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Date: Fri, 26 Jun 2020 14:06:47 -0700
From: Ian Rogers <irogers@...gle.com>
To: Jiri Olsa <jolsa@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Michael Petlan <mpetlan@...hat.com>,
Andi Kleen <ak@...ux.intel.com>,
Kajol Jain <kjain@...ux.ibm.com>,
John Garry <john.garry@...wei.com>,
"Paul A. Clarke" <pc@...ibm.com>,
Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 06/10] perf tools: Collect other metrics in struct egroup
On Fri, Jun 26, 2020 at 12:47 PM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Collecting other metrics in struct egroup object,
> so we can process them later on.
>
> The change will parse or 'other' metric names out of
> expression and 'resolve' them.
>
> Every used expression needs to have 'metric:' prefix,
> like:
> cache_miss_cycles = metric:dcache_miss_cpi + metric:icache_miss_cycles
>
> All 'other' metrics are disolved into one context,
> meaning all 'other' metrics events and addded to
> the parent context.
>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> .../arch/x86/skylake/skl-metrics.json | 2 +-
> tools/perf/util/expr.c | 11 ++
> tools/perf/util/expr.h | 1 +
> tools/perf/util/metricgroup.c | 158 ++++++++++++++++--
> 4 files changed, 157 insertions(+), 15 deletions(-)
>
> diff --git a/tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json b/tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json
> index 8704efeb8d31..71e5a2b471ac 100644
> --- a/tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json
> +++ b/tools/perf/pmu-events/arch/x86/skylake/skl-metrics.json
> @@ -57,7 +57,7 @@
> },
> {
> "BriefDescription": "Instructions Per Cycle (per Logical Processor)",
> - "MetricExpr": "INST_RETIRED.ANY / CPU_CLK_UNHALTED.THREAD",
> + "MetricExpr": "1/metric:CPI",
> "MetricGroup": "TopDownL1",
> "MetricName": "IPC"
> },
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index aa14c7111ecc..cd73dae4588c 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -150,3 +150,14 @@ int expr__find_other(const char *expr, const char *one,
>
> return ret;
> }
> +
> +#define METRIC "metric:"
> +
> +bool expr__is_metric(const char *name, const char **metric)
> +{
> + int ret = !strncmp(name, METRIC, sizeof(METRIC) - 1);
> +
> + if (ret && metric)
> + *metric = name + sizeof(METRIC) - 1;
> + return ret;
> +}
> diff --git a/tools/perf/util/expr.h b/tools/perf/util/expr.h
> index 1a76b002c576..fd924bb4e5cd 100644
> --- a/tools/perf/util/expr.h
> +++ b/tools/perf/util/expr.h
> @@ -35,5 +35,6 @@ int expr__parse(double *final_val, struct expr_parse_ctx *ctx,
> const char *expr, int runtime);
> int expr__find_other(const char *expr, const char *one,
> struct expr_parse_ctx *ids, int runtime);
> +bool expr__is_metric(const char *name, const char **metric);
>
> #endif
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 85e7fa2e2707..f88fd667cc78 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -102,12 +102,20 @@ void metricgroup__rblist_exit(struct rblist *metric_events)
> rblist__exit(metric_events);
> }
>
> +struct eother {
> + const char *metric_name;
> + const char *metric_expr;
> + struct list_head list;
> +};
> +
> struct egroup {
> struct list_head nd;
> struct expr_parse_ctx pctx;
> const char *metric_name;
> const char *metric_expr;
> const char *metric_unit;
> + struct list_head other;
> + int other_cnt;
> int runtime;
> bool has_constraint;
> };
Nit, could we do better than egroup and eother for struct names?
egroup are nodes within the metric group with their associated values,
so would metric_group_node be more intention revealing? eother and
other are metrics referred to by the metric_group_node. Presumably the
metrics are on the same list as egroup? Perhaps eother could be
referenced_metrics?
Thanks,
Ian
> @@ -574,27 +582,66 @@ int __weak arch_get_runtimeparam(void)
> static int __metricgroup__add_metric(struct list_head *group_list,
> struct pmu_event *pe,
> bool metric_no_group,
> - int runtime)
> + int runtime,
> + struct egroup **egp)
> {
> + struct eother *eo;
> struct egroup *eg;
>
> - eg = malloc(sizeof(*eg));
> - if (!eg)
> - return -ENOMEM;
> + if (*egp == NULL) {
> + /*
> + * We got in here for the master group,
> + * allocate it and put it on the list.
> + */
> + eg = malloc(sizeof(*eg));
> + if (!eg)
> + return -ENOMEM;
> +
> + expr__ctx_init(&eg->pctx);
> + eg->metric_name = pe->metric_name;
> + eg->metric_expr = pe->metric_expr;
> + eg->metric_unit = pe->unit;
> + eg->runtime = runtime;
> + eg->has_constraint = metric_no_group || metricgroup__has_constraint(pe);
> + INIT_LIST_HEAD(&eg->other);
> + eg->other_cnt = 0;
> + *egp = eg;
> + } else {
> + /*
> + * We got here for the 'other' metric, via the
> + * recursive metricgroup__add_metric call, add
> + * it to the master group.
