From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 B4ACB3D9541 for ; Mon, 31 Aug 2026 09:07:06 +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=1788167228; cv=none; b=WBp6Os/0HjE57FitumNv4EQRLGJTeoDaTe+j7Qh+0IUsqeyLvctf9FHc5gN0rY5Z4PY+1u/tUW+Bm7Kd+xauGa8+CQ20ld78EURW2zDL4sAd4b6jgwd2DzuGI+Y1ELlRCa23flDJM2vzv9Sro0wSSwfb9Sgkm3WxkWRA1JsQqh0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788167228; c=relaxed/simple; bh=j9Bk+0pj2/24u8T6/SP13Tt6ikszrpnpvXPCcD/6MLU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ajkUn6/j8eNXTzwFozViY7cUwFD6kE9DeQvKRIi3ud1De9y8AvzPRbzAx4VpzQP6z1CoLqciTnyHcmPqbu+teB0CsGVhWAR49AElpnrsa1XHQgNSbLIii4/f0g52pnzpVpb51CrxZcBWeV8Dl/xTdyBi3aG1Z7KBGnDXjdl+f/k= 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=fwPiLMqQ; 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="fwPiLMqQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1788167225; 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=7jsHCsFIe83xcZRq1DwfLWv9aF61ZEwjfkBd6QeliCQ=; b=fwPiLMqQ+KTc9drDsy0XeoFPhjja2Yf2mn0zi+kmm70i86RxmeldYyc+U9Bt4AsO1fO8WR xafLYDfywupK+VTyT3aBLYXXZqEU3PJcOa8lJQBLstvCkP3FrXuwSBOTHFpGgf03Uv/E49 fVUYeBTXFKHewlk1aDjaatiKDpNoD88= 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-262-3GBh1lUkPE2U7wQ8A-ui3Q-1; Mon, 31 Aug 2026 05:07:00 -0400 X-MC-Unique: 3GBh1lUkPE2U7wQ8A-ui3Q-1 X-Mimecast-MFC-AGG-ID: 3GBh1lUkPE2U7wQ8A-ui3Q_1788167219 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 DB240182E6B4; Mon, 31 Aug 2026 09:06:58 +0000 (UTC) Received: from gmonaco-thinkpadt14gen3.redhat.corp (headnet05.pony-001.prod.iad2.dc.redhat.com [10.2.32.117]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id C234C18005BB; Mon, 31 Aug 2026 09:06:53 +0000 (UTC) From: Gabriele Monaco To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Ingo Molnar , Peter Zijlstra Cc: Nam Cao , K Prateek Nayak , Gabriele Monaco , Wen Yang , Tobias Schaffner , Viktor Malik Subject: [RFC PATCH 01/20] sched: Add task enqueue/dequeue trace points Date: Mon, 31 Aug 2026 11:05:05 +0200 Message-ID: <20260831090524.106845-2-gmonaco@redhat.com> In-Reply-To: <20260831090524.106845-1-gmonaco@redhat.com> References: <20260831090524.106845-1-gmonaco@redhat.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 From: Nam Cao Add trace points into enqueue_task() and dequeue_task(). Signed-off-by: Nam Cao Suggested-by: Peter Zijlstra Reviewed-by: K Prateek Nayak Co-developed-by: Gabriele Monaco Signed-off-by: Gabriele Monaco --- include/trace/events/sched.h | 8 ++++++++ kernel/sched/core.c | 12 +++++++++++- kernel/sched/sched.h | 2 ++ 3 files changed, 21 insertions(+), 1 deletion(-) diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 535860581f15..d6e41edc25d2 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -896,6 +896,14 @@ DECLARE_TRACE(sched_set_need_resched, TP_PROTO(struct task_struct *tsk, int cpu, int tif), TP_ARGS(tsk, cpu, tif)); +DECLARE_TRACE(sched_enqueue, + TP_PROTO(struct task_struct *tsk, int cpu), + TP_ARGS(tsk, cpu)); + +DECLARE_TRACE(sched_dequeue, + TP_PROTO(struct task_struct *tsk, int cpu), + TP_ARGS(tsk, cpu)); + #define DL_OTHER 0 #define DL_TASK 1 #define DL_SERVER_FAIR 2 diff --git a/kernel/sched/core.c b/kernel/sched/core.c index f78275192036..8561ca324943 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -121,6 +121,8 @@ 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_enqueue_tp); +EXPORT_TRACEPOINT_SYMBOL_GPL(sched_dequeue_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); @@ -2181,6 +2183,9 @@ unsigned long get_wchan(struct task_struct *p) void enqueue_task(struct rq *rq, struct task_struct *p, int flags) { + if (trace_sched_enqueue_tp_enabled() && !(flags & ENQUEUE_DELAYED)) + trace_sched_enqueue_tp(p, cpu_of(rq)); + if (!(flags & ENQUEUE_NOCLOCK)) update_rq_clock(rq); @@ -2207,6 +2212,8 @@ void enqueue_task(struct rq *rq, struct task_struct *p, int flags) */ inline bool dequeue_task(struct rq *rq, struct task_struct *p, int flags) { + bool ret; + if (sched_core_enabled(rq)) sched_core_dequeue(rq, p, flags); @@ -2223,7 +2230,10 @@ inline bool dequeue_task(struct rq *rq, struct task_struct *p, int flags) * and mark the task ->sched_delayed. */ uclamp_rq_dec(rq, p); - return p->sched_class->dequeue_task(rq, p, flags); + ret = p->sched_class->dequeue_task(rq, p, flags); + if (trace_sched_dequeue_tp_enabled() && !(flags & DEQUEUE_SLEEP)) + trace_sched_dequeue_tp(p, cpu_of(rq)); + return ret; } void activate_task(struct rq *rq, struct task_struct *p, int flags) diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index e656c7059bf8..a2cb06beafe6 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -3070,6 +3070,8 @@ static inline void sub_nr_running(struct rq *rq, unsigned count) static inline void __block_task(struct rq *rq, struct task_struct *p) { + trace_sched_dequeue_tp(p, cpu_of(rq)); + if (p->sched_contributes_to_load) rq->nr_uninterruptible++; -- 2.55.0