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From:   Yang Shi <shy828301@gmail.com>
Date:   Mon, 27 Mar 2023 17:53:04 -0700
Message-ID: <CAHbLzkqMZMB7sGLbJk82CpE9cssEU+WZYaXhVTVC-B40bY52jw@mail.gmail.com>
Subject: Re: [BUG] perf: No samples found when using kcore + coresight
To:     Leo Yan <leo.yan@linaro.org>
Cc:     James Clark <james.clark@arm.com>,
        linux-perf-users@vger.kernel.org,
        LAK <linux-arm-kernel@lists.infradead.org>,
        coresight@lists.linaro.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        mathieu.poirier@linaro.org, adrian.hunter@intel.com,
        Jiri Olsa <jolsa@kernel.org>, acme@redhat.com,
        mike.leach@linaro.org, Will Deacon <will@kernel.org>,
        suzuki.poulose@arm.com, yang@os.amperecomputing.com
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Hi Leo,

Just follow up on this one. Any update?

Thanks,
Yang

On Mon, Mar 13, 2023 at 5:36=E2=80=AFPM Leo Yan <leo.yan@linaro.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/@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