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

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Date:   Mon, 27 Mar 2023 17:53:04 -0700
From:   Yang Shi <shy828301@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        coresight@...ts.linaro.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        mathieu.poirier@...aro.org, adrian.hunter@...el.com,
        Jiri Olsa <jolsa@...nel.org>, acme@...hat.com,
        mike.leach@...aro.org, Will Deacon <will@...nel.org>,
        suzuki.poulose@....com, yang@...amperecomputing.com
Subject: Re: [BUG] perf: No samples found when using kcore + coresight

Hi Leo,

Just follow up on this one. Any update?

Thanks,
Yang

On Mon, Mar 13, 2023 at 5:36 PM Leo Yan <leo.yan@...aro.org> 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/@..._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/@..._etf63/k".
>
> Understand now.  Thanks for correction, if so we can ignore this one.
>
> Leo