LT |
1154 | /* |
1155 | * The process has been reaped. | |
1156 | * We can't even collect a sample any more. | |
1157 | */ | |
1158 | put_task_struct(p); | |
1159 | timer->it.cpu.task = p = NULL; | |
1160 | timer->it.cpu.expires.sched = 0; | |
708f430d | 1161 | goto out_unlock; |
1da177e4 LT |
1162 | } else if (unlikely(p->exit_state) && thread_group_empty(p)) { |
1163 | /* | |
1164 | * We've noticed that the thread is dead, but | |
1165 | * not yet reaped. Take this opportunity to | |
1166 | * drop our task ref. | |
1167 | */ | |
1168 | clear_dead_task(timer, now); | |
708f430d | 1169 | goto out_unlock; |
1da177e4 | 1170 | } |
c2873937 | 1171 | spin_lock(&p->sighand->siglock); |
3997ad31 | 1172 | cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4 LT |
1173 | bump_cpu_timer(timer, now); |
1174 | /* Leave the tasklist_lock locked for the call below. */ | |
1175 | } | |
1176 | ||
1177 | /* | |
1178 | * Now re-arm for the new expiry time. | |
1179 | */ | |
c2873937 | 1180 | BUG_ON(!irqs_disabled()); |
5eb9aa64 | 1181 | arm_timer(timer); |
c2873937 | 1182 | spin_unlock(&p->sighand->siglock); |
1da177e4 | 1183 | |
708f430d | 1184 | out_unlock: |
1da177e4 | 1185 | read_unlock(&tasklist_lock); |
708f430d RM |
1186 | |
1187 | out: | |
1188 | timer->it_overrun_last = timer->it_overrun; | |
1189 | timer->it_overrun = -1; | |
1190 | ++timer->it_requeue_pending; | |
1da177e4 LT |
1191 | } |
1192 | ||
f06febc9 FM |
1193 | /** |
1194 | * task_cputime_expired - Compare two task_cputime entities. | |
1195 | * | |
1196 | * @sample: The task_cputime structure to be checked for expiration. | |
1197 | * @expires: Expiration times, against which @sample will be checked. | |
1198 | * | |
1199 | * Checks @sample against @expires to see if any field of @sample has expired. | |
1200 | * Returns true if any field of the former is greater than the corresponding | |
1201 | * field of the latter if the latter field is set. Otherwise returns false. | |
1202 | */ | |
1203 | static inline int task_cputime_expired(const struct task_cputime *sample, | |
1204 | const struct task_cputime *expires) | |
1205 | { | |
64861634 | 1206 | if (expires->utime && sample->utime >= expires->utime) |
f06febc9 | 1207 | return 1; |
64861634 | 1208 | if (expires->stime && sample->utime + sample->stime >= expires->stime) |
f06febc9 FM |
1209 | return 1; |
1210 | if (expires->sum_exec_runtime != 0 && | |
1211 | sample->sum_exec_runtime >= expires->sum_exec_runtime) | |
1212 | return 1; | |
1213 | return 0; | |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * fastpath_timer_check - POSIX CPU timers fast path. | |
1218 | * | |
1219 | * @tsk: The task (thread) being checked. | |
f06febc9 | 1220 | * |
bb34d92f FM |
1221 | * Check the task and thread group timers. If both are zero (there are no |
1222 | * timers set) return false. Otherwise snapshot the task and thread group | |
1223 | * timers and compare them with the corresponding expiration times. Return | |
1224 | * true if a timer has expired, else return false. | |
f06febc9 | 1225 | */ |
bb34d92f | 1226 | static inline int fastpath_timer_check(struct task_struct *tsk) |
f06febc9 | 1227 | { |
ad133ba3 | 1228 | struct signal_struct *sig; |
bb34d92f | 1229 | |
bb34d92f FM |
1230 | if (!task_cputime_zero(&tsk->cputime_expires)) { |
1231 | struct task_cputime task_sample = { | |
1232 | .utime = tsk->utime, | |
1233 | .stime = tsk->stime, | |
1234 | .sum_exec_runtime = tsk->se.sum_exec_runtime | |
