linux-kernel - Re: [PATCH v4 1/2] cgroups: read-write lock CLONE

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Message-ID: <AANLkTi=dhym3c+XJVjoObROcw=mz2Y+a2R5oMdePK3Ng@mail.gmail.com>
Date:	Tue, 3 Aug 2010 21:34:22 -0700
From:	Paul Menage <menage@...gle.com>
To:	Ben Blum <bblum@...rew.cmu.edu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, ebiederm@...ssion.com,
	lizf@...fujitsu.com, matthltc@...ibm.com, oleg@...hat.com
Subject: Re: [PATCH v4 1/2] cgroups: read-write lock CLONE_THREAD forking per 
	threadgroup

On Tue, Aug 3, 2010 at 9:33 PM, Ben Blum <bblum@...rew.cmu.edu> wrote:
>> As far as the #ifdef mess goes, it's true that some people don't have
>> CONFIG_CGROUPS defined. I'd imagine that these are likely to be
>> embedded systems with a fairly small number of processes and threads
>> per process. Are there really any such platforms where the cost of a
>> single extra rwsem per process is going to make a difference either in
>> terms of memory or lock contention? I think you should consider making
>> these additions unconditional.
>
> That's certainly an option, but I think it would be clean enough to put
> static inline functions just under the signal_struct definition.

Either sounds fine to me. I suspect others have a stronger opinion.

Paul
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