From nobody Mon Feb 9 23:00:57 2026 Received: from fanzine2.igalia.com (fanzine.igalia.com [178.60.130.6]) (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 B68D5186E40 for ; Sun, 26 Jan 2025 10:16:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=178.60.130.6 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737886611; cv=none; b=hpZyyJorW8OMMmfj1Z09vscpqwwVaUa7Kv4TTbnsg4whV+Lt0TX++KMBS5Ueq2FT9bfEORmRnE3CvZi942e+Ti7KKN3TeunSgnwo/HTAoXPkxIK9VEbhDHhSvohXM0mn8iLvGh4xeJn32Tb1wZ/QbQ2gB3xlAYxNdL7qL4klnmY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737886611; c=relaxed/simple; bh=zFuS9ZcQDsAjS5HqYYoPXtxPu+UeaBqU+gSayoA/bb8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eMYZnvGgvngkAz0WsVWZaELkV2NjI1x6mttdMAmD3/z6tNpuOAXIs53/6Hg+a9CojZozvKDNxi3yESR8PwWz/UxeId32/rxqL9kblz1azeH+nxbHz4EEOK2RyBiCrwkRlpf9e7HjHYUfHBlP9IxgEMDT8kXcs95cB6kLLF5eSAg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com; spf=pass smtp.mailfrom=igalia.com; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b=JlXhciw2; arc=none smtp.client-ip=178.60.130.6 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=igalia.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=igalia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="JlXhciw2" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=MIWvX2Di+r1WJIro6JO8UvyngHbAGwuTEV1An1K7toc=; b=JlXhciw2ZX9T5S3SY3Ea1nNqyi 8uqtfHMvFCwmbir/dCjv+t3UDdYM2255FhzGoSbMCJakgA1VIyiVDWh8j6gJCFg/lG6kYCCIGHYRr O1dGbVBxF2nnHazXF8xnGug2/RlvtIEs8NTBfEwsQXsFACOVRy9bGjesZAgddL932+9vgG3e3S9ux 2EN4hvUV6IhbdemJ+eBqZlcgzC2O4QU6jcaX7YDLc8s7SxioT0ggBY5XO+TAfgJDulmbVajhlP8Z+ o6qMNe2pGbo95nNnNVPE8mKzddGJvtE0j+9qWVkrxFfWTjQWzbkyiTlrWCFDeQGgW8sQzaLId2EhU jHV/79sQ==; Received: from [58.29.143.236] (helo=localhost) by fanzine2.igalia.com with utf8esmtpsa (Cipher TLS1.3:ECDHE_SECP256R1__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim) id 1tbzh5-002ljX-GH; Sun, 26 Jan 2025 11:16:43 +0100 From: Changwoo Min To: tj@kernel.org, void@manifault.com, arighi@nvidia.com Cc: kernel-dev@igalia.com, linux-kernel@vger.kernel.org, Changwoo Min Subject: [PATCH v2 06/11] sched_ext: Add an event, ENQ_SKIP_EXITING Date: Sun, 26 Jan 2025 19:16:09 +0900 Message-ID: <20250126101614.232388-7-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250126101614.232388-1-changwoo@igalia.com> References: <20250126101614.232388-1-changwoo@igalia.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 Content-Type: text/plain; charset="utf-8" Add a core event, ENQ_SKIP_EXITING, which represents how many times a task is enqueued to a local DSQ when exiting if SCX_OPS_ENQ_EXITING is not set. __scx_add_event() is used since the caller holds an rq lock, so the preemption has already been disabled. Signed-off-by: Changwoo Min --- kernel/sched/ext.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index d3a1ef58202c..6dc86bc06596 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1479,6 +1479,12 @@ struct scx_event_stats { * continued to run because there were no other tasks on the CPU. */ u64 DISPATCH_KEEP_LAST; + + /* + * If SCX_OPS_ENQ_EXITING is not set, the number of times that a task + * is dispatched to a local DSQ when exiting. + */ + u64 ENQ_SKIP_EXITING; }; =20 /* @@ -2086,8 +2092,10 @@ static void do_enqueue_task(struct rq *rq, struct ta= sk_struct *p, u64 enq_flags, =20 /* see %SCX_OPS_ENQ_EXITING */ if (!static_branch_unlikely(&scx_ops_enq_exiting) && - unlikely(p->flags & PF_EXITING)) + unlikely(p->flags & PF_EXITING)) { + __scx_add_event(ENQ_SKIP_EXITING, 1); goto local; + } =20 if (!SCX_HAS_OP(enqueue)) goto global; @@ -5508,6 +5516,7 @@ static void scx_dump_state(struct scx_exit_info *ei, = size_t dump_len) scx_dump_event(s, &events, SELECT_CPU_FALLBACK); scx_dump_event(s, &events, DISPATCH_LOCAL_DSQ_OFFLINE); scx_dump_event(s, &events, DISPATCH_KEEP_LAST); + scx_dump_event(s, &events, ENQ_SKIP_EXITING); =20 if (seq_buf_has_overflowed(&s) && dump_len >=3D sizeof(trunc_marker)) memcpy(ei->dump + dump_len - sizeof(trunc_marker), --=20 2.48.1