Re: [patch v3] swap: virtual swap readahead

Wu Fengguang
2009-06-10T10:00:25Z

On Wed, Jun 10, 2009 at 05:42:56PM +0800, Peter Zijlstra wrote:
> On Wed, 2009-06-10 at 16:56 +0800, Wu Fengguang wrote:
> >
> > Yes it worked! But then I run into page allocation failures:
> >
> > [ 340.639803] Xorg: page allocation failure. order:4, mode:0x40d0
> > [ 340.645744] Pid: 3258, comm: Xorg Not tainted 2.6.30-rc8-mm1 #303
> > [ 340.651839] Call Trace:
> > [ 340.654289] [<ffffffff810c8204>] __alloc_pages_nodemask+0x344/0x6c0
> > [ 340.660645] [<ffffffff810f7489>] __slab_alloc_page+0xb9/0x3b0
> > [ 340.666472] [<ffffffff810f8608>] __kmalloc+0x198/0x250
> > [ 340.671786] [<ffffffffa014bf9f>] ? i915_gem_execbuffer+0x17f/0x11e0 [i915]
> > [ 340.678746] [<ffffffffa014bf9f>] i915_gem_execbuffer+0x17f/0x11e0 [i915]
>
> Jesse Barnes had a patch to add a vmalloc fallback to those largish kms
> allocs.
>
> But order-4 allocs failing isn't really strange, but it might indicate
> this patch fragments stuff sooner, although I've seen these particular
> failues before.

Thanks for the tip. Where is it? I'd like to try it out :)

Despite of the xorg failures, the test was able to complete with the
listed timing. The numbers are the time each program is able to start:

before after
0.02 0.01 N xeyes
0.76 0.68 N firefox
1.88 1.89 N nautilus
3.17 3.25 N nautilus --browser
4.89 4.98 N gthumb
6.47 6.79 N gedit
8.16 8.56 N xpdf /usr/share/doc/shared-mime-info/shared-mime-info-spec.pdf
12.55 12.61 N xterm
14.57 14.99 N mlterm
17.06 17.16 N gnome-terminal
18.90 19.60 N urxvt
23.48 24.26 N gnome-system-monitor
26.52 27.13 N gnome-help
29.65 30.29 N gnome-dictionary
36.12 36.93 N /usr/games/sol
39.27 39.21 N /usr/games/gnometris
42.56 43.61 N /usr/games/gnect
47.03 47.40 N /usr/games/gtali
52.05 51.41 N /usr/games/iagno
55.42 56.21 N /usr/games/gnotravex
61.47 60.58 N /usr/games/mahjongg
67.11 64.68 N /usr/games/gnome-sudoku
75.15 72.42 N /usr/games/glines
79.70 78.61 N /usr/games/glchess
88.48 87.01 N /usr/games/gnomine
96.51 95.03 N /usr/games/gnotski
102.19 100.50 N /usr/games/gnibbles
114.93 108.97 N /usr/games/gnobots2
125.02 120.09 N /usr/games/blackjack
135.11 134.39 N /usr/games/same-gnome
154.50 159.99 N /usr/bin/gnome-window-properties
162.09 176.04 N /usr/bin/gnome-default-applications-properties
173.29 197.12 N /usr/bin/gnome-at-properties
188.21 221.15 N /usr/bin/gnome-typing-monitor
199.93 249.38 N /usr/bin/gnome-at-visual
206.95 272.87 N /usr/bin/gnome-sound-properties
224.49 302.03 N /usr/bin/gnome-at-mobility
234.11 325.73 N /usr/bin/gnome-keybinding-properties
248.59 358.64 N /usr/bin/gnome-about-me
276.27 402.30 N /usr/bin/gnome-display-properties
304.39 439.35 N /usr/bin/gnome-network-preferences
342.01 482.78 N /usr/bin/gnome-mouse-properties
388.58 528.54 N /usr/bin/gnome-appearance-properties
508.47 653.12 N /usr/bin/gnome-control-center
587.57 769.65 N /usr/bin/gnome-keyboard-properties
758.16 1021.65 N : oocalc
830.03 1124.14 N : oodraw
900.03 1246.52 N : ooimpress
993.91 1370.35 N : oomath
1081.89 1478.34 N : ooweb
1161.99 1595.85 N : oowriter

It's slower with the patch. Maybe we shall give it another run with
the vmalloc patch.

Thanks,
Fengguang