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From: Ingo Molnar <mingo@kernel.org>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH] sched/isolation: reconcile rcu_nocbs= and nohz_full=
Date: Thu, 13 May 2021 14:13:28 +0200	[thread overview]
Message-ID: <YJ0X6MciAc36TMJc@gmail.com> (raw)
In-Reply-To: <20210422212448.GJ975577@paulmck-ThinkPad-P17-Gen-1>


* Paul E. McKenney <paulmck@kernel.org> wrote:

> On Mon, Apr 19, 2021 at 12:26:59AM -0400, Paul Gortmaker wrote:
> > We have a mismatch between RCU and isolation -- in relation to what is
> > considered the maximum valid CPU number.
> > 
> > This matters because nohz_full= and rcu_nocbs= are joined at the hip; in
> > fact the former will enforce the latter.  So we don't want a CPU mask to
> > be valid for one and denied for the other.
> > 
> > The difference 1st appeared as of v4.15; further details are below.
> 
> I pulled this into -rcu for testing and further review.
> 
> If it should instead go through some other tree:
> 
> Acked-by: Paul E. McKenney <paulmck@kernel.org>

Thanks - added this fix to tip:sched/core.

Thanks,

	Ingo

  reply	other threads:[~2021-05-13 12:14 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19  4:26 Paul Gortmaker
2021-04-22 21:24 ` Paul E. McKenney
2021-05-13 12:13   ` Ingo Molnar [this message]
2021-05-13 14:22     ` Paul E. McKenney
2021-05-14  6:55       ` Ingo Molnar
2021-05-13 13:17 ` [tip: sched/core] sched/isolation: Reconcile " tip-bot2 for Paul Gortmaker

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