linux-kernel - Re: [PATCH tip/core/rcu 10/10] rcu: Account for rcu_all_qs() in cond

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Date:   Sat, 2 Dec 2017 14:55:02 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com
Subject: Re: [PATCH tip/core/rcu 10/10] rcu: Account for rcu_all_qs() in
 cond_resched()

On Sat, Dec 02, 2017 at 04:22:20AM -0800, Paul E. McKenney wrote:
> Because there are a few key places within RCU and rcutorture that need it.
> Without it, there are scenarios where the new cond_resched() never gets
> activated, and thus doesn't take effect.

Ah, I missed that interaction.

> The key point is that with this series in place, it should not be necessary
> to use cond_resched_rcu_qs() outside of kernel/rcu and kernel/torture.c.
> Which is a valuable step forward, right?

Quite.