From: Adrian Hunter Date: Tue, 6 Aug 2019 08:46:06 +0000 (+0300) Subject: perf intel-pt: Add brief documentation for PEBS via Intel PT X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=243384dd25c8ea721c5c82a229eaf33cbd1bfd52;p=linux.git perf intel-pt: Add brief documentation for PEBS via Intel PT 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 --- diff --git a/tools/perf/Documentation/intel-pt.txt b/tools/perf/Documentation/intel-pt.txt index 50c5b60101bde..e0d9e7dd4f176 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