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Message-ID: <CAP-5=fVc6UwFKezDKQuwe7yLhL5vofSKWthwLRByTEeqoeUs9w@mail.gmail.com>
Date: Wed, 24 Jan 2024 07:57:18 -0800
From: Ian Rogers <irogers@...gle.com>
To: weilin.wang@...el.com
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>, Kan Liang <kan.liang@...ux.intel.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>, Mark Rutland <mark.rutland@....com>,
Yang Jihong <yangjihong1@...wei.com>
Subject: Re: [RFC PATCH v3 08/18] perf stat: Add functions to get counter info
On Tue, Dec 12, 2023 at 3:03 PM <weilin.wang@...el.com> wrote:
>
> From: Weilin Wang <weilin.wang@...el.com>
>
> Add data structure metricgroup__pmu_counters to represent hardware counters
> available in the system.
>
> Add functions to parse pmu-events and create the list of pmu_info_list to
> hold the counter information of the system.
>
> Add functions to free pmu_info_list and event_info_list before exit
> grouping for hardware-grouping method
>
> This method would fall back to normal grouping when event json files do not
> support hardware aware grouping.
>
> Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> ---
> tools/perf/util/metricgroup.c | 85 +++++++++++++++++++++++++++++++++--
> tools/perf/util/metricgroup.h | 15 +++++++
> 2 files changed, 97 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 24268882d355..a393584c7a73 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1507,6 +1507,27 @@ static int parse_counter(const char *counter,
> return 0;
> }
>
> +static void metricgroup__free_event_info(struct list_head
> + *event_info_list)
> +{
> + struct metricgroup__event_info *e, *tmp;
> +
> + list_for_each_entry_safe(e, tmp, event_info_list, nd) {
> + list_del_init(&e->nd);
> + free(e);
> + }
> +}
> +
> +static void metricgroup__free_pmu_info(struct list_head *pmu_info_list)
> +{
> + struct metricgroup__pmu_counters *p, *tmp;
> +
> + list_for_each_entry_safe(p, tmp, pmu_info_list, nd) {
> + list_del_init(&p->nd);
> + free(p);
> + }
> +}
> +
> static struct metricgroup__event_info *event_info__new(const char *name,
> const char *pmu_name,
> const char *counter,
> @@ -1525,7 +1546,7 @@ static struct metricgroup__event_info *event_info__new(const char *name,
>
> e->name = name;
> e->free_counter = free_counter;
> - e->pmu_name = strdup(pmu_name);
> + e->pmu_name = pmu_name;
> if (free_counter) {
> ret = set_counter_bitmap(0, e->counters);
> if (ret)
> @@ -1560,6 +1581,8 @@ static int metricgroup__add_metric_event_callback(const struct pmu_event *pe,
> struct metricgroup__add_metric_event_data *d = data;
>
> if (!strcasecmp(pe->name, d->event_name)) {
> + if (!pe->counter)
> + return -EINVAL;
> event = event_info__new(d->event_id, pe->pmu, pe->counter, /*free_counter=*/false);
> if (!event)
> return -ENOMEM;
> @@ -1599,7 +1622,7 @@ static int get_metricgroup_events(const char *full_id,
> .event_name = id,
> .event_id = full_id,
> };
> - ret = pmu_events_table_for_each_event(table,
> + ret = pmu_events_table__for_each_event(table, /*pmu=*/NULL,
> metricgroup__add_metric_event_callback, &data);
> }
>
> @@ -1608,6 +1631,57 @@ static int get_metricgroup_events(const char *full_id,
> return ret;
> }
>
> +static struct metricgroup__pmu_counters *pmu_layout__new(const struct pmu_layout *pl)
> +{
> + struct metricgroup__pmu_counters *l;
> +
> + l = zalloc(sizeof(*l));
> +
> + if (!l)
> + return NULL;
> +
> + l->name = pl->pmu;
> + l->size = pl->size;
> + l->fixed_size = pl->fixed_size;
> + pr_debug("create new pmu_layout: [pmu]=%s, [gp_size]=%ld, [fixed_size]=%ld\n",
> + l->name, l->size, l->fixed_size);
> + return l;
> +}
> +
> +static int metricgroup__add_pmu_layout_callback(const struct pmu_layout *pl,
> + void *data)
> +{
> + struct metricgroup__pmu_counters *pmu;
> + struct list_head *d = data;
> + int ret = 0;
> +
> + pmu = pmu_layout__new(pl);
> + if (!pmu)
> + return -ENOMEM;
> + list_add(&pmu->nd, d);
> + return ret;
> +}
> +
> +/**
> + * get_pmu_counter_layouts - Find counter info of the architecture from
> + * the pmu_layouts table
> + * @pmu_info_list: the list that the new counter info of a pmu is added to.
> + * @table: pmu_layouts table that is searched for counter info.
> + */
> +static int get_pmu_counter_layouts(struct list_head *pmu_info_list,
> + const struct pmu_layouts_table
> + *table)
> +{
> + LIST_HEAD(list);
> + int ret;
> +
> + ret = pmu_layouts_table__for_each_layout(table,
> + metricgroup__add_pmu_layout_callback, &list);
> +
> + list_splice(&list, pmu_info_list);
> + return ret;
> +}
> +
> /**
> * hw_aware_build_grouping - Build event groupings by reading counter
> * requirement of the events and counter available on the system from
> @@ -1626,6 +1700,7 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
> LIST_HEAD(event_info_list);
> size_t bkt;
> const struct pmu_events_table *etable = perf_pmu__find_events_table(NULL);
> + const struct pmu_layouts_table *ltable = perf_pmu__find_layouts_table(NULL);
>
> #define RETURN_IF_NON_ZERO(x) do { if (x) return x; } while (0)
> hashmap__for_each_entry(ctx->ids, cur, bkt) {
> @@ -1635,9 +1710,13 @@ static int hw_aware_build_grouping(struct expr_parse_ctx *ctx __maybe_unused,
>
> ret = get_metricgroup_events(id, etable, &event_info_list);
> if (ret)
> - return ret;
> + goto err_out;
> }
> + ret = get_pmu_counter_layouts(&pmu_info_list, ltable);
>
> +err_out:
> + metricgroup__free_event_info(&event_info_list);
> + metricgroup__free_pmu_info(&pmu_info_list);
> return ret;
> #undef RETURN_IF_NON_ZERO
> }
> diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
> index 3704545c9a11..802ca15e7c6b 100644
> --- a/tools/perf/util/metricgroup.h
> +++ b/tools/perf/util/metricgroup.h
> @@ -94,6 +94,21 @@ struct metricgroup__event_info {
> DECLARE_BITMAP(counters, NR_COUNTERS);
> };
>
> +/**
> + * A node is the counter availability of a pmu.
> + * This info is built up at the beginning from JSON file and
> + * used as a reference in metric grouping process.
> + */
> +struct metricgroup__pmu_counters {
> + struct list_head nd;
> + /** The name of the pmu the event collected on. */
> + const char *name;
> + //DECLARE_BITMAP(counter_bits, NR_COUNTERS);
nit: this can go.
> + /** The number of gp counters in the pmu. */
> + size_t size;
> + size_t fixed_size;
nit: same naming concern.
Thanks,
Ian
> +};
> +
> /**
> * Each group is one node in the group string list.
> */
> --
> 2.39.3
>
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