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kernel/posix-cpu-timers.c
41.1 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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/* |
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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 { |
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return now.cpu < then.cpu; |
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} } |
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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 { |
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acc->cpu += val.cpu; |
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} } |
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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 { |
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a.cpu -= b.cpu; |
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} return a; } /* * 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; |
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if (now.cpu < timer->it.cpu.expires.cpu) |
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return; incr = timer->it.cpu.incr.cpu; |
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delta = now.cpu + incr - timer->it.cpu.expires.cpu; |
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/* Don't use (incr*2 < delta), incr*2 might overflow. */ |
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for (i = 0; incr < delta - incr; i++) incr += incr; for (; i >= 0; incr = incr >> 1, i--) { if (delta < incr) |
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continue; |
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timer->it.cpu.expires.cpu += incr; |
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timer->it_overrun += 1 << i; |
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delta -= incr; |
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} } } static inline cputime_t prof_ticks(struct task_struct *p) { |
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return p->utime + p->stime; |
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} 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 { |
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times->utime += t->utime; 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) { |
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if (b->utime > a->utime) |
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a->utime = b->utime; |
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if (b->stime > a->stime) |
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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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raw_spin_lock_irqsave(&cputimer->lock, flags); |
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cputimer->running = 1; |
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update_gt_cputime(&cputimer->cputime, &sum); |
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} else |
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raw_spin_lock_irqsave(&cputimer->lock, flags); |
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*times = cputimer->cputime; |
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raw_spin_unlock_irqrestore(&cputimer->lock, flags); |
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} |
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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.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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|
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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; |
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cputime_t ptime = utime + stime; |
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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.cpu < ptime) { timer->expires.cpu = 0; |
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} else { |
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timer->expires.cpu -= ptime; |
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} } ++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.cpu < utime) { timer->expires.cpu = 0; |
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} else { |
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timer->expires.cpu -= utime; |
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} } ++head; list_for_each_entry_safe(timer, next, head, entry) { |
