Re: [BUG] perf: No samples found when using kcore + coresight

[Yang Shi]

On 3/28/23 1:59 AM, James Clark wrote:
> On 28/03/2023 01:53, Yang Shi wrote:
> > Hi Leo,
> >
> > Just follow up on this one. Any update?
> Hi Yang,
>
> Sorry no update on this yet from me. I was just finishing off
> "coresight: Fix CTI module refcount leak by making it a helper device"
> which I hope to post in the next day or two and then I will start on this.

Hi James,

Thank you for the update.

> James
>
> > Thanks,
> > Yang
> >
> > On Mon, Mar 13, 2023 at 5:36 PM Leo Yan <leo.yan@xxxxxxxxxx> wrote:
> > > On Mon, Mar 13, 2023 at 11:15:44AM -0700, Yang Shi wrote:
> > >
> > > [...]
> > >
> > > > > Just a quick summary, here we have two issues:
> > > > >
> > > > > - With command:
> > > > >    perf record -e cs_etm/@tmc_etf63/k --kcore --per-thread \
> > > > >    -- taskset --cpu-list 1 uname",
> > > > >
> > > > >    perf doesn't enable "text poke" attribution.
> > > > No, it enables "text poke" and perf fails to decode coresight trace
> > > > data too. It doesn't matter whether "--kcore" is after or before "-e
> > > > cs/etm/@tmc_etf63/k".
> > > Understand now.  Thanks for correction, if so we can ignore this one.
> > >
> > > Leo