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kernel/posix-cpu-timers.c
42.5 KB
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/* * Implement CPU time clocks for the POSIX clock interface. */ #include <linux/sched.h> #include <linux/posix-timers.h> |
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#include <linux/errno.h> |
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#include <linux/math64.h> #include <asm/uaccess.h> |
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#include <linux/kernel_stat.h> |
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#include <trace/events/timer.h> |
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/* |
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* Called after updating RLIMIT_CPU to run cpu timer and update * tsk->signal->cputime_expires expiration cache if necessary. Needs * siglock protection since other code may update expiration cache as * well. |
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*/ |
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void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new) |
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{ |
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cputime_t cputime = secs_to_cputime(rlim_new); |
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|
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spin_lock_irq(&task->sighand->siglock); set_process_cpu_timer(task, CPUCLOCK_PROF, &cputime, NULL); spin_unlock_irq(&task->sighand->siglock); |
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} |
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static int check_clock(const clockid_t which_clock) |
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{ int error = 0; struct task_struct *p; const pid_t pid = CPUCLOCK_PID(which_clock); if (CPUCLOCK_WHICH(which_clock) >= CPUCLOCK_MAX) return -EINVAL; if (pid == 0) return 0; |
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rcu_read_lock(); |
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p = find_task_by_vpid(pid); |
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if (!p || !(CPUCLOCK_PERTHREAD(which_clock) ? |
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same_thread_group(p, current) : has_group_leader_pid(p))) { |
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error = -EINVAL; } |
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rcu_read_unlock(); |
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return error; } static inline union cpu_time_count |
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timespec_to_sample(const clockid_t which_clock, const struct timespec *tp) |
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{ union cpu_time_count ret; ret.sched = 0; /* high half always zero when .cpu used */ if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { |
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ret.sched = (unsigned long long)tp->tv_sec * NSEC_PER_SEC + tp->tv_nsec; |
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} else { ret.cpu = timespec_to_cputime(tp); } return ret; } |
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static void sample_to_timespec(const clockid_t which_clock, |
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union cpu_time_count cpu, struct timespec *tp) { |
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if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) *tp = ns_to_timespec(cpu.sched); else |
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cputime_to_timespec(cpu.cpu, tp); |
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} |
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static inline int cpu_time_before(const clockid_t which_clock, |
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union cpu_time_count now, union cpu_time_count then) { if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { return now.sched < then.sched; } else { return cputime_lt(now.cpu, then.cpu); } } |
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static inline void cpu_time_add(const clockid_t which_clock, |
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union cpu_time_count *acc, union cpu_time_count val) { if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { acc->sched += val.sched; } else { acc->cpu = cputime_add(acc->cpu, val.cpu); } } |
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static inline union cpu_time_count cpu_time_sub(const clockid_t which_clock, |
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union cpu_time_count a, union cpu_time_count b) { if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { a.sched -= b.sched; } else { a.cpu = cputime_sub(a.cpu, b.cpu); } return a; } /* |
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* Divide and limit the result to res >= 1 * * This is necessary to prevent signal delivery starvation, when the result of * the division would be rounded down to 0. */ static inline cputime_t cputime_div_non_zero(cputime_t time, unsigned long div) { cputime_t res = cputime_div(time, div); return max_t(cputime_t, res, 1); } /* |
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* Update expiry time from increment, and increase overrun count, * given the current clock sample. */ |
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static void bump_cpu_timer(struct k_itimer *timer, |
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union cpu_time_count now) { int i; if (timer->it.cpu.incr.sched == 0) return; if (CPUCLOCK_WHICH(timer->it_clock) == CPUCLOCK_SCHED) { unsigned long long delta, incr; if (now.sched < timer->it.cpu.expires.sched) return; incr = timer->it.cpu.incr.sched; delta = now.sched + incr - timer->it.cpu.expires.sched; /* Don't use (incr*2 < delta), incr*2 might overflow. */ for (i = 0; incr < delta - incr; i++) incr = incr << 1; for (; i >= 0; incr >>= 1, i--) { |
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if (delta < incr) |
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continue; timer->it.cpu.expires.sched += incr; timer->it_overrun += 1 << i; delta -= incr; } } else { cputime_t delta, incr; if (cputime_lt(now.cpu, timer->it.cpu.expires.cpu)) return; incr = timer->it.cpu.incr.cpu; delta = cputime_sub(cputime_add(now.cpu, incr), timer->it.cpu.expires.cpu); /* Don't use (incr*2 < delta), incr*2 might overflow. */ for (i = 0; cputime_lt(incr, cputime_sub(delta, incr)); i++) incr = cputime_add(incr, incr); for (; i >= 0; incr = cputime_halve(incr), i--) { |
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if (cputime_lt(delta, incr)) |
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continue; timer->it.cpu.expires.cpu = cputime_add(timer->it.cpu.expires.cpu, incr); timer->it_overrun += 1 << i; delta = cputime_sub(delta, incr); } } } static inline cputime_t prof_ticks(struct task_struct *p) { return cputime_add(p->utime, p->stime); } static inline cputime_t virt_ticks(struct task_struct *p) { return p->utime; } |
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|
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static int posix_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) |
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{ int error = check_clock(which_clock); if (!error) { tp->tv_sec = 0; tp->tv_nsec = ((NSEC_PER_SEC + HZ - 1) / HZ); if (CPUCLOCK_WHICH(which_clock) == CPUCLOCK_SCHED) { /* * If sched_clock is using a cycle counter, we * don't have any idea of its true resolution * exported, but it is much more than 1s/HZ. */ tp->tv_nsec = 1; } } return error; } |
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static int posix_cpu_clock_set(const clockid_t which_clock, const struct timespec *tp) |
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{ /* * You can never reset a CPU clock, but we check for other errors * in the call before failing with EPERM. */ int error = check_clock(which_clock); if (error == 0) { error = -EPERM; } return error; } /* * Sample a per-thread clock for the given task. */ |