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list_del_init(&timer->entry); |
41b86e9c5 sched: make posix... |
467 |
if (timer->expires.sched < sum_exec_runtime) { |
1da177e4c Linux-2.6.12-rc2 |
468 469 |
timer->expires.sched = 0; } else { |
41b86e9c5 sched: make posix... |
470 |
timer->expires.sched -= sum_exec_runtime; |
1da177e4c Linux-2.6.12-rc2 |
471 472 473 474 475 476 477 478 479 480 481 482 |
} } } /* * 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, |
41b86e9c5 sched: make posix... |
483 |
tsk->utime, tsk->stime, tsk->se.sum_exec_runtime); |
1da177e4c Linux-2.6.12-rc2 |
484 485 486 487 |
} void posix_cpu_timers_exit_group(struct task_struct *tsk) { |
17d42c1c4 posix_cpu_timers_... |
488 |
struct signal_struct *const sig = tsk->signal; |
ca531a0a5 [PATCH] posix-tim... |
489 |
|
f06febc96 timers: fix itime... |
490 |
cleanup_timers(tsk->signal->cpu_timers, |
648616343 [S390] cputime: a... |
491 |
tsk->utime + sig->utime, tsk->stime + sig->stime, |
17d42c1c4 posix_cpu_timers_... |
492 |
tsk->se.sum_exec_runtime + sig->sum_sched_runtime); |
1da177e4c Linux-2.6.12-rc2 |
493 494 495 496 497 498 499 500 501 502 503 504 505 506 |
} 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... |
507 508 |
static inline int expires_gt(cputime_t expires, cputime_t new_exp) { |
648616343 [S390] cputime: a... |
509 |
return expires == 0 || expires > new_exp; |
d1e3b6d19 itimers: Simplify... |
510 |
} |
1da177e4c Linux-2.6.12-rc2 |
511 512 513 |
/* * 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... |
514 |
* for reading, interrupts disabled and p->sighand->siglock taken. |
1da177e4c Linux-2.6.12-rc2 |
515 |
*/ |
5eb9aa641 cpu-timers: Clean... |
516 |
static void arm_timer(struct k_itimer *timer) |
1da177e4c Linux-2.6.12-rc2 |
517 518 519 |
{ struct task_struct *p = timer->it.cpu.task; struct list_head *head, *listpos; |
5eb9aa641 cpu-timers: Clean... |
520 |
struct task_cputime *cputime_expires; |
1da177e4c Linux-2.6.12-rc2 |
521 522 |
struct cpu_timer_list *const nt = &timer->it.cpu; struct cpu_timer_list *next; |
1da177e4c Linux-2.6.12-rc2 |
523 |
|
5eb9aa641 cpu-timers: Clean... |
524 525 526 527 528 529 530 |
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 |
531 |
head += CPUCLOCK_WHICH(timer->it_clock); |
1da177e4c Linux-2.6.12-rc2 |
532 |
listpos = head; |
5eb9aa641 cpu-timers: Clean... |
533 534 535 536 |
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 |
537 538 539 540 |
} list_add(&nt->entry, listpos); if (listpos == head) { |
5eb9aa641 cpu-timers: Clean... |
541 |
union cpu_time_count *exp = &nt->expires; |
1da177e4c Linux-2.6.12-rc2 |
542 |
/* |
5eb9aa641 cpu-timers: Clean... |
543 544 545 546 |
* 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 |
547 |
*/ |
5eb9aa641 cpu-timers: Clean... |
548 549 550 551 552 553 554 555 556 557 558 559 560 561 |
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 |
562 563 |
} } |
1da177e4c Linux-2.6.12-rc2 |
564 565 566 567 568 569 570 |
} /* * The timer is locked, fire it and arrange for its reload. */ static void cpu_timer_fire(struct k_itimer *timer) { |
1f169f84d cpu-timers: Chang... |
571 572 573 574 575 576 |
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 |
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 |
/* * 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... |
601 602 603 604 605 606 607 608 609 610 611 612 613 614 |
* 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: |
648616343 [S390] cputime: a... |
615 |
cpu->cpu = cputime.utime + cputime.stime; |
3997ad317 timers: more cons... |
616 617 618 619 620 621 622 623 624 625 626 627 |
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 |
628 629 630 631 632 |
* 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... |
633 634 |
static int posix_cpu_timer_set(struct k_itimer *timer, int flags, struct itimerspec *new, struct itimerspec *old) |
1da177e4c Linux-2.6.12-rc2 |
635 636 |
{ struct task_struct *p = timer->it.cpu.task; |
ae1a78eec cpu-timers: Retur... |
637 |
union cpu_time_count old_expires, new_expires, old_incr, val; |
1da177e4c Linux-2.6.12-rc2 |
638 639 640 641 642 643 644 645 646 647 648 649 650 651 |
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:... |
652 |
* clears p->sighand. If p has just been reaped, we can no |
1da177e4c Linux-2.6.12-rc2 |
653 654 |
* longer get any information about it at all. */ |
d30fda355 posix-cpu-timers:... |
655 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
656 657 658 659 660 661 662 663 664 665 |
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... |
