[PATCH v2] dma-buf: Add DmaBufTotal counter in meminfo

[Daniel Stone]

On Tue, 20 Apr 2021 at 14:46, <Peter.Enderborg at sony.com> wrote:

> On 4/20/21 3:34 PM, Daniel Stone wrote:
> > On Fri, 16 Apr 2021 at 13:34, Peter Enderborg <peter.enderborg at sony.com
> <mailto:peter.enderborg at sony.com>> wrote:
> >     This adds a total used dma-buf memory. Details
> >     can be found in debugfs, however it is not for everyone
> >     and not always available. dma-buf are indirect allocated by
> >     userspace. So with this value we can monitor and detect
> >     userspace applications that have problems.
> >
> >
> > FWIW, this won't work super well for Android where gralloc is
> implemented as a system service, so all graphics usage will instantly be
> accounted to it.
>
> This resource allocation is a big part of why we need it. Why should it
> not work?
>

Sorry, I'd somehow completely misread that as being locally rather than
globally accounted. Given that, it's more correct, just also not super
useful.

Some drivers export allocation tracepoints which you could use if you have
a decent userspace tracing infrastructure. Short of that, many drivers
export this kind of thing through debugfs already. I think a better
long-term direction is probably getting accounting from dma-heaps rather
than extending core dmabuf itself.

Cheers,
Daniel
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