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

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Message-ID: <alpine.DEB.2.00.1002190137530.6293@chino.kir.corp.google.com>
Date:	Fri, 19 Feb 2010 01:42:27 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Nick Piggin <npiggin@...e.de>, 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 Fri, 19 Feb 2010, KOSAKI Motohiro wrote:

> Personally, I like just revert at once than bandaid. 58568d2 didn't
> introduce any new feature, then we can revet it without abi breakage.
> 

Revert a commit from more than six months ago when the fix is probably a 
small patch in cpuset_attach()?  I think we can do better than that.

This may not have introduced a new feature, but it was a worthwhile change 
to avoid the old cpuset_update_task_memory_state() hooks in mempolicy, 
page allocator, etc. code that could block on callback_mutex for iterating 
the hierarchy.
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