666 667 |
ret = 0; |
ae1a78eec cpu-timers: Retur... |
668 |
old_incr = timer->it.cpu.incr; |
1da177e4c Linux-2.6.12-rc2 |
669 670 |
spin_lock(&p->sighand->siglock); old_expires = timer->it.cpu.expires; |
a69ac4a78 [PATCH] posix-tim... |
671 672 673 674 675 |
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 |
676 677 678 679 680 681 682 683 684 685 686 687 |
/* * 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... |
688 |
cpu_timer_sample_group(timer->it_clock, p, &val); |
1da177e4c Linux-2.6.12-rc2 |
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 |
} 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... |
721 |
if (unlikely(ret)) { |
1da177e4c Linux-2.6.12-rc2 |
722 723 724 725 726 727 |
/* * 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... |
728 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
729 |
read_unlock(&tasklist_lock); |
1da177e4c Linux-2.6.12-rc2 |
730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
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 |
744 |
cpu_time_before(timer->it_clock, val, new_expires)) { |
5eb9aa641 cpu-timers: Clean... |
745 |
arm_timer(timer); |
1da177e4c Linux-2.6.12-rc2 |
746 |
} |
c28739375 cpu-timers: Avoid... |
747 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 |
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 |
768 769 770 771 772 773 774 775 776 777 778 779 780 |
!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... |
781 |
old_incr, &old->it_interval); |
1da177e4c Linux-2.6.12-rc2 |
782 783 784 |
} return ret; } |
bc2c8ea48 posix-timers: Mak... |
785 |
static void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) |
1da177e4c Linux-2.6.12-rc2 |
786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 |
{ 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:... |
821 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
822 823 824 825 826 827 828 829 830 831 832 |
/* * 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... |
833 |
cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 838 |
clear_dead = (unlikely(p->exit_state) && thread_group_empty(p)); } read_unlock(&tasklist_lock); } |
1da177e4c Linux-2.6.12-rc2 |
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 |
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... |
872 |
int maxfire; |
1da177e4c Linux-2.6.12-rc2 |
873 |
struct list_head *timers = tsk->cpu_timers; |
78f2c7db6 sched: SCHED_FIFO... |
874 |
struct signal_struct *const sig = tsk->signal; |
d4bb52743 posix-cpu-timers:... |
875 |
unsigned long soft; |
1da177e4c Linux-2.6.12-rc2 |
876 |
|
e80eda94d Posix timers: lim... |
877 |
maxfire = 20; |
648616343 [S390] cputime: a... |
878 |
tsk->cputime_expires.prof_exp = 0; |
1da177e4c Linux-2.6.12-rc2 |
879 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
880 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
881 882 |
struct cpu_timer_list, entry); |
648616343 [S390] cputime: a... |
883 |
if (!--maxfire || prof_ticks(tsk) < t->expires.cpu) { |
f06febc96 timers: fix itime... |
884 |
tsk->cputime_expires.prof_exp = t->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
885 886 887 888 889 890 891 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } ++timers; |
e80eda94d Posix timers: lim... |
892 |
maxfire = 20; |
648616343 [S390] cputime: a... |
893 |
tsk->cputime_expires.virt_exp = 0; |
1da177e4c Linux-2.6.12-rc2 |
894 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
895 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
896 897 |
struct cpu_timer_list, entry); |
648616343 [S390] cputime: a... |
898 |
if (!--maxfire || virt_ticks(tsk) < t->expires.cpu) { |
f06febc96 timers: fix itime... |
899 |
tsk->cputime_expires.virt_exp = t->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
900 901 902 903 904 905 906 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } ++timers; |
e80eda94d Posix timers: lim... |
907 |
maxfire = 20; |
f06febc96 timers: fix itime... |
908 |
tsk->cputime_expires.sched_exp = 0; |
1da177e4c Linux-2.6.12-rc2 |
909 |
while (!list_empty(timers)) { |
b5e618181 Introduce a handy... |
910 |
struct cpu_timer_list *t = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
911 912 |
struct cpu_timer_list, entry); |
41b86e9c5 sched: make posix... |
913 |
if (!--maxfire || tsk->se.sum_exec_runtime < t->expires.sched) { |
f06febc96 timers: fix itime... |
914 |
tsk->cputime_expires.sched_exp = t->expires.sched; |
1da177e4c Linux-2.6.12-rc2 |
915 916 917 918 919 |
break; } t->firing = 1; list_move_tail(&t->entry, firing); } |
