From patchwork Wed Mar 22 15:18:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Luba X-Patchwork-Id: 13184236 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 0750CC6FD1F for ; Wed, 22 Mar 2023 15:20:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231561AbjCVPUR (ORCPT ); Wed, 22 Mar 2023 11:20:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57098 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231538AbjCVPUP (ORCPT ); Wed, 22 Mar 2023 11:20:15 -0400 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id AA838591E0; Wed, 22 Mar 2023 08:20:14 -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 755B4AD7; Wed, 22 Mar 2023 08:20:58 -0700 (PDT) Received: from e123648.arm.com (unknown [10.57.18.173]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id C8DC73F71E; Wed, 22 Mar 2023 08:20:11 -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 Subject: [PATCH 1/3] sched/tp: Add new tracepoint to track uclamp set from user-space Date: Wed, 22 Mar 2023 15:18:41 +0000 Message-Id: <20230322151843.14390-2-lukasz.luba@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230322151843.14390-1-lukasz.luba@arm.com> References: <20230322151843.14390-1-lukasz.luba@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-trace-kernel@vger.kernel.org The user-space can set uclamp value for a given task. It impacts task placement decisions made by the scheduler. This is very useful information and helps to understand the system behavior or track improvements in middleware and applications which start using uclamp mechanisms and report better performance in tests. Signed-off-by: Lukasz Luba --- include/trace/events/sched.h | 4 ++++ kernel/sched/core.c | 5 +++++ 2 files changed, 9 insertions(+) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index fbb99a61f714..dbfb30809f15 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -735,6 +735,10 @@ DECLARE_TRACE(sched_update_nr_running_tp, TP_PROTO(struct rq *rq, int change), TP_ARGS(rq, change)); +DECLARE_TRACE(uclamp_update_tsk_tp, + TP_PROTO(struct task_struct *tsk, int uclamp_id, unsigned int value), + TP_ARGS(tsk, uclamp_id, value)); + #endif /* _TRACE_SCHED_H */ /* This part must be outside protection */ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 488655f2319f..882c92e3ccf0 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -110,6 +110,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_overutilized_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_cfs_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_util_est_se_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(uclamp_update_tsk_tp); DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); @@ -1936,12 +1937,16 @@ static void __setscheduler_uclamp(struct task_struct *p, attr->sched_util_min != -1) { uclamp_se_set(&p->uclamp_req[UCLAMP_MIN], attr->sched_util_min, true); + trace_uclamp_update_tsk_tp(p, UCLAMP_MIN, + attr->sched_util_min); } if (attr->sched_flags & SCHED_FLAG_UTIL_CLAMP_MAX && attr->sched_util_max != -1) { uclamp_se_set(&p->uclamp_req[UCLAMP_MAX], attr->sched_util_max, true); + trace_uclamp_update_tsk_tp(p, UCLAMP_MAX, + attr->sched_util_max); } }