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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - `ttm_bo_handle_move_mem` sometimes takes more than 50 ms"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111305">111305</a>
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<th>Summary</th>
<td>`ttm_bo_handle_move_mem` sometimes takes more than 50 ms
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>XOrg git
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/AMDgpu
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
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<th>Reporter</th>
<td>pmenzel+bugs.freedesktop.org@molgen.mpg.de
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<pre>Created <span class=""><a href="attachment.cgi?id=144954" name="attach_144954" title="Screenshot from callgraph excerpt">attachment 144954</a> <a href="attachment.cgi?id=144954&action=edit" title="Screenshot from callgraph excerpt">[details]</a></span>
Screenshot from callgraph excerpt
With Linux 5.3-rc3 and pm-graph’s `sleepgraph.py` [1] measuring suspend times
on the Dell OptiPlex 5040 with an external AMD graphics card, the driver needs
2.1 seconds to suspend the device, which is too long.
$ lspci -nn -s 01:
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Oland XT [Radeon HD 8670 / R7 250/350] [1002:6610] (rev 81)
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Cape
Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series] [1002:aab0]
Here is the time:
0000:01:00.0 suspend (2170.017 ms @ 5037.143762 to 5039.313779)
Looking into the call graph, 1.4 s are spent in `ttm_bo_evict_mm`.
ttm_bo_evict_mm [ttm] (1438.050 ms @ 5037.601941)
As you can see in the attached screenshot, there are some
`ttm_bo_handle_move_mem` call which take several milliseconds adding up to the
long time.
- ttm_mem_evict_first [ttm] (304.860 ms @ 5037.705809)
_raw_spin_lock
mutex_trylock (0.000 ms @ 5037.705809)
+ ttm_bo_del_from_lru [ttm]
- ttm_bo_evict [ttm] (304.857 ms @ 5037.705810)
amdgpu_evict_flags [amdgpu] (0.000 ms @ 5037.705810)
ttm_bo_mem_space [ttm] (0.001 ms @ 5037.705811)
ttm_bo_handle_move_mem [ttm] (304.853 ms @ 5037.705812)
[1]: <a href="https://github.com/intel/pm-graph">https://github.com/intel/pm-graph</a></pre>
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