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

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Date:	Thu, 18 Jun 2009 15:09:34 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
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

On Thu, Jun 18, 2009 at 05:29:47PM +0800, Wu Fengguang wrote:
> 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.

Thanks again!  Nice.  So according to this, vswapra doesn't increase
other IO latency (much) but boosts ongoing swap loads (quite some) (as
qsbench showed).  Is that a result or what! :)

I will see how the tests described in the other mail work out.

> 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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