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static int cpu_clock_sample(const clockid_t which_clock, struct task_struct *p, |
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union cpu_time_count *cpu) { switch (CPUCLOCK_WHICH(which_clock)) { default: return -EINVAL; case CPUCLOCK_PROF: cpu->cpu = prof_ticks(p); break; case CPUCLOCK_VIRT: cpu->cpu = virt_ticks(p); break; case CPUCLOCK_SCHED: |
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cpu->sched = task_sched_runtime(p); |
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break; } return 0; } |
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void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times) { |
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struct signal_struct *sig = tsk->signal; |
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struct task_struct *t; |
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times->utime = sig->utime; times->stime = sig->stime; times->sum_exec_runtime = sig->sum_sched_runtime; |
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rcu_read_lock(); |
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/* make sure we can trust tsk->thread_group list */ if (!likely(pid_alive(tsk))) |
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goto out; |
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t = tsk; do { times->utime = cputime_add(times->utime, t->utime); times->stime = cputime_add(times->stime, t->stime); |
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times->sum_exec_runtime += task_sched_runtime(t); |
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} while_each_thread(tsk, t); |
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out: rcu_read_unlock(); } |
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static void update_gt_cputime(struct task_cputime *a, struct task_cputime *b) { if (cputime_gt(b->utime, a->utime)) a->utime = b->utime; if (cputime_gt(b->stime, a->stime)) a->stime = b->stime; if (b->sum_exec_runtime > a->sum_exec_runtime) a->sum_exec_runtime = b->sum_exec_runtime; } void thread_group_cputimer(struct task_struct *tsk, struct task_cputime *times) { struct thread_group_cputimer *cputimer = &tsk->signal->cputimer; struct task_cputime sum; unsigned long flags; |
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if (!cputimer->running) { |
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/* * The POSIX timer interface allows for absolute time expiry * values through the TIMER_ABSTIME flag, therefore we have * to synchronize the timer to the clock every time we start * it. */ thread_group_cputime(tsk, &sum); |
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spin_lock_irqsave(&cputimer->lock, flags); cputimer->running = 1; |
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update_gt_cputime(&cputimer->cputime, &sum); |
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} else spin_lock_irqsave(&cputimer->lock, flags); |
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*times = cputimer->cputime; spin_unlock_irqrestore(&cputimer->lock, flags); } |
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/* * Sample a process (thread group) clock for the given group_leader task. * Must be called with tasklist_lock held for reading. |
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*/ |
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static int cpu_clock_sample_group(const clockid_t which_clock, struct task_struct *p, union cpu_time_count *cpu) |
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{ |
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struct task_cputime cputime; |
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switch (CPUCLOCK_WHICH(which_clock)) { |
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default: return -EINVAL; case CPUCLOCK_PROF: |
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thread_group_cputime(p, &cputime); |
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cpu->cpu = cputime_add(cputime.utime, cputime.stime); |
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break; case CPUCLOCK_VIRT: |
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thread_group_cputime(p, &cputime); |
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cpu->cpu = cputime.utime; |
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break; case CPUCLOCK_SCHED: |
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thread_group_cputime(p, &cputime); cpu->sched = cputime.sum_exec_runtime; |
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break; } return 0; } |
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|
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static int posix_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
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{ const pid_t pid = CPUCLOCK_PID(which_clock); int error = -EINVAL; union cpu_time_count rtn; if (pid == 0) { /* * Special case constant value for our own clocks. * We don't have to do any lookup to find ourselves. */ if (CPUCLOCK_PERTHREAD(which_clock)) { /* * Sampling just ourselves we can do with no locking. */ error = cpu_clock_sample(which_clock, current, &rtn); } else { read_lock(&tasklist_lock); error = cpu_clock_sample_group(which_clock, current, &rtn); read_unlock(&tasklist_lock); } } else { /* * Find the given PID, and validate that the caller * should be able to see it. */ struct task_struct *p; |
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rcu_read_lock(); |
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p = find_task_by_vpid(pid); |
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if (p) { if (CPUCLOCK_PERTHREAD(which_clock)) { |
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if (same_thread_group(p, current)) { |
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error = cpu_clock_sample(which_clock, p, &rtn); } |
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} else { read_lock(&tasklist_lock); |
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if (thread_group_leader(p) && p->sighand) { |
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error = cpu_clock_sample_group(which_clock, p, &rtn); } read_unlock(&tasklist_lock); |
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} } |
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rcu_read_unlock(); |
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} if (error) return error; sample_to_timespec(which_clock, rtn, tp); return 0; } /* * Validate the clockid_t for a new CPU-clock timer, and initialize the timer. |
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* This is called from sys_timer_create() and do_cpu_nanosleep() with the * new timer already all-zeros initialized. |
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*/ |
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static int posix_cpu_timer_create(struct k_itimer *new_timer) |
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{ int ret = 0; const pid_t pid = CPUCLOCK_PID(new_timer->it_clock); struct task_struct *p; if (CPUCLOCK_WHICH(new_timer->it_clock) >= CPUCLOCK_MAX) return -EINVAL; INIT_LIST_HEAD(&new_timer->it.cpu.entry); |
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rcu_read_lock(); |
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if (CPUCLOCK_PERTHREAD(new_timer->it_clock)) { if (pid == 0) { p = current; } else { |
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p = find_task_by_vpid(pid); |
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if (p && !same_thread_group(p, current)) |
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p = NULL; } } else { if (pid == 0) { p = current->group_leader; } else { |
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p = find_task_by_vpid(pid); |
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if (p && !has_group_leader_pid(p)) |
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p = NULL; } } new_timer->it.cpu.task = p; if (p) { get_task_struct(p); } else { ret = -EINVAL; } |
