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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58329C77B75 for ; Tue, 9 May 2023 12:23:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235760AbjEIMXR (ORCPT ); Tue, 9 May 2023 08:23:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33312 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235728AbjEIMXG (ORCPT ); Tue, 9 May 2023 08:23:06 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 2E33944AA; Tue, 9 May 2023 05:23:05 -0700 (PDT) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 55A861576; Tue, 9 May 2023 05:23:49 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.22.29]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id E2B163F67D; Tue, 9 May 2023 05:23:01 -0700 (PDT) From: Lukasz Luba To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: rostedt@goodmis.org, mhiramat@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, delyank@fb.com, lukasz.luba@arm.com, qyousef@google.com, qyousef@layalina.io, kernel test robot Subject: [PATCH v2 3/3] schedutil: trace: Add tracing to capture filter out requests Date: Tue, 9 May 2023 13:22:46 +0100 Message-Id: <20230509122246.1702397-4-lukasz.luba@arm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230509122246.1702397-1-lukasz.luba@arm.com> References: <20230509122246.1702397-1-lukasz.luba@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some of the frequency update requests coming form the task scheduler might be filter out. It can happen when the previous request was served not that long ago (in a period smaller than provided by the cpufreq driver as minimum for frequency update). In such case, we want to know if some of the frequency updates cannot make through. Export the new tracepoint as well. That would allow to handle it by a toolkit for trace analyzes. Reported-by: kernel test robot # solved tricky build Signed-off-by: Lukasz Luba --- include/trace/events/sched.h | 4 ++++ kernel/sched/cpufreq_schedutil.c | 10 ++++++++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index dbfb30809f15..e34b7cd5de73 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -739,6 +739,10 @@ DECLARE_TRACE(uclamp_update_tsk_tp, TP_PROTO(struct task_struct *tsk, int uclamp_id, unsigned int value), TP_ARGS(tsk, uclamp_id, value)); +DECLARE_TRACE(schedutil_update_filtered_tp, + TP_PROTO(int cpu), + TP_ARGS(cpu)); + #endif /* _TRACE_SCHED_H */ /* This part must be outside protection */ diff --git a/kernel/sched/cpufreq_schedutil.c b/kernel/sched/cpufreq_schedutil.c index f462496e5c07..4f9daf258a65 100644 --- a/kernel/sched/cpufreq_schedutil.c +++ b/kernel/sched/cpufreq_schedutil.c @@ -6,6 +6,8 @@ * Author: Rafael J. Wysocki */ +EXPORT_TRACEPOINT_SYMBOL_GPL(schedutil_update_filtered_tp); + #define IOWAIT_BOOST_MIN (SCHED_CAPACITY_SCALE / 8) struct sugov_tunables { @@ -318,8 +320,10 @@ static inline bool sugov_update_single_common(struct sugov_cpu *sg_cpu, ignore_dl_rate_limit(sg_cpu); - if (!sugov_should_update_freq(sg_cpu->sg_policy, time)) + if (!sugov_should_update_freq(sg_cpu->sg_policy, time)) { + trace_schedutil_update_filtered_tp(sg_cpu->cpu); return false; + } sugov_get_util(sg_cpu); sugov_iowait_apply(sg_cpu, time, max_cap); @@ -446,8 +450,10 @@ sugov_update_shared(struct update_util_data *hook, u64 time, unsigned int flags) ignore_dl_rate_limit(sg_cpu); - if (!sugov_should_update_freq(sg_policy, time)) + if (!sugov_should_update_freq(sg_policy, time)) { + trace_schedutil_update_filtered_tp(sg_cpu->cpu); goto unlock; + } next_f = sugov_next_freq_shared(sg_cpu, time); -- 2.25.1