linux-kernel - Re: [regression] cpuset,mm: update tasks' mems

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Message-ID: <alpine.DEB.2.00.1002221400060.23881@chino.kir.corp.google.com>
Date:	Mon, 22 Feb 2010 14:00:52 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Nick Piggin <npiggin@...e.de>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Miao Xie <miaox@...fujitsu.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [regression] cpuset,mm: update tasks' mems_allowed in time
 (58568d2)

On Mon, 22 Feb 2010, Nick Piggin wrote:

> If you have a concurrent reader without any synchronisation, then what
> stops it from loading a word of the mask before stores to add the new
> nodes and then loading another word of the mask after the stores to
> remove the old nodes? (which can give an empty mask).
> 

Currently nothing, so we'll need a variant for configurations where the 
size of nodemask_t is larger than we can atomically store.
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