linux-kernel - Re: [PATCH] mm: Fix to infinite churning of mlocked page

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Date:	Wed, 19 Aug 2009 20:29:17 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Minchan Kim <minchan.kim@...il.com>
CC:	linux-mm <linux-mm@...ck.org>, lkml <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>
Subject: Re: [PATCH] mm: Fix to infinite churning of mlocked page

Minchan Kim wrote:
> Mlocked page might lost the isolatation race.
> It cause the page to clear PG_mlocked while it remains
> in VM_LOCKED vma. It means it can be put [in]active list.
> We can rescue it by try_to_unmap in shrink_page_list.
> 
> But now, As Wu Fengguang pointed out, vmscan have a bug.
> If the page has PG_referenced, it can't reach try_to_unmap
> in shrink_page_list but put into active list. If the page
> is referenced repeatedly, it can remain [in]active list
> without moving unevictable list.
> 
> This patch can fix it.
> 
> Reported-by: Wu Fengguang <fengguang.wu@...el.com>
> Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> Cc: KOSAKI Motohiro <<kosaki.motohiro@...fujitsu.com>
> Cc: Lee Schermerhorn <lee.schermerhorn@...com>
> Cc: Rik van Riel <riel@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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