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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#c11">Comment # 11</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>Created <span class=""><a href="attachment.cgi?id=128606" name="attach_128606" title="ftrace call graph log for i915_gem_wait_ioctl">attachment 128606</a> <a href="attachment.cgi?id=128606&action=edit" title="ftrace call graph log for i915_gem_wait_ioctl">[details]</a></span>
ftrace call graph log for i915_gem_wait_ioctl

The call log capturing i915_gem_wait_ioctl invokation and overhead.
The time of ioctl itself (20ns) is dwarfed by a slowdown somewhere in
console_unlock() related to printk() calls (650ns)</pre>
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