From: Adrian Hunter <[email protected]> Document how to select PEBS via Intel PT and how to display synthesized PEBS samples.
Signed-off-by: Adrian Hunter <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kan Liang <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Alexander Shishkin <[email protected]> [ 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 <[email protected]> --- 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