1235 | }; | |
1236 | ||
1237 | if (task_cputime_expired(&task_sample, &tsk->cputime_expires)) | |
1238 | return 1; | |
1239 | } | |
ad133ba3 ON |
1240 | |
1241 | sig = tsk->signal; | |
29f87b79 | 1242 | if (sig->cputimer.running) { |
bb34d92f FM |
1243 | struct task_cputime group_sample; |
1244 | ||
ee30a7b2 | 1245 | raw_spin_lock(&sig->cputimer.lock); |
8d1f431c | 1246 | group_sample = sig->cputimer.cputime; |
ee30a7b2 | 1247 | raw_spin_unlock(&sig->cputimer.lock); |
8d1f431c | 1248 | |
bb34d92f FM |
1249 | if (task_cputime_expired(&group_sample, &sig->cputime_expires)) |
1250 | return 1; | |
1251 | } | |
37bebc70 | 1252 | |
f55db609 | 1253 | return 0; |
f06febc9 FM |
1254 | } |
1255 | ||
1da177e4 LT |
1256 | /* |
1257 | * This is called from the timer interrupt handler. The irq handler has | |
1258 | * already updated our counts. We need to check if any timers fire now. | |
1259 | * Interrupts are disabled. | |
1260 | */ | |
1261 | void run_posix_cpu_timers(struct task_struct *tsk) | |
1262 | { | |
1263 | LIST_HEAD(firing); | |
1264 | struct k_itimer *timer, *next; | |
0bdd2ed4 | 1265 | unsigned long flags; |
1da177e4 LT |
1266 | |
1267 | BUG_ON(!irqs_disabled()); | |
1268 | ||
1da177e4 | 1269 | /* |
f06febc9 | 1270 | * The fast path checks that there are no expired thread or thread |
bb34d92f | 1271 | * group timers. If that's so, just return. |
1da177e4 | 1272 | */ |
bb34d92f | 1273 | if (!fastpath_timer_check(tsk)) |
f06febc9 | 1274 | return; |
5ce73a4a | 1275 | |
0bdd2ed4 ON |
1276 | if (!lock_task_sighand(tsk, &flags)) |
1277 | return; | |
bb34d92f FM |
1278 | /* |
1279 | * Here we take off tsk->signal->cpu_timers[N] and | |
1280 | * tsk->cpu_timers[N] all the timers that are firing, and | |
1281 | * put them on the firing list. | |
1282 | */ | |
1283 | check_thread_timers(tsk, &firing); | |
29f87b79 SG |
1284 | /* |
1285 | * If there are any active process wide timers (POSIX 1.b, itimers, | |
1286 | * RLIMIT_CPU) cputimer must be running. | |
1287 | */ | |
1288 | if (tsk->signal->cputimer.running) | |
1289 | check_process_timers(tsk, &firing); | |
1da177e4 | 1290 | |
bb34d92f FM |
1291 | /* |
1292 | * We must release these locks before taking any timer's lock. | |
1293 | * There is a potential race with timer deletion here, as the | |
1294 | * siglock now protects our private firing list. We have set | |
1295 | * the firing flag in each timer, so that a deletion attempt | |
1296 | * that gets the timer lock before we do will give it up and | |
1297 | * spin until we've taken care of that timer below. | |
1298 | */ | |
0bdd2ed4 | 1299 | unlock_task_sighand(tsk, &flags); |
1da177e4 LT |
1300 | |
1301 | /* | |
1302 | * Now that all the timers on our list have the firing flag, | |
25985edc | 1303 | * no one will touch their list entries but us. We'll take |
1da177e4 LT |
1304 | * each timer's lock before clearing its firing flag, so no |
1305 | * timer call will interfere. | |
1306 | */ | |
1307 | list_for_each_entry_safe(timer, next, &firing, it.cpu.entry) { | |
6e85c5ba HS |
1308 | int cpu_firing; |
1309 | ||
1da177e4 LT |
1310 | spin_lock(&timer->it_lock); |
1311 | list_del_init(&timer->it.cpu.entry); | |
6e85c5ba | 1312 | cpu_firing = timer->it.cpu.firing; |
1da177e4 LT |
1313 | timer->it.cpu.firing = 0; |
1314 | /* | |
1315 | * The firing flag is -1 if we collided with a reset | |
1316 | * of the timer, which already reported this | |
1317 | * almost-firing as an overrun. So don't generate an event. | |