78f2c7db6 sched: SCHED_FIFO... |
920 921 922 923 |
/* * Check for the special case thread timers. */ |
78d7d407b kernel core: use ... |
924 |
soft = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_cur); |
d4bb52743 posix-cpu-timers:... |
925 |
if (soft != RLIM_INFINITY) { |
78d7d407b kernel core: use ... |
926 927 |
unsigned long hard = ACCESS_ONCE(sig->rlim[RLIMIT_RTTIME].rlim_max); |
78f2c7db6 sched: SCHED_FIFO... |
928 |
|
5a52dd500 sched: rt-watchdo... |
929 930 |
if (hard != RLIM_INFINITY && tsk->rt.timeout > DIV_ROUND_UP(hard, USEC_PER_SEC/HZ)) { |
78f2c7db6 sched: SCHED_FIFO... |
931 932 933 934 935 936 937 |
/* * 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:... |
938 |
if (tsk->rt.timeout > DIV_ROUND_UP(soft, USEC_PER_SEC/HZ)) { |
78f2c7db6 sched: SCHED_FIFO... |
939 940 941 |
/* * At the soft limit, send a SIGXCPU every second. */ |
d4bb52743 posix-cpu-timers:... |
942 943 944 |
if (soft < hard) { soft += USEC_PER_SEC; sig->rlim[RLIMIT_RTTIME].rlim_cur = soft; |
78f2c7db6 sched: SCHED_FIFO... |
945 |
} |
81d50bb25 posix-timers: pri... |
946 947 948 949 |
printk(KERN_INFO "RT Watchdog Timeout: %s[%d] ", tsk->comm, task_pid_nr(tsk)); |
78f2c7db6 sched: SCHED_FIFO... |
950 951 952 |
__group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); } } |
1da177e4c Linux-2.6.12-rc2 |
953 |
} |
15365c108 posix-cpu-timers:... |
954 |
static void stop_process_timers(struct signal_struct *sig) |
3fccfd67d timers: split pro... |
955 |
{ |
15365c108 posix-cpu-timers:... |
956 |
struct thread_group_cputimer *cputimer = &sig->cputimer; |
3fccfd67d timers: split pro... |
957 |
unsigned long flags; |
ee30a7b2f locking, sched: A... |
958 |
raw_spin_lock_irqsave(&cputimer->lock, flags); |
3fccfd67d timers: split pro... |
959 |
cputimer->running = 0; |
ee30a7b2f locking, sched: A... |
960 |
raw_spin_unlock_irqrestore(&cputimer->lock, flags); |
3fccfd67d timers: split pro... |
961 |
} |
8356b5f9c itimers: Fix peri... |
962 |
static u32 onecputick; |
42c4ab41a itimers: Merge IT... |
963 964 965 |
static void check_cpu_itimer(struct task_struct *tsk, struct cpu_itimer *it, cputime_t *expires, cputime_t cur_time, int signo) { |
648616343 [S390] cputime: a... |
966 |
if (!it->expires) |
42c4ab41a itimers: Merge IT... |
967 |
return; |
648616343 [S390] cputime: a... |
968 969 970 |
if (cur_time >= it->expires) { if (it->incr) { it->expires += it->incr; |
8356b5f9c itimers: Fix peri... |
971 972 |
it->error += it->incr_error; if (it->error >= onecputick) { |
648616343 [S390] cputime: a... |
973 |
it->expires -= cputime_one_jiffy; |
8356b5f9c itimers: Fix peri... |
974 975 |
it->error -= onecputick; } |
3f0a525eb itimers: Add trac... |
976 |
} else { |
648616343 [S390] cputime: a... |
977 |
it->expires = 0; |
3f0a525eb itimers: Add trac... |
978 |
} |
42c4ab41a itimers: Merge IT... |
979 |
|
3f0a525eb itimers: Add trac... |
980 981 982 |
trace_itimer_expire(signo == SIGPROF ? ITIMER_PROF : ITIMER_VIRTUAL, tsk->signal->leader_pid, cur_time); |
42c4ab41a itimers: Merge IT... |
983 984 |
__group_send_sig_info(signo, SEND_SIG_PRIV, tsk); } |
648616343 [S390] cputime: a... |
985 |
if (it->expires && (!*expires || it->expires < *expires)) { |
42c4ab41a itimers: Merge IT... |
986 987 988 |
*expires = it->expires; } } |
29f87b793 posix-cpu-timers:... |
989 990 991 992 993 994 995 996 997 998 |
/** * 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) { |
648616343 [S390] cputime: a... |
999 |
if (!cputime->utime && !cputime->stime && !cputime->sum_exec_runtime) |
29f87b793 posix-cpu-timers:... |
1000 1001 1002 |
return 1; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 1008 1009 1010 |
/* * 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... |
1011 |
int maxfire; |
1da177e4c Linux-2.6.12-rc2 |
1012 |
struct signal_struct *const sig = tsk->signal; |
f06febc96 timers: fix itime... |
1013 |
cputime_t utime, ptime, virt_expires, prof_expires; |
41b86e9c5 sched: make posix... |
1014 |
unsigned long long sum_sched_runtime, sched_expires; |
1da177e4c Linux-2.6.12-rc2 |
1015 |
struct list_head *timers = sig->cpu_timers; |
f06febc96 timers: fix itime... |
1016 |
struct task_cputime cputime; |
d4bb52743 posix-cpu-timers:... |
1017 |
unsigned long soft; |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 |
/* |
1da177e4c Linux-2.6.12-rc2 |
1020 1021 |
* Collect the current process totals. */ |
4cd4c1b40 timers: split pro... |
1022 |
thread_group_cputimer(tsk, &cputime); |
f06febc96 timers: fix itime... |
1023 |
utime = cputime.utime; |
