linux-kernel - Re: [PATCH -tip] fix race between stop_two_cpus and stop

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Date:	Fri, 01 Nov 2013 10:27:36 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Mel Gorman <mgorman@...e.de>, mingo@...nel.org, prarit@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] fix race between stop_two_cpus and stop_cpus

On 11/01/2013 10:24 AM, Peter Zijlstra wrote:
> On Fri, Nov 01, 2013 at 01:44:24PM +0000, Mel Gorman wrote:
>> Ok, I see your point now but still wonder if this is too specialised
>> for what we are trying to do.  Could it have been done with a read-write
>> semaphore with the global stop_cpus taking it for write and stop_two_cpus
>> taking it for read?
> 
> rwsem for read is still global state.. That said it should be fairly
> easy to use lglock for this.

I'll rewrite the patch using lglocks, that should make things
more readable.

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