linux-kernel - Re: [PATCH 1/4] cpuset: convert callback

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Message-ID: <alpine.DEB.2.11.1409261039410.3870@gentwo.org>
Date:	Fri, 26 Sep 2014 10:44:47 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
cc:	linux-kernel@...r.kernel.org, Li Zefan <lizefan@...wei.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Subject: Re: [PATCH 1/4] cpuset: convert callback_mutex to a spinlock

On Fri, 26 Sep 2014, Vladimir Davydov wrote:

> The callback_mutex is only used to synchronize reads/updates of cpusets'
> flags and cpu/node masks. These operations should always proceed fast so
> there's no reason why we can't use a spinlock instead of the mutex.

Checked that and given the other restrictions already on the use of
callback_mutex this is to be expected.

Acked-by: Christoph Lameter <cl@...ux.com>

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