1318 | */ | |
6e85c5ba | 1319 | if (likely(cpu_firing >= 0)) |
1da177e4 | 1320 | cpu_timer_fire(timer); |
1da177e4 LT |
1321 | spin_unlock(&timer->it_lock); |
1322 | } | |
1323 | } | |
1324 | ||
1325 | /* | |
f55db609 | 1326 | * Set one of the process-wide special case CPU timers or RLIMIT_CPU. |
f06febc9 | 1327 | * The tsk->sighand->siglock must be held by the caller. |
1da177e4 LT |
1328 | */ |
1329 | void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx, | |
1330 | cputime_t *newval, cputime_t *oldval) | |
1331 | { | |
1332 | union cpu_time_count now; | |
1da177e4 LT |
1333 | |
1334 | BUG_ON(clock_idx == CPUCLOCK_SCHED); | |
4cd4c1b4 | 1335 | cpu_timer_sample_group(clock_idx, tsk, &now); |
1da177e4 LT |
1336 | |
1337 | if (oldval) { | |
f55db609 SG |
1338 | /* |
1339 | * We are setting itimer. The *oldval is absolute and we update | |
1340 | * it to be relative, *newval argument is relative and we update | |
1341 | * it to be absolute. | |
1342 | */ | |
64861634 MS |
1343 | if (*oldval) { |
1344 | if (*oldval <= now.cpu) { | |
1da177e4 | 1345 | /* Just about to fire. */ |
a42548a1 | 1346 | *oldval = cputime_one_jiffy; |
1da177e4 | 1347 | } else { |
64861634 | 1348 | *oldval -= now.cpu; |
1da177e4 LT |
1349 | } |
1350 | } | |
1351 | ||
64861634 | 1352 | if (!*newval) |
1da177e4 | 1353 | return; |
64861634 | 1354 | *newval += now.cpu; |
1da177e4 LT |
1355 | } |
1356 | ||
1357 | /* | |
f55db609 SG |
1358 | * Update expiration cache if we are the earliest timer, or eventually |
1359 | * RLIMIT_CPU limit is earlier than prof_exp cpu timer expire. | |
1da177e4 | 1360 | */ |
f55db609 SG |
1361 | switch (clock_idx) { |
1362 | case CPUCLOCK_PROF: | |
1363 | if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval)) | |
f06febc9 | 1364 | tsk->signal->cputime_expires.prof_exp = *newval; |
f55db609 SG |
1365 | break; |
1366 | case CPUCLOCK_VIRT: | |
1367 | if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval)) | |
f06febc9 | 1368 | tsk->signal->cputime_expires.virt_exp = *newval; |
f55db609 | 1369 | break; |
1da177e4 LT |
1370 | } |
1371 | } | |
1372 | ||
e4b76555 TA |
1373 | static int do_cpu_nanosleep(const clockid_t which_clock, int flags, |
1374 | struct timespec *rqtp, struct itimerspec *it) | |
1da177e4 | 1375 | { |
1da177e4 LT |
1376 | struct k_itimer timer; |
1377 | int error; | |
1378 | ||
1da177e4 LT |
1379 | /* |
1380 | * Set up a temporary timer and then wait for it to go off. | |
1381 | */ | |
1382 | memset(&timer, 0, sizeof timer); | |
1383 | spin_lock_init(&timer.it_lock); | |
1384 | timer.it_clock = which_clock; | |
1385 | timer.it_overrun = -1; | |
1386 | error = posix_cpu_timer_create(&timer); | |
1387 | timer.it_process = current; | |
1388 | if (!error) { | |
1da177e4 | 1389 | static struct itimerspec zero_it; |
e4b76555 TA |
1390 | |
1391 | memset(it, 0, sizeof *it); | |
1392 | it->it_value = *rqtp; | |
1da177e4 LT |
1393 | |
1394 | spin_lock_irq(&timer.it_lock); | |
e4b76555 | 1395 | error = posix_cpu_timer_set(&timer, flags, it, NULL); |
1da177e4 LT |
1396 | if (error) { |
1397 | spin_unlock_irq(&timer.it_lock); | |
1398 | return error; | |
1399 | } | |
1400 | ||
1401 | while (!signal_pending(current)) { | |
1402 | if (timer.it.cpu.expires.sched == 0) { | |
1403 | /* | |
1404 | * Our timer fired and was reset. | |
1405 | */ | |
1406 | spin_unlock_irq(&timer.it_lock); | |
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | /* | |
1411 | * Block until cpu_timer_fire (or a signal) wakes us. | |
