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bcb89e6320
Add the histogram side of hybrid event merging. When events are merged the entries of the other events are linked to the leader's entries as pairs, and a row is then displayed as the sum over an entry and its pairs. Teach the hpp code to work on that sum: - The formatting and sorting routines add up the value of an entry and of each of its pairs, so a row shows, and is sorted by, the total across the core PMUs rather than the leader's value alone. - Percentages are taken against the summed total_period of the merged hists. Computing each event's share against its own PMU's total would leave the column not adding up to 100%. hist_entry__get_percent_limit_merged() does the same for --percent-limit, which would otherwise compare against the wrong total and filter out the wrong entries. - A header and column width are reserved for the "Total" the merged value is shown under. evlist__merge_hists_hybrid() links the hists together and resorts the result so that it is ordered by the merged total. hists__link() is run once for every event merged into the leader, so an entry can be offered as a pair more than once. hist_entry__add_pair() used list_add_tail() unconditionally, which corrupts the list when the entry is already on one. Return early if the entry is already paired with this one, and use list_move_tail() so that an entry linked elsewhere is moved rather than added a second time. Merging is never combined with --hierarchy, which the merge_entries tests rely on. 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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