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=-20.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 2C760C433EF for ; Thu, 16 Sep 2021 11:59:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0FF8F61354 for ; Thu, 16 Sep 2021 11:59:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238975AbhIPMBK (ORCPT ); Thu, 16 Sep 2021 08:01:10 -0400 Received: from Galois.linutronix.de ([193.142.43.55]:47546 "EHLO galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238768AbhIPMAw (ORCPT ); Thu, 16 Sep 2021 08:00:52 -0400 Date: Thu, 16 Sep 2021 11:59:30 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1631793571; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zXsQlsCrXE/SA1D57qWJMmiJ3URcFLTTxWCtR79vayg=; b=kZ7j8jXIF0MQmUsEWO10VnwrRIY+Jewz8va2wzJL4VJsJOLZgPhnvHw5qFEBngzkvwI+23 OACSPXefLea/AeEr5JL9zYJWT1aFtL/Vc33xtsBy9vMnf/sVXyNCS2LpF9iS67RoG4awh1 vga3x1Z/iOSRYu7cqPGrZG774OPnaQsNXMuBgwH/63WtYagFT8VuSSEFblEQLkSFP5WTZu NE3iX9EtB0dVNVZZO66bXewU8YhQUWKzcA2UJ43WX23Yj6b9bk9Ab8NcNMRtepXsDYUaJw Q047s1sSdUlgmcr1bmqnxQAWGQiIbx/FT+gJ73MOarQxlMBnxuAma1WIGS3D0Q== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1631793571; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zXsQlsCrXE/SA1D57qWJMmiJ3URcFLTTxWCtR79vayg=; b=1n7uh1ZxPcq2JyaObB9ZtGGcVxKtwJLEk81SsuyIFPWqhT9HoaqU7HHdbBLbh/6CIzUULE WT3PziNeAeROvyCw== From: "tip-bot2 for Yafang Shao" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched: Make schedstats helpers independent of fair sched class Cc: Yafang Shao , "Peter Zijlstra (Intel)" , Mel Gorman , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20210905143547.4668-4-laoar.shao@gmail.com> References: <20210905143547.4668-4-laoar.shao@gmail.com> MIME-Version: 1.0 Message-ID: <163179357021.25758.10981779014395186541.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: a05296a6e2914899bc6492de92579a7ed771b7e8 Gitweb: https://git.kernel.org/tip/a05296a6e2914899bc6492de92579a7ed771b7e8 Author: Yafang Shao AuthorDate: Sun, 05 Sep 2021 14:35:42 Committer: Peter Zijlstra CommitterDate: Wed, 15 Sep 2021 17:48:59 +02:00 sched: Make schedstats helpers independent of fair sched class The original prototype of the schedstats helpers are update_stats_wait_*(struct cfs_rq *cfs_rq, struct sched_entity *se) The cfs_rq in these helpers is used to get the rq_clock, and the se is used to get the struct sched_statistics and the struct task_struct. In order to make these helpers available by all sched classes, we can pass the rq, sched_statistics and task_struct directly. Then the new helpers are update_stats_wait_*(struct rq *rq, struct task_struct *p, struct sched_statistics *stats) which are independent of fair sched class. To avoid vmlinux growing too large or introducing ovehead when !schedstat_enabled(), some new helpers after schedstat_enabled() are also introduced, Suggested by Mel. These helpers are in sched/stats.c, __update_stats_wait_*(struct rq *rq, struct task_struct *p, struct sched_statistics *stats) The size of vmlinux as follows, Before After Size of vmlinux 826308552 826304640 The size is a litte smaller as some functions are not inlined again after the change. I also compared the sched performance with 'perf bench sched pipe', suggested by Mel. The result as followsi (in usecs/op), Before After kernel.sched_schedstats=0 5.2~5.4 5.2~5.4 kernel.sched_schedstats=1 5.3~5.5 5.3~5.5 [These data is a little difference with the prev version, that is because my old test machine is destroyed so I have to use a new different test machine.] Almost no difference. No functional change. [lkp@intel.com: reported build failure in prev version] Signed-off-by: Yafang Shao Signed-off-by: Peter Zijlstra (Intel) Acked-by: Mel Gorman Link: https://lore.kernel.org/r/20210905143547.4668-4-laoar.shao@gmail.com --- kernel/sched/fair.c | 134 +++++------------------------------------- kernel/sched/stats.c | 103 ++++++++++++++++++++++++++++++++- kernel/sched/stats.h | 30 +++++++++- 3 files changed, 152 insertions(+), 115 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 500e960..e26d622 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -887,32 +887,27 @@ static void update_curr_fair(struct rq *rq) } static inline void -update_stats_wait_start(struct cfs_rq *cfs_rq, struct sched_entity *se) +update_stats_wait_start_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) { - u64 wait_start, prev_wait_start; struct sched_statistics *stats; + struct task_struct *p = NULL; if (!schedstat_enabled()) return; stats = __schedstats_from_se(se); - wait_start = rq_clock(rq_of(cfs_rq)); - prev_wait_start = schedstat_val(stats->wait_start); - - if (entity_is_task(se) && task_on_rq_migrating(task_of(se)) && - likely(wait_start > prev_wait_start)) - wait_start -= prev_wait_start; + if (entity_is_task(se)) + p = task_of(se); - __schedstat_set(stats->wait_start, wait_start); + __update_stats_wait_start(rq_of(cfs_rq), p, stats); } static inline void -update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) +update_stats_wait_end_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) { struct sched_statistics *stats; struct task_struct *p = NULL; - u64 delta; if (!schedstat_enabled()) return; @@ -928,105 +923,34 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) if (unlikely(!schedstat_val(stats->wait_start))) return; - delta = rq_clock(rq_of(cfs_rq)) - schedstat_val(stats->wait_start); - - if (entity_is_task(se)) { + if (entity_is_task(se)) p = task_of(se); - if (task_on_rq_migrating(p)) { - /* - * Preserve migrating task's wait time so wait_start - * time stamp can be adjusted to accumulate wait time - * prior to migration. - */ - __schedstat_set(stats->wait_start, delta); - return; - } - trace_sched_stat_wait(p, delta); - } - __schedstat_set(stats->wait_max, - max(schedstat_val(stats->wait_max), delta)); - __schedstat_inc(stats->wait_count); - __schedstat_add(stats->wait_sum, delta); - __schedstat_set(stats->wait_start, 0); + __update_stats_wait_end(rq_of(cfs_rq), p, stats); } static inline void -update_stats_enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) +update_stats_enqueue_sleeper_fair(struct cfs_rq *cfs_rq, struct sched_entity *se) { struct sched_statistics *stats; struct task_struct *tsk = NULL; - u64 sleep_start, block_start; if (!schedstat_enabled()) return; stats = __schedstats_from_se(se); - sleep_start = schedstat_val(stats->sleep_start); - block_start = schedstat_val(stats->block_start); - if (entity_is_task(se)) tsk = task_of(se); - if (sleep_start) { - u64 delta = rq_clock(rq_of(cfs_rq)) - sleep_start; - - if ((s64)delta < 0) - delta = 0; - - if (unlikely(delta > schedstat_val(stats->sleep_max))) - __schedstat_set(stats->sleep_max, delta); - - __schedstat_set(stats->sleep_start, 0); - __schedstat_add(stats->sum_sleep_runtime, delta); - - if (tsk) { - account_scheduler_latency(tsk, delta >> 10, 1); - trace_sched_stat_sleep(tsk, delta); - } - } - if (block_start) { - u64 delta = rq_clock(rq_of(cfs_rq)) - block_start; - - if ((s64)delta < 0) - delta = 0; - - if (unlikely(delta > schedstat_val(stats->block_max))) - __schedstat_set(stats->block_max, delta); - - __schedstat_set(stats->block_start, 0); - __schedstat_add(stats->sum_sleep_runtime, delta); - - if (tsk) { - if (tsk->in_iowait) { - __schedstat_add(stats->iowait_sum, delta); - __schedstat_inc(stats->iowait_count); - trace_sched_stat_iowait(tsk, delta); - } - - trace_sched_stat_blocked(tsk, delta); - - /* - * Blocking time is in units of nanosecs, so shift by - * 20 to get a milliseconds-range estimation of the - * amount of time that the task spent sleeping: - */ - if (unlikely(prof_on == SLEEP_PROFILING)) { - profile_hits(SLEEP_PROFILING, - (void *)get_wchan(tsk), - delta >> 20); - } - account_scheduler_latency(tsk, delta >> 10, 