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From: Minchan Kim on 9 Jul 2010 04:30
On Fri, Jul 9, 2010 at 3:52 PM, KOSAKI Motohiro
<kosaki.motohiro(a)jp.fujitsu.com> wrote:
> Rik van Riel pointed out reading reclaim_stat should be protected
> lru_lock, otherwise vmscan might sweep 2x much pages.
>
> This fault was introduced by followint commit.
>
> �commit 4f98a2fee8acdb4ac84545df98cccecfd130f8db
> �Author: Rik van Riel <riel(a)redhat.com>
> �Date: � Sat Oct 18 20:26:32 2008 -0700
>
> � �vmscan: split LRU lists into anon & file sets
>
> � �Split the LRU lists in two, one set for pages that are backed by real file
> � �systems ("file") and one for pages that are backed by memory and swap
> � �("anon"). �The latter includes tmpfs.
>
> � �The advantage of doing this is that the VM will not have to scan over lots
> � �of anonymous pages (which we generally do not want to swap out), just to
> � �find the page cache pages that it should evict.
>
> � �This patch has the infrastructure and a basic policy to balance how much
> � �we scan the anon lists and how much we scan the file lists. �The big
> � �policy changes are in separate patches.
>
> Cc: Rik van Riel <riel(a)redhat.com>
> Cc: Minchan Kim <minchan.kim(a)gmail.com>
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro(a)jp.fujitsu.com>
Reviewed-by: Minchan Kim <minchan.kim(a)gmail.com>

Thanks, Kosaki. I have forgotten this issue.

--
Kind regards,
Minchan Kim
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