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rcu_read_unlock(); |
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return ret; } /* * Clean up a CPU-clock timer that is about to be destroyed. * This is called from timer deletion with the timer already locked. * If we return TIMER_RETRY, it's necessary to release the timer's lock * and try again. (This happens when the timer is in the middle of firing.) */ |
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static int posix_cpu_timer_del(struct k_itimer *timer) |
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{ struct task_struct *p = timer->it.cpu.task; |
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int ret = 0; |
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|
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if (likely(p != NULL)) { |
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read_lock(&tasklist_lock); |
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if (unlikely(p->sighand == NULL)) { |
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/* * We raced with the reaping of the task. * The deletion should have cleared us off the list. */ BUG_ON(!list_empty(&timer->it.cpu.entry)); } else { |
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spin_lock(&p->sighand->siglock); |
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if (timer->it.cpu.firing) ret = TIMER_RETRY; else list_del(&timer->it.cpu.entry); |
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spin_unlock(&p->sighand->siglock); } read_unlock(&tasklist_lock); |
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if (!ret) put_task_struct(p); |
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} |
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|
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return ret; |
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} /* * Clean out CPU timers still ticking when a thread exited. The task * pointer is cleared, and the expiry time is replaced with the residual * time for later timer_gettime calls to return. * This must be called with the siglock held. */ static void cleanup_timers(struct list_head *head, cputime_t utime, cputime_t stime, |
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unsigned long long sum_exec_runtime) |
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{ struct cpu_timer_list *timer, *next; cputime_t ptime = cputime_add(utime, stime); list_for_each_entry_safe(timer, next, head, entry) { |
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list_del_init(&timer->entry); if (cputime_lt(timer->expires.cpu, ptime)) { timer->expires.cpu = cputime_zero; } else { timer->expires.cpu = cputime_sub(timer->expires.cpu, ptime); } } ++head; list_for_each_entry_safe(timer, next, head, entry) { |
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list_del_init(&timer->entry); if (cputime_lt(timer->expires.cpu, utime)) { timer->expires.cpu = cputime_zero; } else { timer->expires.cpu = cputime_sub(timer->expires.cpu, utime); } } ++head; list_for_each_entry_safe(timer, next, head, entry) { |
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list_del_init(&timer->entry); |
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if (timer->expires.sched < sum_exec_runtime) { |
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timer->expires.sched = 0; } else { |
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timer->expires.sched -= sum_exec_runtime; |
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} } } /* * These are both called with the siglock held, when the current thread * is being reaped. When the final (leader) thread in the group is reaped, * posix_cpu_timers_exit_group will be called after posix_cpu_timers_exit. */ void posix_cpu_timers_exit(struct task_struct *tsk) { cleanup_timers(tsk->cpu_timers, |
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tsk->utime, tsk->stime, tsk->se.sum_exec_runtime); |
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} void posix_cpu_timers_exit_group(struct task_struct *tsk) { |
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struct signal_struct *const sig = tsk->signal; |
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|
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cleanup_timers(tsk->signal->cpu_timers, |
17d42c1c4 posix_cpu_timers_... |
510 511 512 |
cputime_add(tsk->utime, sig->utime), cputime_add(tsk->stime, sig->stime), tsk->se.sum_exec_runtime + sig->sum_sched_runtime); |
1da177e4c Linux-2.6.12-rc2 |
513 514 515 516 517 518 519 520 521 522 523 524 525 526 |
} static void clear_dead_task(struct k_itimer *timer, union cpu_time_count now) { /* * That's all for this thread or process. * We leave our residual in expires to be reported. */ put_task_struct(timer->it.cpu.task); timer->it.cpu.task = NULL; timer->it.cpu.expires = cpu_time_sub(timer->it_clock, timer->it.cpu.expires, now); } |
d1e3b6d19 itimers: Simplify... |
527 528 529 530 531 |
static inline int expires_gt(cputime_t expires, cputime_t new_exp) { return cputime_eq(expires, cputime_zero) || cputime_gt(expires, new_exp); } |
1da177e4c Linux-2.6.12-rc2 |
532 533 534 |
/* * Insert the timer on the appropriate list before any timers that * expire later. This must be called with the tasklist_lock held |
c28739375 cpu-timers: Avoid... |
535 |
* for reading, interrupts disabled and p->sighand->siglock taken. |
1da177e4c Linux-2.6.12-rc2 |
536 |
*/ |
5eb9aa641 cpu-timers: Clean... |
537 |
static void arm_timer(struct k_itimer *timer) |
1da177e4c Linux-2.6.12-rc2 |
538 539 540 |
{ struct task_struct *p = timer->it.cpu.task; struct list_head *head, *listpos; |
5eb9aa641 cpu-timers: Clean... |
541 |
struct task_cputime *cputime_expires; |
1da177e4c Linux-2.6.12-rc2 |
542 543 |
struct cpu_timer_list *const nt = &timer->it.cpu; struct cpu_timer_list *next; |
1da177e4c Linux-2.6.12-rc2 |
544 |
|
5eb9aa641 cpu-timers: Clean... |
545 546 547 548 549 550 551 |
if (CPUCLOCK_PERTHREAD(timer->it_clock)) { head = p->cpu_timers; cputime_expires = &p->cputime_expires; } else { head = p->signal->cpu_timers; cputime_expires = &p->signal->cputime_expires; } |
1da177e4c Linux-2.6.12-rc2 |
552 |
head += CPUCLOCK_WHICH(timer->it_clock); |
1da177e4c Linux-2.6.12-rc2 |
553 |
listpos = head; |
5eb9aa641 cpu-timers: Clean... |
554 555 556 557 |
list_for_each_entry(next, head, entry) { if (cpu_time_before(timer->it_clock, nt->expires, next->expires)) break; listpos = &next->entry; |
1da177e4c Linux-2.6.12-rc2 |
558 559 560 561 |
} list_add(&nt->entry, listpos); if (listpos == head) { |
5eb9aa641 cpu-timers: Clean... |
562 |
union cpu_time_count *exp = &nt->expires; |
1da177e4c Linux-2.6.12-rc2 |
563 |
/* |
5eb9aa641 cpu-timers: Clean... |
564 565 566 567 |
* We are the new earliest-expiring POSIX 1.b timer, hence * need to update expiration cache. Take into account that * for process timers we share expiration cache with itimers * and RLIMIT_CPU and for thread timers with RLIMIT_RTTIME. |
1da177e4c Linux-2.6.12-rc2 |
568 |
*/ |
5eb9aa641 cpu-timers: Clean... |
569 570 571 572 573 574 575 576 577 578 579 580 581 582 |
switch (CPUCLOCK_WHICH(timer->it_clock)) { case CPUCLOCK_PROF: if (expires_gt(cputime_expires->prof_exp, exp->cpu)) cputime_expires->prof_exp = exp->cpu; break; case CPUCLOCK_VIRT: if (expires_gt(cputime_expires->virt_exp, exp->cpu)) cputime_expires->virt_exp = exp->cpu; break; case CPUCLOCK_SCHED: if (cputime_expires->sched_exp == 0 || cputime_expires->sched_exp > exp->sched) cputime_expires->sched_exp = exp->sched; break; |
1da177e4c Linux-2.6.12-rc2 |
583 584 |
} } |
1da177e4c Linux-2.6.12-rc2 |
585 586 587 588 589 590 591 |
} /* * The timer is locked, fire it and arrange for its reload. */ static void cpu_timer_fire(struct k_itimer *timer) { |
1f169f84d cpu-timers: Chang... |
592 593 594 595 596 597 |
if ((timer->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) { /* * User don't want any signal. */ timer->it.cpu.expires.sched = 0; } else if (unlikely(timer->sigq == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 |
