linux-kernel - Re: [patch v3] swap: virtual swap readahead

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Date:	Thu, 18 Jun 2009 17:29:47 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.org.uk>,
	Andi Kleen <andi@...stfloor.org>,
	Minchan Kim <minchan.kim@...il.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [patch v3] swap: virtual swap readahead

Johannes,

On Thu, Jun 18, 2009 at 06:41:49AM +0800, Johannes Weiner wrote:
> On Thu, Jun 11, 2009 at 02:31:22PM +0900, KAMEZAWA Hiroyuki wrote:
> > On Tue, 9 Jun 2009 21:01:28 +0200
> > Johannes Weiner <hannes@...xchg.org> wrote:
> > > [resend with lists cc'd, sorry]
> > > 
> > > +static int swap_readahead_ptes(struct mm_struct *mm,

I suspect the previous unfavorable results are due to comparing things
with/without the drm vmalloc patch. So I spent one day redo the whole
comparisons. The swap readahead patch shows neither big improvements
nor big degradations this time.

Base kernel is 2.6.30-rc8-mm1 with drm vmalloc patch.

a) base kernel
b) base kernel + VM_EXEC protection
c) base kernel + VM_EXEC protection + swap readahead

     (a)         (b)         (c)
    0.02        0.02        0.01    N xeyes
    0.78        0.92        0.77    N firefox
    2.03        2.20        1.97    N nautilus
    3.27        3.35        3.39    N nautilus --browser
    5.10        5.28        4.99    N gthumb
    6.74        7.06        6.64    N gedit
    8.70        8.82        8.47    N xpdf /usr/share/doc/shared-mime-info/shared-mime-info-spec.pdf
   11.05       10.95       10.94    N
   13.03       12.72       12.79    N xterm
   15.46       15.09       15.10    N mlterm
   18.05       17.31       17.51    N gnome-terminal
   20.59       19.90       19.98    N urxvt
   23.45       22.82       22.67    N
   25.74       25.16       24.96    N gnome-system-monitor
   28.87       27.53       27.89    N gnome-help
   32.37       31.17       31.89    N gnome-dictionary
   36.60       35.18       35.16    N
   39.76       38.04       37.64    N /usr/games/sol
   43.05       42.17       40.33    N /usr/games/gnometris
   47.70       47.08       43.48    N /usr/games/gnect
   51.64       50.46       47.24    N /usr/games/gtali
   56.26       54.58       50.83    N /usr/games/iagno
   60.36       58.01       55.15    N /usr/games/gnotravex
   65.79       62.92       59.28    N /usr/games/mahjongg
   71.59       67.36       65.95    N /usr/games/gnome-sudoku
   78.57       72.32       72.60    N /usr/games/glines
   84.25       80.03       77.42    N /usr/games/glchess
   90.65       88.11       83.66    N /usr/games/gnomine
   97.75       95.13       89.38    N /usr/games/gnotski
  102.99      101.59       95.05    N /usr/games/gnibbles
  110.68      112.05      109.40    N /usr/games/gnobots2
  117.23      121.58      120.05    N /usr/games/blackjack
  125.15      133.59      130.91    N /usr/games/same-gnome
  134.05      151.99      148.91    N
  142.57      162.67      165.00    N /usr/bin/gnome-window-properties
  156.29      174.54      183.84    N /usr/bin/gnome-default-applications-properties
  168.37      190.38      200.99    N /usr/bin/gnome-at-properties
  184.80      209.41      230.82    N /usr/bin/gnome-typing-monitor
  202.05      226.52      250.02    N /usr/bin/gnome-at-visual
  217.60      243.76      272.91    N /usr/bin/gnome-sound-properties
  239.78      266.47      308.74    N /usr/bin/gnome-at-mobility
  255.23      285.42      338.51    N /usr/bin/gnome-keybinding-properties
  276.85      314.84      374.64    N /usr/bin/gnome-about-me
  308.51      355.95      419.78    N /usr/bin/gnome-display-properties
  341.27      401.22      463.55    N /usr/bin/gnome-network-preferences
  393.42      451.27      517.24    N /usr/bin/gnome-mouse-properties
  438.48      510.54      574.64    N /usr/bin/gnome-appearance-properties
  616.09      671.44      760.49    N /usr/bin/gnome-control-center
  879.69      879.45      918.87    N /usr/bin/gnome-keyboard-properties
 1159.47     1076.29     1071.65    N
 1701.82     1240.47     1280.77    N : oocalc
 1921.14     1446.95     1451.82    N : oodraw
 2262.40     1572.95     1698.37    N : ooimpress
 2703.88     1714.53     1841.89    N : oomath
 3464.54     1864.99     1983.96    N : ooweb
 4040.91     2079.96     2185.53    N : oowriter
 4668.16     2330.24     2365.17    N

 Thanks,
 Fengguang

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