1412 | */ | |
1413 | __set_current_state(TASK_INTERRUPTIBLE); | |
1414 | spin_unlock_irq(&timer.it_lock); | |
1415 | schedule(); | |
1416 | spin_lock_irq(&timer.it_lock); | |
1417 | } | |
1418 | ||
1419 | /* | |
1420 | * We were interrupted by a signal. | |
1421 | */ | |
1422 | sample_to_timespec(which_clock, timer.it.cpu.expires, rqtp); | |
e4b76555 | 1423 | posix_cpu_timer_set(&timer, 0, &zero_it, it); |
1da177e4 LT |
1424 | spin_unlock_irq(&timer.it_lock); |
1425 | ||
e4b76555 | 1426 | if ((it->it_value.tv_sec | it->it_value.tv_nsec) == 0) { |
1da177e4 LT |
1427 | /* |
1428 | * It actually did fire already. | |
1429 | */ | |
1430 | return 0; | |
1431 | } | |
1432 | ||
e4b76555 TA |
1433 | error = -ERESTART_RESTARTBLOCK; |
1434 | } | |
1435 | ||
1436 | return error; | |
1437 | } | |
1438 | ||
bc2c8ea4 TG |
1439 | static long posix_cpu_nsleep_restart(struct restart_block *restart_block); |
1440 | ||
1441 | static int posix_cpu_nsleep(const clockid_t which_clock, int flags, | |
1442 | struct timespec *rqtp, struct timespec __user *rmtp) | |
e4b76555 TA |
1443 | { |
1444 | struct restart_block *restart_block = | |
3751f9f2 | 1445 | ¤t_thread_info()->restart_block; |
e4b76555 TA |
1446 | struct itimerspec it; |
1447 | int error; | |
1448 | ||
1449 | /* | |
1450 | * Diagnose required errors first. | |
1451 | */ | |
1452 | if (CPUCLOCK_PERTHREAD(which_clock) && | |
1453 | (CPUCLOCK_PID(which_clock) == 0 || | |
1454 | CPUCLOCK_PID(which_clock) == current->pid)) | |
1455 | return -EINVAL; | |
1456 | ||
1457 | error = do_cpu_nanosleep(which_clock, flags, rqtp, &it); | |
1458 | ||
1459 | if (error == -ERESTART_RESTARTBLOCK) { | |
1460 | ||
3751f9f2 | 1461 | if (flags & TIMER_ABSTIME) |
e4b76555 | 1462 | return -ERESTARTNOHAND; |
1da177e4 | 1463 | /* |
3751f9f2 TG |
1464 | * Report back to the user the time still remaining. |
1465 | */ | |
1466 | if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) | |
1da177e4 LT |
1467 | return -EFAULT; |
1468 | ||
1711ef38 | 1469 | restart_block->fn = posix_cpu_nsleep_restart; |
ab8177bc | 1470 | restart_block->nanosleep.clockid = which_clock; |
3751f9f2 TG |
1471 | restart_block->nanosleep.rmtp = rmtp; |
1472 | restart_block->nanosleep.expires = timespec_to_ns(rqtp); | |
1da177e4 | 1473 | } |
1da177e4 LT |
1474 | return error; |
1475 | } | |
1476 | ||
bc2c8ea4 | 1477 | static long posix_cpu_nsleep_restart(struct restart_block *restart_block) |
1da177e4 | 1478 | { |
ab8177bc | 1479 | clockid_t which_clock = restart_block->nanosleep.clockid; |
97735f25 | 1480 | struct timespec t; |
e4b76555 TA |
1481 | struct itimerspec it; |
1482 | int error; | |
97735f25 | 1483 | |
3751f9f2 | 1484 | t = ns_to_timespec(restart_block->nanosleep.expires); |
97735f25 | 1485 | |
e4b76555 TA |
1486 | error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it); |
1487 | ||
1488 | if (error == -ERESTART_RESTARTBLOCK) { | |
3751f9f2 | 1489 | struct timespec __user *rmtp = restart_block->nanosleep.rmtp; |
e4b76555 | 1490 | /* |
3751f9f2 TG |
1491 | * Report back to the user the time still remaining. |
1492 | */ | |
1493 | if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) | |
e4b76555 TA |
1494 | return -EFAULT; |
1495 | ||
3751f9f2 | 1496 | restart_block->nanosleep.expires = timespec_to_ns(&t); |
e4b76555 TA |
1497 | } |
1498 | return error; | |
1499 | ||
1da177e4 LT |
1500 | } |
1501 | ||
1da177e4 LT |
1502 | #define PROCESS_CLOCK MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED) |
