Arnaldo Carvalho de Melo <a...@redhat.com> writes: > Em Tue, Aug 06, 2019 at 11:46:06AM +0300, Alexander Shishkin escreveu: >> From: Adrian Hunter <adrian.hun...@intel.com> >> >> Document how to select PEBS via Intel PT and how to display synthesized >> PEBS samples. >> >> Signed-off-by: Adrian Hunter <adrian.hun...@intel.com> >> Signed-off-by: Alexander Shishkin <alexander.shish...@linux.intel.com> >> --- >> 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..8dc513b6607b 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 cycles/aux-output/ppp -e intel_pt/branch=0/ >> uname >> + >> +Note that currently, software only supports redirecting at most one PEBS >> event. > > So, with these patches, but not the kernel ones I end up getting: > > [root@quaco ~]# perf record -c 10000 -e cycles/aux-output/ppp -e > intel_pt/branch=0/ uname
FWIW, the correct command line for that would have the two events grouped and intel_pt be the group leader. Regards, -- Alex
