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Date: Mon, 19 Jul 2021 21:36:17 +0200
From: Jiri Olsa <jolsa@...hat.com>
To: Jin Yao <yao.jin@...ux.intel.com>
Cc: acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
mingo@...hat.com, alexander.shishkin@...ux.intel.com,
Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 3/3] perf tools: Enable on a list of CPUs for hybrid
On Mon, Jul 12, 2021 at 03:12:35PM +0800, Jin Yao wrote:
> The perf-record and perf-stat have supported the option '-C/--cpus'
> to count or collect only on the list of CPUs provided. This option
> needs to be supported for hybrid as well.
>
> For hybrid support, it needs to check that the CPUs are available on
> hybrid PMU. One example for AlderLake, cpu0-7 is 'cpu_core', cpu8-11
> is 'cpu_atom'.
>
> Before:
>
> # perf stat -e cpu_core/cycles/ -C11 -- sleep 1
>
> Performance counter stats for 'CPU(s) 11':
>
> <not supported> cpu_core/cycles/
>
> 1.006179431 seconds time elapsed
>
> The perf-stat silently returned "<not supported>" without any helpful
> information. It should error out that cpu11 was not 'cpu_core'.
>
> After:
>
> # perf stat -e cpu_core/cycles/ -C11 -- sleep 1
> WARNING: 11 isn't a 'cpu_core', please use a CPU list in the 'cpu_core' range (0-7)
> failed to use cpu list 11
>
> We also need to support the events without pmu prefix specified.
>
> # perf stat -e cycles -C11 -- sleep 1
> WARNING: 11 isn't a 'cpu_core', please use a CPU list in the 'cpu_core' range (0-7)
>
> Performance counter stats for 'CPU(s) 11':
>
> 1,067,373 cpu_atom/cycles/
>
> 1.005544738 seconds time elapsed
>
> The perf tool creates two cycles events automatically, cpu_core/cycles/ and
> cpu_atom/cycles/. It checks that cpu11 is not 'cpu_core', then shows a warning
> for cpu_core/cycles/ and only count the cpu_atom/cycles/.
>
> If part of cpus are 'cpu_core' and part of cpus are 'cpu_atom', the example,
>
> # perf stat -e cycles -C0,11 -- sleep 1
> WARNING: use 0 in 'cpu_core' for 'cycles', skip other cpus in list.
> WARNING: use 11 in 'cpu_atom' for 'cycles', skip other cpus in list.
>
> Performance counter stats for 'CPU(s) 0,11':
>
> 1,914,704 cpu_core/cycles/
> 2,036,983 cpu_atom/cycles/
>
> 1.005815641 seconds time elapsed
>
> It now automatically selects cpu0 for cpu_core/cycles/, selects cpu11 for
> cpu_atom/cycles/, and output with some warnings.
>
> Some more complex examples,
>
> # perf stat -e cycles,instructions -C0,11 -- sleep 1
> WARNING: use 0 in 'cpu_core' for 'cycles', skip other cpus in list.
> WARNING: use 11 in 'cpu_atom' for 'cycles', skip other cpus in list.
> WARNING: use 0 in 'cpu_core' for 'instructions', skip other cpus in list.
> WARNING: use 11 in 'cpu_atom' for 'instructions', skip other cpus in list.
>
> Performance counter stats for 'CPU(s) 0,11':
>
> 2,780,387 cpu_core/cycles/
> 1,583,432 cpu_atom/cycles/
> 3,957,277 cpu_core/instructions/
> 1,167,089 cpu_atom/instructions/
>
> 1.006005124 seconds time elapsed
>
> # perf stat -e cycles,cpu_atom/instructions/ -C0,11 -- sleep 1
> WARNING: use 0 in 'cpu_core' for 'cycles', skip other cpus in list.
> WARNING: use 11 in 'cpu_atom' for 'cycles', skip other cpus in list.
> WARNING: use 11 in 'cpu_atom' for 'cpu_atom/instructions/', skip other cpus in list.
>
> Performance counter stats for 'CPU(s) 0,11':
>
> 3,290,301 cpu_core/cycles/
> 1,953,073 cpu_atom/cycles/
> 1,407,869 cpu_atom/instructions/
>
> 1.006260912 seconds time elapsed
>
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
> v3:
> - Rebase to perf/core.
> - No functional change.
>
> v2:
> - Automatically map to hybrid pmu.
