From: Jin Yao Date: Wed, 28 Aug 2019 05:59:32 +0000 (+0800) Subject: perf metricgroup: Support multiple events for metricgroup X-Git-Tag: v5.15~5552^2~3^2~7 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f01642e4912bb80a01d693f4cc6fb0897207a090;p=platform%2Fkernel%2Flinux-starfive.git perf metricgroup: Support multiple events for metricgroup Some uncore metrics don't work as expected. For example, on cascadelakex: root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1 Performance counter stats for 'system wide': 1841092 unc_m_pmm_rpq_inserts 3680816 unc_m_pmm_wpq_inserts 1.001775055 seconds time elapsed root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1 Performance counter stats for 'system wide': 860649746 unc_m_pmm_rpq_occupancy.all 1840557 unc_m_pmm_rpq_inserts 12790627455 unc_m_clockticks 1.001773348 seconds time elapsed No metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' or 'UNC_M_PMM_READ_LATENCY' are reported. The issue is, the case of an alias expanding to mulitple events is not supported, typically the uncore events. (see comments in find_evsel_group()). For UNC_M_PMM_BANDWIDTH.TOTAL in above example, the expanded event group is '{unc_m_pmm_rpq_inserts,unc_m_pmm_wpq_inserts}:W', but the actual events passed to find_evsel_group are: unc_m_pmm_rpq_inserts unc_m_pmm_rpq_inserts unc_m_pmm_rpq_inserts unc_m_pmm_rpq_inserts unc_m_pmm_rpq_inserts unc_m_pmm_rpq_inserts unc_m_pmm_wpq_inserts unc_m_pmm_wpq_inserts unc_m_pmm_wpq_inserts unc_m_pmm_wpq_inserts unc_m_pmm_wpq_inserts unc_m_pmm_wpq_inserts For this multiple events case, it's not supported well. This patch introduces a new field 'metric_leader' in struct evsel. The first event is considered as a metric leader. For the rest of same events, they point to the first event via it's metric_leader field in struct evsel. This design is for adding the counting results of all same events to the first event in group (the metric_leader). With this patch, root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_BANDWIDTH.TOTAL -a -- sleep 1 Performance counter stats for 'system wide': 1842108 unc_m_pmm_rpq_inserts # 337.2 MB/sec UNC_M_PMM_BANDWIDTH.TOTAL 3682209 unc_m_pmm_wpq_inserts 1.001819706 seconds time elapsed root@lkp-csl-2sp2:~# perf stat -M UNC_M_PMM_READ_LATENCY -a -- sleep 1 Performance counter stats for 'system wide': 861970685 unc_m_pmm_rpq_occupancy.all # 219.4 ns UNC_M_PMM_READ_LATENCY 1842772 unc_m_pmm_rpq_inserts 12790196356 unc_m_clockticks 1.001749103 seconds time elapsed Now we can see the correct metrics 'UNC_M_PMM_BANDWIDTH.TOTAL' and 'UNC_M_PMM_READ_LATENCY'. Signed-off-by: Jin Yao Cc: Alexander Shishkin Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Link: http://lore.kernel.org/lkml/20190828055932.8269-5-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index fd60cac..68321d1 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -168,6 +168,7 @@ struct evsel { const char * metric_expr; const char * metric_name; struct evsel **metric_events; + struct evsel *metric_leader; bool collect_stat; bool weak_group; bool percore; diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c index f474a29..a7c0424 100644 --- a/tools/perf/util/metricgroup.c +++ b/tools/perf/util/metricgroup.c @@ -90,57 +90,61 @@ struct egroup { const char *metric_unit; }; -static bool record_evsel(int *ind, struct evsel **start, - int idnum, - struct evsel **metric_events, - struct evsel *ev) -{ - metric_events[*ind] = ev; - if (*ind == 0) - *start = ev; - if (++*ind == idnum) { - metric_events[*ind] = NULL; - return true; - } - return false; -} - static struct evsel *find_evsel_group(struct evlist *perf_evlist, const char **ids, int idnum, struct evsel **metric_events) { - struct evsel *ev, *start = NULL; - int ind = 0; + struct evsel *ev; + int i = 0; + bool leader_found; evlist__for_each_entry (perf_evlist, ev) { - if (ev->collect_stat) - continue; - if (!strcmp(ev->name, ids[ind])) { - if (record_evsel(&ind, &start, idnum, - metric_events, ev)) - return start; + if (!strcmp(ev->name, ids[i])) { + if (!metric_events[i]) + metric_events[i] = ev; } else { - /* - * We saw some other event that is not - * in our list of events. Discard - * the whole match and start again. - */ - ind = 0; - start = NULL; - if (!strcmp(ev->name, ids[ind])) { - if (record_evsel(&ind, &start, idnum, - metric_events, ev)) - return start; + if (++i == idnum) { + /* Discard the whole match and start again */ + i = 0; + memset(metric_events, 0, + sizeof(struct evsel *) * idnum); + continue; + } + + if (!strcmp(ev->name, ids[i])) + metric_events[i] = ev; + else { + /* Discard the whole match and start again */ + i = 0; + memset(metric_events, 0, + sizeof(struct evsel *) * idnum); + continue; } } } - /* - * This can happen when an alias expands to multiple - * events, like for uncore events. - * We don't support this case for now. - */ - return NULL; + + if (i != idnum - 1) { + /* Not whole match */ + return NULL; + } + + metric_events[idnum] = NULL; + + for (i = 0; i < idnum; i++) { + leader_found = false; + evlist__for_each_entry(perf_evlist, ev) { + if (!leader_found && (ev == metric_events[i])) + leader_found = true; + + if (leader_found && + !strcmp(ev->name, metric_events[i]->name)) { + ev->metric_leader = metric_events[i]; + } + } + } + + return metric_events[0]; } static int metricgroup__setup_events(struct list_head *groups, diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c index 696d263..70c87fdb 100644 --- a/tools/perf/util/stat-shadow.c +++ b/tools/perf/util/stat-shadow.c @@ -31,6 +31,8 @@ struct saved_value { int cpu; struct runtime_stat *stat; struct stats stats; + u64 metric_total; + int metric_other; }; static int saved_value_cmp(struct rb_node *rb_node, const void *entry) @@ -212,6 +214,7 @@ void perf_stat__update_shadow_stats(struct evsel *counter, u64 count, { int ctx = evsel_context(counter); u64 count_ns = count; + struct saved_value *v; count *= counter->scale; @@ -266,9 +269,15 @@ void perf_stat__update_shadow_stats(struct evsel *counter, u64 count, update_runtime_stat(st, STAT_APERF, ctx, cpu, count); if (counter->collect_stat) { - struct saved_value *v = saved_value_lookup(counter, cpu, true, - STAT_NONE, 0, st); + v = saved_value_lookup(counter, cpu, true, STAT_NONE, 0, st); update_stats(&v->stats, count); + if (counter->metric_leader) + v->metric_total += count; + } else if (counter->metric_leader) { + v = saved_value_lookup(counter->metric_leader, + cpu, true, STAT_NONE, 0, st); + v->metric_total += count; + v->metric_other++; } } @@ -729,10 +738,10 @@ static void generic_metric(struct perf_stat_config *config, char *n, *pn; expr__ctx_init(&pctx); - expr__add_id(&pctx, name, avg); for (i = 0; metric_events[i]; i++) { struct saved_value *v; struct stats *stats; + u64 metric_total = 0; if (!strcmp(metric_events[i]->name, "duration_time")) { stats = &walltime_nsecs_stats; @@ -744,6 +753,9 @@ static void generic_metric(struct perf_stat_config *config, break; stats = &v->stats; scale = 1.0; + + if (v->metric_other) + metric_total = v->metric_total; } n = strdup(metric_events[i]->name); @@ -757,8 +769,15 @@ static void generic_metric(struct perf_stat_config *config, pn = strchr(n, ' '); if (pn) *pn = 0; - expr__add_id(&pctx, n, avg_stats(stats)*scale); + + if (metric_total) + expr__add_id(&pctx, n, metric_total); + else + expr__add_id(&pctx, n, avg_stats(stats)*scale); } + + expr__add_id(&pctx, name, avg); + if (!metric_events[i]) { const char *p = metric_expr;