diff options
Diffstat (limited to 'kernel/time')
-rw-r--r-- | kernel/time/posix-cpu-timers.c | 105 |
1 files changed, 56 insertions, 49 deletions
diff --git a/kernel/time/posix-cpu-timers.c b/kernel/time/posix-cpu-timers.c index ffd49181e23d..9ac601abc4c4 100644 --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -24,13 +24,13 @@ void posix_cputimers_group_init(struct posix_cputimers *pct, u64 cpu_limit) { posix_cputimers_init(pct); if (cpu_limit != RLIM_INFINITY) - pct->expiries[CPUCLOCK_PROF] = cpu_limit * NSEC_PER_SEC; + pct->bases[CPUCLOCK_PROF].nextevt = cpu_limit * NSEC_PER_SEC; } /* * Called after updating RLIMIT_CPU to run cpu timer and update - * tsk->signal->posix_cputimers.expiries expiration cache if - * necessary. Needs siglock protection since other code may update + * tsk->signal->posix_cputimers.bases[clock].nextevt expiration cache if + * necessary. Needs siglock protection since other code may update the * expiration cache as well. */ void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new) @@ -122,9 +122,11 @@ static void bump_cpu_timer(struct k_itimer *timer, u64 now) } } -static inline bool expiry_cache_is_zero(const u64 *ec) +static inline bool expiry_cache_is_zero(const struct posix_cputimers *pct) { - return !(ec[CPUCLOCK_PROF] | ec[CPUCLOCK_VIRT] | ec[CPUCLOCK_SCHED]); + return !(pct->bases[CPUCLOCK_PROF].nextevt | + pct->bases[CPUCLOCK_VIRT].nextevt | + pct->bases[CPUCLOCK_SCHED].nextevt); } static int @@ -432,9 +434,9 @@ static void cleanup_timers_list(struct list_head *head) */ static void cleanup_timers(struct posix_cputimers *pct) { - cleanup_timers_list(&pct->cpu_timers[CPUCLOCK_PROF]); - cleanup_timers_list(&pct->cpu_timers[CPUCLOCK_VIRT]); - cleanup_timers_list(&pct->cpu_timers[CPUCLOCK_SCHED]); + cleanup_timers_list(&pct->bases[CPUCLOCK_PROF].cpu_timers); + cleanup_timers_list(&pct->bases[CPUCLOCK_VIRT].cpu_timers); + cleanup_timers_list(&pct->bases[CPUCLOCK_SCHED].cpu_timers); } /* @@ -464,21 +466,19 @@ static void arm_timer(struct k_itimer *timer) { struct cpu_timer_list *const nt = &timer->it.cpu; int clkidx = CPUCLOCK_WHICH(timer->it_clock); - u64 *cpuexp, newexp = timer->it.cpu.expires; struct task_struct *p = timer->it.cpu.task; + u64 newexp = timer->it.cpu.expires; + struct posix_cputimer_base *base; struct list_head *head, *listpos; struct cpu_timer_list *next; - if (CPUCLOCK_PERTHREAD(timer->it_clock)) { - head = p->posix_cputimers.cpu_timers + clkidx; - cpuexp = p->posix_cputimers.expiries + clkidx; - } else { - head = p->signal->posix_cputimers.cpu_timers + clkidx; - cpuexp = p->signal->posix_cputimers.expiries + clkidx; - } + if (CPUCLOCK_PERTHREAD(timer->it_clock)) + base = p->posix_cputimers.bases + clkidx; + else + base = p->signal->posix_cputimers.bases + clkidx; - listpos = head; - list_for_each_entry(next, head, entry) { + listpos = head = &base->cpu_timers; + list_for_each_entry(next,head, entry) { if (nt->expires < next->expires) break; listpos = &next->entry; @@ -494,8 +494,8 @@ static void arm_timer(struct k_itimer *timer) * for process timers we share expiration cache with itimers * and RLIMIT_CPU and for thread timers with RLIMIT_RTTIME. */ - if (expires_gt(*cpuexp, newexp)) - *cpuexp = newexp; + if (expires_gt(base->nextevt, newexp)) + base->nextevt = newexp; if (CPUCLOCK_PERTHREAD(timer->it_clock)) tick_dep_set_task(p, TICK_DEP_BIT_POSIX_TIMER); @@ -783,9 +783,9 @@ static inline void check_dl_overrun(struct task_struct *tsk) static void check_thread_timers(struct task_struct *tsk, struct list_head *firing) { - struct list_head *timers = tsk->posix_cputimers.cpu_timers; - u64 stime, utime, *expires = tsk->posix_cputimers.expiries; + struct posix_cputimer_base *base = tsk->posix_cputimers.bases; unsigned long soft; + u64 stime, utime; if (dl_task(tsk)) check_dl_overrun(tsk); @@ -794,14 +794,18 @@ static void check_thread_timers(struct task_struct *tsk, * If the expiry cache is zero, then there are no active per thread * CPU timers. */ - if (expiry_cache_is_zero(tsk->posix_cputimers.expiries)) + if (expiry_cache_is_zero(&tsk->posix_cputimers)) return; task_cputime(tsk, &utime, &stime); - *expires++ = check_timers_list(timers, firing, utime + stime); - *expires++ = check_timers_list(++timers, firing, utime); - *expires = check_timers_list(++timers, firing, tsk->se.sum_exec_runtime); + base->nextevt = check_timers_list(&base->cpu_timers, firing, + utime + stime); + base++; + base->nextevt = check_timers_list(&base->cpu_timers, firing, utime); + base++; + base->nextevt = check_timers_list(&base->cpu_timers, firing, + tsk->se.sum_exec_runtime); /* * Check