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Date:   Tue, 21 Aug 2018 15:49:25 -0400
From:   Steven Rostedt <rostedt@goodmis.org>
To:     "Matwey V. Kornilov" <matwey@sai.msu.ru>
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        matwey.kornilov@gmail.com, tfiga@chromium.org,
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        mchehab@kernel.org, mingo@redhat.com, isely@pobox.com,
        bhumirks@gmail.com, colin.king@canonical.com,
        kieran.bingham@ideasonboard.com, keiichiw@chromium.org
Subject: Re: [PATCH v5 1/2] media: usb: pwc: Introduce TRACE_EVENTs for
 pwc_isoc_handler()
Message-ID: <20180821154925.1951096c@gandalf.local.home>
In-Reply-To: <20180821170629.18408-2-matwey@sai.msu.ru>
References: <20180821170629.18408-1-matwey@sai.msu.ru>
        <20180821170629.18408-2-matwey@sai.msu.ru>
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On Tue, 21 Aug 2018 20:06:28 +0300
"Matwey V. Kornilov" <matwey@sai.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@sai.msu.ru>
> ---
>

From a tracing perspective,

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

-- Steve