linux-kernel - Re: [PATCH 2/2] mlock: do not munlock pages in __do

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Message-Id: <20110208104757.bc59f502.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 8 Feb 2011 10:47:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Michel Lespinasse <walken@...gle.com>
Cc:	linux-mm@...ck.org, Lee Schermerhorn <lee.schermerhorn@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mlock: do not munlock pages in __do_fault()

On Mon,  7 Feb 2011 16:47:36 -0800
Michel Lespinasse <walken@...gle.com> wrote:

> If the page is going to be written to, __do_page needs to break COW.
> However, the old page (before breaking COW) was never mapped mapped into
> the current pte (__do_fault is only called when the pte is not present),
> so vmscan can't have marked the old page as PageMlocked due to being
> mapped in __do_fault's VMA. Therefore, __do_fault() does not need to worry
> about clearing PageMlocked() on the old page.
> 
> Signed-off-by: Michel Lespinasse <walken@...gle.com>

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>


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