Received: by 2002:ac0:a594:0:0:0:0:0 with SMTP id m20-v6csp996115imm; Fri, 11 May 2018 09:27:44 -0700 (PDT) X-Google-Smtp-Source: AB8JxZqRIqAAxCs2+uJ/l7eAarPUNuLbt/9uhdH/CzfFIVmI6T572ahahEH2rv1iS0WJb02Ct/p5 X-Received: by 2002:a17:902:d681:: with SMTP id v1-v6mr6100021ply.16.1526056064355; Fri, 11 May 2018 09:27:44 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1526056064; cv=none; d=google.com; s=arc-20160816; b=SdCE/sAJcIuJqUC2XA1uoQXYdzklKN5MIK3Wee8tPM8Sd7uvyRQzdnzp0nhPb+nYpw BNMuUN+CumD4M/Ajl5s1pv5MYyGnxhQYg6zGK1IQ6wpnTmlcu/IcQkh160EVkw6K48Y4 rF9U6wXEiv3lOmGQGnzr6ncMXHoulzlZ3UpSQyR2iNGRva00s1aPrK3i0q7gq+K/G9EK 9JuDHCNr3LelRY5aVE/C71iSEVHrAM1kwnVcq6vGuk5/cOQZOyCG32b652R1H+bc3iJD X68lH6X4l3pvOziHjkQ3aV+o61gqsbFv3bTaXefbLP+yd78xNvFKsw177E4rYNcSbcsi oJHA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :arc-authentication-results; bh=vfeqbQ1rBXRcN+HxhNPvjErVm8hV+yI61cBpPy2nTN8=; b=TNgv4xcS5e6Yp6vgXg6aWWwo0I8e97UZcHQqB00XtK77+NWYOOVWG/xclsYhejja+d NPEPUyUVQ0Xp0a28uS/Vv847eMjDw/oSMYA8qTLEIQ+Oq/qX5gP87CMI8HhdEXu49GSQ hvt/SQxG6EcPbRWKsD7jgFYC5i/BkNp1fi4Wcgr/0eXw8PIwN7i/Pm3gL+r6TkiWK6Q6 dyZvKJoEwQ/ZiFBtUg0wTdi1ttF27SzCpHJdFs75pd50U61z4yhu13jhtX/evFAZtwVC i2n1T4q6dYj6d9DammTTjrayifnbUR2tfEEDunbJxngRkN066PLbxWPD36uHiTE1dLuY K0Hg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id l30-v6si3480295plg.420.2018.05.11.09.27.29; Fri, 11 May 2018 09:27:44 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752070AbeEKQ1P (ORCPT + 99 others); Fri, 11 May 2018 12:27:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:44944 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751756AbeEKQ1O (ORCPT ); Fri, 11 May 2018 12:27:14 -0400 Received: from gandalf.local.home (cpe-66-24-56-78.stny.res.rr.com [66.24.56.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 89D032177F; Fri, 11 May 2018 16:27:13 +0000 (UTC) Date: Fri, 11 May 2018 12:27:12 -0400 From: Steven Rostedt To: "Paul E. McKenney" Cc: Byungchul Park , jiangshanlai@gmail.com, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, linux-kernel@vger.kernel.org, kernel-team@lge.com, peterz@infradead.org Subject: Re: [PATCH] rcu: Report a quiescent state when it's exactly in the state Message-ID: <20180511122712.2d67992b@gandalf.local.home> In-Reply-To: <20180511122528.2a398d24@gandalf.local.home> References: <1526027434-21237-1-git-send-email-byungchul.park@lge.com> <3af4cec0-4019-e3ac-77f9-8631252fb6da@lge.com> <20180511161746.GX26088@linux.vnet.ibm.com> <20180511122321.722a12cc@gandalf.local.home> <20180511122528.2a398d24@gandalf.local.home> X-Mailer: Claws Mail 3.16.0 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 11 May 2018 12:25:28 -0400 Steven Rostedt wrote: > I would also say that one should never call schedule() directly without > changing its state to something other than TASK_RUNNING. Hence, calling > schedule directly is saying you are ready to sleep. But that is not the > case with cond_resched() which should always be called with the state > as TASK_RUNNING. To continue this, with tracing, when a task is scheduled out in the RUNNING state, it is considered preempted, otherwise it is not. -- Steve