Re: [PATCH v5 1/2] media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler()
From: Steven Rostedt
Date: Tue Aug 21 2018 - 15:59:41 EST
On Tue, 21 Aug 2018 20:06:28 +0300
"Matwey V. Kornilov" <matwey@xxxxxxxxxx> wrote:
> There were reports that PWC-based webcams don't work at some
> embedded ARM platforms.  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.
>  https://www.spinics.net/lists/linux-usb/msg165735.html
> Signed-off-by: Matwey V. Kornilov <matwey@xxxxxxxxxx>
>From a tracing perspective,
Reviewed-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>