linux-kernel - Re: [PATCH] rcu: Report a quiescent state when it's exactly in the state

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Message-ID: <20180511122712.2d67992b@gandalf.local.home>
Date:   Fri, 11 May 2018 12:27:12 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     Byungchul Park <byungchul.park@....com>, jiangshanlai@...il.com,
        josh@...htriplett.org, mathieu.desnoyers@...icios.com,
        linux-kernel@...r.kernel.org, kernel-team@....com,
        peterz@...radead.org
Subject: Re: [PATCH] rcu: Report a quiescent state when it's exactly in the
 state

On Fri, 11 May 2018 12:25:28 -0400
Steven Rostedt <rostedt@...dmis.org> 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