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 14:28:26 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>
CC:     "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 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?

Thanks,
Kan