From: Christoph Lameter <clameter@sgi.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: linux-mm@kvack.org, mel@csn.ul.ie, y-goto@jp.fujitsu.com,
hugh@veritas.com
Subject: Re: memory unplug v4 [2/6] lru isolation race fix
Date: Thu, 7 Jun 2007 22:52:15 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0706072248310.28618@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <20070608143953.93719b3e.kamezawa.hiroyu@jp.fujitsu.com>
On Fri, 8 Jun 2007, KAMEZAWA Hiroyuki wrote:
> release_pages() in mm/swap.c changes page_count() to be 0
> without clearing PageLRU flag...
> This means isolate_lru_page() can see a page, PageLRU() && page_count(page)==0..
> This is BUG. (get_page() will be called against count=0 page.)
Use get_page_unless_zero?
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next prev parent reply other threads:[~2007-06-08 5:52 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-08 5:35 memory unplug v4 intro [0/6] KAMEZAWA Hiroyuki
2007-06-08 5:38 ` memory unplug v4 intro [1/6] migration without mm->sem KAMEZAWA Hiroyuki
2007-06-08 5:47 ` Christoph Lameter
2007-06-08 5:54 ` KAMEZAWA Hiroyuki
2007-06-08 5:57 ` Christoph Lameter
2007-06-08 6:06 ` KAMEZAWA Hiroyuki
2007-06-08 6:44 ` Christoph Lameter
2007-06-08 7:01 ` KAMEZAWA Hiroyuki
2007-06-08 7:21 ` Christoph Lameter
2007-06-08 7:25 ` KAMEZAWA Hiroyuki
2007-06-08 5:39 ` memory unplug v4 [2/6] lru isolation race fix KAMEZAWA Hiroyuki
2007-06-08 5:52 ` Christoph Lameter [this message]
2007-06-08 5:58 ` KAMEZAWA Hiroyuki
2007-06-08 5:58 ` Christoph Lameter
2007-06-08 5:40 ` memory unplug v4 intro [3/6] walk memory resources KAMEZAWA Hiroyuki
2007-06-08 5:41 ` memory unplug v4 intro [4/6] page isolation KAMEZAWA Hiroyuki
2007-06-08 13:24 ` Mel Gorman
2007-06-08 13:59 ` KAMEZAWA Hiroyuki
2007-06-08 5:43 ` memory unplug v4 intro [5/6] page offlining KAMEZAWA Hiroyuki
2007-06-08 5:43 ` memory unplug v4 intro [6/6] ia64 interface KAMEZAWA Hiroyuki
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