linux-kernel - Re: [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split handle vma->vm

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Message-ID: <4FC71496.8050707@gmail.com>
Date:	Thu, 31 May 2012 02:49:58 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Christoph Lameter <cl@...ux.com>
CC:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...gle.com>, Dave Jones <davej@...hat.com>,
	Mel Gorman <mgorman@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	stable@...r.kernel.org, hughd@...gle.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH 1/6] Revert "mm: mempolicy: Let vma_merge and vma_split
 handle vma->vm_policy linkages"

(5/30/12 3:17 PM), Christoph Lameter wrote:
> On Wed, 30 May 2012, kosaki.motohiro@...il.com wrote:
>
>> From: KOSAKI Motohiro<kosaki.motohiro@...il.com>
>>
>> commit 05f144a0d5 removed vma->vm_policy updates code and it is a purpose of
>> mbind_range(). Now, mbind_range() is virtually no-op. no-op function don't
>> makes any bugs, I agree. but maybe it is not right fix.
>
> I dont really understand the changelog. But to restore the policy_vma() is
> the right thing to do since there are potential multiple use cases where
> we want to apply a policy to a vma.
>
> Proposed new changelog:
>
> Commit 05f144a0d5 folded policy_vma() into mbind_range(). There are
> other use cases of policy_vma(*) though and so revert a piece of
> that commit in order to have a policy_vma() function again.

sorry, I overlooked this. Commit 05f144a0d5 don't work neither regular vma
nor shmem vma. thus I can't take this proposal. sorry.
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