>
> tools/perf/builtin-record.c | 7 ++++
> tools/perf/builtin-stat.c | 6 +++
> tools/perf/util/evlist-hybrid.c | 65 +++++++++++++++++++++++++++++++++
> tools/perf/util/evlist-hybrid.h | 1 +
> tools/perf/util/evlist.c | 1 +
> tools/perf/util/pmu.c | 35 ++++++++++++++++++
> tools/perf/util/pmu.h | 4 ++
> 7 files changed, 119 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 671a21c9ee4d..9518b028b850 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -2884,6 +2884,13 @@ int cmd_record(int argc, const char **argv)
> /* Enable ignoring missing threads when -u/-p option is defined. */
> rec->opts.ignore_missing_thread = rec->opts.target.uid != UINT_MAX || rec->opts.target.pid;
>
> + if (evlist__use_cpu_list(rec->evlist, rec->opts.target.cpu_list)) {
> + pr_err("failed to use cpu list %s\n",
> + rec->opts.target.cpu_list);
> + goto out;
> + }
> +
> + rec->opts.target.hybrid = perf_pmu__has_hybrid();
> err = -ENOMEM;
> if (evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
> usage_with_options(record_usage, record_options);
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index d25cb8088e8c..f7067587008f 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -2430,6 +2430,12 @@ int cmd_stat(int argc, const char **argv)
> if ((stat_config.aggr_mode == AGGR_THREAD) && (target.system_wide))
> target.per_thread = true;
>
> + if (evlist__use_cpu_list(evsel_list, target.cpu_list)) {
> + pr_err("failed to use cpu list %s\n", target.cpu_list);
> + goto out;
> + }
> +
> + target.hybrid = perf_pmu__has_hybrid();
> if (evlist__create_maps(evsel_list, &target) < 0) {
> if (target__has_task(&target)) {
> pr_err("Problems finding threads of monitor\n");
> diff --git a/tools/perf/util/evlist-hybrid.c b/tools/perf/util/evlist-hybrid.c
> index db3f5fbdebe1..13c9f3063dda 100644
> --- a/tools/perf/util/evlist-hybrid.c
> +++ b/tools/perf/util/evlist-hybrid.c
> @@ -86,3 +86,68 @@ bool evlist__has_hybrid(struct evlist *evlist)
>
> return false;
> }
> +
> +int evlist__use_cpu_list(struct evlist *evlist, const char *cpu_list)
the name seems not to cover what it's doing, how about something
like evlist__fix_cpus or such
> +{
> + struct perf_cpu_map *cpus;
> + struct evsel *evsel, *tmp;
> + struct perf_pmu *pmu;
> + int ret, unmatched_count = 0, events_nr = 0;
> +
> + if (!perf_pmu__has_hybrid() || !cpu_list)
> + return 0;
> +
> + cpus = perf_cpu_map__new(cpu_list);
> + if (!cpus)
> + return -1;
> +
> + evlist__for_each_entry_safe(evlist, tmp, evsel) {
> + struct perf_cpu_map *matched_cpus, *unmatched_cpus;
> + char buf1[128], buf2[128];
> +
> + pmu = perf_pmu__find_hybrid_pmu(evsel->pmu_name);
> + if (!pmu)
> + continue;
> +
> + ret = perf_pmu__cpus_match(pmu, cpus, &matched_cpus,
> + &unmatched_cpus);
> + if (ret)
> + goto out;
> +
> + events_nr++;
> +
> + if (matched_cpus->nr > 0 && (unmatched_cpus->nr > 0 ||
> + matched_cpus->nr < cpus->nr ||
> + matched_cpus->nr < pmu->cpus->nr)) {
> + perf_cpu_map__put(evsel->core.cpus);
> + perf_cpu_map__put(evsel->core.own_cpus);
> + evsel->core.cpus = perf_cpu_map__get(matched_cpus);
> + evsel->core.own_cpus = perf_cpu_map__get(matched_cpus);
I'm bit confused in here.. AFAIUI there's 2 evsel objects create
for hybrid 'cycles' ... should they have already proper cpus set?
> +
> + if (unmatched_cpus->nr > 0) {
> + cpu_map__snprint(matched_cpus, buf1, sizeof(buf1));
> + pr_warning("WARNING: use %s in '%s' for '%s', skip other cpus in list.\n",
> + buf1, pmu->name, evsel->name);
> + }
> + }
> +
> + if (matched_cpus->nr == 0) {
> + evlist__remove(evlist, evsel);
> + evsel__delete(evsel);
> +
> + cpu_map__snprint(cpus, buf1, sizeof(buf1));
> + cpu_map__snprint(pmu->cpus, buf2, sizeof(buf2));
> + pr_warning("WARNING: %s isn't a '%s', please use a CPU list in the '%s' range (%s)\n",
> + buf1, pmu->name, pmu->name, buf2);
> + unmatched_count++;
> + }
hum, should we rather fail in here?
jirka
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