Re: [PATCH V1] accel/amdxdna: Add per-process BO memory usage query support

[Ian Rogers]

On Wed, Mar 25, 2026 at 11:47 AM Lizhi Hou <lizhi.hou@xxxxxxx> wrote:
>
> Applied to drm-misc-next.
>
> On 3/24/26 10:01, Mario Limonciello wrote:
> >
> >
> > On 3/24/26 11:31, Lizhi Hou wrote:
> >> From: Max Zhen <max.zhen@xxxxxxx>
> >>
> >> Add support for querying per-process buffer object (BO) memory
> >> usage through the amdxdna GET_ARRAY UAPI.
> >>
> >> Introduce a new query type, DRM_AMDXDNA_BO_USAGE, along with
> >> struct amdxdna_drm_bo_usage to report BO memory usage statistics,
> >> including heap, total, and internal usage.
> >>
> >> Track BO memory usage on a per-client basis by maintaining counters
> >> in GEM open/close and heap allocation/free paths. This ensures the
> >> reported statistics reflect the current memory footprint of each
> >> process.
> >>
> >> Wire the new query into the GET_ARRAY implementation to expose
> >> the usage information to userspace.
> >>
> >> Signed-off-by: Max Zhen <max.zhen@xxxxxxx>
> >> Reviewed-by: Lizhi Hou <lizhi.hou@xxxxxxx>
> >> Signed-off-by: Lizhi Hou <lizhi.hou@xxxxxxx>
> > I'm assuming you also have userspace side ready for this too right?
> > If you have a link handy can you please include it when committing.

Sorry for a naive question, would support in procfs be possible?
There's support in perf for displaying DRM usage stat data from there
[1], for example:
```
$ perf list drm-

List of pre-defined events (to be used in -e or -M):


drm:
 drm-active-stolen-system0
      [Total memory active in one or more engines. Unit: drm_i915]
 drm-active-system0
      [Total memory active in one or more engines. Unit: drm_i915]
 drm-engine-capacity-video
      [Engine capacity. Unit: drm_i915]
 drm-engine-copy
      [Utilization in ns. Unit: drm_i915]
 drm-engine-render
      [Utilization in ns. Unit: drm_i915]
 drm-engine-video
      [Utilization in ns. Unit: drm_i915]
 drm-engine-video-enhance
      [Utilization in ns. Unit: drm_i915]
 drm-purgeable-stolen-system0
      [Size of resident and purgeable memory buffers. Unit: drm_i915]
 drm-purgeable-system0
      [Size of resident and purgeable memory buffers. Unit: drm_i915]
 drm-resident-stolen-system0
      [Size of resident memory buffers. Unit: drm_i915]
 drm-resident-system0
      [Size of resident memory buffers. Unit: drm_i915]
 drm-shared-stolen-system0
      [Size of shared memory buffers. Unit: drm_i915]
 drm-shared-system0
      [Size of shared memory buffers. Unit: drm_i915]
 drm-total-stolen-system0
      [Size of shared and private memory. Unit: drm_i915]
 drm-total-system0
      [Size of shared and private memory. Unit: drm_i915]


$ perf stat -e drm-engine-render -a sleep 1

Performance counter stats for 'system wide':

  557,542,732,344 ns   drm-engine-render

      1.001575975 seconds time elapsed
```

Thanks,
Ian

[1] https://lore.kernel.org/lkml/20250403202439.57791-1-irogers@xxxxxxxxxx/