From nobody Fri Dec 19 08:53:29 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A90831327F for ; Fri, 5 Dec 2025 13:17:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764940668; cv=none; b=Bs0AGWzhnUlUdNmMf1M1O1CGk2WnYKkVVr/44EJv7OEHbeXfXaUqJDbLzcn49RXYqKOwCx3y12Wf/UIpFfnwiCjYcxAuvvckpzBWctkkXem69kWnOdka0HkDqeGLfbDrr03l4zn9OxB1sc+ZSnbtUJIBvCQ33YEwtoH3h09CbCY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764940668; c=relaxed/simple; bh=qyVVzKDuMAKpPvfsvjIAbJrM0jyXjXukEt2k97VSu34=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CCPnO/tYH5jhDXO/CasSQG8K1k11D+pFXPvxI7SfCeNma5hmy+AyKmR+LyEZSejtQipOeKOx1TGcWUMebAvBb8sZRbjZ4o2YQFGoIQHF0tQ6b+vw2gRQqmK+P9qb/8PEyJPHThi5HV+sEWO3A0ihLXGWy8uiELPaJaJ8guO3Yuo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=Z2wfN4R/; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="Z2wfN4R/" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1764940657; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=HlhulN7DQPy6mdgynlshgNmSXZVBLh8VXkAgCCcFeJA=; b=Z2wfN4R/hURwCnX09lqvHtsDqhctw1OHWPkdBWxEgIju4YMFWfiQcARqyugkmqXu6HtYcM NwHT6s+Eaaaum0cjFyB6RqOAFoyjZxkHyo4YaXger7wnpFAfrrDp/4Fx8dWxhZGEDClONI VSjd49/gbYhb0ZezMdf6/f0zJXEZcsI= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-630-p-Dk8quHO3uqm0PNPWExmg-1; Fri, 05 Dec 2025 08:17:34 -0500 X-MC-Unique: p-Dk8quHO3uqm0PNPWExmg-1 X-Mimecast-MFC-AGG-ID: p-Dk8quHO3uqm0PNPWExmg_1764940652 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1E8D5195608D; Fri, 5 Dec 2025 13:17:32 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.rmtit.csb (unknown [10.45.226.23]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id EE966180044F; Fri, 5 Dec 2025 13:17:26 +0000 (UTC) From: Gabriele Monaco To: linux-kernel@vger.kernel.org, Steven Rostedt , Nam Cao , Masami Hiramatsu , Ingo Molnar , Peter Zijlstra , linux-trace-kernel@vger.kernel.org Cc: Gabriele Monaco , Tomas Glozar , Juri Lelli , Clark Williams , John Kacur Subject: [PATCH v3 09/13] sched: Add deadline tracepoints Date: Fri, 5 Dec 2025 14:16:17 +0100 Message-ID: <20251205131621.135513-10-gmonaco@redhat.com> In-Reply-To: <20251205131621.135513-1-gmonaco@redhat.com> References: <20251205131621.135513-1-gmonaco@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" Add the following tracepoints: * sched_dl_throttle(dl_se, cpu): Called when a deadline entity is throttled * sched_dl_replenish(dl_se, cpu): Called when a deadline entity's runtime is replenished * sched_dl_server_start(dl_se, cpu): Called when a deadline server is started * sched_dl_server_stop(dl_se, cpu): Called when a deadline server is stopped Those tracepoints can be useful to validate the deadline scheduler with RV and are not exported to tracefs. Signed-off-by: Gabriele Monaco Reviewed-by: Phil Auld --- Notes: V3: * Rename dl argument to dl_se in tracepoints include/trace/events/sched.h | 16 ++++++++++++++++ kernel/sched/core.c | 4 ++++ kernel/sched/deadline.c | 7 +++++++ 3 files changed, 27 insertions(+) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 7b2645b50e78..366b2e8ec40c 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -896,6 +896,22 @@ DECLARE_TRACE(sched_set_need_resched, TP_PROTO(struct task_struct *tsk, int cpu, int tif), TP_ARGS(tsk, cpu, tif)); =20 +DECLARE_TRACE(sched_dl_throttle, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu), + TP_ARGS(dl_se, cpu)); + +DECLARE_TRACE(sched_dl_replenish, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu), + TP_ARGS(dl_se, cpu)); + +DECLARE_TRACE(sched_dl_server_start, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu), + TP_ARGS(dl_se, cpu)); + +DECLARE_TRACE(sched_dl_server_stop, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu), + TP_ARGS(dl_se, cpu)); + #endif /* _TRACE_SCHED_H */ =20 /* This part must be outside protection */ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 5516778c19eb..3aed0ed6f2e9 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -122,6 +122,10 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_compute_energy_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_entry_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_exit_tp); EXPORT_TRACEPOINT_SYMBOL_GPL(sched_set_need_resched_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_throttle_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_replenish_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_server_start_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_server_stop_tp); =20 DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); DEFINE_PER_CPU(struct rnd_state, sched_rnd_state); diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index 319439fe1870..2192e9f42e02 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -733,6 +733,7 @@ static inline void replenish_dl_new_period(struct sched= _dl_entity *dl_se, dl_se->dl_throttled =3D 1; dl_se->dl_defer_armed =3D 1; } + trace_sched_dl_replenish_tp(dl_se, cpu_of(rq)); } =20 /* @@ -850,6 +851,8 @@ static void replenish_dl_entity(struct sched_dl_entity = *dl_se) if (dl_se->dl_throttled) dl_se->dl_throttled =3D 0; =20 + trace_sched_dl_replenish_tp(dl_se, cpu_of(rq)); + /* * If this is the replenishment of a deferred reservation, * clear the flag and return. @@ -1341,6 +1344,7 @@ static inline void dl_check_constrained_dl(struct sch= ed_dl_entity *dl_se) dl_time_before(rq_clock(rq), dl_next_period(dl_se))) { if (unlikely(is_dl_boosted(dl_se) || !start_dl_timer(dl_se))) return; + trace_sched_dl_throttle_tp(dl_se, cpu_of(rq)); dl_se->dl_throttled =3D 1; if (dl_se->runtime > 0) dl_se->runtime =3D 0; @@ -1504,6 +1508,7 @@ static void update_curr_dl_se(struct rq *rq, struct s= ched_dl_entity *dl_se, s64 =20 throttle: if (dl_runtime_exceeded(dl_se) || dl_se->dl_yielded) { + trace_sched_dl_throttle_tp(dl_se, cpu_of(rq)); dl_se->dl_throttled =3D 1; =20 /* If requested, inform the user about runtime overruns. */ @@ -1795,6 +1800,7 @@ void dl_server_start(struct sched_dl_entity *dl_se) if (WARN_ON_ONCE(!cpu_online(cpu_of(rq)))) return; =20 + trace_sched_dl_server_start_tp(dl_se, cpu_of(rq)); dl_se->dl_server_active =3D 1; enqueue_dl_entity(dl_se, ENQUEUE_WAKEUP); if (!dl_task(dl_se->rq->curr) || dl_entity_preempt(dl_se, &rq->curr->dl)) @@ -1806,6 +1812,7 @@ void dl_server_stop(struct sched_dl_entity *dl_se) if (!dl_server(dl_se) || !dl_server_active(dl_se)) return; =20 + trace_sched_dl_server_stop_tp(dl_se, cpu_of(dl_se->rq)); dequeue_dl_entity(dl_se, DEQUEUE_SLEEP); hrtimer_try_to_cancel(&dl_se->dl_timer); dl_se->dl_defer_armed =3D 0; --=20 2.52.0