diff options
| -rw-r--r-- | tools/perf/builtin-ftrace.c | 14 | ||||
| -rw-r--r-- | tools/perf/util/ftrace.h | 1 |
2 files changed, 12 insertions, 3 deletions
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c index 4f76094ea06d..7caa18d5ffc3 100644 --- a/tools/perf/builtin-ftrace.c +++ b/tools/perf/builtin-ftrace.c @@ -841,14 +841,17 @@ static void display_histogram(struct perf_ftrace *ftrace, int buckets[]) bar_len = buckets[0] * bar_total / total; - printf(" %4d - %4d %s | %10d | %.*s%*s |\n", - 0, min_latency ?: 1, use_nsec ? "ns" : "us", - buckets[0], bar_len, bar, bar_total - bar_len, ""); + if (!ftrace->hide_empty || buckets[0]) + printf(" %4d - %4d %s | %10d | %.*s%*s |\n", + 0, min_latency ?: 1, use_nsec ? "ns" : "us", + buckets[0], bar_len, bar, bar_total - bar_len, ""); for (i = 1; i < bucket_num - 1; i++) { unsigned int start, stop; const char *unit = use_nsec ? "ns" : "us"; + if (ftrace->hide_empty && !buckets[i]) + continue; if (!ftrace->bucket_range) { start = (1 << (i - 1)); stop = 1 << i; @@ -884,6 +887,8 @@ print_bucket_info: } bar_len = buckets[bucket_num - 1] * bar_total / total; + if (ftrace->hide_empty && !buckets[bucket_num - 1]) + goto print_stats; if (!ftrace->bucket_range) { printf(" %4d - %-4s %s", 1, "...", use_nsec ? "ms" : "s "); } else { @@ -902,6 +907,7 @@ print_bucket_info: printf(" | %10d | %.*s%*s |\n", buckets[bucket_num - 1], bar_len, bar, bar_total - bar_len, ""); +print_stats: printf("\n# statistics (in %s)\n", ftrace->use_nsec ? "nsec" : "usec"); printf(" total time: %20.0f\n", latency_stats.mean * latency_stats.n); printf(" avg time: %20.0f\n", latency_stats.mean); @@ -1645,6 +1651,8 @@ int cmd_ftrace(int argc, const char **argv) "Minimum latency (1st bucket). Works only with --bucket-range."), OPT_UINTEGER(0, "max-latency", &ftrace.max_latency, "Maximum latency (last bucket). Works only with --bucket-range."), + OPT_BOOLEAN(0, "hide-empty", &ftrace.hide_empty, + "Hide empty buckets in the histogram"), OPT_PARENT(common_options), }; const struct option profile_options[] = { diff --git a/tools/perf/util/ftrace.h b/tools/perf/util/ftrace.h index 395f97b203ea..a9bc47da83a5 100644 --- a/tools/perf/util/ftrace.h +++ b/tools/perf/util/ftrace.h @@ -25,6 +25,7 @@ struct perf_ftrace { unsigned int min_latency; unsigned int max_latency; unsigned int bucket_num; + bool hide_empty; int graph_depth; int func_stack_trace; int func_irq_info; |