Re: [PATCH v2 1/2] media: usb: pwc: Introduce TRACE_EVENTs for pwc_isoc_handler()

[Steven Rostedt]

On Fri, 22 Jun 2018 15:04:18 +0300
"Matwey V. Kornilov" <matwey@xxxxxxxxxx> 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@xxxxxxxxxx>

>From a tracing point of view:

Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>

-- Steve

> ---
>  drivers/media/usb/pwc/pwc-if.c |  7 +++++
>  include/trace/events/pwc.h     | 64 ++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 71 insertions(+)
>  create mode 100644 include/trace/events/pwc.h
> 
>