linux-kernel - Re: [PATCH 6/6] Makes procs file writable to move all threads by tgid at once

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Message-Id: <1249572286.32113.527.camel@twins>
Date:	Thu, 06 Aug 2009 17:24:46 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Paul Menage <menage@...gle.com>, Benjamin Blum <bblum@...gle.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Ingo Molnar <mingo@...e.hu>, oleg <oleg@...hat.com>
Subject: Re: [PATCH 6/6] Makes procs file writable to move all threads by
 tgid at once

On Thu, 2009-08-06 at 08:19 -0700, Paul E. McKenney wrote:
> 
> > So yes, putting a rwsem in there sounds fine, you're already bouncing
> > it.
> 
> If the critical section is small, is an rwsem really better than a
> straight mutex?

Well, my understanding was that it needed to surround much, if not all,
of clone(). That's a rather large bit of code.

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