From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen
Cc: kosaki.motohiro@jp.fujitsu.com, Andi Kleen <andi@firstfloor.org>,
       Christoph Lameter <cl@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, Elladan <elladan@eskimo.com>,
       Nick Piggin <npiggin@suse.de>, Johannes Weiner <hannes@cmpxchg.org>,
       Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>,
       "tytso@mit.edu" <tytso@mit.edu>,
       "linux-mm@kvack.org" <linux-mm@kvack.org>,
       "minchan.kim@gmail.com" <minchan.kim@gmail.com>
In-Reply-To: <20090608073944.GA12431@localhost>
References: <87pre4nhqf.fsf@basil.nowhere.org> <20090608073944.GA12431@localhost>
Message-Id: <20090608164611.4385.A69D9226@jp.fujitsu.com>
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Date: Mon,  8 Jun 2009 16:51:53 +0900 (JST)
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> On Wed, May 20, 2009 at 07:20:24PM +0800, Andi Kleen wrote:
> > One scenario that might be useful to test is what happens when some very large
> > processes, all mapped and executable exceed memory and fight each other
> > for the working set. Do you have regressions then compared to without
> > the patches?
> 
> I managed to carry out some stress tests for memory tight desktops.
> The outcome is encouraging: clock time and major faults are reduced
> by 50%, and pswpin numbers are reduced to ~1/3.
> 
> Here is the test scenario.
> - nfsroot gnome desktop with 512M physical memory
> - run some programs, and switch between the existing windows after
>   starting each new program.
> 
> The progress timing (seconds) is:
> 
>   before       after    programs
>     0.02        0.02    N xeyes
>     0.75        0.76    N firefox
>     2.02        1.88    N nautilus
>     3.36        3.17    N nautilus --browser
>     5.26        4.89    N gthumb
>     7.12        6.47    N gedit
>     9.22        8.16    N xpdf /usr/share/doc/shared-mime-info/shared-mime-info-spec.pdf
>    13.58       12.55    N xterm
>    15.87       14.57    N mlterm
>    18.63       17.06    N gnome-terminal
>    21.16       18.90    N urxvt
>    26.24       23.48    N gnome-system-monitor
>    28.72       26.52    N gnome-help
>    32.15       29.65    N gnome-dictionary
>    39.66       36.12    N /usr/games/sol
>    43.16       39.27    N /usr/games/gnometris
>    48.65       42.56    N /usr/games/gnect
>    53.31       47.03    N /usr/games/gtali
>    58.60       52.05    N /usr/games/iagno
>    65.77       55.42    N /usr/games/gnotravex
>    70.76       61.47    N /usr/games/mahjongg
>    76.15       67.11    N /usr/games/gnome-sudoku
>    86.32       75.15    N /usr/games/glines
>    92.21       79.70    N /usr/games/glchess
>   103.79       88.48    N /usr/games/gnomine
>   113.84       96.51    N /usr/games/gnotski
>   124.40      102.19    N /usr/games/gnibbles
>   137.41      114.93    N /usr/games/gnobots2
>   155.53      125.02    N /usr/games/blackjack
>   179.85      135.11    N /usr/games/same-gnome
>   224.49      154.50    N /usr/bin/gnome-window-properties
>   248.44      162.09    N /usr/bin/gnome-default-applications-properties
>   282.62      173.29    N /usr/bin/gnome-at-properties
>   323.72      188.21    N /usr/bin/gnome-typing-monitor
>   363.99      199.93    N /usr/bin/gnome-at-visual
>   394.21      206.95    N /usr/bin/gnome-sound-properties
>   435.14      224.49    N /usr/bin/gnome-at-mobility
>   463.05      234.11    N /usr/bin/gnome-keybinding-properties
>   503.75      248.59    N /usr/bin/gnome-about-me
>   554.00      276.27    N /usr/bin/gnome-display-properties
>   615.48      304.39    N /usr/bin/gnome-network-preferences
>   693.03      342.01    N /usr/bin/gnome-mouse-properties
>   759.90      388.58    N /usr/bin/gnome-appearance-properties
>   937.90      508.47    N /usr/bin/gnome-control-center
>  1109.75      587.57    N /usr/bin/gnome-keyboard-properties
>  1399.05      758.16    N : oocalc
>  1524.64      830.03    N : oodraw
>  1684.31      900.03    N : ooimpress
>  1874.04      993.91    N : oomath
>  2115.12     1081.89    N : ooweb
>  2369.02     1161.99    N : oowriter

Thanks this great effort!
I definitely agree this patch sould be merge to -mm asap.

	Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>


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