for the special case thread timers. @@ -840,7 +844,7 @@ static void check_thread_timers(struct task_struct *tsk, } } - if (expiry_cache_is_zero(tsk->posix_cputimers.expiries)) + if (expiry_cache_is_zero(&tsk->posix_cputimers)) tick_dep_clear_task(tsk, TICK_DEP_BIT_POSIX_TIMER); } @@ -884,7 +888,7 @@ static void check_process_timers(struct task_struct *tsk, struct list_head *firing) { struct signal_struct *const sig = tsk->signal; - struct list_head *timers = sig->posix_cputimers.cpu_timers; + struct posix_cputimer_base *base = sig->posix_cputimers.bases; u64 utime, ptime, virt_expires, prof_expires; u64 sum_sched_runtime, sched_expires; struct task_cputime cputime; @@ -912,9 +916,12 @@ static void check_process_timers(struct task_struct *tsk, ptime = utime + cputime.stime; sum_sched_runtime = cputime.sum_exec_runtime; - prof_expires = check_timers_list(timers, firing, ptime); - virt_expires = check_timers_list(++timers, firing, utime); - sched_expires = check_timers_list(++timers, firing, sum_sched_runtime); + prof_expires = check_timers_list(&base[CPUCLOCK_PROF].cpu_timers, + firing, ptime); + virt_expires = check_timers_list(&base[CPUCLOCK_VIRT].cpu_timers, + firing, utime); + sched_expires = check_timers_list(&base[CPUCLOCK_SCHED].cpu_timers, + firing, sum_sched_runtime); /* * Check for the special case process timers. @@ -959,11 +966,11 @@ static void check_process_timers(struct task_struct *tsk, prof_expires = x; } - sig->posix_cputimers.expiries[CPUCLOCK_PROF] = prof_expires; - sig->posix_cputimers.expiries[CPUCLOCK_VIRT] = virt_expires; - sig->posix_cputimers.expiries[CPUCLOCK_SCHED] = sched_expires; + base[CPUCLOCK_PROF].nextevt = prof_expires; + base[CPUCLOCK_VIRT].nextevt = virt_expires; + base[CPUCLOCK_SCHED].nextevt = sched_expires; - if (expiry_cache_is_zero(sig->posix_cputimers.expiries)) + if (expiry_cache_is_zero(&sig->posix_cputimers)) stop_process_timers(sig); sig->cputimer.checking_timer = false; @@ -1028,20 +1035,21 @@ unlock: } /** - * task_cputimers_expired - Compare two task_cputime entities. + * task_cputimers_expired - Check whether posix CPU timers are expired * * @samples: Array of current samples for the CPUCLOCK clocks - * @expiries: Array of expiry values for the CPUCLOCK clocks + * @pct: Pointer to a posix_cputimers container * - * Returns true if any mmember of @samples is greater than the corresponding - * member of @expiries if that member is non zero. False otherwise + * Returns true if any member of @samples is greater than the corresponding + * member of @pct->bases[CLK].nextevt. False otherwise */ -static inline bool task_cputimers_expired(const u64 *sample, const u64 *expiries) +static inline bool +task_cputimers_expired(const u64 *sample, struct posix_cputimers *pct) { int i; for (i = 0; i < CPUCLOCK_MAX; i++) { - if (expiries[i] && sample[i] >= expiries[i]) + if (pct->bases[i].nextevt && sample[i] >= pct->bases[i].nextevt) return true; } return false; @@ -1059,14 +1067,13 @@ static inline bool task_cputimers_expired(const u64 *sample, const u64 *expiries */ static inline bool fastpath_timer_check(struct task_struct *tsk) { - u64 *expiries = tsk->posix_cputimers.expiries; struct signal_struct *sig; - if (!expiry_cache_is_zero(expiries)) { + if (!expiry_cache_is_zero(&tsk->posix_cputimers)) { u64 samples[CPUCLOCK_MAX]; task_sample_cputime(tsk, samples); - if (task_cputimers_expired(samples, expiries)) + if (task_cputimers_expired(samples, &tsk->posix_cputimers)) return true; } @@ -1092,8 +1099,7 @@ static inline bool fastpath_timer_check(struct task_struct *tsk) proc_sample_cputime_atomic(&sig->cputimer.cputime_atomic, samples); - if (task_cputimers_expired(samples, - sig->posix_cputimers.expiries)) + if (task_cputimers_expired(samples, &sig->posix_cputimers)) return true; } @@ -1176,11 +1182,12 @@ void run_posix_cpu_timers(void) void set_process_cpu_timer(struct task_struct *tsk, unsigned int clkid, u64 *newval, u64 *oldval) { - u64 now, *expiry = tsk->signal->posix_cputimers.expiries + clkid; + u64 now, *nextevt; if (WARN_ON_ONCE(clkid >= CPUCLOCK_SCHED)) return; + nextevt = &tsk->signal->posix_cputimers.bases[clkid].nextevt; now = cpu_clock_sample_group(clkid, tsk, true); if (oldval) { @@ -1207,8 +1214,8 @@ void set_process_cpu_timer(struct task_struct *tsk, unsigned int clkid, * Update expiration cache if this is the earliest timer. CPUCLOCK_PROF * expiry cache is also used by RLIMIT_CPU!. */ - if (expires_gt(*expiry, *newval)) - *expiry = *newval; + if (expires_gt(*nextevt, *newval)) + *nextevt = *newval; tick_dep_set_signal(tsk->signal, TICK_DEP_BIT_POSIX_TIMER); } |