[PATCH 54/75] perf top: Save and display the drop count stats

Arnaldo Carvalho de Melo
2018-12-06T21:30:08Z

From: Jiri Olsa <jolsa@kernel.org>

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>

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: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-top.c | 5 ++++-
tools/perf/ui/browsers/hists.c | 4 ++++
tools/perf/util/top.c | 7 ++++---
tools/perf/util/top.h | 2 +-
4 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 234232d538c2..9166f6087e3f 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1112,8 +1112,11 @@ static int deliver_event(struct ordered_events *qe,
struct machine *machine;
int ret = -1;

- if (should_drop(qevent, top))
+ if (should_drop(qevent, top)) {
+ top->drop++;
+ top->drop_total++;
return 0;
+ }

ret = perf_evlist__parse_sample(evlist, event, &sample);
if (ret) {
diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index ae208c16c8a3..36b262c49f51 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2223,6 +2223,10 @@ static int hists_browser__scnprintf_title(struct hist_browser *browser, char *bf
" lost: %" PRIu64 "/%" PRIu64,
top->lost, top->lost_total);

+ printed += scnprintf(bf + printed, size - printed,
+ " drop: %" PRIu64 "/%" PRIu64,
+ top->drop, top->drop_total);
+
if (top->zero)
printed += scnprintf(bf + printed, size - printed, " [z]");
}
diff --git a/tools/perf/util/top.c b/tools/perf/util/top.c
index e6582fa6a4db..31a8dee9af69 100644
--- a/tools/perf/util/top.c
+++ b/tools/perf/util/top.c
@@ -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;
}
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index 5bce62ebcf14..19f95eaf75c8 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -22,7 +22,7 @@ struct perf_top {
* Symbols will be added here in perf_event__process_sample and will
* get out after decayed.
*/
- u64 samples, lost, lost_total;
+ u64 samples, lost, lost_total, drop, drop_total;
u64 kernel_samples, us_samples;
u64 exact_samples;
u64 guest_us_samples, guest_kernel_samples;
--
2.19.2