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authorAdrian Hunter <adrian.hunter@intel.com>2019-08-06 11:46:06 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2019-08-14 10:59:59 -0300
commit243384dd25c8ea721c5c82a229eaf33cbd1bfd52 (patch)
treee901bc6d68fe61c257ee4a1bd1ac15a8407c1ef4 /tools/perf/Documentation
parent1b9921546a9641aefc4a52c1c635b96b67142993 (diff)
downloadlinux-243384dd25c8ea721c5c82a229eaf33cbd1bfd52.tar.bz2
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 <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20190806084606.4021-8-alexander.shishkin@linux.intel.com Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> [ 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 <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
-rw-r--r--tools/perf/Documentation/intel-pt.txt15
1 files changed, 15 insertions, 0 deletions
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