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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] CONFIG_PROVE_LOCKING=y causes igt/gem_exec/basic-wait-all (and possibly others) to fail"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99130#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB] CONFIG_PROVE_LOCKING=y causes igt/gem_exec/basic-wait-all (and possibly others) to fail"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99130">bug 99130</a>
from <span class="vcard"><a class="email" href="mailto:dorota.czaplejewicz@collabora.co.uk" title="Dorota Czaplejewicz <dorota.czaplejewicz@collabora.co.uk>"> <span class="fn">Dorota Czaplejewicz</span></a>
</span></b>
<pre># cat /proc/consoles
tty0 -WU (EC p ) 4:1
Upon further digging, the slow stack *seems* like this (may be wrong, the
tracing tool is less useful with huge numbers of calls):
console_unlock()
call_console_drivers.isra.0.constprop.15()
vt_console_print()
lf()
scrup()
fbcon_scroll()
fbcon_cursor()
fbcon_redraw.isra.17()
Inside of this, the delay is split up among many shorter calls, most time
occupied by fbcon_putcs -> bit_putcs -> cfb_imageblit.</pre>
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