From nobody Mon Feb 9 18:43:28 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 B83711AF0C3 for ; Fri, 31 Jan 2025 07:10:28 +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=1738307430; cv=none; b=cWg9ktdIBIKyIyuE12P3LroeAM95zXqYuRh850PTtk+UXE9LkPMiKINKLYdlNOuq9F7rDVxNjumhD137nymdDsBrGI33Qh4xhau1kiViuEPDNyqQo+K1TtSDCPUSyiYR65TRqdsOxbI3nlqt3VDCndf7zy7MFmAUum0UWJ7kDl4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1738307430; c=relaxed/simple; bh=/ZvKVk8rZeGtmp6VLLD4DU6idDxy5o/EYItE8QUyDF8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DH5NWw4LoUhPY42FVm9oDe10wl2zUsDWa2p3AJHOw456hfZiCSrNRdJLm7sKQpD/Y5bTi823T8MQdab3MRZ33YglKNTpYdl8XAshCF4+wX1+c3MDR+CRKsOfPsAGvpFDZwIc6BLy3Eo/M71rVw9EI5m6naYR99pnzrTY3hcDOEs= 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=jM9xGB+F; 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="jM9xGB+F" 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=hLEJlMt6aWjNLe6pMLu/dCCqgGrbqAA/7mCNiug+4io=; b=jM9xGB+FmyBhZ+Yg7cTQ3DgPFS HkXaVIB0koZjKKhcTFsYlgsyXikCe1RX7FcF3WLDnttbwF3ai3sibI/2p45NCSr1Y6l+36rWjXNgY jZRQwk/qkCBXJxykR6RwFmFge3VQzOvd5olzCG9sSUp07TnmqcxQMq7s9z1opGtby6OfCMm89WWEi 0jqfIY2iAz6rjnZPE9qmotBKH9rX3+yzED8fiMVH17uYD/NpMK6jhKrhtVN9b7/yZjuHC0Ph9ydyo JZFdBelepxP9AnabJnnzjwiXax7TBGG7MNy4iHs0pLHRPM+RXKdjWaUvL3pN+qw5IhIHx3xhHYtDK SmJWbXHg==; 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 1tdlAO-001KaL-Pr; Fri, 31 Jan 2025 08:10:23 +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 08/11] sched_ext: Add an event, SCX_EV_BYPASS_DURATION Date: Fri, 31 Jan 2025 16:09:35 +0900 Message-ID: <20250131070938.95551-9-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_DURATION, which represents the total duration of bypass modes in nanoseconds. Signed-off-by: Changwoo Min --- kernel/sched/ext.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index 236cdb0071eb..b4871409bd1c 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 total duration of bypass modes in nanoseconds. + */ + u64 SCX_EV_BYPASS_DURATION; + /* * The number of tasks dispatched in the bypassing mode. */ @@ -1529,6 +1534,12 @@ static DEFINE_PER_CPU(struct scx_event_stats, event_= stats_cpu); } while (0) =20 =20 +/* + * The last time the bypass mode started. + * This is used to measure SCX_EV_BYPASS_DURATION. + */ +static unsigned long scx_bypass_timestamp; + static void scx_bpf_events(struct scx_event_stats *events, size_t events__= sz); =20 static enum scx_ops_enable_state scx_ops_enable_state(void) @@ -4422,12 +4433,15 @@ static void scx_ops_bypass(bool bypass) WARN_ON_ONCE(scx_ops_bypass_depth <=3D 0); if (scx_ops_bypass_depth !=3D 1) goto unlock; + scx_bypass_timestamp =3D ktime_get_ns(); scx_add_event(SCX_EV_BYPASS_ACTIVATE, 1); } else { scx_ops_bypass_depth--; WARN_ON_ONCE(scx_ops_bypass_depth < 0); if (scx_ops_bypass_depth !=3D 0) goto unlock; + scx_add_event(SCX_EV_BYPASS_DURATION, + ktime_get_ns() - scx_bypass_timestamp); } =20 atomic_inc(&scx_ops_breather_depth); @@ -5018,6 +5032,7 @@ 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_DURATION); scx_dump_event(s, &events, SCX_EV_BYPASS_DISPATCH); scx_dump_event(s, &events, SCX_EV_BYPASS_ACTIVATE); =20 @@ -7156,6 +7171,7 @@ __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_DURATION); scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_DISPATCH); scx_agg_event(&e_sys, e_cpu, SCX_EV_BYPASS_ACTIVATE); } --=20 2.48.1