From: Rik van Riel <riel@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>,
mingo@kernel.org, prarit@redhat.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH -tip] fix race between stop_two_cpus and stop_cpus
Date: Fri, 01 Nov 2013 10:27:36 -0400 [thread overview]
Message-ID: <5273BA58.6010404@redhat.com> (raw)
In-Reply-To: <20131101142404.GG19466@laptop.lan>
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.
--
All rights reversed
next prev parent reply other threads:[~2013-11-01 14:28 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-31 20:31 [PATCH -tip] fix race between stop_two_cpus and stop_cpus Rik van Riel
2013-11-01 11:08 ` Mel Gorman
2013-11-01 11:36 ` Rik van Riel
2013-11-01 12:08 ` Prarit Bhargava
2013-11-01 13:44 ` Mel Gorman
2013-11-01 14:24 ` Peter Zijlstra
2013-11-01 14:27 ` Rik van Riel [this message]
2013-11-01 14:41 ` [PATCH -v2 " Rik van Riel
2013-11-01 14:47 ` Mel Gorman
2013-11-01 14:49 ` Prarit Bhargava
2013-11-01 18:24 ` Prarit Bhargava
2013-11-11 17:52 ` [tip:sched/core] stop_machine: Fix race between stop_two_cpus() and stop_cpus() tip-bot for Rik van Riel
2013-11-01 11:39 ` [PATCH -tip] fix race between stop_two_cpus and stop_cpus Prarit Bhargava
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