perf metricgroup: Scale the metric result

Some metrics define the scale unit, such as

    {
        "BriefDescription": "Intel Optane DC persistent memory read latency (ns). Derived from unc_m_pmm_rpq_occupancy.all",
        "Counter": "0,1,2,3",
        "EventCode": "0xE0",
        "EventName": "UNC_M_PMM_READ_LATENCY",
        "MetricExpr": "UNC_M_PMM_RPQ_OCCUPANCY.ALL / UNC_M_PMM_RPQ_INSERTS / UNC_M_CLOCKTICKS",
        "MetricName": "UNC_M_PMM_READ_LATENCY",
        "PerPkg": "1",
        "ScaleUnit": "6000000000ns",
        "UMask": "0x1",
        "Unit": "iMC"
    },

For above example, the ratio should be,

ratio = (UNC_M_PMM_RPQ_OCCUPANCY.ALL / UNC_M_PMM_RPQ_INSERTS / UNC_M_CLOCKTICKS) * 6000000000

But in current code, the ratio is not scaled ( * 6000000000)

With this patch, the ratio is scaled and the unit (ns) is printed.

For example,
  #    219.4 ns  UNC_M_PMM_READ_LATENCY

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20190828055932.8269-4-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 33f5e21..f474a29 100644 (file)
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -87,6 +87,7 @@ struct egroup {
        const char **ids;
        const char *metric_name;
        const char *metric_expr;
+       const char *metric_unit;
 };
 
 static bool record_evsel(int *ind, struct evsel **start,
@@ -182,6 +183,7 @@ static int metricgroup__setup_events(struct list_head *groups,
                }
                expr->metric_expr = eg->metric_expr;
                expr->metric_name = eg->metric_name;
+               expr->metric_unit = eg->metric_unit;
                expr->metric_events = metric_events;
                list_add(&expr->nd, &me->head);
        }
@@ -453,6 +455,7 @@ static int metricgroup__add_metric(const char *metric, struct strbuf *events,
                        eg->idnum = idnum;
                        eg->metric_name = pe->metric_name;
                        eg->metric_expr = pe->metric_expr;
+                       eg->metric_unit = pe->unit;
                        list_add_tail(&eg->nd, group_list);
                        ret = 0;
                }

diff --git a/tools/perf/util/metricgroup.h b/tools/perf/util/metricgroup.h
index e5092f6..475c7f9 100644 (file)
--- a/tools/perf/util/metricgroup.h
+++ b/tools/perf/util/metricgroup.h
@@ -20,6 +20,7 @@ struct metric_expr {
        struct list_head nd;
        const char *metric_expr;
        const char *metric_name;
+       const char *metric_unit;
        struct evsel **metric_events;
 };
 

diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 2ed5e00..696d263 100644 (file)
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -715,6 +715,7 @@ static void generic_metric(struct perf_stat_config *config,
                           struct evsel **metric_events,
                           char *name,
                           const char *metric_name,
+                          const char *metric_unit,
                           double avg,
                           int cpu,
                           struct perf_stat_output_ctx *out,
@@ -722,7 +723,7 @@ static void generic_metric(struct perf_stat_config *config,
 {
        print_metric_t print_metric = out->print_metric;
        struct parse_ctx pctx;
-       double ratio;
+       double ratio, scale;
        int i;
        void *ctxp = out->ctx;
        char *n, *pn;
@@ -732,7 +733,6 @@ static void generic_metric(struct perf_stat_config *config,
        for (i = 0; metric_events[i]; i++) {
                struct saved_value *v;
                struct stats *stats;
-               double scale;
 
                if (!strcmp(metric_events[i]->name, "duration_time")) {
                        stats = &walltime_nsecs_stats;
@@ -762,16 +762,32 @@ static void generic_metric(struct perf_stat_config *config,
        if (!metric_events[i]) {
                const char *p = metric_expr;
 
-               if (expr__parse(&ratio, &pctx, &p) == 0)
-                       print_metric(config, ctxp, NULL, "%8.1f",
-                               metric_name ?
-                               metric_name :
-                               out->force_header ?  name : "",
-                               ratio);
-               else
+               if (expr__parse(&ratio, &pctx, &p) == 0) {
+                       char *unit;
+                       char metric_bf[64];
+
+                       if (metric_unit && metric_name) {
+                               if (perf_pmu__convert_scale(metric_unit,
+                                       &unit, &scale) >= 0) {
+                                       ratio *= scale;
+                               }
+
+                               scnprintf(metric_bf, sizeof(metric_bf),
+                                         "%s  %s", unit, metric_name);
+                               print_metric(config, ctxp, NULL, "%8.1f",
+                                            metric_bf, ratio);
+                       } else {
+                               print_metric(config, ctxp, NULL, "%8.1f",
+                                       metric_name ?
+                                       metric_name :
+                                       out->force_header ?  name : "",
+                                       ratio);
+                       }
+               } else {
                        print_metric(config, ctxp, NULL, NULL,
                                     out->force_header ?
                                     (metric_name ? metric_name : name) : "", 0);
+               }
        } else
                print_metric(config, ctxp, NULL, NULL, "", 0);
 
@@ -992,7 +1008,7 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
                        print_metric(config, ctxp, NULL, NULL, name, 0);
        } else if (evsel->metric_expr) {
                generic_metric(config, evsel->metric_expr, evsel->metric_events, evsel->name,
-                               evsel->metric_name, avg, cpu, out, st);
+                               evsel->metric_name, NULL, avg, cpu, out, st);
        } else if (runtime_stat_n(st, STAT_NSECS, 0, cpu) != 0) {
                char unit = 'M';
                char unit_buf[10];
@@ -1021,7 +1037,7 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
                                out->new_line(config, ctxp);
                        generic_metric(config, mexp->metric_expr, mexp->metric_events,
                                        evsel->name, mexp->metric_name,
-                                       avg, cpu, out, st);
+                                       mexp->metric_unit, avg, cpu, out, st);
                }
        }
        if (num == 0)