From nobody Sun Dec 14 14:17:53 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 9F16122C33A for ; Thu, 16 Jan 2025 15:16:21 +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=1737040583; cv=none; b=qo0qzUcUhGX/s3jSC46CSGiL5Z0Pd9XMHqLABE52rIBo5he/0AVi3tqXjXcJ8PfJgUyF943m87fU1/zYtnTn/s/ZAuNLc/uFifUnVz2Izz8afRsl9RtwyaJNNzflz7xl22crCcJpub0YZ9mE2GazwC6M+/yW5gjvZaD4nGbz3oU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737040583; c=relaxed/simple; bh=Oxk+b7RIHWW5PAswDzA8NL2PZ1n/6kQLhYKUbL+pZVA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=kspoKe0G5+fjIVLtj0sxeyN40RN5Cs+NkKxYi2iapZbuw9quUaZjSjm3A/pMCaBWmukWwtfErhXBpfcDCN6V828HPuegXYZdh/0NIDi+vdjD5HK6sygB4P1N2ENe59KfRjE8dg/TSGnjM9Px0CE5ewxUAzPy4+pjdfp0M2eMv+g= 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=Cg8zG7IK; 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="Cg8zG7IK" 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=12gjMM8R/Ps3EP/oVkUXmP65UiUrMH6+ZbZN7OpoRWM=; b=Cg8zG7IKi210zMbWB+m7hhz7c+ uQ4RGvnnLmurJ9/BrkKEXVwd4X0K8lcoORkLsSGeSW+NyjZHFYPUiO5HbRG7xjj5T71TXy8LduSrf 1WxuockMD0nYdpGOyB8c/diBPKZkMoJpQoUxVzoD+JHm93PNtnNuwBTaLAWa8bvvjyYh7lr6JXrVL U/oM5Q+mkFfog6YvHdMEWDWh/QyRGk3f3AKkXwIwx9TlkLp2AZGHQklfV13igmtIEPBRUDORAfB4W ypILyQ/PsKXl/TYXswxT2fjHthkdiCJWwiKk9Kq//tq9ureHX+emqHrY87Cv/mTs7BWixMUHml11B F+3HZ1EQ==; 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 1tYRbT-00Gi0q-4f; Thu, 16 Jan 2025 16:16:15 +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 2/7] sched_ext: Add an event, SCX_EVENT_OFFLINE_LOCAL_DSQ Date: Fri, 17 Jan 2025 00:15:38 +0900 Message-ID: <20250116151543.80163-3-changwoo@igalia.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250116151543.80163-1-changwoo@igalia.com> References: <20250116151543.80163-1-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_EVENT_OFFLINE_LOCAL_DSQ, which represents how many times a BPF scheduler tries to dispatch to an offlined local DSQ. Signed-off-by: Changwoo Min --- kernel/sched/ext.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 7e12d5b8322e..8054e4e5ed0c 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -1467,6 +1467,12 @@ struct scx_event_stat { * the core scheduler code silently picks a fallback CPU. */ u64 INVAL_SELECT_CPU; + + /* + * When dispatching to a local DSQ, the CPU may have gone offline in + * the meantime. In this case, the task is bounced to the global DSQ. + */ + u64 OFFLINE_LOCAL_DSQ; }; =20 #define SCX_EVENT_IDX(e) (offsetof(struct scx_event_stat, e)/sizeof(u64)) @@ -1479,11 +1485,13 @@ struct scx_event_stat { enum scx_event_kind { SCX_EVENT_BEGIN =3D 0, SCX_EVENT_DEFINE(INVAL_SELECT_CPU), + SCX_EVENT_DEFINE(OFFLINE_LOCAL_DSQ), SCX_EVENT_END =3D SCX_EVENT_END_IDX(), }; =20 static const char *scx_event_stat_str[] =3D { [SCX_EVENT_INVAL_SELECT_CPU] =3D "invalid_select_cpu", + [SCX_EVENT_OFFLINE_LOCAL_DSQ] =3D "offline_local_dsq", }; =20 /* @@ -2651,6 +2659,7 @@ static void dispatch_to_local_dsq(struct rq *rq, stru= ct scx_dispatch_q *dst_dsq, if (unlikely(!task_can_run_on_remote_rq(p, dst_rq, true))) { dispatch_enqueue(find_global_dsq(p), p, enq_flags | SCX_ENQ_CLEAR_OPSS); + scx_add_event(OFFLINE_LOCAL_DSQ, 1); return; } =20 --=20 2.48.1