From nobody Sun Dec 14 11:34:34 2025 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 B930025A635 for ; Tue, 4 Feb 2025 05:21:22 +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=1738646487; cv=none; b=gdN4YnliEIxoO7xNy7LYRdb7k/U5dkUsPjop4WwxtNIjnQ1aWrS8hH990J8rRamgJtMBW0opLA04rKTBe96ScMszWc/wuIetF2jEJn8JeRckAlInmnzYwQXwlgzFHjzgCSBwu8xpjckUcEGNBN8vr72AaB+r4SvfrvNTpdJysZE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738646487; c=relaxed/simple; bh=Rmsqs3RbVZLXEtombTMxqagQ8sIbesMxq6d8VcKK9vo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mjz41JjdFobpVyjnM1oHXMRxyl0r24Opt2/rS3Xxk9C62j5DCJ29oJRES/NSoAbIx2fdstgrDOIJYawLFSmWxHjwwNK0SPRHoLdslQv6u+Z94YaQEve6iRcOlBmPGY+BozIYNvaJ0FJK/HTu8G8PrCB3Y5ZOUk2LSQl8PuJF3Kg= 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=VSjlcYXj; 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="VSjlcYXj" 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=AJslrF4TGjr61ixox4sklLLk+bB81YEp0Sp/IRhoECY=; b=VSjlcYXjJrqFMCGoGT43N73JqC HklC0JV+Nbh09hBBRk0mr1OFGW4f2RlKL08lh84FOiSrASyiaPQHJXXtw0PZFB4e8/AGg3ZR7wkqK hLsQiP55qJ1WKzqIjsKm37jjQbqoLKqSnjEtt1eru3NPxNRKKAmuC/ogJivKKAEmYqb76wA0S950f ZpqFlSyMJkN1rrmESlL8TJY83evlHFz+mmcN/m62FVIKdnOmBiuHyIj208H+xYlbcU3xcOqNGHLMK lW2g4tU/XhkV48kIgxTVocSXtODWkSlmmUXgpdhu7dTm7rBrMmRVJOCXNNSazflXNNZ5LZo+aeLlt QhRW5sKw==; 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 1tfBMw-003J1Y-NX; Tue, 04 Feb 2025 06:21:13 +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 v4 1/7] sched_ext: Add an event, SCX_EV_ENQ_SKIP_EXITING Date: Tue, 4 Feb 2025 14:20:51 +0900 Message-ID: <20250204052057.67776-2-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250204052057.67776-1-changwoo@igalia.com> References: <20250204052057.67776-1-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, SCX_EV_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 | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index cbb3d059072f..c72ba405a1d3 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1461,6 +1461,12 @@ struct scx_event_stats { * continued to run because there were no other tasks on the CPU. */ u64 SCX_EV_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 SCX_EV_ENQ_SKIP_EXITING; }; =20 /* @@ -2068,8 +2074,10 @@ 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(SCX_EV_ENQ_SKIP_EXITING, 1); goto local; + } =20 if (!SCX_HAS_OP(enqueue)) goto global; @@ -4985,6 +4993,7 @@ static void scx_dump_state(struct scx_exit_info *ei, = size_t dump_len) scx_dump_event(s, &events, SCX_EV_SELECT_CPU_FALLBACK); scx_dump_event(s, &events, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE); scx_dump_event(s, &events, SCX_EV_DISPATCH_KEEP_LAST); + scx_dump_event(s, &events, SCX_EV_ENQ_SKIP_EXITING); =20 if (seq_buf_has_overflowed(&s) && dump_len >=3D sizeof(trunc_marker)) memcpy(ei->dump + dump_len - sizeof(trunc_marker), @@ -7121,6 +7130,7 @@ __bpf_kfunc void scx_bpf_events(struct scx_event_stat= s *events, scx_agg_event(&e_sys, e_cpu, SCX_EV_SELECT_CPU_FALLBACK); scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_LOCAL_DSQ_OFFLINE); scx_agg_event(&e_sys, e_cpu, SCX_EV_DISPATCH_KEEP_LAST); + scx_agg_event(&e_sys, e_cpu, SCX_EV_ENQ_SKIP_EXITING); } =20 /* --=20 2.48.1