Re: [PATCH 1/2] Documentation: tracing: Documentation for ultrasoc SMB drivers

[liuqi (BA)]

Hi Mathieu,

On 2021/9/7 1:34, Mathieu Poirier wrote:
> On Mon, Jul 19, 2021 at 07:17:36PM +0800, Qi Liu wrote:
> > Ultrasoc trace module is a system level solution for tracing, and SMB
> > is the component in trace module to store trace message. This patch
> > brings in a documentation for ultrasoc SMB driver and simple introduces
> > how to use ultrasoc SMB by sysfs interface and perf interface.
> >
> > Signed-off-by: Qi Liu <liuqi115@xxxxxxxxxx>

> > +Example usage of perf::
> > +
> > +	 $# ./perf list pmu
> > +	 cs_etm//                                    [Kernel PMU event]
> > +    $# ./perf record -e cs_etm/@sink_smb0/ -C 0 --per-thread sleep 2s
> > +    [ perf record: Woken up 2 times to write data ]
> > +    [ perf record: Captured and wrote 0.288 MB perf.data ]
> > +    $# ./perf report
>
> This IP block works like any other sink device and as such I don't really see a
> need for this documentation - especially since it is mostly conveying the same
> information already present in coresight.rst.

Yes, smb works as a sink device.
got it, I'll drop this documentation next time.

Thanks,
Qi

> Thanks,
> Mathieu
> >> --
> > 2.17.1
> .