> + */
> + eg = *egp;
>
> - expr__ctx_init(&eg->pctx);
> - eg->metric_name = pe->metric_name;
> - eg->metric_expr = pe->metric_expr;
> - eg->metric_unit = pe->unit;
> - eg->runtime = runtime;
> - eg->has_constraint = metric_no_group || metricgroup__has_constraint(pe);
> + eo = malloc(sizeof(*eo));
> + if (!eo)
> + return -ENOMEM;
>
> + eo->metric_name = pe->metric_name;
> + eo->metric_expr = pe->metric_expr;
> + list_add(&eo->list, &eg->other);
> + eg->other_cnt++;
> + eg->has_constraint |= metricgroup__has_constraint(pe);
> + }
> +
> + /*
> + * For both the master and other metrics, we parse all
> + * the metric's IDs and add it to the parent context.
> + */
> if (expr__find_other(pe->metric_expr, NULL, &eg->pctx, runtime) < 0) {
> expr__ctx_clear(&eg->pctx);
> free(eg);
> return -EINVAL;
> }
>
> + /*
> + * We add new group only in the 'master' call,
> + * so bail out for 'other' metric case.
> + */
> + if (eg->other_cnt)
> + return 0;
> +
> if (list_empty(group_list))
> list_add(&eg->nd, group_list);
> else {
> @@ -617,12 +664,67 @@ static int __metricgroup__add_metric(struct list_head *group_list,
> static int metricgroup__add_metric(const char *metric, bool metric_no_group,
> struct strbuf *events,
> struct list_head *group_list,
> - struct pmu_events_map *map)
> + struct pmu_events_map *map,
> + struct egroup *egp);
> +
> +static int resolve_group(struct egroup *eg,
> + bool metric_no_group,
> + struct strbuf *events,
> + struct list_head *group_list,
> + struct pmu_events_map *map)
> +{
> + struct hashmap_entry *cur;
> + size_t bkt;
> + bool all;
> + int ret;
> +
> + /*
> + * Iterate all the parsed IDs and if there's metric,
> + * add it to the same context - recursive call to
> + * metricgroup__add_metric and remove the metric ID
> + * from the context.
> + */
> + do {
> + all = true;
> + hashmap__for_each_entry((&eg->pctx.ids), cur, bkt) {
> + const char *name;
> + char *m;
> +
> + if (!expr__is_metric(cur->key, &name))
> + continue;
> +
> + all = false;
> +
> + m = strdup(name);
> + if (!m)
> + return -ENOMEM;
> +
> + /* The metric:* key itself needs to go out.. */
> + expr__del_id(&eg->pctx, cur->key);
> +
> + /* ... and it gets resolved to the parent context. */
> + ret = metricgroup__add_metric(m, metric_no_group, events,
> + group_list, map, eg);
> + if (ret)
> + return ret;
> + break;
> + }
> + } while (!all);
> +
> + return 0;
> +}
> +
> +static int metricgroup__add_metric(const char *metric, bool metric_no_group,
> + struct strbuf *events,
> + struct list_head *group_list,
> + struct pmu_events_map *map,
> + struct egroup *egp)
> {
> struct pmu_event *pe;
> struct egroup *eg;
> int i, ret;
> bool has_match = false;
> + bool base = egp == NULL;
>
> for (i = 0; ; i++) {
> pe = &map->table[i];
> @@ -644,7 +746,7 @@ static int metricgroup__add_metric(const char *metric, bool metric_no_group,
> ret = __metricgroup__add_metric(group_list,
> pe,
> metric_no_group,
> - 1);
> + 1, &egp);
> if (ret)
> return ret;
> } else {
> @@ -660,13 +762,30 @@ static int metricgroup__add_metric(const char *metric, bool metric_no_group,
> for (j = 0; j < count; j++) {
> ret = __metricgroup__add_metric(
> group_list, pe,
> - metric_no_group, j);
> + metric_no_group, j, &egp);
> if (ret)
> return ret;
> }
> }
> +
> + /*
> + * Process any possible other metrics
> + * included in the expression.
> + */
> + ret = resolve_group(egp, metric_no_group, events,
> + group_list, map);
> + if (ret)
> + return ret;
> }
> }
> +
> + /*
> + * All the IDs are added to the base context,
> + * so we add events only in the 'base' call.
> + */
> + if (!base)
> + return 0;
> +
> list_for_each_entry(eg, group_list, nd) {
> if (events->len > 0)
> strbuf_addf(events, ",");
> @@ -700,7 +819,7 @@ static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
>
> while ((p = strsep(&llist, ",")) != NULL) {
> ret = metricgroup__add_metric(p, metric_no_group, events,
> - group_list, map);
> + group_list, map, NULL);
> if (ret == -EINVAL) {
> fprintf(stderr, "Cannot find metric or group `%s'\n",
> p);
> @@ -715,11 +834,22 @@ static int metricgroup__add_metric_list(const char *list, bool metric_no_group,
> return ret;
> }
>
> +static void egroup__free_other(struct egroup *egroup)
> +{
> + struct eother *eo, *oetmp;
> +
> + list_for_each_entry_safe(eo, oetmp, &egroup->other, list) {
> + list_del(&eo->list);
> + free(eo);
> + }
> +}
> +
> static void metricgroup__free_egroups(struct list_head *group_list)
> {
> struct egroup *eg, *egtmp;
>
> list_for_each_entry_safe (eg, egtmp, group_list, nd) {
> + egroup__free_other(eg);
> expr__ctx_clear(&eg->pctx);
> list_del_init(&eg->nd);
> free(eg);
> --
> 2.25.4
>
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