Re: [PATCH v8 2/2] perf evsel: Find process with busy PMUs for EBUSY

[Chun-Tse Shao]

On Tue, Sep 15, 2026 at 11:54 AM Ian Rogers <irogers@xxxxxxxxxx> wrote:
>
> On Mon, Sep 14, 2026 at 1:30 PM Chun-Tse Shao <ctshao@xxxxxxxxxx> wrote:
> >
> > On Sun, Sep 13, 2026 at 6:44 PM Arnaldo Carvalho de Melo
> > <acme@xxxxxxxxxx> wrote:
> > >
> > > On Tue, Jun 09, 2026 at 02:20:43PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > On Tue, Jun 09, 2026 at 08:58:03AM -0700, Ian Rogers wrote:
> > > > > On Tue, Jun 2, 2026 at 11:13 AM Chun-Tse Shao <ctshao@xxxxxxxxxx> wrote:
> > > > > >
> > > > > > It parses fdinfo with PMU type, comparing with the event which failed to
> > > > > > open, and report the processes causing EBUSY error.
> > > > > >
> > > > > > Testing cycles and intel_pt//
> > > > > >
> > > > > >   $ ./perf stat -e cycles &
> > > > > >   [1] 55569
> > > > > >   $ ./perf stat -e intel_pt// &
> > > > > >   [2] 55683
> > > > > >   $ ./perf stat -e intel_pt//
> > > > > >   Error:
> > > > > >   The PMU intel_pt counters are busy and in use by another process.
> > > > > >   Possible processes:
> > > > > >   55683 ./perf stat -e intel_pt//
> > > > > >
> > > > > > Only perf with intel_pt was reported.
> > > > > >
> > > > > > Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
> > > > > > Signed-off-by: Chun-Tse Shao <ctshao@xxxxxxxxxx>
> > > > > > Assisted-by: Gemini:gemini-3.1-pro-preview
> > > > >
> > > > > Arnaldo, as the kernel piece of this landed (thanks Peter!) could we
> > > > > land the tool part too?
> > > >
> > > > Thanks for pointing this out to me, I'll do some housekeeping and
> > > > process this.
> > >
> > > I think this hasn't landed, I tried to find the userland part of v8 but
> > > didn't manage to, can you please point it to me?
> > >
> > > - Arnaldo
> >
> > Hi Arnaldo,
> >
> > Thanks for taking care this. The link to lkml for this userland part
> > is: https://lore.kernel.org/all/20260602181349.3969429-2-ctshao@xxxxxxxxxx/
>
> Hi CT,
>
> Would it be possible to rebase and resend the tool part as a v9? This
> will also trigger the Sashiko review, which would be nice to have.
>
> Thanks,
> Ian

Thank you Ian, please check
lore.kernel.org/20260915204951.2935261-2-ctshao@xxxxxxxxxx for the
rebased v9 patch.


-CT

>
> > The kernel part
> > (https://lore.kernel.org/all/20260602181349.3969429-1-ctshao@xxxxxxxxxx/)
> > was merged by Peter Zijlstra and I can see a tip-bot replied on it.
> >
> > -CT