linux-kernel - Re: [PATCH 2/2] dmabuf/tracing: Add dma-buf trace events

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Message-ID: <CAJuCfpGot1Lr+eS_AU30gqrrjc0aFWikxySe0667_GTJNsGTMw@mail.gmail.com>
Date:   Mon, 3 Aug 2020 09:22:53 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Kalesh Singh <kaleshsingh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, linux-doc@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-media@...r.kernel.org,
        DRI mailing list <dri-devel@...ts.freedesktop.org>,
        linaro-mm-sig@...ts.linaro.org, linux-fsdevel@...r.kernel.org,
        Hridya Valsaraju <hridya@...gle.com>,
        Ioannis Ilkos <ilkos@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        kernel-team <kernel-team@...roid.com>
Subject: Re: [PATCH 2/2] dmabuf/tracing: Add dma-buf trace events

On Mon, Aug 3, 2020 at 9:12 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Mon, Aug 03, 2020 at 09:00:00AM -0700, Suren Baghdasaryan wrote:
> > On Mon, Aug 3, 2020 at 8:41 AM Matthew Wilcox <willy@...radead.org> wrote:
> > >
> > > On Mon, Aug 03, 2020 at 02:47:19PM +0000, Kalesh Singh wrote:
> > > > +static void dma_buf_fd_install(int fd, struct file *filp)
> > > > +{
> > > > +     trace_dma_buf_fd_ref_inc(current, filp);
> > > > +}
> > >
> > > You're adding a new file_operation in order to just add a new tracepoint?
> > > NACK.
> >
> > Hi Matthew,
> > The plan is to attach a BPF to this tracepoint in order to track
> > dma-buf users. If you feel this is an overkill, what would you suggest
> > as an alternative?
>
> I'm sure BPF can attach to fd_install and filter on file->f_ops belonging
> to dma_buf, for example.

Sounds like a workable solution. Will explore that direction. Thanks Matthew!