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perf evlist: Introduce force_leader() method
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>
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@ -1795,3 +1795,18 @@ bool perf_evlist__exclude_kernel(struct perf_evlist *evlist)
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return true;
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}
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/*
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* Events in data file are not collect in groups, but we still want
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* the group display. Set the artificial group and set the leader's
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* forced_leader flag to notify the display code.
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*/
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void perf_evlist__force_leader(struct perf_evlist *evlist)
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{
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if (!evlist->nr_groups) {
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struct perf_evsel *leader = perf_evlist__first(evlist);
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perf_evlist__set_leader(evlist);
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leader->forced_leader = true;
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}
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}
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@ -309,4 +309,7 @@ struct perf_evsel *perf_evlist__event2evsel(struct perf_evlist *evlist,
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union perf_event *event);
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bool perf_evlist__exclude_kernel(struct perf_evlist *evlist);
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void perf_evlist__force_leader(struct perf_evlist *evlist);
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#endif /* __PERF_EVLIST_H */
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