From e80eda94d3eaf1d12cfc97878eff77cd679dabc9 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 23 Oct 2005 10:02:50 -0700 Subject: [PATCH] Posix timers: limit number of timers firing at once Bursty timers aren't good for anybody, very much including latency for other programs when we trigger lots of timers in interrupt context. So set a random limit, after which we'll handle the rest on the next timer tick. Noted by Oleg Nesterov Signed-off-by: Linus Torvalds --- kernel/posix-cpu-timers.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index 7a51a5597c33..d30b304a3384 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -961,14 +961,16 @@ void posix_cpu_timer_get(struct k_itimer *timer, struct itimerspec *itp) static void check_thread_timers(struct task_struct *tsk, struct list_head *firing) { + int maxfire; struct list_head *timers = tsk->cpu_timers; + maxfire = 20; tsk->it_prof_expires = cputime_zero; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (cputime_lt(prof_ticks(tsk), t->expires.cpu)) { + if (!--maxfire || cputime_lt(prof_ticks(tsk), t->expires.cpu)) { tsk->it_prof_expires = t->expires.cpu; break; } @@ -977,12 +979,13 @@ static void check_thread_timers(struct task_struct *tsk, } ++timers; + maxfire = 20; tsk->it_virt_expires = cputime_zero; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (cputime_lt(virt_ticks(tsk), t->expires.cpu)) { + if (!--maxfire || cputime_lt(virt_ticks(tsk), t->expires.cpu)) { tsk->it_virt_expires = t->expires.cpu; break; } @@ -991,12 +994,13 @@ static void check_thread_timers(struct task_struct *tsk, } ++timers; + maxfire = 20; tsk->it_sched_expires = 0; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (tsk->sched_time < t->expires.sched) { + if (!--maxfire || tsk->sched_time < t->expires.sched) { tsk->it_sched_expires = t->expires.sched; break; } @@ -1013,6 +1017,7 @@ static void check_thread_timers(struct task_struct *tsk, static void check_process_timers(struct task_struct *tsk, struct list_head *firing) { + int maxfire; struct signal_struct *const sig = tsk->signal; cputime_t utime, stime, ptime, virt_expires, prof_expires; unsigned long long sched_time, sched_expires; @@ -1045,12 +1050,13 @@ static void check_process_timers(struct task_struct *tsk, } while (t != tsk); ptime = cputime_add(utime, stime); + maxfire = 20; prof_expires = cputime_zero; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (cputime_lt(ptime, t->expires.cpu)) { + if (!--maxfire || cputime_lt(ptime, t->expires.cpu)) { prof_expires = t->expires.cpu; break; } @@ -1059,12 +1065,13 @@ static void check_process_timers(struct task_struct *tsk, } ++timers; + maxfire = 20; virt_expires = cputime_zero; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (cputime_lt(utime, t->expires.cpu)) { + if (!--maxfire || cputime_lt(utime, t->expires.cpu)) { virt_expires = t->expires.cpu; break; } @@ -1073,12 +1080,13 @@ static void check_process_timers(struct task_struct *tsk, } ++timers; + maxfire = 20; sched_expires = 0; while (!list_empty(timers)) { struct cpu_timer_list *t = list_entry(timers->next, struct cpu_timer_list, entry); - if (sched_time < t->expires.sched) { + if (!--maxfire || sched_time < t->expires.sched) { sched_expires = t->expires.sched; break; } -- 2.20.1