/* * This a special case for clock_nanosleep, * not a normal timer from sys_timer_create. */ wake_up_process(timer->it_process); timer->it.cpu.expires.sched = 0; } else if (timer->it.cpu.incr.sched == 0) { /* * One-shot timer. Clear it as soon as it's fired. */ posix_timer_event(timer, 0); timer->it.cpu.expires.sched = 0; } else if (posix_timer_event(timer, ++timer->it_requeue_pending)) { /* * The signal did not get queued because the signal * was ignored, so we won't get any callback to * reload the timer. But we need to keep it * ticking in case the signal is deliverable next time. */ posix_cpu_timer_schedule(timer); } } /* |
3997ad317 timers: more cons... |
622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 |
* Sample a process (thread group) timer for the given group_leader task. * Must be called with tasklist_lock held for reading. */ static int cpu_timer_sample_group(const clockid_t which_clock, struct task_struct *p, union cpu_time_count *cpu) { struct task_cputime cputime; thread_group_cputimer(p, &cputime); switch (CPUCLOCK_WHICH(which_clock)) { default: return -EINVAL; case CPUCLOCK_PROF: cpu->cpu = cputime_add(cputime.utime, cputime.stime); break; case CPUCLOCK_VIRT: cpu->cpu = cputime.utime; break; case CPUCLOCK_SCHED: cpu->sched = cputime.sum_exec_runtime + task_delta_exec(p); break; } return 0; } /* |
1da177e4c Linux-2.6.12-rc2 |
649 650 651 652 653 |
* Guts of sys_timer_settime for CPU timers. * This is called with the timer locked and interrupts disabled. * If we return TIMER_RETRY, it's necessary to release the timer's lock * and try again. (This happens when the timer is in the middle of firing.) */ |
bc2c8ea48 posix-timers: Mak... |
654 655 |
static int posix_cpu_timer_set(struct k_itimer *timer, int flags, struct itimerspec *new, struct itimerspec *old) |
1da177e4c Linux-2.6.12-rc2 |
656 657 |
{ struct task_struct *p = timer->it.cpu.task; |
ae1a78eec cpu-timers: Retur... |
658 |
union cpu_time_count old_expires, new_expires, old_incr, val; |
1da177e4c Linux-2.6.12-rc2 |
659 660 661 662 663 664 665 666 667 668 669 670 671 672 |
int ret; if (unlikely(p == NULL)) { /* * Timer refers to a dead task's clock. */ return -ESRCH; } new_expires = timespec_to_sample(timer->it_clock, &new->it_value); read_lock(&tasklist_lock); /* * We need the tasklist_lock to protect against reaping that |
d30fda355 posix-cpu-timers:... |
673 |
* clears p->sighand. If p has just been reaped, we can no |
1da177e4c Linux-2.6.12-rc2 |
674 675 |
* longer get any information about it at all. */ |
d30fda355 posix-cpu-timers:... |
676 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
677 678 679 680 681 682 683 684 685 686 |
read_unlock(&tasklist_lock); put_task_struct(p); timer->it.cpu.task = NULL; return -ESRCH; } /* * Disarm any old timer after extracting its expiry time. */ BUG_ON(!irqs_disabled()); |
a69ac4a78 [PATCH] posix-tim... |
687 688 |
ret = 0; |
ae1a78eec cpu-timers: Retur... |
689 |
old_incr = timer->it.cpu.incr; |
1da177e4c Linux-2.6.12-rc2 |
690 691 |
spin_lock(&p->sighand->siglock); old_expires = timer->it.cpu.expires; |
a69ac4a78 [PATCH] posix-tim... |
692 693 694 695 696 |
if (unlikely(timer->it.cpu.firing)) { timer->it.cpu.firing = -1; ret = TIMER_RETRY; } else list_del_init(&timer->it.cpu.entry); |
1da177e4c Linux-2.6.12-rc2 |
697 698 699 700 701 702 703 704 705 706 707 708 |
/* * We need to sample the current value to convert the new * value from to relative and absolute, and to convert the * old value from absolute to relative. To set a process * timer, we need a sample to balance the thread expiry * times (in arm_timer). With an absolute time, we must * check if it's already passed. In short, we need a sample. */ if (CPUCLOCK_PERTHREAD(timer->it_clock)) { cpu_clock_sample(timer->it_clock, p, &val); } else { |
3997ad317 timers: more cons... |
709 |
cpu_timer_sample_group(timer->it_clock, p, &val); |
1da177e4c Linux-2.6.12-rc2 |
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 |
} if (old) { if (old_expires.sched == 0) { old->it_value.tv_sec = 0; old->it_value.tv_nsec = 0; } else { /* * Update the timer in case it has * overrun already. If it has, * we'll report it as having overrun * and with the next reloaded timer * already ticking, though we are * swallowing that pending * notification here to install the * new setting. */ bump_cpu_timer(timer, val); if (cpu_time_before(timer->it_clock, val, timer->it.cpu.expires)) { old_expires = cpu_time_sub( timer->it_clock, timer->it.cpu.expires, val); sample_to_timespec(timer->it_clock, old_expires, &old->it_value); } else { old->it_value.tv_nsec = 1; old->it_value.tv_sec = 0; } } } |
a69ac4a78 [PATCH] posix-tim... |
742 |
if (unlikely(ret)) { |
1da177e4c Linux-2.6.12-rc2 |
743 744 745 746 747 748 |
/* * We are colliding with the timer actually firing. * Punt after filling in the timer's old value, and * disable this firing since we are already reporting * it as an overrun (thanks to bump_cpu_timer above). */ |
c28739375 cpu-timers: Avoid... |
749 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
750 |
read_unlock(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 755 756 757 758 759 760 761 762 763 764 |
goto out; } if (new_expires.sched != 0 && !(flags & TIMER_ABSTIME)) { cpu_time_add(timer->it_clock, &new_expires, val); } /* * Install the new expiry time (or zero). * For a timer with no notification action, we don't actually * arm the timer (we'll just fake it for timer_gettime). */ timer->it.cpu.expires = new_expires; if (new_expires.sched != 0 && |
1da177e4c Linux-2.6.12-rc2 |
765 |
cpu_time_before(timer->it_clock, val, new_expires)) { |
5eb9aa641 cpu-timers: Clean... |
766 |
arm_timer(timer); |
1da177e4c Linux-2.6.12-rc2 |
767 |
} |
c28739375 cpu-timers: Avoid... |
768 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 |
read_unlock(&tasklist_lock); /* * Install the new reload setting, and * set up the signal and overrun bookkeeping. */ timer->it.cpu.incr = timespec_to_sample(timer->it_clock, &new->it_interval); /* * This acts as a modification timestamp for the timer, * so any automatic reload attempt will punt on seeing * that we have reset the timer manually. */ timer->it_requeue_pending = (timer->it_requeue_pending + 2) & ~REQUEUE_PENDING; timer->it_overrun_last = 0; timer->it_overrun = -1; if (new_expires.sched != 0 && |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 793 794 795 796 797 798 799 800 801 |
!cpu_time_before(timer->it_clock, val, new_expires)) { /* * The designated time already passed, so we notify * immediately, even if the thread never runs to * accumulate more time on this clock. */ cpu_timer_fire(timer); } ret = 0; out: if (old) { sample_to_timespec(timer->it_clock, |
ae1a78eec cpu-timers: Retur... |
802 |
old_incr, &old->it_interval); |
1da177e4c Linux-2.6.12-rc2 |
803 804 805 |
} return ret; } |
bc2c8ea48 posix-timers: Mak... |
806 |
static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) |
1da177e4c Linux-2.6.12-rc2 |
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 |
{ union cpu_time_count now; struct task_struct *p = timer->it.cpu.task; int clear_dead; /* * Easy part: convert the reload time. */ sample_to_timespec(timer->it_clock, timer->it.cpu.incr, &itp->it_interval); if (timer->it.cpu.expires.sched == 0) { /* Timer not armed at all. */ itp->it_value.tv_sec = itp->it_value.tv_nsec = 0; return; } if (unlikely(p == NULL)) { /* * This task already died and the timer will never fire. * In this case, expires is actually the dead value. */ dead: sample_to_timespec(timer->it_clock, timer->it.cpu.expires, &itp->it_value); return; } /* * Sample the clock to take the difference with the expiry time. */ if (CPUCLOCK_PERTHREAD(timer->it_clock)) { cpu_clock_sample(timer->it_clock, p, &now); clear_dead = p->exit_state; } else { read_lock(&tasklist_lock); |
d30fda355 posix-cpu-timers:... |
842 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
843 844 845 846 847 848 849 850 851 852 853 |
