Re: [RFC PATCH v3 07/11] drm, cgroup: Add TTM buffer allocation stats

Daniel Vetter
2019-06-27T21:33:17Z

On Thu, Jun 27, 2019 at 04:17:09PM -0400, Kenny Ho wrote:
> On Thu, Jun 27, 2019 at 2:01 AM Daniel Vetter <daniel@ffwll.ch> wrote:
> > btw reminds me: I guess it would be good to have a per-type .total
> > read-only exposed, so that userspace has an idea of how much there is?
> > ttm is trying to be agnostic to the allocator that's used to manage a
> > memory type/resource, so doesn't even know that. But I think something we
> > need to expose to admins, otherwise they can't meaningfully set limits.
>
> I don't think I understand this bit, do you mean total across multiple
> GPU of the same mem type? Or do you mean the total available per GPU
> (or something else?)

Total for a given type on a given cpu. E.g. maybe you want to give 50% of
your vram to one cgroup, and the other 50% to the other cgroup. For that
you need to know how much vram you have. And expecting people to lspci and
then look at wikipedia for how much vram that chip should have (or
something like that) isn't great. Hence 0.vram.total, 0.tt.total, and so
on (also for all the other gpu minors ofc). For system memory we probably
don't want to provide a total, since that's already a value that's easy to
obtain from various sources.
-Daniel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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