linux-kernel - Re: [RESEND v2] tracing/gpu: Add imported size to gpu_mem

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Message-ID: <CAC_TJvdv+BSQh0vqWmA220op+b5=8=ZYrhXcmDRE-Fppo0zE0w@mail.gmail.com>
Date:   Fri, 3 Sep 2021 15:36:03 -0700
From:   Kalesh Singh <kaleshsingh@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Suren Baghdasaryan <surenb@...gle.com>,
        Hridya Valsaraju <hridya@...gle.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        John Reitan <john.reitan@....com>,
        Ørjan Eide <orjan.eide@....com>,
        Mark Underwood <mark.underwood@....com>,
        Gary Sweet <gary.sweet@...adcom.com>,
        Stephen Mansfield <stephen.mansfield@...tec.com>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND v2] tracing/gpu: Add imported size to gpu_mem_imported tracepoint

On Fri, Sep 3, 2021 at 1:30 PM Steven Rostedt <rostedt@...dmis.org> wrote:
>
> On Tue, 31 Aug 2021 17:02:29 +0000
> Kalesh Singh <kaleshsingh@...gle.com> wrote:
>
> > The existing gpu_mem_total tracepoint provides GPU drivers a uniform way
> > to report the per-process and system-wide GPU memory usage. This
> > tracepoint reports a single total of the GPU private allocations and the
> > imported memory. [1]
> >
> > To allow distinguishing GPU private vs imported memory, add an
> > imported_size field to the gpu_mem_total tracepoint. GPU drivers can use
> > this new field to report the per-process and global GPU-imported memory
> > in a uniform way.
> >
> > User space tools can detect and handle the old vs new gpu_mem_total
> > format via the gpu_mem/gpu_mem_total/format file.
> >
> > [1] https://lore.kernel.org/r/20200302234840.57188-1-zzyiwei@google.com/
> >
> > Signed-off-by: Kalesh Singh <kaleshsingh@...gle.com>
> > ---
> >  include/trace/events/gpu_mem.h | 17 +++++++++++------
> >  1 file changed, 11 insertions(+), 6 deletions(-)
> >
>
> This is that trace event that doesn't have any in tree callers, right? I
> thought there was going to be some soon.

The trace event is currently used by the Android GPU drivers, and
there is some work ongoing to add this in drm core upstream but it's
not yet ready.

>
> For the updates to the tracing side (besides not having any users), it
> looks trivial to me.
>
> Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
>
> But this needs to be pulled in by one of the GPU maintainers.

Thanks for the review Steve. I'll resend adding the GPU maintainers.

>
> -- Steve