From 9fbb4b02302b0ae618303565025412070d32f85e Mon Sep 17 00:00:00 2001 From: Kan Liang Date: Wed, 25 Oct 2023 13:16:26 -0700 Subject: perf tools: Add branch counter knob Add a new branch filter, "counter", for the branch counter option. It is used to mark the events which should be logged in the branch. If it is applied with the -j option, the counters of all the events should be logged in the branch. If the legacy kernel doesn't support the new branch sample type, switching off the branch counter filter. The stored counter values in each branch are displayed right after the regular branch stack information via perf report -D. Usage examples: # perf record -e "{branch-instructions,branch-misses}:S" -j any,counter Only the first event, branch-instructions, collect the LBR. Both branch-instructions and branch-misses are marked as logged events. The occurrences information of them can be found in the branch stack extension space of each branch. # perf record -e "{cpu/branch-instructions,branch_type=any/,cpu/branch-misses,branch_type=counter/}" Only the first event, branch-instructions, collect the LBR. Only the branch-misses event is marked as a logged event. Committer notes: I noticed 'perf test "Sample parsing"' failing, reported to the list and Kan provided a patch that checks if the evsel has a leader and that evsel->evlist is set, the comment in the source code further explains it. Reviewed-by: Ian Rogers Signed-off-by: Kan Liang Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexey Bayduraev Cc: Andi Kleen Cc: Ingo Molnar Cc: Jiri Olsa Cc: Mark Rutland Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Cc: Tinghao Zhang Link: https://lore.kernel.org/r/20231025201626.3000228-8-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/parse-branch-options.c | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/perf/util/parse-branch-options.c') diff --git a/tools/perf/util/parse-branch-options.c b/tools/perf/util/parse-branch-options.c index fd67d204d720..f7f7aff3d85a 100644 --- a/tools/perf/util/parse-branch-options.c +++ b/tools/perf/util/parse-branch-options.c @@ -36,6 +36,7 @@ static const struct branch_mode branch_modes[] = { BRANCH_OPT("stack", PERF_SAMPLE_BRANCH_CALL_STACK), BRANCH_OPT("hw_index", PERF_SAMPLE_BRANCH_HW_INDEX), BRANCH_OPT("priv", PERF_SAMPLE_BRANCH_PRIV_SAVE), + BRANCH_OPT("counter", PERF_SAMPLE_BRANCH_COUNTERS), BRANCH_END }; -- cgit v1.2.3