648616343 [S390] cputime: a... |
1024 |
ptime = utime + cputime.stime; |
f06febc96 timers: fix itime... |
1025 |
sum_sched_runtime = cputime.sum_exec_runtime; |
e80eda94d Posix timers: lim... |
1026 |
maxfire = 20; |
648616343 [S390] cputime: a... |
1027 |
prof_expires = 0; |
1da177e4c Linux-2.6.12-rc2 |
1028 |
while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1029 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1030 1031 |
struct cpu_timer_list, entry); |
648616343 [S390] cputime: a... |
1032 |
if (!--maxfire || ptime < tl->expires.cpu) { |
ee7dd205b posix-timers: fix... |
1033 |
prof_expires = tl->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1034 1035 |
break; } |
ee7dd205b posix-timers: fix... |
1036 1037 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 |
} ++timers; |
e80eda94d Posix timers: lim... |
1041 |
maxfire = 20; |
648616343 [S390] cputime: a... |
1042 |
virt_expires = 0; |
1da177e4c Linux-2.6.12-rc2 |
1043 |
while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1044 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1045 1046 |
struct cpu_timer_list, entry); |
648616343 [S390] cputime: a... |
1047 |
if (!--maxfire || utime < tl->expires.cpu) { |
ee7dd205b posix-timers: fix... |
1048 |
virt_expires = tl->expires.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1049 1050 |
break; } |
ee7dd205b posix-timers: fix... |
1051 1052 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1053 1054 1055 |
} ++timers; |
e80eda94d Posix timers: lim... |
1056 |
maxfire = 20; |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 |
sched_expires = 0; while (!list_empty(timers)) { |
ee7dd205b posix-timers: fix... |
1059 |
struct cpu_timer_list *tl = list_first_entry(timers, |
1da177e4c Linux-2.6.12-rc2 |
1060 1061 |
struct cpu_timer_list, entry); |
ee7dd205b posix-timers: fix... |
1062 1063 |
if (!--maxfire || sum_sched_runtime < tl->expires.sched) { sched_expires = tl->expires.sched; |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 |
break; } |
ee7dd205b posix-timers: fix... |
1066 1067 |
tl->firing = 1; list_move_tail(&tl->entry, firing); |
1da177e4c Linux-2.6.12-rc2 |
1068 1069 1070 1071 1072 |
} /* * Check for the special case process timers. */ |
42c4ab41a itimers: Merge IT... |
1073 1074 1075 1076 |
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 ... |
1077 |
soft = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_cur); |
d4bb52743 posix-cpu-timers:... |
1078 |
if (soft != RLIM_INFINITY) { |
1da177e4c Linux-2.6.12-rc2 |
1079 |
unsigned long psecs = cputime_to_secs(ptime); |
78d7d407b kernel core: use ... |
1080 1081 |
unsigned long hard = ACCESS_ONCE(sig->rlim[RLIMIT_CPU].rlim_max); |
1da177e4c Linux-2.6.12-rc2 |
1082 |
cputime_t x; |
d4bb52743 posix-cpu-timers:... |
1083 |
if (psecs >= hard) { |
1da177e4c Linux-2.6.12-rc2 |
1084 1085 1086 1087 1088 1089 1090 |
/* * 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:... |
1091 |
if (psecs >= soft) { |
1da177e4c Linux-2.6.12-rc2 |
1092 1093 1094 1095 |
/* * At the soft limit, send a SIGXCPU every second. */ __group_send_sig_info(SIGXCPU, SEND_SIG_PRIV, tsk); |
d4bb52743 posix-cpu-timers:... |
1096 1097 1098 |
if (soft < hard) { soft++; sig->rlim[RLIMIT_CPU].rlim_cur = soft; |
1da177e4c Linux-2.6.12-rc2 |
1099 1100 |
} } |
d4bb52743 posix-cpu-timers:... |
1101 |
x = secs_to_cputime(soft); |
648616343 [S390] cputime: a... |
1102 |
if (!prof_expires || x < prof_expires) { |
1da177e4c Linux-2.6.12-rc2 |
1103 1104 1105 |
prof_expires = x; } } |
29f87b793 posix-cpu-timers:... |
1106 1107 1108 1109 1110 |
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 |
1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 |
} /* * 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... |
1126 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1127 1128 1129 1130 1131 1132 1133 1134 1135 |
/* * 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... |
1136 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 |
} read_lock(&tasklist_lock); /* arm_timer needs it. */ |
c28739375 cpu-timers: Avoid... |
1139 |
spin_lock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1140 1141 |
} else { read_lock(&tasklist_lock); |
d30fda355 posix-cpu-timers:... |
1142 |
if (unlikely(p->sighand == NULL)) { |
1da177e4c Linux-2.6.12-rc2 |
1143 1144 1145 1146 1147 1148 1149 |
/* * 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... |
1150 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1151 1152 1153 1154 1155 1156 1157 |
