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perf evlist: Introduce force_leader() method

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For non-explicit group (e.g. those created with -e '{eventA,eventB}'),
'perf report' supports a option '--group' which can enable group output.

We also need to support 'perf annotate' with the same '--group'.

Create a new function perf_evlist__force_leader() which contains common
code to force setting the group leader.

Signed-off-by: Jin Yao <yao.jin@linux.intel.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: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1526914666-31839-2-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2018-05-21 22:57:44 +08:00 committed by Arnaldo Carvalho de Melo
parent 2996123e7e
commit e2bdbe80a0
2 changed files with 18 additions and 0 deletions
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15
tools/perf/util/evlist.c
View file

@ -1795,3 +1795,18 @@ bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
return true;
}
/*
* Events in data file are not collect in groups, but we still want
* the group display. Set the artificial group and set the leader's
* forced_leader flag to notify the display code.
*/
void perf_evlist__force_leader(struct perf_evlist *evlist)
{
if (!evlist->nr_groups) {
struct perf_evsel *leader = perf_evlist__first(evlist);
perf_evlist__set_leader(evlist);
leader->forced_leader = true;
}
}

3
tools/perf/util/evlist.h
View file

@ -309,4 +309,7 @@ struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
union perf_event *event);
bool perf_evlist__exclude_kernel(struct perf_evlist *evlist);
void perf_evlist__force_leader(struct perf_evlist *evlist);
#endif /* __PERF_EVLIST_H */