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SubjectRe: [PATCH] perf stat: Merge uncore events by default for hybrid platform
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Hi,

On 6/16/2021 2:30 PM, Jin Yao wrote:
> On hybrid platform, by default 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
>
> While 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' still works 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>
> ---
> tools/perf/builtin-stat.c | 3 ---
> tools/perf/util/stat-display.c | 29 +++++++++++++++++++++++++----
> 2 files changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index f9f74a514315..b67a44982b61 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -2442,9 +2442,6 @@ 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 b759dfd633b4..c6070f4684ca 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -595,6 +595,19 @@ static void collect_all_aliases(struct perf_stat_config *config, struct evsel *c
> }
> }
>
> +static bool is_uncore(struct evsel *evsel)
> +{
> + struct perf_pmu *pmu;
> +
> + if (evsel->pmu_name) {
> + pmu = perf_pmu__find(evsel->pmu_name);
> + if (pmu)
> + return pmu->is_uncore;
> + }
> +
> + return false;
> +}
> +
> 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),
> @@ -603,10 +616,18 @@ 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)
> - uniquify_event_name(counter);
> - else if (counter->auto_merge_stats)
> - collect_all_aliases(config, counter, cb, data);
> + if (perf_pmu__has_hybrid()) {
> + if (config->no_merge || !is_uncore(counter))
> + uniquify_event_name(counter);
> + else if (counter->auto_merge_stats)
> + collect_all_aliases(config, counter, cb, data);
> + } else {
> + if (config->no_merge)
> + uniquify_event_name(counter);
> + else if (counter->auto_merge_stats)
> + collect_all_aliases(config, counter, cb, data);
> + }
> +
> return true;
> }
>
>

Any comments for this patch? :)

Thanks
Jin Yao

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