} 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... |
1158 |
goto out_unlock; |
1da177e4c Linux-2.6.12-rc2 |
1159 |
} |
c28739375 cpu-timers: Avoid... |
1160 |
spin_lock(&p->sighand->siglock); |
3997ad317 timers: more cons... |
1161 |
cpu_timer_sample_group(timer->it_clock, p, &now); |
1da177e4c Linux-2.6.12-rc2 |
1162 1163 1164 1165 1166 1167 1168 |
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... |
1169 |
BUG_ON(!irqs_disabled()); |
5eb9aa641 cpu-timers: Clean... |
1170 |
arm_timer(timer); |
c28739375 cpu-timers: Avoid... |
1171 |
spin_unlock(&p->sighand->siglock); |
1da177e4c Linux-2.6.12-rc2 |
1172 |
|
708f430dc [PATCH] posix-cpu... |
1173 |
out_unlock: |
1da177e4c Linux-2.6.12-rc2 |
1174 |
read_unlock(&tasklist_lock); |
708f430dc [PATCH] posix-cpu... |
1175 1176 1177 1178 1179 |
out: timer->it_overrun_last = timer->it_overrun; timer->it_overrun = -1; ++timer->it_requeue_pending; |
1da177e4c Linux-2.6.12-rc2 |
1180 |
} |
f06febc96 timers: fix itime... |
1181 |
/** |
f06febc96 timers: fix itime... |
1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 |
* 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) { |
648616343 [S390] cputime: a... |
1194 |
if (expires->utime && sample->utime >= expires->utime) |
f06febc96 timers: fix itime... |
1195 |
return 1; |
648616343 [S390] cputime: a... |
1196 |
if (expires->stime && sample->utime + sample->stime >= expires->stime) |
f06febc96 timers: fix itime... |
1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 |
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... |
1208 |
* |
bb34d92f6 timers: fix itime... |
1209 1210 1211 1212 |
* 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... |
1213 |
*/ |
bb34d92f6 timers: fix itime... |
1214 |
static inline int fastpath_timer_check(struct task_struct *tsk) |
f06febc96 timers: fix itime... |
1215 |
{ |
ad133ba3d sched, signals: f... |
1216 |
struct signal_struct *sig; |
bb34d92f6 timers: fix itime... |
1217 |
|
bb34d92f6 timers: fix itime... |
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 |
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... |
1228 1229 |
sig = tsk->signal; |
29f87b793 posix-cpu-timers:... |
1230 |
if (sig->cputimer.running) { |
bb34d92f6 timers: fix itime... |
1231 |
struct task_cputime group_sample; |
ee30a7b2f locking, sched: A... |
1232 |
raw_spin_lock(&sig->cputimer.lock); |
8d1f431cb sched: Fix the ra... |
1233 |
group_sample = sig->cputimer.cputime; |
ee30a7b2f locking, sched: A... |
1234 |
raw_spin_unlock(&sig->cputimer.lock); |
8d1f431cb sched: Fix the ra... |
1235 |
|
bb34d92f6 timers: fix itime... |
1236 1237 1238 |
if (task_cputime_expired(&group_sample, &sig->cputime_expires)) return 1; } |
37bebc70d posix timers: fix... |
1239 |
|
f55db6090 cpu-timers: Simpl... |
1240 |
return 0; |
f06febc96 timers: fix itime... |
1241 |
} |
1da177e4c Linux-2.6.12-rc2 |
1242 1243 1244 1245 1246 1247 1248 1249 1250 |
/* * 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_... |
1251 |
unsigned long flags; |
1da177e4c Linux-2.6.12-rc2 |
1252 1253 |
BUG_ON(!irqs_disabled()); |
1da177e4c Linux-2.6.12-rc2 |
1254 |
/* |
f06febc96 timers: fix itime... |
1255 |
* The fast path checks that there are no expired thread or thread |
bb34d92f6 timers: fix itime... |
1256 |
* group timers. If that's so, just return. |
1da177e4c Linux-2.6.12-rc2 |
1257 |
*/ |
bb34d92f6 timers: fix itime... |
1258 |
if (!fastpath_timer_check(tsk)) |
f06febc96 timers: fix itime... |
1259 |
return; |
5ce73a4a5 timers: fix itime... |
1260 |
|
0bdd2ed41 sched: run_posix_... |
1261 1262 |
if (!lock_task_sighand(tsk, &flags)) return; |
bb34d92f6 timers: fix itime... |
1263 1264 1265 1266 1267 1268 |
/* * 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:... |
1269 1270 1271 1272 1273 1274 |
/* * 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 |
1275 |
|
bb34d92f6 timers: fix itime... |
1276 1277 1278 1279 1280 1281 1282 1283 |
/* * 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_... |
1284 |
unlock_task_sighand(tsk, &flags); |
1da177e4c Linux-2.6.12-rc2 |
1285 1286 1287 |
/* * Now that all the timers on our list have the firing flag, |
25985edce Fix common misspe... |
1288 |
* no one will touch their list entries but us. We'll take |
1da177e4c Linux-2.6.12-rc2 |
1289 1290 1291 1292 |
* 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-... |
1293 |
int cpu_firing; |
1da177e4c Linux-2.6.12-rc2 |
1294 1295 |
spin_lock(&timer->it_lock); list_del_init(&timer->it.cpu.entry); |
6e85c5ba7 kernel/posix-cpu-... |
1296 |
cpu_firing = timer->it.cpu.firing; |
