Re: [PATCH 2/3] vmscan: make mapped executable pages the firstclass citizen
From: Wu Fengguang
Date: Mon Jun 08 2009 - 03:56:51 EST
On Mon, Jun 08, 2009 at 03:51:53PM +0800, KOSAKI Motohiro wrote:
> > 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@xxxxxxxxxxxxxx>
Thank you :)
To be complete, here are the free numbers at the end of the tests:
before patch:
total used free shared buffers cached
Mem: 474 467 7 0 0 236
-/+ buffers/cache: 230 243
Swap: 1023 418 605
after patch
total used free shared buffers cached
Mem: 474 457 16 0 0 236
-/+ buffers/cache: 221 253
Swap: 1023 404 619
Thanks,
Fengguang
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