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author | Jin Yao <yao.jin@linux.intel.com> | 2021-07-07 13:56:52 +0800 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-07-14 10:05:35 -0300 |
commit | e0a7ef2a62e4f61a751bccfc79b9e7acb51474de (patch) | |
tree | 360142292fb7cf2ae56cc7c745fbd2ec1b6d2449 | |
parent | de3d5fd83c9b1099b0d207b41a222dc451184a63 (diff) | |
download | linux-e0a7ef2a62e4f61a751bccfc79b9e7acb51474de.tar.gz |
perf stat: Merge uncore events by default for hybrid platform
On a hybrid platform, by default 'perf stat' aggregates and reports the event counts per PMU. For example, # perf stat -e cycles -a true Performance counter stats for 'system wide': 1,400,445 cpu_core/cycles/ 680,881 cpu_atom/cycles/ 0.001770773 seconds time elapsed But for uncore events that's not a suitable method. Uncore has nothing to do with hybrid. So for uncore events, we aggregate event counts from all PMUs and report the counts without PMUs. Before: # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ -a true Performance counter stats for 'system wide': 2,058 uncore_arb_0/event=0x81,umask=0x1/ 2,028 uncore_arb_1/event=0x81,umask=0x1/ 0 uncore_arb_0/event=0x84,umask=0x1/ 0 uncore_arb_1/event=0x84,umask=0x1/ 0.000614498 seconds time elapsed After: # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ -a true Performance counter stats for 'system wide': 3,996 arb/event=0x81,umask=0x1/ 0 arb/event=0x84,umask=0x1/ 0.000630046 seconds time elapsed Of course, we also keep the '--no-merge' working for uncore events. # perf stat -e arb/event=0x81,umask=0x1/,arb/event=0x84,umask=0x1/ --no-merge true Performance counter stats for 'system wide': 1,952 uncore_arb_0/event=0x81,umask=0x1/ 1,921 uncore_arb_1/event=0x81,umask=0x1/ 0 uncore_arb_0/event=0x84,umask=0x1/ 0 uncore_arb_1/event=0x84,umask=0x1/ 0.000575536 seconds time elapsed Signed-off-by: Jin Yao <yao.jin@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20210707055652.962-1-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r-- | tools/perf/builtin-stat.c | 3 | ||||
-rw-r--r-- | tools/perf/util/stat-display.c | 14 |
2 files changed, 13 insertions, 4 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index d25cb8088e8c..634375937db9 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -2445,9 +2445,6 @@ int cmd_stat(int argc, const char **argv) evlist__check_cpu_maps(evsel_list); - if (perf_pmu__has_hybrid()) - stat_config.no_merge = true; - /* * Initialize thread_map with comm names, * so we could print it out on output. diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c index 83a2bc02df15..588601000f3f 100644 --- a/tools/perf/util/stat-display.c +++ b/tools/perf/util/stat-display.c @@ -596,6 +596,18 @@ static void collect_all_aliases(struct perf_stat_config *config, struct evsel *c } } +static bool is_uncore(struct evsel *evsel) +{ + struct perf_pmu *pmu = evsel__find_pmu(evsel); + + return pmu && pmu->is_uncore; +} + +static bool hybrid_uniquify(struct evsel *evsel) +{ + return perf_pmu__has_hybrid() && !is_uncore(evsel); +} + static bool collect_data(struct perf_stat_config *config, struct evsel *counter, void (*cb)(struct perf_stat_config *config, struct evsel *counter, void *data, bool first), @@ -604,7 +616,7 @@ static bool collect_data(struct perf_stat_config *config, struct evsel *counter, if (counter->merged_stat) return false; cb(config, counter, data, true); - if (config->no_merge) + if (config->no_merge || hybrid_uniquify(counter)) uniquify_event_name(counter); else if (counter->auto_merge_stats) collect_all_aliases(config, counter, cb, data); |