From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 2B5023C65EA for ; Mon, 30 Mar 2026 11:11:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774869092; cv=none; b=mTg2T9jyGk2g9u1tLaYZ+agzEi25yqSgq7S0lw9LM4Iah1qmyniZeijBnJsUjTjTrHexNWJmlUAEjDYY+c1zZ7zUIkkWP0l8CDgL2aoBUn2op/oFrRbtFuFhK7c36ihoa9GFVXGi0w5S3WDDXcnXfaOmUU69X54qUOOXGNk2SwA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774869092; c=relaxed/simple; bh=hQ90+FM1Zq/m791vTfWiWUs5fKmYcfr5kOGHbnF2q0s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:content-type; b=Aa4Ipgz29Ml5t5bsvYL1DsxZIID6WZxo8faB7y+xz3yZuqiUtrb5Uz35SjBU/SNeP2w+NvZHblMN4TlZl6RR9lX9vJt8dyuiKxXARWUIAm6YGzR7R7Ep3DzGToyC4lgzvg1VKq2F4SeEwXCxGb2T0O17DVxTCmEeykMTLnTy7Xo= 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=eDhjx825; arc=none smtp.client-ip=170.10.129.124 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="eDhjx825" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774869083; h=from:from: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=1BmuGhE2+f4hZY16N2T5Ew7x2eInbFrBNUdmzLiXctk=; b=eDhjx8252+lMU8clLcfwArmUBdWRrhdc+hf1b2xx/Ec0IrFy/0U6gLo7WnO+J/cu71wuwp etbM37yGa8E7vnOQCHxDTnP7OPYABiFHUmePMVPkq4XHpXpNbdgthfvewJ60MAMsQl+2B1 0eWL+lqACZEbUMO/zrEpVI2UJHgP110= Received: from mx-prod-mc-08.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-191-Qhp_81vGMsOcWOStHYnmVg-1; Mon, 30 Mar 2026 07:11:22 -0400 X-MC-Unique: Qhp_81vGMsOcWOStHYnmVg-1 X-Mimecast-MFC-AGG-ID: Qhp_81vGMsOcWOStHYnmVg_1774869080 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (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-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 64C81180058A; Mon, 30 Mar 2026 11:11:20 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.rmtit.csb (unknown [10.44.33.13]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 9B5CD30001A2; Mon, 30 Mar 2026 11:11:14 +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 v8 10/12] sched: Add deadline tracepoints Date: Mon, 30 Mar 2026 13:10:08 +0200 Message-ID: <20260330111010.153663-11-gmonaco@redhat.com> In-Reply-To: <20260330111010.153663-1-gmonaco@redhat.com> References: <20260330111010.153663-1-gmonaco@redhat.com> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: TvcOhVsJBUu1uf8Y2YOPUIH4f71e-oa2NTDLkIG0zDg_1774869080 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Add the following tracepoints: * sched_dl_throttle(dl_se, cpu, type): Called when a deadline entity is throttled * sched_dl_replenish(dl_se, cpu, type): Called when a deadline entity's runtime is replenished * sched_dl_update(dl_se, cpu, type): Called when a deadline entity updates without throttle or replenish * sched_dl_server_start(dl_se, cpu, type): Called when a deadline server is started * sched_dl_server_stop(dl_se, cpu, type): 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: V8: * Use u8 instead of uint8_t V7: * Export sched_dl_update to modules and fix style V6: * Add dl_se type to differentiate between fair and ext servers * Add event to track dl_update_curr not firing other events include/trace/events/sched.h | 26 ++++++++++++++++++++++++++ kernel/sched/core.c | 5 +++++ kernel/sched/deadline.c | 23 +++++++++++++++++++++++ 3 files changed, 54 insertions(+) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 7b2645b50e78..535860581f15 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -896,6 +896,32 @@ DECLARE_TRACE(sched_set_need_resched, TP_PROTO(struct task_struct *tsk, int cpu, int tif), TP_ARGS(tsk, cpu, tif)); +#define DL_OTHER 0 +#define DL_TASK 1 +#define DL_SERVER_FAIR 2 +#define DL_SERVER_EXT 3 + +DECLARE_TRACE(sched_dl_throttle, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu, u8 