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Message-Id: <20211113071548.372572-1-irogers@google.com>
Date: Fri, 12 Nov 2021 23:15:47 -0800
From: Ian Rogers <irogers@...gle.com>
To: Andi Kleen <ak@...ux.intel.com>, Jiri Olsa <jolsa@...hat.com>,
Namhyung Kim <namhyung@...nel.org>,
John Garry <john.garry@...wei.com>,
Kajol Jain <kjain@...ux.ibm.com>,
"Paul A . Clarke" <pc@...ibm.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Riccardo Mancini <rickyman7@...il.com>,
Kan Liang <kan.liang@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: eranian@...gle.com, Ian Rogers <irogers@...gle.com>
Subject: [PATCH 1/2] perf evlist: Allow setting arbitrary leader
The leader of a group is the first, but allow it to be an arbitrary
list member so that for Intel topdown events slots may always be the
group leader.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/lib/perf/evlist.c | 15 +++++++++------
tools/lib/perf/include/internal/evlist.h | 2 +-
tools/perf/util/parse-events.c | 2 +-
3 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index e37dfad31383..974da341b8b0 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -643,14 +643,14 @@ perf_evlist__next_mmap(struct perf_evlist *evlist, struct perf_mmap *map,
return overwrite ? evlist->mmap_ovw_first : evlist->mmap_first;
}
-void __perf_evlist__set_leader(struct list_head *list)
+void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader)
{
- struct perf_evsel *evsel, *leader;
+ struct perf_evsel *first, *last, *evsel;
- leader = list_entry(list->next, struct perf_evsel, node);
- evsel = list_entry(list->prev, struct perf_evsel, node);
+ first = list_entry(list->next, struct perf_evsel, node);
+ last = list_entry(list->prev, struct perf_evsel, node);
- leader->nr_members = evsel->idx - leader->idx + 1;
+ leader->nr_members = last->idx - first->idx + 1;
__perf_evlist__for_each_entry(list, evsel)
evsel->leader = leader;
@@ -659,7 +659,10 @@ void __perf_evlist__set_leader(struct list_head *list)
void perf_evlist__set_leader(struct perf_evlist *evlist)
{
if (evlist->nr_entries) {
+ struct perf_evsel *first = list_entry(evlist->entries.next,
+ struct perf_evsel, node);
+
evlist->nr_groups = evlist->nr_entries > 1 ? 1 : 0;
- __perf_evlist__set_leader(&evlist->entries);
+ __perf_evlist__set_leader(&evlist->entries, first);
}
}
diff --git a/tools/lib/perf/include/internal/evlist.h b/tools/lib/perf/include/internal/evlist.h
index f366dbad6a88..6f74269a3ad4 100644
--- a/tools/lib/perf/include/internal/evlist.h
+++ b/tools/lib/perf/include/internal/evlist.h
@@ -127,5 +127,5 @@ int perf_evlist__id_add_fd(struct perf_evlist *evlist,
void perf_evlist__reset_id_hash(struct perf_evlist *evlist);
-void __perf_evlist__set_leader(struct list_head *list);
+void __perf_evlist__set_leader(struct list_head *list, struct perf_evsel *leader);
#endif /* __LIBPERF_INTERNAL_EVLIST_H */
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 5bfb6f892489..6308ba739d19 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1834,8 +1834,8 @@ void parse_events__set_leader(char *name, struct list_head *list,
if (parse_events__set_leader_for_uncore_aliase(name, list, parse_state))
return;
- __perf_evlist__set_leader(list);
leader = list_entry(list->next, struct evsel, core.node);
+ __perf_evlist__set_leader(list, &leader->core);
leader->group_name = name ? strdup(name) : NULL;
}
--
2.34.0.rc1.387.gb447b232ab-goog
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