[Bug 110481] performance hot issues in amdgpu_cs_ib_vm_chunk

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110481

            Bug ID: 110481
           Summary: performance hot issues in amdgpu_cs_ib_vm_chunk
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: baopeng88_com at 163.com

We have encountered performance hot issues in vce module. Cpu occupancy rate
has been in the alloc_vmap_area function.
We found that calling the alloc_vmap_area function mainly occurs in the
amdgpu_cs_ib_vm_chunk function. So we removed the main loop judgment logic of
amdgpu_cs_ib_vm_chunk.
as follows .
-       if (p->ring->funcs->parse_cs || p->ring->funcs->patch_cs_in_place) {
+       if (0)
If we don't delete, vce will be very slow.

Is this the fundamental way to solve the problem? Or there are other ways to
solve the problem？

3q very much.

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