DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D082A61D02
Date: Mon, 3 Jul 2017 09:58:32 +0200
From: Jiri Olsa <jolsa@redhat.com>
To: kan.liang@intel.com
Cc: acme@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com,
        peterz@infradead.org, adrian.hunter@intel.com,
        alexander.shishkin@linux.intel.com, ak@linux.intel.com
Subject: Re: [PATCH V2 2/2] perf tools: always set no branch for dummy event
 in PT
Message-ID: <20170703075832.GA10105@krava>
References: <20170630141656.1626-1-kan.liang@intel.com>
 <20170630141656.1626-2-kan.liang@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20170630141656.1626-2-kan.liang@intel.com>
User-Agent: Mutt/1.8.3 (2017-05-23)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 798
Lines: 27

On Fri, Jun 30, 2017 at 10:16:56AM -0400, kan.liang@intel.com wrote:
> From: Kan Liang <kan.liang@intel.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@intel.com>

for the patchset:

Acked-by: Jiri Olsa <jolsa@kernel.org>

thanks,
jirka