linux-kernel - Re: Problem in Page Cache Replacement

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Message-ID: <20121122154107.GB11736@localhost>
Date:	Thu, 22 Nov 2012 23:41:07 +0800
From:	Fengguang Wu <fengguang.wu@...el.com>
To:	Metin Döşlü <metindoslu@...il.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 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?

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

Thanks,
Fengguang
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