From nobody Tue Feb 10 17:08:31 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 3BD5D1991CD for ; Fri, 31 Jan 2025 07:10:23 +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=1738307425; cv=none; b=uvrIYHsvvAuGhavHUcl6vGcL1H8ExWMMIGTDcsGK/qTceQhLuSz1nQ0+lcicGutRNChK2M3ezufQNOYV+2jKm6m6AoXl+PKMuV2h0IJvOPne+/RwEyDSBOmI/SI0WH+VTH24F6yqmUPhyC/8lhyYfGv0MrTf+qmqW3a2uOoEuUg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738307425; c=relaxed/simple; bh=mXdQzqXcH4zKY5o96idyYEdbQkIzhskgmnZIKyFbBcY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HXLjCVi7iPJiPYeTLY8farKTngP18154pFVBKIR7Ece5gxtMtGwcu72XYhS7ht7VGCzaXtRS/MNRy8CzEfWVv4XuBJQhDa1vRCFEfFi00Aj7grmhG2jVycNYW2xYVTOHL2dLlUzPKDPQGf4gjo0eRYtBCaMZUYAAM9MkaLKxNgU= 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=sBB+tfEP; 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="sBB+tfEP" 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=fWzhjrX4qthxXZF2x/QTL0MwkUO4yL8TN0VU/ObpBQc=; b=sBB+tfEPw2hzTaW01saDldMcNM 3tG1ng38mQlgWrXohbYY5pOMohM0WxQC21K6kWSw16R8lolvTQOqD/hyrRGc78dRrRoBNWkaSxtxw x5ygpBqXizOF2NccX72Kzv+N8EMiA951RpmiKY4YpgsBcKROJwzb69srNtYCOaLofgRUl0BOt1NUa nlUn9zt2Hi8x+r944MLwRt4y3sf1bZOMWZ4D45syfQvsdcKv6enA9+rOXqa910/z8CjLQy0biw2nf pDcd03MclhM7+hFZeS5gfwKhvcCJmW3WTL/3jnBkCWzTINHStf2A8gkwRB6vZF2YkIRuRzPEoczxG sWyMU/LA==; 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 1tdlAK-001Ka9-9w; Fri, 31 Jan 2025 08:10:18 +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 v3 07/11] sched_ext: Add an event, SCX_EV_BYPASS_DISPATCH Date: Fri, 31 Jan 2025 16:09:34 +0900 Message-ID: <20250131070938.95551-8-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250131070938.95551-1-changwoo@igalia.com> References: <20250131070938.95551-1-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_BYPASS_DISPATCH, which represents how many tasks have been dispatched in the bypass mode. __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 | 27 +++++++++++++++++++++++---- 1 file changed, 23 insertions(+), 4 deletions(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 07d54b52e971..236cdb0071eb 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1468,6 +1468,11 @@ struct scx_event_stats { */ u64 SCX_EV_ENQ_SKIP_EXITING; =20 + /* + * The number of tasks dispatched in the bypassing mode. + */ + u64 SCX_EV_BYPASS_DISPATCH; + /* * The number of times the bypassing mode has been activated. */ @@ -2869,11 +2874,17 @@ static int balance_one(struct rq *rq, struct task_s= truct *prev) } =20 /* if there already are tasks to run, nothing to do */ - if (rq->scx.local_dsq.nr) + if (rq->scx.local_dsq.nr) { + if (scx_rq_bypassing(rq)) + __scx_add_event(SCX_EV_BYPASS_DISPATCH, 1); goto has_tasks; + } =20 - if (consume_global_dsq(rq)) + if (consume_global_dsq(rq)) { + if (scx_rq_bypassing(rq)) + __scx_add_event(SCX_EV_BYPASS_DISPATCH, 1); goto has_tasks; + } =20 if (!SCX_HAS_OP(dispatch) || scx_rq_bypassing(rq) || !scx_rq_online(rq)) goto no_tasks; @@ -2899,10 +2910,16 @@ static int balance_one(struct rq *rq, struct task_s= truct *prev) rq->scx.flags |=3D SCX_RQ_BAL_KEEP; goto has_tasks; } - if (rq->scx.local_dsq.nr) + if (rq->scx.local_dsq.nr) { + if (scx_rq_bypassing(rq)) + __scx_add_event(SCX_EV_BYPASS_DISPATCH, 1); goto has_tasks; - if (consume_global_dsq(rq)) + } + if (consume_global_dsq(rq)) { + if (scx_rq_bypassing(rq)) + __scx_add_event(SCX_EV_BYPASS_DISPATCH, 1); goto has_tasks; + } =20 /* * ops.dispatch() can trap us in this loop by repeatedly @@ -5001,6 +5018,7 @@ static void scx_dump_state(struct scx_exit_info *ei, = size_t dump_len) 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); + scx_dump_event(s, &events, SCX_EV_BYPASS_DISPATCH); scx_dump_event(s, &events, SCX_EV_BYPASS_ACTIVATE); =20 if (seq_buf_has_overflowed(&s) && dump_len >=3D sizeof(trunc_marker)) @@ -7138,6 +7156,7 @@ __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_BYPASS_DISPATCH); scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_ACTIVATE); } =20 --=20 2.48.1