linux-kernel - Re: [PATCH 1/2] workqueue: Use normal rcu

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Message-ID: <20190322175923.5o6y53yiseo3phif@linutronix.de>
Date:   Fri, 22 Mar 2019 18:59:24 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Tejun Heo <tj@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] workqueue: Use normal rcu

On 2019-03-22 10:43:34 [-0700], Tejun Heo wrote:
> Hello,
Hi,

> We can switch but it doesn't really say why we'd want to.  Can you
> please explain why this is better?

there is this undocumented part. Avoiding the sched RCU means also we
are more preemptible which is good :) Especially on -RT where we can't
disable preemption across the whole critical section.

Is this good enough?

> Thanks.

Sebastian