linux-kernel - Re: tasks-trace RCU: question about grace period forward progress

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Message-ID: <20210225222318.GG4746@worktop.programming.kicks-ass.net>
Date:   Thu, 25 Feb 2021 23:23:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...nel.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        rcu <rcu@...r.kernel.org>, Josh Triplett <josh@...htriplett.org>,
        rostedt <rostedt@...dmis.org>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        "Joel Fernandes, Google" <joel@...lfernandes.org>
Subject: Re: tasks-trace RCU: question about grace period forward progress

On Thu, Feb 25, 2021 at 10:33:21AM -0800, Paul E. McKenney wrote:
> One question for Peter...  Does each and every context switch imply a
> full barrier?

Yes, also see the smp_mb__after_spinlock() in __schedule() :-)