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Date: Tue, 16 Apr 2024 20:49:21 -0700
From: Ian Rogers <irogers@...gle.com>
To: weilin.wang@...el.com
Cc: Kan Liang <kan.liang@...ux.intel.com>, Namhyung Kim <namhyung@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>, linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org, Perry Taylor <perry.taylor@...el.com>,
Samantha Alt <samantha.alt@...el.com>, Caleb Biggers <caleb.biggers@...el.com>
Subject: Re: [RFC PATCH v5 01/16] perf stat: Add new field in stat_config to
enable hardware aware grouping.
On Fri, Apr 12, 2024 at 2:08 PM <weilin.wang@...el.com> wrote:
>
> From: Weilin Wang <weilin.wang@...el.com>
>
> Hardware counter and event information could be used to help creating event
> groups that better utilize hardware counters and improve multiplexing.
>
> Reviewed-by: Ian Rogers <irogers@...gle.com>
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
> tools/perf/builtin-stat.c | 5 +++++
> tools/perf/util/metricgroup.c | 5 +++++
> tools/perf/util/metricgroup.h | 1 +
> tools/perf/util/stat.h | 1 +
> 4 files changed, 12 insertions(+)
>
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 6bba1a89d030..c4a5f0984295 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -2106,6 +2106,7 @@ static int add_default_attributes(void)
> stat_config.metric_no_threshold,
> stat_config.user_requested_cpu_list,
> stat_config.system_wide,
> + stat_config.hardware_aware_grouping,
> &stat_config.metric_events);
> }
>
> @@ -2139,6 +2140,7 @@ static int add_default_attributes(void)
> stat_config.metric_no_threshold,
> stat_config.user_requested_cpu_list,
> stat_config.system_wide,
> + stat_config.hardware_aware_grouping,
> &stat_config.metric_events);
> }
>
> @@ -2173,6 +2175,7 @@ static int add_default_attributes(void)
> /*metric_no_threshold=*/true,
> stat_config.user_requested_cpu_list,
> stat_config.system_wide,
> + stat_config.hardware_aware_grouping,
> &stat_config.metric_events) < 0)
> return -1;
> }
> @@ -2214,6 +2217,7 @@ static int add_default_attributes(void)
> /*metric_no_threshold=*/true,
> stat_config.user_requested_cpu_list,
> stat_config.system_wide,
> + stat_config.hardware_aware_grouping,
> &stat_config.metric_events) < 0)
> return -1;
>
> @@ -2748,6 +2752,7 @@ int cmd_stat(int argc, const char **argv)
> stat_config.metric_no_threshold,
> stat_config.user_requested_cpu_list,
> stat_config.system_wide,
> + stat_config.hardware_aware_grouping,
> &stat_config.metric_events);
>
> zfree(&metrics);
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 79ef6095ab28..11613450725a 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1690,12 +1690,17 @@ int metricgroup__parse_groups(struct evlist *perf_evlist,
> bool metric_no_threshold,
> const char *user_requested_cpu_list,
> bool system_wide,
> + bool hardware_aware_grouping,
> struct rblist *metric_events)
> {
> const struct pmu_metrics_table *table = pmu_metrics_table__find();
>
> if (!table)
> return -EINVAL;
> + if (hardware_aware_grouping) {
> + pr_debug("Use hardware aware grouping instead of traditional metric grouping method\n");
> + }
nit: single line if statements shouldn't have curlies:
https://www.kernel.org/doc/html/v6.8/process/coding-style.html#placing-braces-and-spaces
Thanks,
Ian
> +
>
> return parse_groups(perf_evlist, pmu, str, metric_no_group, metric_no_merge,
> metric_no_threshold, user_requested_cpu_list, system_wide,
> diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> index d5325c6ec8e1..779f6ede1b51 100644
> --- a/tools/perf/util/metricgroup.h
> +++ b/tools/perf/util/metricgroup.h
> @@ -77,6 +77,7 @@ int metricgroup__parse_groups(struct evlist *perf_evlist,
> bool metric_no_threshold,
> const char *user_requested_cpu_list,
> bool system_wide,
> + bool hardware_aware_grouping,
> struct rblist *metric_events);
> int metricgroup__parse_groups_test(struct evlist *evlist,
> const struct pmu_metrics_table *table,
> diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
> index d6e5c8787ba2..fd7a187551bd 100644
> --- a/tools/perf/util/stat.h
> +++ b/tools/perf/util/stat.h
> @@ -87,6 +87,7 @@ struct perf_stat_config {
> bool metric_no_group;
> bool metric_no_merge;
> bool metric_no_threshold;
> + bool hardware_aware_grouping;
> bool stop_read_counter;
> bool iostat_run;
> char *user_requested_cpu_list;
> --
> 2.42.0
>
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