Slow exaOffscreenAlloc ?
Zdenek Kabelac
zdenek.kabelac at gmail.com
Mon Dec 8 03:32:39 PST 2008
Hi
Recently I've noticed that scrolling in firefox is getting very very
slow on some pages - especially those with some static background on
the sides of pages. So I've started oprofile - and to my surprise the
most of the time has been spent in two Xorg libexa functions:
Of course I could be completely wrong in my interpretation of these
oprofile results - from the fast look into the exa/exa_offscreen.c
it seems like a major time is spent in some loop going through
possible quite large list of offScreenAreas?
I'm running the latest fedora rawhide xorg-x11-server-Xorg-1.5.3-5.fc10.x86_64
X.Org X Server 1.5.3
Release Date: 5 November 2008
and linus-git kernel tree 2.6.28-rc7
Any ideas, solution ?
Zdenek
CPU: Core 2, speed 2200 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a
unit mask of 0x00 (Unhalted core cycles) count 100000
samples % image name app name symbol name
-------------------------------------------------------------------------------
35766 26.1526 libexa.so Xorg exaOffscreenAlloc
35766 100.000 libexa.so Xorg exaOffscreenAlloc [self]
-------------------------------------------------------------------------------
32389 23.6833 libexa.so Xorg exaOffscreenFree
32389 100.000 libexa.so Xorg exaOffscreenFree [self]
-------------------------------------------------------------------------------
13126 9.5979 libpixman-1.so.0.12.0 Xorg pixman_region_subtractO
13126 100.000 libpixman-1.so.0.12.0 Xorg pixman_region_subtractO [self]
-------------------------------------------------------------------------------
6704 4.9021 libpixman-1.so.0.12.0 Xorg pixman_op
6704 100.000 libpixman-1.so.0.12.0 Xorg pixman_op [self]
-------------------------------------------------------------------------------
2 0.5435 intel_drv.so Xorg _fini
133 36.1413 libexa.so Xorg _fini
233 63.3152 libfb.so Xorg fbCreateGC
6229 4.5547 Xorg Xorg
dixLookupPrivate
6229 100.000 Xorg Xorg
dixLookupPrivate [self]
-------------------------------------------------------------------------------
909 0.6647 libmozjs.so firefox JS_CallTracer
909 100.000 libmozjs.so firefox JS_CallTracer [self]
-------------------------------------------------------------------------------
650 100.000 libc-2.9.so oprofiled __libc_start_main
792 0.5791 oprofiled oprofiled
/usr/bin/oprofiled
792 100.000 oprofiled oprofiled
/usr/bin/oprofiled [self]
-------------------------------------------------------------------------------
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