[Bug 111305] `ttm_bo_handle_move_mem` sometimes takes more than 50 ms - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 111305] `ttm_bo_handle_move_mem` sometimes takes more than 50 ms
Date: Tue, 06 Aug 2019 10:15:16 +0000	[thread overview]
Message-ID: <bug-111305-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=111305

            Bug ID: 111305
           Summary: `ttm_bo_handle_move_mem` sometimes takes more than 50
                    ms
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop.org@molgen.mpg.de

Created attachment 144954
  --> https://bugs.freedesktop.org/attachment.cgi?id=144954&action=edit
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]: https://github.com/intel/pm-graph

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