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a25262fb16
Merging makes the merged event the leader of the events of the other core PMUs so their histograms can be linked, but the result isn't a real event group. Each event keeps its own file descriptor and has to be enabled and disabled in its own right. __evlist__enable(), __evlist__disable() and evlist__is_enabled() skip anything that isn't a group leader, and the first two then walk the group members of the events they do act on. For a merged set that is backwards: the members are skipped by the leader test, so their file descriptors are never touched, and the walk over the leader's members only updates the bookkeeping in evsel->disabled. Treat an evsel with merged_hybrid_group set as a leader so that it is enabled and disabled in its own right via its own file descriptors. 'perf top' enables and disables by event name. A merged member carries the name of its own PMU rather than the name that was asked for, so also match it against its leader's name, otherwise naming the event toggles only part of the merged set. Signed-off-by: Ian Rogers <irogers@google.com> Assisted-by: Antigravity:gemini-3.1-pro Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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