/* * The process has been reaped. * We can't even collect a sample any more. * Call the timer disarmed, nothing else to do. */ put_task_struct(p); timer->it.cpu.task = NULL; timer->it.cpu.expires.sched = 0; read_unlock(&tasklist_lock); goto dead; } else { |
3997ad317 timers: more cons... |
854 |
cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4c Linux-2.6.12-rc2 |
855 856 857 858 859 |
clear_dead = (unlikely(p->exit_state) && thread_group_empty(p)); } read_unlock(&tasklist_lock); } |
1da177e4c Linux-2.6.12-rc2 |
860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 |
if (unlikely(clear_dead)) { /* * We've noticed that the thread is dead, but * not yet reaped. Take this opportunity to * drop our task ref. */ clear_dead_task(timer, now); goto dead; } if (cpu_time_before(timer->it_clock, now, timer->it.cpu.expires)) { sample_to_timespec(timer->it_clock, cpu_time_sub(timer->it_clock, timer->it.cpu.expires, now), &itp->it_value); } else { /* * The timer should have expired already, but the firing * hasn't taken place yet. Say it's just about to expire. */ itp->it_value.tv_nsec = 1; itp->it_value.tv_sec = 0; } } /* * Check for any per-thread CPU timers that have fired and move them off * the tsk->cpu_timers[N] list onto the firing list. Here we update the * tsk->it_*_expires values to reflect the remaining thread CPU timers. */ static void check_thread_timers(struct task_struct *tsk, struct list_head *firing) { |
e80eda94d Posix timers: lim... |
893 |
int maxfire; |
1da177e4c Linux-2.6.12-rc2 |
894 |
struct list_head *timers = tsk->cpu_timers; |
78f2c7db6 sched: SCHED_FIFO... |
895 |
struct signal_struct *const sig = tsk->signal; |
d4bb52743 posix-cpu-timers:... |
896 |
unsigned long soft; |
1da177e4c Linux-2.6.12-rc2 |
897 |
|
e80eda94d Posix timers: lim... |
898 |
maxfire = 20; |
f06febc96 timers: fix itime... |
899 |
tsk->cputime_expires.prof_exp = cputime_zero; |
1da177e4c Linux-2.6.12-rc2 |
900 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
901 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
902 903 |
struct cpu_timer_list, entry); |
e80eda94d Posix timers: lim... |
904 |
if (!--maxfire || cputime_lt(prof_ticks(tsk), t->expires.cpu)) { |
f06febc96 timers: fix itime... |
905 |
tsk->cputime_expires.prof_exp = t->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
906 907 908 909 910 911 912 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } ++timers; |
e80eda94d Posix timers: lim... |
913 |
maxfire = 20; |
f06febc96 timers: fix itime... |
914 |
tsk->cputime_expires.virt_exp = cputime_zero; |
1da177e4c Linux-2.6.12-rc2 |
915 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
916 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
917 918 |
struct cpu_timer_list, entry); |
e80eda94d Posix timers: lim... |
919 |
if (!--maxfire || cputime_lt(virt_ticks(tsk), t->expires.cpu)) { |
f06febc96 timers: fix itime... |
920 |
tsk->cputime_expires.virt_exp = t->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
921 922 923 924 925 926 927 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } ++timers; |
e80eda94d Posix timers: lim... |
928 |
maxfire = 20; |
f06febc96 timers: fix itime... |
929 |
tsk->cputime_expires.sched_exp = 0; |
1da177e4c Linux-2.6.12-rc2 |
930 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
931 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
932 933 |
struct cpu_timer_list, entry); |
41b86e9c5 sched: make posix... |
934 |
if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) { |
f06febc96 timers: fix itime... |
935 |
tsk->cputime_expires.sched_exp = t->expires.sched; |
1da177e4c Linux-2.6.12-rc2 |
936 937 938 939 940 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } |
78f2c7db6 sched: SCHED_FIFO... |
941 942 943 944 |
/* * Check for the special case thread timers. */ |
78d7d407b kernel core: use ... |
945 |
soft = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur); |
d4bb52743 posix-cpu-timers:... |
946 |
if (soft != RLIM_INFINITY) { |
78d7d407b kernel core: use ... |
947 948 |
unsigned long hard = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max); |
78f2c7db6 sched: SCHED_FIFO... |
949 |
|
5a52dd500 sched: rt-watchdo... |
950 951 |
if (hard != RLIM_INFINITY && tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { |
78f2c7db6 sched: SCHED_FIFO... |
952 953 954 955 956 957 958 |
/* * At the hard limit, we just die. * No need to calculate anything else now. */ __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); return; } |
d4bb52743 posix-cpu-timers:... |
959 |
if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) { |
78f2c7db6 sched: SCHED_FIFO... |
960 961 962 |
/* * At the soft limit, send a SIGXCPU every second. */ |
d4bb52743 posix-cpu-timers:... |
963 964 965 |
if (soft < hard) { soft += USEC_PER_SEC; sig->rlim[RLIMIT_RTTIME].rlim_cur = soft; |
78f2c7db6 sched: SCHED_FIFO... |
966 |
} |
81d50bb25 posix-timers: pri... |
967 968 969 970 |
printk(KERN_INFO "RT Watchdog Timeout: %s[%d] ", tsk->comm, task_pid_nr(tsk)); |
78f2c7db6 sched: SCHED_FIFO... |
971 972 973 |
__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); } } |
1da177e4c Linux-2.6.12-rc2 |
974 |
} |
15365c108 posix-cpu-timers:... |
975 |
static void stop_process_timers(struct signal_struct *sig) |
3fccfd67d timers: split pro... |
976 |
{ |
15365c108 posix-cpu-timers:... |
977 |
struct thread_group_cputimer *cputimer = &sig->cputimer; |
3fccfd67d timers: split pro... |
978 |
unsigned long flags; |
3fccfd67d timers: split pro... |
979 980 981 982 |
spin_lock_irqsave(&cputimer->lock, flags); cputimer->running = 0; spin_unlock_irqrestore(&cputimer->lock, flags); } |
8356b5f9c itimers: Fix peri... |
983 |
static u32 onecputick; |
42c4ab41a itimers: Merge IT... |
984 985 986 987 988 989 990 |
static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it, cputime_t *expires, cputime_t cur_time, int signo) { if (cputime_eq(it->expires, cputime_zero)) return; if (cputime_ge(cur_time, it->expires)) { |
8356b5f9c itimers: Fix peri... |
991 992 993 994 995 |
if (!cputime_eq(it->incr, cputime_zero)) { it->expires = cputime_add(it->expires, it->incr); it->error += it->incr_error; if (it->error >= onecputick) { it->expires = cputime_sub(it->expires, |
a42548a18 cputime: Optimize... |
996 |
cputime_one_jiffy); |
8356b5f9c itimers: Fix peri... |
997 998 |
it->error -= onecputick; } |
3f0a525eb itimers: Add trac... |
999 |
} else { |
8356b5f9c itimers: Fix peri... |
1000 |
it->expires = cputime_zero; |
3f0a525eb itimers: Add trac... |
1001 |
} |
42c4ab41a itimers: Merge IT... |
1002 |
|
3f0a525eb itimers: Add trac... |
1003 1004 1005 |
trace_itimer_expire(signo == SIGPROF ? ITIMER_PROF : ITIMER_VIRTUAL, tsk->signal->leader_pid, cur_time); |
42c4ab41a itimers: Merge IT... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 |
__group_send_sig_info(signo, SEND_SIG_PRIV, tsk); } if (!cputime_eq(it->expires, cputime_zero) && (cputime_eq(*expires, cputime_zero) || cputime_lt(it->expires, *expires))) { *expires = it->expires; } } |
29f87b793 posix-cpu-timers:... |
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
/** * task_cputime_zero - Check a task_cputime struct for all zero fields. * * @cputime: The struct to compare. * * Checks @cputime to see if all fields are zero. Returns true if all fields * are zero, false if any field is nonzero. */ static inline int task_cputime_zero(const struct task_cputime *cputime) { if (cputime_eq(cputime->utime, cputime_zero) && cputime_eq(cputime->stime, cputime_zero) && cputime->sum_exec_runtime == 0) return 1; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 1034 1035 1036 1037 1038 |
/* * Check for any per-thread CPU timers that have fired and move them * off the tsk->*_timers list onto the firing list. Per-thread timers * have already been taken off. */ static void check_process_timers(struct task_struct *tsk, struct list_head *firing) { |
e80eda94d Posix timers: lim... |
1039 |
int maxfire; |
1da177e4c Linux-2.6.12-rc2 |
1040 |
struct signal_struct *const sig = tsk->signal; |
