linux-kernel - Re: [PATCH] mm: optimize replace_page_cache

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Date:	Thu, 24 Feb 2011 11:56:55 +0100
From:	Miklos Szeredi <mszeredi@...e.cz>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: [PATCH] mm: optimize replace_page_cache_page

On Thu, 2011-02-24 at 08:37 +0900, Minchan Kim wrote:
> On Thu, Feb 24, 2011 at 7:44 AM, Andrew Morton
> <akpm@...ux-foundation.org> wrote:
> > On Sun, 20 Feb 2011 08:41:21 +0900
> > Minchan Kim <minchan.kim@...il.com> wrote:
> >
> >> Resend.
> >
> > Reignore.
> >
> >> he patch is based on mmotm-2011-02-04 +
> >> mm-add-replace_page_cache_page-function-add-freepage-hook.patch.
> >>
> >> On Fri, Feb 11, 2011 at 01:33:46AM +0900, Minchan Kim wrote:
> >> > This patch optmizes replace_page_cache_page.
> >> >
> >> > 1) remove radix_tree_preload
> >> > 2) single radix_tree_lookup_slot and replace radix tree slot
> >> > 3) page accounting optimization if both pages are in same zone.
> >> >
> >> > Cc: Miklos Szeredi <mszeredi@...e.cz>
> >> > Cc: Rik van Riel <riel@...hat.com>
> >> > Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> >> > Cc: Mel Gorman <mel@....ul.ie>
> >> > Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> >> > ---
> >> >  mm/filemap.c |   61 ++++++++++++++++++++++++++++++++++++++++++++++++---------
> >> >  1 files changed, 51 insertions(+), 10 deletions(-)
> >> >
> >> > Hi Miklos,
> >> > This patch is totally not tested.
> >> > Could you test this patch?
> >
> > ^^^ Because of this.
> >
> > Is it tested yet?
> >
> 
> Miklos. Could you test this?
> If you are busy, let me know how to test it. I will.
> Thanks.

Grab git version of libfuse and do something like this:

 fuse/example/fusexmp_fh -obig_writes /mnt/fuse/
 dd if=/tmp/random0 of=/mnt/fuse/tmp/random1 bs=1M
 md5sum /tmp/radom0 /tmp/random1

This should exercise the page moving.

I'll review and test the patch when I have some time.

Thanks,
Miklos

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