linux-kernel - Re: [PATCH V2 2/2] perf tools: always set no branch for dummy event in PT

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Date:   Wed, 19 Jul 2017 11:35:14 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Liang, Kan" <kan.liang@...el.com>
Cc:     Jiri Olsa <jolsa@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH V2 2/2] perf tools: always set no branch for dummy event
 in PT

Em Wed, Jul 19, 2017 at 02:28:26PM +0000, Liang, Kan escreveu:
> 
> 
> > Em Mon, Jul 03, 2017 at 09:58:32AM +0200, Jiri Olsa escreveu:
> > > On Fri, Jun 30, 2017 at 10:16:56AM -0400, kan.liang@...el.com wrote:
> > > > From: Kan Liang <kan.liang@...el.com>
> > > >
> > > > An earlier kernel patch allowed enabling PT and LBR at the same time
> > > > on Goldmont.
> > > >
> > > > commit ccbebba4c6bf ("perf/x86/intel/pt: Bypass PT vs. LBR
> > > > exclusivity if the core supports it")
> > > >
> > > > However, users still cannot use Intel PT and LBRs simultaneously.
> > > >  $ sudo perf record -e cycles,intel_pt//u -b  -- sleep 1
> > > >  Error:
> > > >  PMU Hardware doesn't support sampling/overflow-interrupts.
> > > >
> > > > PT implicitly adds dummy event in perf tool. dummy event is software
> > > > event which doesn't support LBR.
> > > >
> > > > Always setting no branch for dummy event in Intel PT.
> > > >
> > > > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > >
> > > for the patchset:
> > >
> > > Acked-by: Jiri Olsa <jolsa@...nel.org>
> > 
> > Thanks, applied.
> > 
> 
> Hi Arnaldo,
> 
> The patch series looks miss the latest update.
> Could you please have a look?

Will, check, thanks for verifying.

- Arnaldo