perf top: Support --group-sort-idx to change the sort order
'perf report' supports the option --group-sort-idx, which sorts the
output by the event at the index n in event group.
For example:
perf record -e cycles,instructions,cache-misses
perf report --group --group-sort-idx 2 --stdio
The perf-report output is sorted by cache-misses.
This patch supports --group-sort-idx in perf-top.
For example:
perf top --group -e cycles,instructions,cache-misses --group-sort-idx 2
The perf-top output is sorted by cache-misses.
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20200324220711.6025-1-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index ddab103..487737a 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -53,6 +53,11 @@
--group::
Put the counters into a counter group.
+--group-sort-idx::
+ Sort the output by the event at the index n in group. If n is invalid,
+ sort by the first event. It can support multiple groups with different
+ amount of events. WARNING: This should be used on grouped events.
+
-F <freq>::
--freq=<freq>::
Profile at this frequency. Use 'max' to use the currently maximum
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 02ea2cf..9ff7943 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1560,6 +1560,10 @@ int cmd_top(int argc, const char **argv)
"Record namespaces events"),
OPT_BOOLEAN(0, "all-cgroups", &opts->record_cgroup,
"Record cgroup events"),
+ OPT_INTEGER(0, "group-sort-idx", &symbol_conf.group_sort_idx,
+ "Sort the output by the event at the index n in group. "
+ "If n is invalid, sort by the first event. "
+ "WARNING: should be used on grouped events."),
OPTS_EVSWITCH(&top.evswitch),
OPT_END()
};