From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 505D9C00140 for ; Mon, 8 Aug 2022 11:05:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242859AbiHHLFN (ORCPT ); Mon, 8 Aug 2022 07:05:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48872 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242802AbiHHLE6 (ORCPT ); Mon, 8 Aug 2022 07:04:58 -0400 Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13A7E140FC for ; Mon, 8 Aug 2022 04:04:57 -0700 (PDT) Received: by mail-pg1-x52a.google.com with SMTP id 73so8250898pgb.9 for ; Mon, 08 Aug 2022 04:04:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=zHJHLaCoDzV5QUtZAIutwfB8iOBAVflqU47uK3W3CxI=; b=frlElavzwzibQasm6LTTz+dwYLm/7rqeeNLg0mE9N8JxS4JAEYhTzxo0uKrELF+WKw 7BEevAELdtUIHm0Xky0Bw2JYBA+kR11snSOYCiz4VncyE9W7aGBlRw2P8z8s1sBeNKde SERqentIU6/0Zn0YuMv5jlTA2bvPz9zxhgB94RoAwxf0qr3Ndpnr0fzN8t1VPXX7wrq0 SCJPtJNDDahbjM+oOF4wd1meW2kU/S192uFI594ytliYDDWzCTsxma71FB+4OSu2g87C qJeAIanKsgf1HweklW8pGokQtQ8q878zeCuJwj3ttpS3Z+CgYOC8CCfQyrRLDjIOR0ZN c+xw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=zHJHLaCoDzV5QUtZAIutwfB8iOBAVflqU47uK3W3CxI=; b=B1wKnrqA0/VBUadF5fSEh+liQMp36hyUJGC9hEH/9BVv/B5swVcPo+QrNqNGAgyqQb ha8JhaShSQRw5NHOzh6QhaXihKDtxQ00k7apAt8tpI0o4J7AGrMnP5gS94KgN1LGbexg tlDThAOX73l8X2p7oXSwZPnOTttJCTAPL/7RRXE0ilKj2M3zTWWAbp2HKpx0+8X+NztA fjZ1jBFE1srYZQuZ7jxwCyEhHZbn6M3f8tTunvTbL3TNYMz6NigjgBUOiPNW1+tQ+SoM boXiMfn9YD0Du+kcWcD7TL98XmI/3IT44WG3ADW3Eg5K4P3LPMnTqwClpvgMco3Uzdua Pvyg== X-Gm-Message-State: ACgBeo0YwIWsz9QPFmdAwZjNxzFpBKSDJbUw4rjJmXgqlPzX3sUViRt0 +F2ejl/AZtkMcGBBtsa03LoJjg== X-Google-Smtp-Source: AA6agR6hWWne6ZVloa2WFigujscawmh6Y7gt/eGM5EqEV9V9cEv5bTVEdBbwyLR2UDI42TdcC+aFzA== X-Received: by 2002:aa7:8147:0:b0:52f:3fd9:aced with SMTP id d7-20020aa78147000000b0052f3fd9acedmr4723823pfn.78.1659956696502; Mon, 08 Aug 2022 04:04:56 -0700 (PDT) Received: from C02CV1DAMD6P.bytedance.net ([139.177.225.240]) by smtp.gmail.com with ESMTPSA id o12-20020aa7978c000000b0052dbad1ea2esm8393180pfp.6.2022.08.08.04.04.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Aug 2022 04:04:56 -0700 (PDT) From: Chengming Zhou To: hannes@cmpxchg.org, tj@kernel.org, corbet@lwn.net, surenb@google.com, mingo@redhat.com, peterz@infradead.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com Cc: cgroups@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, songmuchun@bytedance.com, Chengming Zhou Subject: [PATCH v2 05/10] sched/psi: don't create cgroup PSI files when psi_disabled Date: Mon, 8 Aug 2022 19:03:36 +0800 Message-Id: <20220808110341.15799-6-zhouchengming@bytedance.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220808110341.15799-1-zhouchengming@bytedance.com> References: <20220808110341.15799-1-zhouchengming@bytedance.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit 3958e2d0c34e ("cgroup: make per-cgroup pressure stall tracking configurable") make PSI can be configured to skip per-cgroup stall accounting. And doesn't expose PSI files in cgroup hierarchy. This patch do the same thing when psi_disabled. Signed-off-by: Chengming Zhou Acked-by: Johannes Weiner --- kernel/cgroup/cgroup.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 13c8e91d7862..5f88117fc81e 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -3709,6 +3709,9 @@ static void cgroup_pressure_release(struct kernfs_open_file *of) bool cgroup_psi_enabled(void) { + if (static_branch_likely(&psi_disabled)) + return false; + return (cgroup_feature_disable_mask & (1 << OPT_FEATURE_PRESSURE)) == 0; } -- 2.36.1