From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaldo Carvalho de Melo Subject: [PATCH 23/28] perf intel-pt: Add brief documentation for PEBS via Intel PT Date: Wed, 14 Aug 2019 15:40:46 -0300 Message-ID: <20190814184051.3125-24-acme@kernel.org> References: <20190814184051.3125-1-acme@kernel.org> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190814184051.3125-1-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org To: Ingo Molnar , Thomas Gleixner Cc: Jiri Olsa , Namhyung Kim , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Adrian Hunter , Kan Liang , Peter Zijlstra , Alexander Shishkin , Arnaldo Carvalho de Melo List-Id: linux-perf-users.vger.kernel.org From: Adrian Hunter Document how to select PEBS via Intel PT and how to display synthesized PEBS samples. Signed-off-by: Adrian Hunter Cc: Jiri Olsa Cc: Kan Liang Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20190806084606.4021-8-alexander.shishkin@linux.intel.com Signed-off-by: Alexander Shishkin [ Update the example to use a group with intel_pt// as the group leader, as per Alex comment ] Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/intel-pt.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/perf/Documentation/intel-pt.txt b/tools/perf/Documentation/intel-pt.txt index 50c5b60101bd..e0d9e7dd4f17 100644 --- a/tools/perf/Documentation/intel-pt.txt +++ b/tools/perf/Documentation/intel-pt.txt @@ -919,3 +919,18 @@ amended to take the number of elements as a parameter. Note there is currently no advantage to using Intel PT instead of LBR, but that may change in the future if greater use is made of the data. + + +PEBS via Intel PT +================= + +Some hardware has the feature to redirect PEBS records to the Intel PT trace. +Recording is selected by using the aux-output config term e.g. + + perf record -c 10000 -e '{intel_pt/branch=0/,cycles/aux-output/ppp}' uname + +Note that currently, software only supports redirecting at most one PEBS event. + +To display PEBS events from the Intel PT trace, use the itrace 'o' option e.g. + + perf script --itrace=oe -- 2.21.0