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| author | Namhyung Kim <namhyung.kim@lge.com> | 2013-05-14 11:09:00 +0900 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:43:31 +0900 |
| commit | a362e371abaf0518e1ec876a1dc5137b18f457ac (patch) | |
| tree | 1ac7284fdab8aa9715ab3dab38169930743eef7f | |
| parent | 185ec5a45b5a65fc0e3c0731081e4f605236d0a4 (diff) | |
| download | linux-3.10-a362e371abaf0518e1ec876a1dc5137b18f457ac.tar.gz linux-3.10-a362e371abaf0518e1ec876a1dc5137b18f457ac.tar.bz2 linux-3.10-a362e371abaf0518e1ec876a1dc5137b18f457ac.zip | |
perf top: Fix percent output when no samples collected
If there's no sample, kernel and exact percent output at the header
looked like "-nan%".
Tested-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1368497347-9628-3-git-send-email-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/util/top.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/tools/perf/util/top.c b/tools/perf/util/top.c index 54d37a4753c..f857b51b6bd 100644 --- a/tools/perf/util/top.c +++ b/tools/perf/util/top.c @@ -23,20 +23,31 @@ size_t perf_top__header_snprintf(struct perf_top *top, char *bf, size_t size) { - float samples_per_sec = top->samples / top->delay_secs; - float ksamples_per_sec = top->kernel_samples / top->delay_secs; - float esamples_percent = (100.0 * top->exact_samples) / top->samples; + float samples_per_sec; + float ksamples_per_sec; + float esamples_percent; struct perf_record_opts *opts = &top->record_opts; struct perf_target *target = &opts->target; size_t ret = 0; + if (top->samples) { + samples_per_sec = top->samples / top->delay_secs; + ksamples_per_sec = top->kernel_samples / top->delay_secs; + esamples_percent = (100.0 * top->exact_samples) / top->samples; + } else { + samples_per_sec = ksamples_per_sec = esamples_percent = 0.0; + } + if (!perf_guest) { + float ksamples_percent = 0.0; + + if (samples_per_sec) + ksamples_percent = (100.0 * ksamples_per_sec) / + samples_per_sec; ret = SNPRINTF(bf, size, " PerfTop:%8.0f irqs/sec kernel:%4.1f%%" " exact: %4.1f%% [", samples_per_sec, - 100.0 - (100.0 * ((samples_per_sec - ksamples_per_sec) / - samples_per_sec)), - esamples_percent); + ksamples_percent, esamples_percent); } 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; |