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authorAndi Kleen <ak@linux.intel.com>2017-08-31 12:40:34 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-09-13 09:49:14 -0300
commitfd48aad9b0f3f7654433dfae3a72ceda36e2de28 (patch)
tree3d3a9de041b7c77a47233740b8858eb65a0229d5 /tools/perf/util
parent4e1a096380e3b558ef021afc08e193ce5d1be478 (diff)
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perf stat: Support duration_time for metrics
Some of the metrics formulas (like GFLOPs) need to know how long the measurement period is. Support an internal event called duration_time, which reports time in second. It maps to the dummy event, but is special cased for statistics to report the walltime duration. So far it is not printed, but only used internally for metrics. Signed-off-by: Andi Kleen <ak@linux.intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: http://lkml.kernel.org/r/20170831194036.30146-10-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util')
-rw-r--r--tools/perf/util/parse-events.l1
-rw-r--r--tools/perf/util/stat-shadow.c17
2 files changed, 14 insertions, 4 deletions
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index fdb5bb52f01f..ea2426daf7e8 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -288,6 +288,7 @@ cpu-migrations|migrations { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COU
alignment-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_ALIGNMENT_FAULTS); }
emulation-faults { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_EMULATION_FAULTS); }
dummy { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_DUMMY); }
+duration_time { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_DUMMY); }
bpf-output { return sym(yyscanner, PERF_TYPE_SOFTWARE, PERF_COUNT_SW_BPF_OUTPUT); }
/*
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 664f49a9b012..a2c12d1ef32a 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -641,11 +641,20 @@ static void generic_metric(const char *metric_expr,
expr__add_id(&pctx, name, avg);
for (i = 0; metric_events[i]; i++) {
struct saved_value *v;
+ struct stats *stats;
+ double scale;
- v = saved_value_lookup(metric_events[i], cpu, false);
- if (!v)
- break;
- expr__add_id(&pctx, metric_events[i]->name, avg_stats(&v->stats));
+ if (!strcmp(metric_events[i]->name, "duration_time")) {
+ stats = &walltime_nsecs_stats;
+ scale = 1e-9;
+ } else {
+ v = saved_value_lookup(metric_events[i], cpu, false);
+ if (!v)
+ break;
+ stats = &v->stats;
+ scale = 1.0;
+ }
+ expr__add_id(&pctx, metric_events[i]->name, avg_stats(stats)*scale);
}
if (!metric_events[i]) {
const char *p = metric_expr;