1da177e4c Linux-2.6.12-rc2 |
1297 1298 1299 1300 1301 1302 |
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-... |
1303 |
if (likely(cpu_firing >= 0)) |
1da177e4c Linux-2.6.12-rc2 |
1304 |
cpu_timer_fire(timer); |
1da177e4c Linux-2.6.12-rc2 |
1305 1306 1307 1308 1309 |
spin_unlock(&timer->it_lock); } } /* |
f55db6090 cpu-timers: Simpl... |
1310 |
* Set one of the process-wide special case CPU timers or RLIMIT_CPU. |
f06febc96 timers: fix itime... |
1311 |
* The tsk->sighand->siglock must be held by the caller. |
1da177e4c Linux-2.6.12-rc2 |
1312 1313 1314 1315 1316 |
*/ 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 |
1317 1318 |
BUG_ON(clock_idx == CPUCLOCK_SCHED); |
4cd4c1b40 timers: split pro... |
1319 |
cpu_timer_sample_group(clock_idx, tsk, &now); |
1da177e4c Linux-2.6.12-rc2 |
1320 1321 |
if (oldval) { |
f55db6090 cpu-timers: Simpl... |
1322 1323 1324 1325 1326 |
/* * 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. */ |
648616343 [S390] cputime: a... |
1327 1328 |
if (*oldval) { if (*oldval <= now.cpu) { |
1da177e4c Linux-2.6.12-rc2 |
1329 |
/* Just about to fire. */ |
a42548a18 cputime: Optimize... |
1330 |
*oldval = cputime_one_jiffy; |
1da177e4c Linux-2.6.12-rc2 |
1331 |
} else { |
648616343 [S390] cputime: a... |
1332 |
*oldval -= now.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1333 1334 |
} } |
648616343 [S390] cputime: a... |
1335 |
if (!*newval) |
1da177e4c Linux-2.6.12-rc2 |
1336 |
return; |
648616343 [S390] cputime: a... |
1337 |
*newval += now.cpu; |
1da177e4c Linux-2.6.12-rc2 |
1338 1339 1340 |
} /* |
f55db6090 cpu-timers: Simpl... |
1341 1342 |
* 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 |
1343 |
*/ |
f55db6090 cpu-timers: Simpl... |
1344 1345 1346 |
switch (clock_idx) { case CPUCLOCK_PROF: if (expires_gt(tsk->signal->cputime_expires.prof_exp, *newval)) |
f06febc96 timers: fix itime... |
1347 |
tsk->signal->cputime_expires.prof_exp = *newval; |
f55db6090 cpu-timers: Simpl... |
1348 1349 1350 |
break; case CPUCLOCK_VIRT: if (expires_gt(tsk->signal->cputime_expires.virt_exp, *newval)) |
f06febc96 timers: fix itime... |
1351 |
tsk->signal->cputime_expires.virt_exp = *newval; |
f55db6090 cpu-timers: Simpl... |
1352 |
break; |
1da177e4c Linux-2.6.12-rc2 |
1353 1354 |
} } |
e4b765551 [PATCH] posix-tim... |
1355 1356 |
static int do_cpu_nanosleep(const clockid_t which_clock, int flags, struct timespec *rqtp, struct itimerspec *it) |
1da177e4c Linux-2.6.12-rc2 |
1357 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1358 1359 1360 1361 |
struct k_itimer timer; int error; /* |
1da177e4c Linux-2.6.12-rc2 |
1362 1363 1364 1365 1366 1367 1368 1369 1370 |
* 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 |
1371 |
static struct itimerspec zero_it; |
e4b765551 [PATCH] posix-tim... |
1372 1373 1374 |
memset(it, 0, sizeof *it); it->it_value = *rqtp; |
1da177e4c Linux-2.6.12-rc2 |
1375 1376 |
spin_lock_irq(&timer.it_lock); |
e4b765551 [PATCH] posix-tim... |
1377 |
error = posix_cpu_timer_set(&timer, flags, it, NULL); |
1da177e4c Linux-2.6.12-rc2 |
1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 |
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... |
1405 |
posix_cpu_timer_set(&timer, 0, &zero_it, it); |
1da177e4c Linux-2.6.12-rc2 |
1406 |
spin_unlock_irq(&timer.it_lock); |
e4b765551 [PATCH] posix-tim... |
1407 |
if ((it->it_value.tv_sec | it->it_value.tv_nsec) == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1408 1409 1410 1411 1412 |
/* * It actually did fire already. */ return 0; } |
e4b765551 [PATCH] posix-tim... |
1413 1414 1415 1416 1417 |
error = -ERESTART_RESTARTBLOCK; } return error; } |
bc2c8ea48 posix-timers: Mak... |
1418 1419 1420 1421 |
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... |
1422 1423 |
{ struct restart_block *restart_block = |
3751f9f29 posix-timers: Cle... |
1424 |
¤t_thread_info()->restart_block; |
e4b765551 [PATCH] posix-tim... |
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 |
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... |
1439 |
if (flags & TIMER_ABSTIME) |
e4b765551 [PATCH] posix-tim... |
1440 |
return -ERESTARTNOHAND; |
1da177e4c Linux-2.6.12-rc2 |
1441 |
/* |
3751f9f29 posix-timers: Cle... |
1442 1443 1444 |
* 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 |
1445 |
return -EFAULT; |
1711ef386 [PATCH] posix-tim... |
1446 |
restart_block->fn = posix_cpu_nsleep_restart; |
ab8177bc5 hrtimers: Avoid t... |
1447 |
restart_block->nanosleep.clockid = which_clock; |
3751f9f29 posix-timers: Cle... |
