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Date: Fri, 19 Feb 2010 01:42:27 -0800 (PST)
From: David Rientjes <rientjes@google.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
cc: Nick Piggin <npiggin@suse.de>, linux-kernel@vger.kernel.org,
       linux-mm@kvack.org, Miao Xie <miaox@cn.fujitsu.com>,
       Lee Schermerhorn <lee.schermerhorn@hp.com>
Subject: Re: [regression] cpuset,mm: update tasks' mems_allowed in time
 (58568d2)
In-Reply-To: <20100219164754.A1C3.A69D9226@jp.fujitsu.com>
Message-ID: <alpine.DEB.2.00.1002190137530.6293@chino.kir.corp.google.com>
References: <20100218134921.GF9738@laptop> <20100219164754.A1C3.A69D9226@jp.fujitsu.com>
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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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