linux-kernel - Re: [PATCH v2 2/2] nohz: make nohz

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Message-ID: <20150408142641.GG5029@twins.programming.kicks-ass.net>
Date:	Wed, 8 Apr 2015 16:26:41 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Metcalf <cmetcalf@...hip.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] nohz: make nohz_full imply isolcpus

On Wed, Apr 08, 2015 at 10:04:43AM -0400, Chris Metcalf wrote:
> On 04/08/2015 05:41 AM, Peter Zijlstra wrote:
> >On Mon, Apr 06, 2015 at 02:16:45PM -0400, cmetcalf@...hip.com wrote:
> >>From: Chris Metcalf <cmetcalf@...hip.com>
> >>
> >>It's not clear that nohz_full is useful without isolcpus also
> >>set, since otherwise the scheduler has to run periodically to
> >>try to determine whether to steal work from other cores.
> >So the Changelog and the patch don't seem to agree with one another.
> >
> >The Changelog states that nohz_full should depend on isolcpus.
> 
> The git commit message says "make nohz_full imply isolcpus".
> That's consistent with the code.

Well, but then the Changelog doesn't make any sense.
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