Messages in this thread Patch in this message | | | Date | Fri, 22 Sep 2017 09:32:16 -0700 | From | tip-bot for Andi Kleen <> | Subject | [tip:perf/core] perf stat: Support duration_time for metrics |
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Commit-ID: fd48aad9b0f3f7654433dfae3a72ceda36e2de28 Gitweb: http://git.kernel.org/tip/fd48aad9b0f3f7654433dfae3a72ceda36e2de28 Author: Andi Kleen <ak@linux.intel.com> AuthorDate: Thu, 31 Aug 2017 12:40:34 -0700 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Wed, 13 Sep 2017 09:49:14 -0300
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> --- tools/perf/util/parse-events.l | 1 + tools/perf/util/stat-shadow.c | 17 +++++++++++++---- 2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l index fdb5bb5..ea2426d 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 664f49a..a2c12d1e 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;
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