From nobody Sat Feb 7 08:27:54 2026 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 115A137104C for ; Thu, 22 Jan 2026 15:56:08 +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=1769097377; cv=none; b=IM11RCAGvwsk0WL69lj+0EFQFflHsTDRtSacVUD52fsxEEyFUax2H40OwxvyM501qwOhWG15OFUOWjAGo+7jsEQeFL8fHct4FCTch/n9OVWq92AedZ3/Ja20102+vs4i2dh+ac+0CHS2T5zJXY1YiKiqW5bzyAYjVJa68To7oCU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769097377; c=relaxed/simple; bh=ccMuRZZzqUbjnmmOt1JP4b1kjw3eJYpy/hMwBfKv250=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ay1Y0cUyq/nt9gRQ1PPdiiEVAqv7erBRqUNP5RewNDEAn/22j9Q8L2Z3Hq4sKvJRKnsf5HLxZuHktr5rWm7rXrk/wX3y/KX7DzCjc5DYdfAdtKvY7gGDc6HMeUSvZdgj0pgR7HV57sUHiSomBA62ZVhLcikO5UpXJkYultXmzTA= 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=AUpaBi0N; 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="AUpaBi0N" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769097364; 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=gEEaeroR08uxsO7hDGjRulPNvvqv2h+6CVs5VDfNnIY=; b=AUpaBi0NI2VlaeOShrICjGT42LIcYcx0H4kKZWBpFII5Tqox17qPYJ5yX2BUdAk43n8Wg0 XU/DaINCLQIsk24aMgYHY+sNd2TZe7WyTRX9GIG8IGA7k4d4JzhMKty9hs+7o7rauKsidt HdCDPl4Y3dmPuk3NM6VCq1UuY2qpbLo= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-256-77-oDRzINrK97btzlrII4g-1; Thu, 22 Jan 2026 10:56:00 -0500 X-MC-Unique: 77-oDRzINrK97btzlrII4g-1 X-Mimecast-MFC-AGG-ID: 77-oDRzINrK97btzlrII4g_1769097359 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-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D7DC418005BF; Thu, 22 Jan 2026 15:55:58 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.rmtit.csb (unknown [10.45.224.47]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 935881801A46; Thu, 22 Jan 2026 15:55:52 +0000 (UTC) From: Gabriele Monaco To: linux-kernel@vger.kernel.org, Steven Rostedt , Nam Cao , Juri Lelli , Masami Hiramatsu , Ingo Molnar , Peter Zijlstra , linux-trace-kernel@vger.kernel.org Cc: Gabriele Monaco , Phil Auld , Juri Lelli , Tomas Glozar , Clark Williams , John Kacur Subject: [PATCH v5 08/15] sched: Add deadline tracepoints Date: Thu, 22 Jan 2026 16:54:53 +0100 Message-ID: <20260122155500.362683-9-gmonaco@redhat.com> In-Reply-To: <20260122155500.362683-1-gmonaco@redhat.com> References: <20260122155500.362683-1-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. Reviewed-by: Phil Auld Acked-by: Juri Lelli Signed-off-by: Gabriele Monaco --- 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 6380afe3de63..f6293fa02fb7 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 7441b7e52cd9..a69d2f073916 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. */ @@ -1800,6 +1805,7 @@ 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)) @@ -1811,6 +1817,7 @@ 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