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

[Lizhi Hou]

On 3/30/26 19:30, Ian Rogers wrote:
> 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?

Do you mean fdinfo? And yes, the fdinfo is in our upstream stack. I will 
post the patch later.

Lizhi

> 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/