1503 | #define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED) | |
1504 | ||
a924b04d TG |
1505 | static int process_cpu_clock_getres(const clockid_t which_clock, |
1506 | struct timespec *tp) | |
1da177e4 LT |
1507 | { |
1508 | return posix_cpu_clock_getres(PROCESS_CLOCK, tp); | |
1509 | } | |
a924b04d TG |
1510 | static int process_cpu_clock_get(const clockid_t which_clock, |
1511 | struct timespec *tp) | |
1da177e4 LT |
1512 | { |
1513 | return posix_cpu_clock_get(PROCESS_CLOCK, tp); | |
1514 | } | |
1515 | static int process_cpu_timer_create(struct k_itimer *timer) | |
1516 | { | |
1517 | timer->it_clock = PROCESS_CLOCK; | |
1518 | return posix_cpu_timer_create(timer); | |
1519 | } | |
a924b04d | 1520 | static int process_cpu_nsleep(const clockid_t which_clock, int flags, |
97735f25 TG |
1521 | struct timespec *rqtp, |
1522 | struct timespec __user *rmtp) | |
1da177e4 | 1523 | { |
97735f25 | 1524 | return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp); |
1da177e4 | 1525 | } |
1711ef38 TA |
1526 | static long process_cpu_nsleep_restart(struct restart_block *restart_block) |
1527 | { | |
1528 | return -EINVAL; | |
1529 | } | |
a924b04d TG |
1530 | static int thread_cpu_clock_getres(const clockid_t which_clock, |
1531 | struct timespec *tp) | |
1da177e4 LT |
1532 | { |
1533 | return posix_cpu_clock_getres(THREAD_CLOCK, tp); | |
1534 | } | |
a924b04d TG |
1535 | static int thread_cpu_clock_get(const clockid_t which_clock, |
1536 | struct timespec *tp) | |
1da177e4 LT |
1537 | { |
1538 | return posix_cpu_clock_get(THREAD_CLOCK, tp); | |
1539 | } | |
1540 | static int thread_cpu_timer_create(struct k_itimer *timer) | |
1541 | { | |
1542 | timer->it_clock = THREAD_CLOCK; | |
1543 | return posix_cpu_timer_create(timer); | |
1544 | } | |
1da177e4 | 1545 | |
1976945e TG |
1546 | struct k_clock clock_posix_cpu = { |
1547 | .clock_getres = posix_cpu_clock_getres, | |
1548 | .clock_set = posix_cpu_clock_set, | |
1549 | .clock_get = posix_cpu_clock_get, | |
1550 | .timer_create = posix_cpu_timer_create, | |
1551 | .nsleep = posix_cpu_nsleep, | |
1552 | .nsleep_restart = posix_cpu_nsleep_restart, | |
1553 | .timer_set = posix_cpu_timer_set, | |
1554 | .timer_del = posix_cpu_timer_del, | |
1555 | .timer_get = posix_cpu_timer_get, | |
1556 | }; | |
1557 | ||
1da177e4 LT |
1558 | static __init int init_posix_cpu_timers(void) |
1559 | { | |
1560 | struct k_clock process = { | |
2fd1f040 TG |
1561 | .clock_getres = process_cpu_clock_getres, |
1562 | .clock_get = process_cpu_clock_get, | |
2fd1f040 TG |
1563 | .timer_create = process_cpu_timer_create, |
1564 | .nsleep = process_cpu_nsleep, | |
1565 | .nsleep_restart = process_cpu_nsleep_restart, | |
1da177e4 LT |
1566 | }; |
1567 | struct k_clock thread = { | |
2fd1f040 TG |
1568 | .clock_getres = thread_cpu_clock_getres, |
1569 | .clock_get = thread_cpu_clock_get, | |
2fd1f040 | 1570 | .timer_create = thread_cpu_timer_create, |
1da177e4 | 1571 | }; |
8356b5f9 | 1572 | struct timespec ts; |
1da177e4 | 1573 | |
52708737 TG |
1574 | posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process); |
1575 | posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread); | |
1da177e4 | 1576 | |
a42548a1 | 1577 | cputime_to_timespec(cputime_one_jiffy, &ts); |
8356b5f9 SG |
1578 | onecputick = ts.tv_nsec; |
1579 | WARN_ON(ts.tv_sec != 0); | |
1580 | ||
1da177e4 LT |
1581 | return 0; |
1582 | } | |
1583 | __initcall(init_posix_cpu_timers); |