1448 1449 |
restart_block->nanosleep.rmtp = rmtp; restart_block->nanosleep.expires = timespec_to_ns(rqtp); |
1da177e4c Linux-2.6.12-rc2 |
1450 |
} |
1da177e4c Linux-2.6.12-rc2 |
1451 1452 |
return error; } |
bc2c8ea48 posix-timers: Mak... |
1453 |
static long posix_cpu_nsleep_restart(struct restart_block *restart_block) |
1da177e4c Linux-2.6.12-rc2 |
1454 |
{ |
ab8177bc5 hrtimers: Avoid t... |
1455 |
clockid_t which_clock = restart_block->nanosleep.clockid; |
97735f25d [PATCH] hrtimer: ... |
1456 |
struct timespec t; |
e4b765551 [PATCH] posix-tim... |
1457 1458 |
struct itimerspec it; int error; |
97735f25d [PATCH] hrtimer: ... |
1459 |
|
3751f9f29 posix-timers: Cle... |
1460 |
t = ns_to_timespec(restart_block->nanosleep.expires); |
97735f25d [PATCH] hrtimer: ... |
1461 |
|
e4b765551 [PATCH] posix-tim... |
1462 1463 1464 |
error = do_cpu_nanosleep(which_clock, TIMER_ABSTIME, &t, &it); if (error == -ERESTART_RESTARTBLOCK) { |
3751f9f29 posix-timers: Cle... |
1465 |
struct timespec __user *rmtp = restart_block->nanosleep.rmtp; |
e4b765551 [PATCH] posix-tim... |
1466 |
/* |
3751f9f29 posix-timers: Cle... |
1467 1468 1469 |
* Report back to the user the time still remaining. */ if (rmtp && copy_to_user(rmtp, &it.it_value, sizeof *rmtp)) |
e4b765551 [PATCH] posix-tim... |
1470 |
return -EFAULT; |
3751f9f29 posix-timers: Cle... |
1471 |
restart_block->nanosleep.expires = timespec_to_ns(&t); |
e4b765551 [PATCH] posix-tim... |
1472 1473 |
} return error; |
1da177e4c Linux-2.6.12-rc2 |
1474 |
} |
1da177e4c Linux-2.6.12-rc2 |
1475 1476 |
#define PROCESS_CLOCK MAKE_PROCESS_CPUCLOCK(0, CPUCLOCK_SCHED) #define THREAD_CLOCK MAKE_THREAD_CPUCLOCK(0, CPUCLOCK_SCHED) |
a924b04dd [PATCH] hrtimer: ... |
1477 1478 |
static int process_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1479 1480 1481 |
{ return posix_cpu_clock_getres(PROCESS_CLOCK, tp); } |
a924b04dd [PATCH] hrtimer: ... |
1482 1483 |
static int process_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1484 1485 1486 1487 1488 1489 1490 1491 |
{ 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: ... |
1492 |
static int process_cpu_nsleep(const clockid_t which_clock, int flags, |
97735f25d [PATCH] hrtimer: ... |
1493 1494 |
struct timespec *rqtp, struct timespec __user *rmtp) |
1da177e4c Linux-2.6.12-rc2 |
1495 |
{ |
97735f25d [PATCH] hrtimer: ... |
1496 |
return posix_cpu_nsleep(PROCESS_CLOCK, flags, rqtp, rmtp); |
1da177e4c Linux-2.6.12-rc2 |
1497 |
} |
1711ef386 [PATCH] posix-tim... |
1498 1499 1500 1501 |
static long process_cpu_nsleep_restart(struct restart_block *restart_block) { return -EINVAL; } |
a924b04dd [PATCH] hrtimer: ... |
1502 1503 |
static int thread_cpu_clock_getres(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1504 1505 1506 |
{ return posix_cpu_clock_getres(THREAD_CLOCK, tp); } |
a924b04dd [PATCH] hrtimer: ... |
1507 1508 |
static int thread_cpu_clock_get(const clockid_t which_clock, struct timespec *tp) |
1da177e4c Linux-2.6.12-rc2 |
1509 1510 1511 1512 1513 1514 1515 1516 |
{ 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 |
1517 |
|
1976945ee posix-timers: Int... |
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 |
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 |
1529 1530 1531 |
static __init int init_posix_cpu_timers(void) { struct k_clock process = { |
2fd1f0408 posix-timers: Cle... |
1532 1533 |
.clock_getres = process_cpu_clock_getres, .clock_get = process_cpu_clock_get, |
2fd1f0408 posix-timers: Cle... |
1534 1535 1536 |
.timer_create = process_cpu_timer_create, .nsleep = process_cpu_nsleep, .nsleep_restart = process_cpu_nsleep_restart, |
1da177e4c Linux-2.6.12-rc2 |
1537 1538 |
}; struct k_clock thread = { |
2fd1f0408 posix-timers: Cle... |
1539 1540 |
.clock_getres = thread_cpu_clock_getres, .clock_get = thread_cpu_clock_get, |
2fd1f0408 posix-timers: Cle... |
1541 |
.timer_create = thread_cpu_timer_create, |
1da177e4c Linux-2.6.12-rc2 |
1542 |
}; |
8356b5f9c itimers: Fix peri... |
1543 |
struct timespec ts; |
1da177e4c Linux-2.6.12-rc2 |
1544 |
|
527087374 posix-timers: Cle... |
1545 1546 |
posix_timers_register_clock(CLOCK_PROCESS_CPUTIME_ID, &process); posix_timers_register_clock(CLOCK_THREAD_CPUTIME_ID, &thread); |
1da177e4c Linux-2.6.12-rc2 |
1547 |
|
a42548a18 cputime: Optimize... |
1548 |
cputime_to_timespec(cputime_one_jiffy, &ts); |
8356b5f9c itimers: Fix peri... |
1549 1550 |
onecputick = ts.tv_nsec; WARN_ON(ts.tv_sec != 0); |
1da177e4c Linux-2.6.12-rc2 |
1551 1552 1553 |
return 0; } __initcall(init_posix_cpu_timers); |