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performance hot issues in amdgpu_cs_ib_vm_chunk

Submitted by baopeng

Assigned to Default DRI bug account

Link to original bug (#110481)

Description

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)<br>

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.