f06febc96 timers: fix itime... |
1041 |
cputime_t utime, ptime, virt_expires, prof_expires; |
41b86e9c5 sched: make posix... |
1042 |
unsigned long long sum_sched_runtime, sched_expires; |
1da177e4c Linux-2.6.12-rc2 |
1043 |
struct list_head *timers = sig->cpu_timers; |
f06febc96 timers: fix itime... |
1044 |
struct task_cputime cputime; |
d4bb52743 posix-cpu-timers:... |
1045 |
unsigned long soft; |
1da177e4c Linux-2.6.12-rc2 |
1046 1047 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1048 1049 |
* Collect the current process totals. */ |
4cd4c1b40 timers: split pro... |
1050 |
thread_group_cputimer(tsk, &cputime); |
f06febc96 timers: fix itime... |
1051 1052 1053 |
utime = cputime.utime; ptime = cputime_add(utime, cputime.stime); sum_sched_runtime = cputime.sum_exec_runtime; |
e80eda94d Posix timers: lim... |
1054 |
maxfire = 20; |
1da177e4c Linux-2.6.12-rc2 |
1055 1056 |
prof_expires = cputime_zero; while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1057 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1058 1059 |
struct cpu_timer_list, entry); |
ee7dd205b posix-timers: fix... |
1060 1061 |
if (!--maxfire || cputime_lt(ptime, tl->expires.cpu)) { prof_expires = tl->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1062 1063 |
break; } |
ee7dd205b posix-timers: fix... |
1064 1065 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1066 1067 1068 |
} ++timers; |
e80eda94d Posix timers: lim... |
1069 |
maxfire = 20; |
1da177e4c Linux-2.6.12-rc2 |
1070 1071 |
virt_expires = cputime_zero; while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1072 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1073 1074 |
struct cpu_timer_list, entry); |
ee7dd205b posix-timers: fix... |
1075 1076 |
if (!--maxfire || cputime_lt(utime, tl->expires.cpu)) { virt_expires = tl->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1077 1078 |
break; } |
ee7dd205b posix-timers: fix... |
1079 1080 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1081 1082 1083 |
} ++timers; |
e80eda94d Posix timers: lim... |
1084 |
maxfire = 20; |
1da177e4c Linux-2.6.12-rc2 |
1085 1086 |
sched_expires = 0; while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1087 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1088 1089 |
struct cpu_timer_list, entry); |
ee7dd205b posix-timers: fix... |
1090 1091 |
if (!--maxfire || sum_sched_runtime < tl->expires.sched) { sched_expires = tl->expires.sched; |
1da177e4c Linux-2.6.12-rc2 |
1092 1093 |
break; } |
ee7dd205b posix-timers: fix... |
1094 1095 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1096 1097 1098 1099 1100 |
} /* * Check for the special case process timers. */ |
42c4ab41a itimers: Merge IT... |
1101 1102 1103 1104 |
check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_expires, ptime, SIGPROF); check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_expires, utime, SIGVTALRM); |
78d7d407b kernel core: use ... |
1105 |
soft = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur); |
d4bb52743 posix-cpu-timers:... |
1106 |
if (soft != RLIM_INFINITY) { |
1da177e4c Linux-2.6.12-rc2 |
1107 |
unsigned long psecs = cputime_to_secs(ptime); |
78d7d407b kernel core: use ... |
1108 1109 |
unsigned long hard = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_max); |
1da177e4c Linux-2.6.12-rc2 |
1110 |
cputime_t x; |
d4bb52743 posix-cpu-timers:... |
1111 |
if (psecs >= hard) { |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 1115 1116 1117 1118 |
/* * At the hard limit, we just die. * No need to calculate anything else now. */ __group_send_sig_info(SIGKILL, SEND_SIG_PRIV, tsk); return; } |
d4bb52743 posix-cpu-timers:... |
1119 |
if (psecs >= soft) { |
1da177e4c Linux-2.6.12-rc2 |
1120 1121 1122 1123 |
/* * At the soft limit, send a SIGXCPU every second. */ __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); |
d4bb52743 posix-cpu-timers:... |
1124 1125 1126 |
if (soft < hard) { soft++; sig->rlim[RLIMIT_CPU].rlim_cur = soft; |
1da177e4c Linux-2.6.12-rc2 |
1127 1128 |
} } |
d4bb52743 posix-cpu-timers:... |
1129 |
x = secs_to_cputime(soft); |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 1132 1133 1134 |
if (cputime_eq(prof_expires, cputime_zero) || cputime_lt(x, prof_expires)) { prof_expires = x; } } |
29f87b793 posix-cpu-timers:... |
1135 1136 1137 1138 1139 |
sig->cputime_expires.prof_exp = prof_expires; sig->cputime_expires.virt_exp = virt_expires; sig->cputime_expires.sched_exp = sched_expires; if (task_cputime_zero(&sig->cputime_expires)) stop_process_timers(sig); |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
} /* * This is called from the signal code (via do_schedule_next_timer) * when the last timer signal was delivered and we have to reload the timer. */ void posix_cpu_timer_schedule(struct k_itimer *timer) { struct task_struct *p = timer->it.cpu.task; union cpu_time_count now; if (unlikely(p == NULL)) /* * The task was cleaned up already, no future firings. */ |
708f430dc [PATCH] posix-cpu... |
1155 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1156 1157 1158 1159 1160 1161 1162 1163 1164 |
/* * Fetch the current sample and update the timer's expiry time. */ if (CPUCLOCK_PERTHREAD(timer->it_clock)) { cpu_clock_sample(timer->it_clock, p, &now); bump_cpu_timer(timer, now); if (unlikely(p->exit_state)) { clear_dead_task(timer, now); |
708f430dc [PATCH] posix-cpu... |
1165 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 |
} read_lock(&tasklist_lock); /* arm_timer needs it. */ |
c28739375 cpu-timers: Avoid... |
1168 |
spin_lock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1169 1170 |
} else { read_lock(&tasklist_lock); |
d30fda355 posix-cpu-timers:... |
1171 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
1172 1173 1174 1175 1176 1177 1178 |
/* * The process has been reaped. * We can't even collect a sample any more. */ put_task_struct(p); timer->it.cpu.task = p = NULL; timer->it.cpu.expires.sched = 0; |
708f430dc [PATCH] posix-cpu... |
1179 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1180 1181 1182 1183 1184 1185 1186 |
} else if (unlikely(p->exit_state) && thread_group_empty(p)) { /* * We've noticed that the thread is dead, but * not yet reaped. Take this opportunity to * drop our task ref. */ clear_dead_task(timer, now); |
708f430dc [PATCH] posix-cpu... |
1187 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1188 |
} |
c28739375 cpu-timers: Avoid... |
1189 |
spin_lock(&p->sighand->siglock); |
3997ad317 timers: more cons... |
1190 |
cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4c Linux-2.6.12-rc2 |
1191 1192 1193 1194 1195 1196 1197 |
bump_cpu_timer(timer, now); /* Leave the tasklist_lock locked for the call below. */ } /* * Now re-arm for the new expiry time. */ |
c28739375 cpu-timers: Avoid... |
1198 |
BUG_ON(!irqs_disabled()); |
5eb9aa641 cpu-timers: Clean... |
1199 |
arm_timer(timer); |
c28739375 cpu-timers: Avoid... |
1200 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1201 |
|
708f430dc [PATCH] posix-cpu... |
1202 |
out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
1203 |
read_unlock(&tasklist_lock); |
708f430dc [PATCH] posix-cpu... |
1204 1205 1206 1207 1208 |
out: timer->it_overrun_last = timer->it_overrun; timer->it_overrun = -1; ++timer->it_requeue_pending; |
1da177e4c Linux-2.6.12-rc2 |
1209 |
} |
f06febc96 timers: fix itime... |
1210 |
/** |
f06febc96 timers: fix itime... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 |
* task_cputime_expired - Compare two task_cputime entities. * * @sample: The task_cputime structure to be checked for expiration. * @expires: Expiration times, against which @sample will be checked. * * Checks @sample against @expires to see if any field of @sample has expired. * Returns true if any field of the former is greater than the corresponding * field of the latter if the latter field is set. Otherwise returns false. */ static inline int task_cputime_expired(const struct task_cputime *sample, const struct task_cputime *expires) { if (!cputime_eq(expires->utime, cputime_zero) && cputime_ge(sample->utime, expires->utime)) return 1; if (!cputime_eq(expires->stime, cputime_zero) && cputime_ge(cputime_add(sample->utime, sample->stime), expires->stime)) return 1; if (expires->sum_exec_runtime != 0 && sample->sum_exec_runtime >= expires->sum_exec_runtime) return 1; return 0; } /** * fastpath_timer_check - POSIX CPU timers fast path. * * @tsk: The task (thread) being checked. |
