linux-kernel - Re: [PATCH] mm/vmscan.c: avoid recording the original scan targets in shrink

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Message-ID: <20140616235117.GD18790@bbox>
Date:	Tue, 17 Jun 2014 08:51:17 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Chen Yucong <slaoub@...il.com>, mhocko@...e.cz, hannes@...xchg.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmscan.c: avoid recording the original scan targets
 in shrink_lruvec()

On Mon, Jun 16, 2014 at 04:42:37PM -0700, Andrew Morton wrote:
> On Mon, 16 Jun 2014 20:57:54 +0800 Chen Yucong <slaoub@...il.com> wrote:
> 
> > On Mon, 2014-06-09 at 21:27 +0800, Chen Yucong wrote:
> > > Via https://lkml.org/lkml/2013/4/10/334 , we can find that recording the
> > > original scan targets introduces extra 40 bytes on the stack. This patch
> > > is able to avoid this situation and the call to memcpy(). At the same time,
> > > it does not change the relative design idea.
> > > 
> > > ratio = original_nr_file / original_nr_anon;
> > > 
> > > If (nr_file > nr_anon), then ratio = (nr_file - x) / nr_anon.
> > >  x = nr_file - ratio * nr_anon;
> > > 
> > > if (nr_file <= nr_anon), then ratio = nr_file / (nr_anon - x).
> > >  x = nr_anon - nr_file / ratio;
> > > 
> > Hi Andrew Morton,
> > 
> > I think the patch
> >  
> > [PATCH]
> > mm-vmscanc-avoid-recording-the-original-scan-targets-in-shrink_lruvec-fix.patch
> > 
> > which I committed should be discarded.
> 
> OK, thanks.
> 
> I assume you're referring to
> mm-vmscanc-avoid-recording-the-original-scan-targets-in-shrink_lruvec.patch

True.

-- 
Kind regards,
Minchan Kim
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