From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D13DDC3A59E for ; Wed, 21 Aug 2019 19:31:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEF6520679 for ; Wed, 21 Aug 2019 19:31:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730458AbfHUTbw (ORCPT ); Wed, 21 Aug 2019 15:31:52 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:57346 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730227AbfHUTbL (ORCPT ); Wed, 21 Aug 2019 15:31:11 -0400 Received: from localhost ([127.0.0.1] helo=nanos.tec.linutronix.de) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1i0WK4-0004GU-MX; Wed, 21 Aug 2019 21:31:08 +0200 Message-Id: <20190821192922.365469982@linutronix.de> User-Agent: quilt/0.65 Date: Wed, 21 Aug 2019 21:09:20 +0200 From: Thomas Gleixner To: LKML Cc: Oleg Nesterov , Ingo Molnar , Peter Zijlstra , John Stultz , Frederic Weisbecker , Anna-Maria Behnsen , Christoph Hellwig Subject: [patch V2 33/38] posix-cpu-timers: Consolidate timer expiry further References: <20190821190847.665673890@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org With the array based samples and expiry cache, the expiry function can use a loop to collect timers from the clock specific lists. Signed-off-by: Thomas Gleixner --- V2: Adopt to the per clock base struct --- kernel/time/posix-cpu-timers.c | 63 +++++++++++++++++++---------------------- 1 file changed, 30 insertions(+), 33 deletions(-) --- a/kernel/time/posix-cpu-timers.c +++ b/kernel/time/posix-cpu-timers.c @@ -752,6 +752,18 @@ check_timers_list(struct list_head *time return U64_MAX; } +static void collect_posix_cputimers(struct posix_cputimers *pct, + u64 *samples, struct list_head *firing) +{ + struct posix_cputimer_base *base = pct->bases; + int i; + + for (i = 0; i < CPUCLOCK_MAX; i++, base++) { + base->nextevt = check_timers_list(&base->cpu_timers, firing, + samples[i]); + } +} + static inline void check_dl_overrun(struct task_struct *tsk) { if (tsk->dl.dl_overrun) { @@ -768,25 +780,18 @@ static inline void check_dl_overrun(stru static void check_thread_timers(struct task_struct *tsk, struct list_head *firing) { - struct posix_cputimer_base *base = tsk->posix_cputimers.bases; + struct posix_cputimers *pct = &tsk->posix_cputimers; + u64 samples[CPUCLOCK_MAX]; unsigned long soft; - u64 stime, utime; if (dl_task(tsk)) check_dl_overrun(tsk); - if (expiry_cache_is_inactive(&tsk->posix_cputimers)) + if (expiry_cache_is_inactive(pct)) return; - task_cputime(tsk, &utime, &stime); - - 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); + task_sample_cputime(tsk, samples); + collect_posix_cputimers(pct, samples, firing); /* * Check for the special case thread timers. @@ -825,7 +830,7 @@ static void check_thread_timers(struct t } } - if (expiry_cache_is_inactive(&tsk->posix_cputimers)) + if (expiry_cache_is_inactive(pct)) tick_dep_clear_task(tsk, TICK_DEP_BIT_POSIX_TIMER); } @@ -869,15 +874,15 @@ static void check_process_timers(struct struct list_head *firing) { struct signal_struct *const sig = tsk->signal; - struct posix_cputimer_base *base = sig->posix_cputimers.bases; - u64 virt_exp, prof_exp, sched_exp, samples[CPUCLOCK_MAX]; + struct posix_cputimers *pct = &sig->posix_cputimers; + u64 samples[CPUCLOCK_MAX]; unsigned long soft; /* * If cputimer is not running, then there are no active * process wide timers (POSIX 1.b, itimers, RLIMIT_CPU). */ - if (!READ_ONCE(tsk->signal->cputimer.running)) + if (!READ_ONCE(sig->cputimer.running)) return; /* @@ -891,21 +896,17 @@ static void check_process_timers(struct * so the sample can be taken directly. */ proc_sample_cputime_atomic(&sig->cputimer.cputime_atomic, samples); - - prof_exp = check_timers_list(&base[CPUCLOCK_PROF].cpu_timers, - firing, samples[CPUCLOCK_PROF]); - virt_exp = check_timers_list(&base[CPUCLOCK_VIRT].cpu_timers, - firing, samples[CPUCLOCK_VIRT]); - sched_exp = check_timers_list(&base[CPUCLOCK_SCHED].cpu_timers, - firing, samples[CPUCLOCK_SCHED]); + collect_posix_cputimers(pct, samples, firing); /* * Check for the special case process timers. */ - check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], &prof_exp, + check_cpu_itimer(tsk, &sig->it[CPUCLOCK_PROF], + &pct->bases[CPUCLOCK_PROF].nextevt, samples[CPUCLOCK_PROF], SIGPROF); - check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], &virt_exp, - samples[CPUCLOCK_PROF], SIGVTALRM); + check_cpu_itimer(tsk, &sig->it[CPUCLOCK_VIRT], + &pct->bases[CPUCLOCK_VIRT].nextevt, + samples[CPUCLOCK_VIRT], SIGVTALRM); soft = task_rlimit(tsk, RLIMIT_CPU); if (soft != RLIM_INFINITY) { @@ -940,15 +941,11 @@ static void check_process_timers(struct } } softns = soft * NSEC_PER_SEC; - if (softns < prof_exp) - prof_exp = softns; + if (softns < pct->bases[CPUCLOCK_PROF].nextevt) + pct->bases[CPUCLOCK_PROF].nextevt = softns; } - base[CPUCLOCK_PROF].nextevt = prof_exp; - base[CPUCLOCK_VIRT].nextevt = virt_exp; - base[CPUCLOCK_SCHED].nextevt = sched_exp; - - if (expiry_cache_is_inactive(&sig->posix_cputimers)) + if (expiry_cache_is_inactive(pct)) stop_process_timers(sig); sig->cputimer.checking_timer = false;