linux-kernel - Re: [PATCH v5 1/2] media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc

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Date:   Tue, 21 Aug 2018 15:49:25 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Matwey V. Kornilov" <matwey@....msu.ru>
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        matwey.kornilov@...il.com, tfiga@...omium.org,
        laurent.pinchart@...asonboard.com, stern@...land.harvard.edu,
        ezequiel@...labora.com, hdegoede@...hat.com, hverkuil@...all.nl,
        mchehab@...nel.org, mingo@...hat.com, isely@...ox.com,
        bhumirks@...il.com, colin.king@...onical.com,
        kieran.bingham@...asonboard.com, keiichiw@...omium.org
Subject: Re: [PATCH v5 1/2] media: usb: pwc: Introduce TRACE_EVENTs for
 pwc_isoc_handler()

On Tue, 21 Aug 2018 20:06:28 +0300
"Matwey V. Kornilov" <matwey@....msu.ru> wrote:

> There were reports that PWC-based webcams don't work at some
> embedded ARM platforms. [1] Isochronous transfer handler seems to
> work too long leading to the issues in MUSB USB host subsystem.
> Also note, that urb->giveback() handlers are still called with
> disabled interrupts. In order to be able to measure performance of
> PWC driver, traces are introduced in URB handler section.
> 
> [1] https://www.spinics.net/lists/linux-usb/msg165735.html
> 
> Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
> ---
>

>From a tracing perspective,

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve