linux-kernel - Re: Problem in Page Cache Replacement

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Date:	Sat, 24 Nov 2012 17:06:09 +0200
From:	Metin Döşlü <metindoslu@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Jaegeuk Hanse <jaegeuk.hanse@...il.com>, Jan Kara <jack@...e.cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: Problem in Page Cache Replacement

On Thu, Nov 22, 2012 at 5:41 PM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> On Wed, Nov 21, 2012 at 12:07:22PM +0200, Metin Döşlü wrote:
>> On Wed, Nov 21, 2012 at 12:00 PM, Jaegeuk Hanse <jaegeuk.hanse@...il.com> wrote:
>> >
>> > On 11/21/2012 05:58 PM, metin d wrote:
>> >
>> > Hi Fengguang,
>> >
>> > I run tests and attached the results. The line below I guess shows the data-1 page caches.
>> >
>> > 0x000000080000006c       6584051    25718  __RU_lA___________________P________    referenced,uptodate,lru,active,private
>> >
>> >
>> > I thinks this is just one state of page cache pages.
>>
>> But why these page caches are in this state as opposed to other page
>> caches. From the results I conclude that:
>>
>> data-1 pages are in state : referenced,uptodate,lru,active,private
>
> I wonder if it's this code that stops data-1 pages from being
> reclaimed:
>
> shrink_page_list():
>
>                 if (page_has_private(page)) {
>                         if (!try_to_release_page(page, sc->gfp_mask))
>                                 goto activate_locked;
>
> What's the filesystem used?

It was ext3.

>> data-2 pages are in state : referenced,uptodate,lru,mappedtodisk
>
> Thanks,
> Fengguang



-- 
Metin Döşlü
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