f06febc96 timers: fix itime... |
1240 |
* |
bb34d92f6 timers: fix itime... |
1241 1242 1243 1244 |
* Check the task and thread group timers. If both are zero (there are no * timers set) return false. Otherwise snapshot the task and thread group * timers and compare them with the corresponding expiration times. Return * true if a timer has expired, else return false. |
f06febc96 timers: fix itime... |
1245 |
*/ |
bb34d92f6 timers: fix itime... |
1246 |
static inline int fastpath_timer_check(struct task_struct *tsk) |
f06febc96 timers: fix itime... |
1247 |
{ |
ad133ba3d sched, signals: f... |
1248 |
struct signal_struct *sig; |
bb34d92f6 timers: fix itime... |
1249 |
|
bb34d92f6 timers: fix itime... |
1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 |
if (!task_cputime_zero(&tsk->cputime_expires)) { struct task_cputime task_sample = { .utime = tsk->utime, .stime = tsk->stime, .sum_exec_runtime = tsk->se.sum_exec_runtime }; if (task_cputime_expired(&task_sample, &tsk->cputime_expires)) return 1; } |
ad133ba3d sched, signals: f... |
1260 1261 |
sig = tsk->signal; |
29f87b793 posix-cpu-timers:... |
1262 |
if (sig->cputimer.running) { |
bb34d92f6 timers: fix itime... |
1263 |
struct task_cputime group_sample; |
8d1f431cb sched: Fix the ra... |
1264 1265 1266 |
spin_lock(&sig->cputimer.lock); group_sample = sig->cputimer.cputime; spin_unlock(&sig->cputimer.lock); |
bb34d92f6 timers: fix itime... |
1267 1268 1269 |
if (task_cputime_expired(&group_sample, &sig->cputime_expires)) return 1; } |
37bebc70d posix timers: fix... |
1270 |
|
f55db6090 cpu-timers: Simpl... |
1271 |
return 0; |
f06febc96 timers: fix itime... |
1272 |
} |
1da177e4c Linux-2.6.12-rc2 |
1273 1274 1275 1276 1277 1278 1279 1280 1281 |
/* * This is called from the timer interrupt handler. The irq handler has * already updated our counts. We need to check if any timers fire now. * Interrupts are disabled. */ void run_posix_cpu_timers(struct task_struct *tsk) { LIST_HEAD(firing); struct k_itimer *timer, *next; |
0bdd2ed41 sched: run_posix_... |
1282 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
1283 1284 |
BUG_ON(!irqs_disabled()); |
1da177e4c Linux-2.6.12-rc2 |
1285 |
/* |
f06febc96 timers: fix itime... |
1286 |
* The fast path checks that there are no expired thread or thread |
bb34d92f6 timers: fix itime... |
1287 |
* group timers. If that's so, just return. |
1da177e4c Linux-2.6.12-rc2 |
1288 |
*/ |
bb34d92f6 timers: fix itime... |
1289 |
if (!fastpath_timer_check(tsk)) |
f06febc96 timers: fix itime... |
1290 |
return; |
5ce73a4a5 timers: fix itime... |
1291 |
|
0bdd2ed41 sched: run_posix_... |
1292 1293 |
if (!lock_task_sighand(tsk, &flags)) return; |
bb34d92f6 timers: fix itime... |
1294 1295 1296 1297 1298 1299 |
/* * Here we take off tsk->signal->cpu_timers[N] and * tsk->cpu_timers[N] all the timers that are firing, and * put them on the firing list. */ check_thread_timers(tsk, &firing); |
29f87b793 posix-cpu-timers:... |
1300 1301 1302 1303 1304 1305 |
/* * If there are any active process wide timers (POSIX 1.b, itimers, * RLIMIT_CPU) cputimer must be running. */ if (tsk->signal->cputimer.running) check_process_timers(tsk, &firing); |
1da177e4c Linux-2.6.12-rc2 |
1306 |
|
bb34d92f6 timers: fix itime... |
1307 1308 1309 1310 1311 1312 1313 1314 |
/* * We must release these locks before taking any timer's lock. * There is a potential race with timer deletion here, as the * siglock now protects our private firing list. We have set * the firing flag in each timer, so that a deletion attempt * that gets the timer lock before we do will give it up and * spin until we've taken care of that timer below. */ |
0bdd2ed41 sched: run_posix_... |
1315 |
unlock_task_sighand(tsk, &flags); |
1da177e4c Linux-2.6.12-rc2 |
1316 1317 1318 |
/* * Now that all the timers on our list have the firing flag, |
25985edce Fix common misspe... |
1319 |
* no one will touch their list entries but us. We'll take |
1da177e4c Linux-2.6.12-rc2 |
1320 1321 1322 1323 |
* each timer's lock before clearing its firing flag, so no * timer call will interfere. */ list_for_each_entry_safe(timer, next, &firing, it.cpu.entry) { |
6e85c5ba7 kernel/posix-cpu-... |
1324 |
int cpu_firing; |
1da177e4c Linux-2.6.12-rc2 |
1325 1326 |
spin_lock(&timer->it_lock); list_del_init(&timer->it.cpu.entry); |
6e85c5ba7 kernel/posix-cpu-... |
1327 |
cpu_firing = timer->it.cpu.firing; |
1da177e4c Linux-2.6.12-rc2 |
1328 1329 1330 1331 1332 1333 |
timer->it.cpu.firing = 0; /* * The firing flag is -1 if we collided with a reset * of the timer, which already reported this * almost-firing as an overrun. So don't generate an event. */ |
6e85c5ba7 kernel/posix-cpu-... |
1334 |
if (likely(cpu_firing >= 0)) |
1da177e4c Linux-2.6.12-rc2 |
1335 |
cpu_timer_fire(timer); |
1da177e4c Linux-2.6.12-rc2 |
1336 1337 1338 1339 1340 |
spin_unlock(&timer->it_lock); } } /* |
f55db6090 cpu-timers: Simpl... |
1341 |
* Set one of the process-wide special case CPU timers or RLIMIT_CPU. |
f06febc96 timers: fix itime... |
1342 |
* The tsk->sighand->siglock must be held by the caller. |
1da177e4c Linux-2.6.12-rc2 |
1343 1344 1345 1346 1347 |
*/ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clock_idx, cputime_t *newval, cputime_t *oldval) { union cpu_time_count now; |
1da177e4c Linux-2.6.12-rc2 |
1348 1349 |
BUG_ON(clock_idx == CPUCLOCK_SCHED); |
4cd4c1b40 timers: split pro... |
1350 |
cpu_timer_sample_group(clock_idx, tsk, &now); |
1da177e4c Linux-2.6.12-rc2 |
1351 1352 |
if (oldval) { |
f55db6090 cpu-timers: Simpl... |
1353 1354 1355 1356 1357 |
/* * We are setting itimer. The *oldval is absolute and we update * it to be relative, *newval argument is relative and we update * it to be absolute. */ |
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 |
if (!cputime_eq(*oldval, cputime_zero)) { if (cputime_le(*oldval, now.cpu)) { /* Just about to fire. */ |
a42548a18 cputime: Optimize... |
1361 |
*oldval = cputime_one_jiffy; |
1da177e4c Linux-2.6.12-rc2 |
1362 1363 1364 1365 1366 1367 1368 1369 |
} else { *oldval = cputime_sub(*oldval, now.cpu); } } if (cputime_eq(*newval, cputime_zero)) return; *newval = cputime_add(*newval, now.cpu); |
1da177e4c Linux-2.6.12-rc2 |
1370 1371 1372 |
} /* |
f55db6090 cpu-timers: Simpl... |
1373 1374 |
* Update expiration cache if we are the earliest timer, or eventually * RLIMIT_CPU limit is earlier than prof_exp cpu timer expire. |
1da177e4c Linux-2.6.12-rc2 |
1375 |
*/ |
f55db6090 cpu-timers: Simpl... |
1376 1377 1378 |
switch (clock_idx) { case CPUCLOCK_PROF: if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval)) |
f06febc96 timers: fix itime... |
1379 |
tsk->signal->cputime_expires.prof_exp = *newval; |
f55db6090 cpu-timers: Simpl... |
1380 1381 1382 |
break; case CPUCLOCK_VIRT: if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval)) |
f06febc96 timers: fix itime... |
1383 |
tsk->signal->cputime_expires.virt_exp = *newval; |
f55db6090 cpu-timers: Simpl... |
1384 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1385 1386 |
} } |
e4b765551 [PATCH] posix-tim... |
1387 1388 |
static int do_cpu_nanosleep(const clockid_t which_clock, int flags, struct timespec *rqtp, struct itimerspec *it) |
1da177e4c Linux-2.6.12-rc2 |
1389 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1390 1391 1392 1393 |
struct k_itimer timer; int error; /* |
1da177e4c Linux-2.6.12-rc2 |
1394 1395 1396 1397 1398 1399 1400 1401 1402 |
* Set up a temporary timer and then wait for it to go off. */ memset(&timer, 0, sizeof timer); spin_lock_init(&timer.it_lock); timer.it_clock = which_clock; timer.it_overrun = -1; error = posix_cpu_timer_create(&timer); timer.it_process = current; if (!error) { |