0); - } - } + __update_stats_enqueue_sleeper(rq_of(cfs_rq), tsk, stats); } /* * Task is being enqueued - update stats: */ static inline void -update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) +update_stats_enqueue_fair(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) { if (!schedstat_enabled()) return; @@ -1036,14 +960,14 @@ update_stats_enqueue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) * a dequeue/enqueue event is a NOP) */ if (se != cfs_rq->curr) - update_stats_wait_start(cfs_rq, se); + update_stats_wait_start_fair(cfs_rq, se); if (flags & ENQUEUE_WAKEUP) - update_stats_enqueue_sleeper(cfs_rq, se); + update_stats_enqueue_sleeper_fair(cfs_rq, se); } static inline void -update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) +update_stats_dequeue_fair(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) { if (!schedstat_enabled()) @@ -1054,7 +978,7 @@ update_stats_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) * waiting task: */ if (se != cfs_rq->curr) - update_stats_wait_end(cfs_rq, se); + update_stats_wait_end_fair(cfs_rq, se); if ((flags & DEQUEUE_SLEEP) && entity_is_task(se)) { struct task_struct *tsk = task_of(se); @@ -4238,26 +4162,6 @@ place_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int initial) static void check_enqueue_throttle(struct cfs_rq *cfs_rq); -static inline void check_schedstat_required(void) -{ -#ifdef CONFIG_SCHEDSTATS - if (schedstat_enabled()) - return; - - /* Force schedstat enabled if a dependent tracepoint is active */ - if (trace_sched_stat_wait_enabled() || - trace_sched_stat_sleep_enabled() || - trace_sched_stat_iowait_enabled() || - trace_sched_stat_blocked_enabled() || - trace_sched_stat_runtime_enabled()) { - printk_deferred_once("Scheduler tracepoints stat_sleep, stat_iowait, " - "stat_blocked and stat_runtime require the " - "kernel parameter schedstats=enable or " - "kernel.sched_schedstats=1\n"); - } -#endif -} - static inline bool cfs_bandwidth_used(void); /* @@ -4331,7 +4235,7 @@ enqueue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) place_entity(cfs_rq, se, 0); check_schedstat_required(); - update_stats_enqueue(cfs_rq, se, flags); + update_stats_enqueue_fair(cfs_rq, se, flags); check_spread(cfs_rq, se); if (!curr) __enqueue_entity(cfs_rq, se); @@ -4415,7 +4319,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, struct sched_entity *se, int flags) update_load_avg(cfs_rq, se, UPDATE_TG); se_update_runnable(se); - update_stats_dequeue(cfs_rq, se, flags); + update_stats_dequeue_fair(cfs_rq, se, flags); clear_buddies(cfs_rq, se); @@ -4500,7 +4404,7 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) * a CPU. So account for the time it spent waiting on the * runqueue. */ - update_stats_wait_end(cfs_rq, se); + update_stats_wait_end_fair(cfs_rq, se); __dequeue_entity(cfs_rq, se); update_load_avg(cfs_rq, se, UPDATE_TG); } @@ -4602,7 +4506,7 @@ static void put_prev_entity(struct cfs_rq *cfs_rq, struct sched_entity *prev) check_spread(cfs_rq, prev); if (prev->on_rq) { - update_stats_wait_start(cfs_rq, prev); + update_stats_wait_start_fair(cfs_rq, prev); /* Put 'current' back into the tree. */ __enqueue_entity(cfs_rq, prev); /* in !on_rq case, update occurred at dequeue */ diff --git a/kernel/sched/stats.c b/kernel/sched/stats.c index 3f93fc3..fad781c 100644 --- a/kernel/sched/stats.c +++ b/kernel/sched/stats.c @@ -4,6 +4,109 @@ */ #include "sched.h" +void __update_stats_wait_start(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats) +{ + u64 wait_start, prev_wait_start; + + wait_start = rq_clock(rq); + prev_wait_start = schedstat_val(stats->wait_start); + + if (p && likely(wait_start > prev_wait_start)) + wait_start -= prev_wait_start; + + __schedstat_set(stats->wait_start, wait_start); +} + +void __update_stats_wait_end(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats) +{ + u64 delta = rq_clock(rq) - schedstat_val(stats->wait_start); + + if (p) { + if (task_on_rq_migrating(p)) { + /* + * Preserve migrating task's wait time so wait_start + * time stamp can be adjusted to accumulate wait time + * prior to migration. + */ + __schedstat_set(stats->wait_start, delta); + + return; + } + + trace_sched_stat_wait(p, delta); + } + + __schedstat_set(stats->wait_max, + max(schedstat_val(stats->wait_max), delta)); + __schedstat_inc(stats->wait_count); + __schedstat_add(stats->wait_sum, delta); + __schedstat_set(stats->wait_start, 0); +} + +void __update_stats_enqueue_sleeper(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats) +{ + u64 sleep_start, block_start; + + sleep_start = schedstat_val(stats->sleep_start); + block_start = schedstat_val(stats->block_start); + + if (sleep_start) { + u64 delta = rq_clock(rq) - sleep_start; + + if ((s64)delta < 0) + delta = 0; + + if (unlikely(delta > schedstat_val(stats->sleep_max))) + __schedstat_set(stats->sleep_max, delta); + + __schedstat_set(stats->sleep_start, 0); + __schedstat_add(stats->sum_sleep_runtime, delta); + + if (p) { + account_scheduler_latency(p, delta >> 10, 1); + trace_sched_stat_sleep(p, delta); + } + } + + if (block_start) { + u64 delta = rq_clock(rq) - block_start; + + if ((s64)delta < 0) + delta = 0; + + if (unlikely(delta > schedstat_val(stats->block_max))) + __schedstat_set(stats->block_max, delta); + + __schedstat_set(stats->block_start, 0); + __schedstat_add(stats->sum_sleep_runtime, delta); + + if (p) { + if (p->in_iowait) { + __schedstat_add(stats->iowait_sum, delta); + __schedstat_inc(stats->iowait_count); + trace_sched_stat_iowait(p, delta); + } + + trace_sched_stat_blocked(p, delta); + + /* + * Blocking time is in units of nanosecs, so shift by + * 20 to get a milliseconds-range estimation of the + * amount of time that the task spent sleeping: + */ + if (unlikely(prof_on == SLEEP_PROFILING)) { + profile_hits(SLEEP_PROFILING, + (void *)get_wchan(p), + delta >> 20); + } + account_scheduler_latency(p, delta >> 10, 0); + } + } +} + /* * Current schedstat API version. * diff --git a/kernel/sched/stats.h b/kernel/sched/stats.h index fb6022e..cfb0893 100644 --- a/kernel/sched/stats.h +++ b/kernel/sched/stats.h @@ -2,6 +2,8 @@ #ifdef CONFIG_SCHEDSTATS +extern struct static_key_false sched_schedstats; + /* * Expects runqueue lock to be held for atomicity of update */ @@ -40,6 +42,29 @@ rq_sched_info_dequeue(struct rq *rq, unsigned long long delta) #define schedstat_val(var) (var) #define schedstat_val_or_zero(var) ((schedstat_enabled()) ? (var) : 0) +void __update_stats_wait_start(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats); + +void __update_stats_wait_end(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats); +void __update_stats_enqueue_sleeper(struct rq *rq, struct task_struct *p, + struct sched_statistics *stats); + +static inline void +check_schedstat_required(void) +{ + if (schedstat_enabled()) + return; + + /* Force schedstat enabled if a dependent tracepoint is active */ + if (trace_sched_stat_wait_enabled() || + trace_sched_stat_sleep_enabled() || + trace_sched_stat_iowait_enabled() || + trace_sched_stat_blocked_enabled() || + trace_sched_stat_runtime_enabled()) + printk_deferred_once("Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enable or kernel.sched_schedstats=1\n"); +} + #else /* !CONFIG_SCHEDSTATS: */ static inline void rq_sched_info_arrive (struct rq *rq, unsigned long long delta) { } @@ -55,6 +80,11 @@ static inline void rq_sched_info_depart (struct rq *rq, unsigned long long delt # define schedstat_val(var) 0 # define schedstat_val_or_zero(var) 0 +# define __update_stats_wait_start(rq, p, stats) do { } while (0) +# define __update_stats_wait_end(rq, p, stats) do { } while (0) +# define __update_stats_enqueue_sleeper(rq, p, stats) do { } while (0) +# define check_schedstat_required() do { } while (0) + #endif /* CONFIG_SCHEDSTATS */ #ifdef CONFIG_FAIR_GROUP_SCHED