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perf report: Add --skip-empty option to suppress 0 event stat

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To make the output more readable, I think it's better to remove 0's in
the output.  Also the dummy event has no event stats so it just wasts
the space.  Let's use the --skip-empty option to suppress it.

  $ perf report --stat --skip-empty

  Aggregated stats:
             TOTAL events:      16530
              MMAP events:        226
              COMM events:       1596
              EXIT events:          2
          THROTTLE events:        121
        UNTHROTTLE events:        117
              FORK events:       1595
            SAMPLE events:        719
             MMAP2 events:      12147
            CGROUP events:          2
    FINISHED_ROUND events:          2
        THREAD_MAP events:          1
           CPU_MAP events:          1
         TIME_CONV events:          1
  cycles stats:
            SAMPLE events:        719

Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210427013717.1651674-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim
2021-04-26 18:37:15 -07:00
committed by Arnaldo Carvalho de Melo
parent 55f7544438
commit 2775de0b11
9 changed files with 35 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
tools/perf/util/hist.c
+5 -1
View File
@@ -2676,7 +2676,8 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
}
}
size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp)
size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp,
bool skip_empty)
{
struct evsel *pos;
size_t ret = 0;
@@ -2684,6 +2685,9 @@ size_t evlist__fprintf_nr_events(struct evlist *evlist, FILE *fp)
evlist__for_each_entry(evlist, pos) {
struct hists *hists = evsel__hists(pos);
if (skip_empty && !hists->stats.nr_samples)
continue;
ret += fprintf(fp, "%s stats:\n", evsel__name(pos));
ret += fprintf(fp, "%16s events: %10d\n",
"SAMPLE", hists->stats.nr_samples);