type), + TP_ARGS(dl_se, cpu, type)); + +DECLARE_TRACE(sched_dl_replenish, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu, u8 type), + TP_ARGS(dl_se, cpu, type)); + +/* Call to update_curr_dl_se not involving throttle or replenish */ +DECLARE_TRACE(sched_dl_update, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu, u8 type), + TP_ARGS(dl_se, cpu, type)); + +DECLARE_TRACE(sched_dl_server_start, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu, u8 type), + TP_ARGS(dl_se, cpu, type)); + +DECLARE_TRACE(sched_dl_server_stop, + TP_PROTO(struct sched_dl_entity *dl_se, int cpu, u8 type), + TP_ARGS(dl_se, cpu, type)); + #endif /* _TRACE_SCHED_H */ /* This part must be outside protection */ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 496dff740dca..6a043f11b79d 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -122,6 +122,11 @@ 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_update_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_server_start_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dl_server_stop_tp); 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 d08b00429323..e511e36916bd 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -115,6 +115,19 @@ static inline bool is_dl_boosted(struct sched_dl_entity *dl_se) } #endif /* !CONFIG_RT_MUTEXES */ +static inline u8 dl_get_type(struct sched_dl_entity *dl_se, struct rq *rq) +{ + if (!dl_server(dl_se)) + return DL_TASK; + if (dl_se == &rq->fair_server) + return DL_SERVER_FAIR; +#ifdef CONFIG_SCHED_CLASS_EXT + if (dl_se == &rq->ext_server) + return DL_SERVER_EXT; +#endif + return DL_OTHER; +} + static inline struct dl_bw *dl_bw_of(int i) { RCU_LOCKDEP_WARN(!rcu_read_lock_sched_held(), @@ -733,6 +746,7 @@ static inline void replenish_dl_new_period(struct sched_dl_entity *dl_se, dl_se->dl_throttled = 1; dl_se->dl_defer_armed = 1; } + trace_sched_dl_replenish_tp(dl_se, cpu_of(rq), dl_get_type(dl_se, rq)); } /* @@ -848,6 +862,8 @@ static void replenish_dl_entity(struct sched_dl_entity *dl_se) if (dl_se->dl_throttled) dl_se->dl_throttled = 0; + trace_sched_dl_replenish_tp(dl_se, cpu_of(rq), dl_get_type(dl_se, rq)); + /* * If this is the replenishment of a deferred reservation, * clear the flag and return. @@ -1345,6 +1361,7 @@ static inline void dl_check_constrained_dl(struct sched_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_get_type(dl_se, rq)); dl_se->dl_throttled = 1; if (dl_se->runtime > 0) dl_se->runtime = 0; @@ -1508,6 +1525,7 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 throttle: if (dl_runtime_exceeded(dl_se) || dl_se->dl_yielded) { + trace_sched_dl_throttle_tp(dl_se, cpu_of(rq), dl_get_type(dl_se, rq)); dl_se->dl_throttled = 1; /* If requested, inform the user about runtime overruns. */ @@ -1532,6 +1550,8 @@ static void update_curr_dl_se(struct rq *rq, struct sched_dl_entity *dl_se, s64 if (!is_leftmost(dl_se, &rq->dl)) resched_curr(rq); + } else { + trace_sched_dl_update_tp(dl_se, cpu_of(rq), dl_get_type(dl_se, rq)); } /* @@ -1810,6 +1830,7 @@ void dl_server_start(struct sched_dl_entity *dl_se) if (WARN_ON_ONCE(!cpu_online(cpu_of(rq)))) return; + trace_sched_dl_server_start_tp(dl_se, cpu_of(rq), dl_get_type(dl_se, rq)); dl_se->dl_server_active = 1; enqueue_dl_entity(dl_se, ENQUEUE_WAKEUP); if (!dl_task(dl_se->rq->curr) || dl_entity_preempt(dl_se, &rq->curr->dl)) @@ -1821,6 +1842,8 @@ void dl_server_stop(struct sched_dl_entity *dl_se) if (!dl_server(dl_se) || !dl_server_active(dl_se)) return; + trace_sched_dl_server_stop_tp(dl_se, cpu_of(dl_se->rq), + dl_get_type(dl_se, dl_se->rq)); dequeue_dl_entity(dl_se, DEQUEUE_SLEEP); hrtimer_try_to_cancel(&dl_se->dl_timer); dl_se->dl_defer_armed = 0; -- 2.53.0