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perf top: Save and display the drop count stats

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Add drop count to 'perf top' headers:

  # perf top --stdio
   PerfTop:    3549 irqs/sec  kernel:51.8%  exact: 100.0% lost: 0/0 drop: 0/0 [4000Hz cycles:ppp],  (all, 8 CPUs)

  # perf top
  Samples: 0  of event 'cycles:ppp', 4000 Hz, Event count (approx.): 0 lost: 0/0 drop: 0/0

The format is: <current period drop>/<total drop>

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-2lj87zz8tq9ye1ntax3ulw0n@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa
2018-11-11 20:02:46 +01:00
committed by Arnaldo Carvalho de Melo
parent d63b9f6fea
commit 97f7e0b33d
4 changed files with 13 additions and 5 deletions
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7
tools/perf/util/top.c
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@@ -46,8 +46,9 @@ size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size)
samples_per_sec;
ret = SNPRINTF(bf, size,
" PerfTop:%8.0f irqs/sec kernel:%4.1f%%"
" exact: %4.1f%% lost: %" PRIu64 "/%" PRIu64 " [", samples_per_sec,
ksamples_percent, esamples_percent, top->lost, top->lost_total);
" exact: %4.1f%% lost: %" PRIu64 "/%" PRIu64 " drop: %" PRIu64 "/%" PRIu64 " [",
samples_per_sec, ksamples_percent, esamples_percent,
top->lost, top->lost_total, top->drop, top->drop_total);
} else {
float us_samples_per_sec = top->us_samples / top->delay_secs;
float guest_kernel_samples_per_sec = top->guest_kernel_samples / top->delay_secs;
@@ -113,5 +114,5 @@ void perf_top__reset_sample_counters(struct perf_top *top)
{
top->samples = top->us_samples = top->kernel_samples =
top->exact_samples = top->guest_kernel_samples =
top->guest_us_samples = top->lost = 0;
top->guest_us_samples = top->lost = top->drop = 0;
}