1da177e4c Linux-2.6.12-rc2 |
1403 |
static struct itimerspec zero_it; |
e4b765551 [PATCH] posix-tim... |
1404 1405 1406 |
memset(it, 0, sizeof *it); it->it_value = *rqtp; |
1da177e4c Linux-2.6.12-rc2 |
1407 1408 |
spin_lock_irq(&timer.it_lock); |
e4b765551 [PATCH] posix-tim... |
1409 |
error = posix_cpu_timer_set(&timer, flags, it, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 |
if (error) { spin_unlock_irq(&timer.it_lock); return error; } while (!signal_pending(current)) { if (timer.it.cpu.expires.sched == 0) { /* * Our timer fired and was reset. */ spin_unlock_irq(&timer.it_lock); return 0; } /* * Block until cpu_timer_fire (or a signal) wakes us. */ __set_current_state(TASK_INTERRUPTIBLE); spin_unlock_irq(&timer.it_lock); schedule(); spin_lock_irq(&timer.it_lock); } /* * We were interrupted by a signal. */ sample_to_timespec(which_clock, timer.it.cpu.expires, rqtp); |
e4b765551 [PATCH] posix-tim... |
1437 |
posix_cpu_timer_set(&timer, 0, &zero_it, it); |
1da177e4c Linux-2.6.12-rc2 |
1438 |
spin_unlock_irq(&timer.it_lock); |
e4b765551 [PATCH] posix-tim... |
1439 |
if ((it->it_value.tv_sec | it->it_value.tv_nsec) == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1440 1441 1442 1443 1444 |
/* * It actually did fire already. */ return 0; } |
e4b765551 [PATCH] posix-tim... |
1445 1446 1447 1448 1449 |
error = -ERESTART_RESTARTBLOCK; } return error; } |
bc2c8ea48 posix-timers: Mak... |
1450 1451 1452 1453 |
static long posix_cpu_nsleep_restart(struct restart_block *restart_block); static int posix_cpu_nsleep(const clockid_t which_clock, int flags, struct timespec *rqtp, struct timespec __user *rmtp) |
e4b765551 [PATCH] posix-tim... |
1454 1455 |
{ struct restart_block *restart_block = |
3751f9f29 posix-timers: Cle... |
1456 |
¤t_thread_info()->restart_block; |
e4b765551 [PATCH] posix-tim... |
1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 |
struct itimerspec it; int error; /* * Diagnose required errors first. */ if (CPUCLOCK_PERTHREAD(which_clock) && (CPUCLOCK_PID(which_clock) == 0 || CPUCLOCK_PID(which_clock) == current->pid)) return -EINVAL; error = do_cpu_nanosleep(which_clock, flags, rqtp, &it); if (error == -ERESTART_RESTARTBLOCK) { |
3751f9f29 posix-timers: Cle... |
1471 |
if (flags & TIMER_ABSTIME) |
e4b765551 [PATCH] posix-tim... |
1472 |
return -ERESTARTNOHAND; |
1da177e4c Linux-2.6.12-rc2 |
1473 |
/* |
3751f9f29 posix-timers: Cle... |
1474 1475 1476 |
* Report back to the user the time still remaining. */ if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) |
1da177e4c Linux-2.6.12-rc2 |
1477 |
return -EFAULT; |
1711ef386 [PATCH] posix-tim... |
1478 |
restart_block->fn = posix_cpu_nsleep_restart; |
ab8177bc5 hrtimers: Avoid t... |
1479 |
restart_block->nanosleep.clockid = which_clock; |
3751f9f29 posix-timers: Cle... |
1480 1481 |
restart_block->nanosleep.rmtp = rmtp; restart_block->nanosleep.expires = timespec_to_ns(rqtp); |
1da177e4c Linux-2.6.12-rc2 |
1482 |
} |
1da177e4c Linux-2.6.12-rc2 |
1483 1484 |
return error; } |
bc2c8ea48 posix-timers: Mak... |
1485 |
static long posix_cpu_nsleep_restart(struct restart_block *restart_block) |
1da177e4c Linux-2.6.12-rc2 |
1486 |
{ |
ab8177bc5 hrtimers: Avoid t... |
1487 |
clockid_t which_clock = restart_block->nanosleep.clockid; |
97735f25d [PATCH] hrtimer: ... |
1488 |
struct timespec t; |
e4b765551 [PATCH] posix-tim... |
1489 1490 |
struct itimerspec it; int error; |
97735f25d [PATCH] hrtimer: ... |
1491 |
|
3751f9f29 posix-timers: Cle... |
1492 |
t = ns_to_timespec(restart_block->nanosleep.expires); |
97735f25d [PATCH] hrtimer: ... |
1493 |
|
e4b765551 [PATCH] posix-tim... |
1494 1495 1496 |
error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it); if (error == -ERESTART_RESTARTBLOCK) { |
3751f9f29 posix-timers: Cle... |
1497 |
struct timespec __user *rmtp = restart_block->nanosleep.rmtp; |
e4b765551 [PATCH] posix-tim... |
1498 |
/* |
3751f9f29 posix-timers: Cle... |
1499 1500 1501 |
* Report back to the user the time still remaining. */ if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) |
e4b765551 [PATCH] posix-tim... |
1502 |
return -EFAULT; |
3751f9f29 posix-timers: Cle... |
1503 |
restart_block->nanosleep.expires = timespec_to_ns(&t); |
e4b765551 [PATCH] posix-tim... |
1504 1505 |
} return error; |
1da177e4c Linux-2.6.12-rc2 |
1506 |
} |
1da177e4c Linux-2.6.12-rc2 |
1507 1508 |
#define PROCESS_CLOCK MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED) #define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED) |
a924b04dd [PATCH] hrtimer: ... |
1509 1510 |
static int process_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1511 1512 1513 |
{ return posix_cpu_clock_getres(PROCESS_CLOCK, tp); } |
a924b04dd [PATCH] hrtimer: ... |
1514 1515 |
static int process_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1516 1517 1518 1519 1520 1521 1522 1523 |
{ return posix_cpu_clock_get(PROCESS_CLOCK, tp); } static int process_cpu_timer_create(struct k_itimer *timer) { timer->it_clock = PROCESS_CLOCK; return posix_cpu_timer_create(timer); } |
a924b04dd [PATCH] hrtimer: ... |
1524 |
static int process_cpu_nsleep(const clockid_t which_clock, int flags, |
97735f25d [PATCH] hrtimer: ... |
1525 1526 |
struct timespec *rqtp, struct timespec __user *rmtp) |
1da177e4c Linux-2.6.12-rc2 |
1527 |
{ |
97735f25d [PATCH] hrtimer: ... |
1528 |
return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp); |
1da177e4c Linux-2.6.12-rc2 |
1529 |
} |
1711ef386 [PATCH] posix-tim... |
1530 1531 1532 1533 |
static long process_cpu_nsleep_restart(struct restart_block *restart_block) { return -EINVAL; } |
a924b04dd [PATCH] hrtimer: ... |
1534 1535 |
static int thread_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1536 1537 1538 |
{ return posix_cpu_clock_getres(THREAD_CLOCK, tp); } |
a924b04dd [PATCH] hrtimer: ... |
1539 1540 |
static int thread_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1541 1542 1543 1544 1545 1546 1547 1548 |
{ return posix_cpu_clock_get(THREAD_CLOCK, tp); } static int thread_cpu_timer_create(struct k_itimer *timer) { timer->it_clock = THREAD_CLOCK; return posix_cpu_timer_create(timer); } |
1da177e4c Linux-2.6.12-rc2 |
1549 |
|
1976945ee posix-timers: Int... |
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 |
struct k_clock clock_posix_cpu = { .clock_getres = posix_cpu_clock_getres, .clock_set = posix_cpu_clock_set, .clock_get = posix_cpu_clock_get, .timer_create = posix_cpu_timer_create, .nsleep = posix_cpu_nsleep, .nsleep_restart = posix_cpu_nsleep_restart, .timer_set = posix_cpu_timer_set, .timer_del = posix_cpu_timer_del, .timer_get = posix_cpu_timer_get, }; |
1da177e4c Linux-2.6.12-rc2 |
1561 1562 1563 |
static __init int init_posix_cpu_timers(void) { struct k_clock process = { |
2fd1f0408 posix-timers: Cle... |
1564 1565 |
.clock_getres = process_cpu_clock_getres, .clock_get = process_cpu_clock_get, |
2fd1f0408 posix-timers: Cle... |
1566 1567 1568 |
.timer_create = process_cpu_timer_create, .nsleep = process_cpu_nsleep, .nsleep_restart = process_cpu_nsleep_restart, |
1da177e4c Linux-2.6.12-rc2 |
1569 1570 |
}; struct k_clock thread = { |
2fd1f0408 posix-timers: Cle... |
1571 1572 |
.clock_getres = thread_cpu_clock_getres, .clock_get = thread_cpu_clock_get, |
2fd1f0408 posix-timers: Cle... |
1573 |
.timer_create = thread_cpu_timer_create, |
1da177e4c Linux-2.6.12-rc2 |
1574 |
}; |
8356b5f9c itimers: Fix peri... |
1575 |
struct timespec ts; |
1da177e4c Linux-2.6.12-rc2 |
1576 |
|
527087374 posix-timers: Cle... |
1577 1578 |
posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process); posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread); |
1da177e4c Linux-2.6.12-rc2 |
1579 |
|
a42548a18 cputime: Optimize... |
1580 |
cputime_to_timespec(cputime_one_jiffy, &ts); |
8356b5f9c itimers: Fix peri... |
1581 1582 |
onecputick = ts.tv_nsec; WARN_ON(ts.tv_sec != 0); |
1da177e4c Linux-2.6.12-rc2 |
1583 1584 1585 |
return 0; } __initcall(init_posix_cpu_timers); |