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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Excessive CPU load by the xorg-server and GUI's hard lags"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99457#c26">Comment # 26</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Excessive CPU load by the xorg-server and GUI's hard lags"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99457">bug 99457</a>
from <span class="vcard"><a class="email" href="mailto:michel@daenzer.net" title="Michel Dänzer <michel@daenzer.net>"> <span class="fn">Michel Dänzer</span></a>
</span></b>
<pre>Thanks, this helps a little. Unfortunately though, it's still not clear where
drmmode_set_mode_major is getting called from. There are two possibilities for
getting better information about that:
1. Make sure /usr/bin/Xorg and /usr/lib64/xorg/modules/drivers/radeon_drv.so
are compiled with -fno-omit-frame-pointer (after any -O2/-O3 etc. flags), and
get another profile with sysprof.
2. Attach gdb to the Xorg process, and enter the following at the gdb prompt:
b drmmode_set_mode_major
commands 1
bt full
c
end
continue
After that, gdb should start spewing backtraces of where drmmode_set_mode_major
gets called from. You can interrupt it with Ctrl-C after a few seconds, then
attach the backtraces here.</pre>
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