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<body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
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<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [PNV regression] igt/gem_exec_lut_handle takes more than 10 minutes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87131">bug 87131</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [PNV regression] igt/gem_exec_lut_handle takes more than 10 minutes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87131#c15">Comment # 15</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [PNV regression] igt/gem_exec_lut_handle takes more than 10 minutes"
href="https://bugs.freedesktop.org/show_bug.cgi?id=87131">bug 87131</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>Two major improvements landed:
commit 4ff4b44cbb70c269259958cbcc48d7b8a2cb9ec8
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Jun 16 15:05:16 2017 +0100
drm/i915: Store a direct lookup from object handle to vma
commit 2889caa9232109afc8881f29a2205abeb5709d0c
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date: Fri Jun 16 15:05:19 2017 +0100
drm/i915: Eliminate lots of iterations over the execobjects array
which used to be enough to not only fix the original regression but make a
substantial improvement.
However, since the regression was noticed, I added two more iterations to the
test (to exercise different paths through reloc) and we now interact with
dma-fence and reservation_objects which are a huge step backwards.
Resolving as the original regression is fixed. I've some patches to improve
scalabiltiy of reservation_objects, but the main cost of them are the atomics
we so painstakingly avoided previously (because of this bug highlighting how
expensive they were along this path).</pre>
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