diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/perf_counter/builtin-stat.c | 116 |
1 files changed, 67 insertions, 49 deletions
diff --git a/Documentation/perf_counter/builtin-stat.c b/Documentation/perf_counter/builtin-stat.c index ac14086d9a7..6a2936150f2 100644 --- a/Documentation/perf_counter/builtin-stat.c +++ b/Documentation/perf_counter/builtin-stat.c @@ -109,11 +109,75 @@ static void create_perfstat_counter(int counter) } } +/* + * Does the counter have nsecs as a unit? + */ +static inline int nsec_counter(int counter) +{ + if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK)) + return 1; + if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) + return 1; + + return 0; +} + +/* + * Print out the results of a single counter: + */ +static void print_counter(int counter) +{ + __u64 count[3], single_count[3]; + ssize_t res; + int cpu, nv; + int scaled; + + count[0] = count[1] = count[2] = 0; + nv = scale ? 3 : 1; + for (cpu = 0; cpu < nr_cpus; cpu ++) { + res = read(fd[cpu][counter], single_count, nv * sizeof(__u64)); + assert(res == nv * sizeof(__u64)); + + count[0] += single_count[0]; + if (scale) { + count[1] += single_count[1]; + count[2] += single_count[2]; + } + } + + scaled = 0; + if (scale) { + if (count[2] == 0) { + fprintf(stderr, " %14s %-20s\n", + "<not counted>", event_name(counter)); + return; + } + if (count[2] < count[1]) { + scaled = 1; + count[0] = (unsigned long long) + ((double)count[0] * count[1] / count[2] + 0.5); + } + } + + if (nsec_counter(counter)) { + double msecs = (double)count[0] / 1000000; + + fprintf(stderr, " %14.6f %-20s (msecs)", + msecs, event_name(counter)); + } else { + fprintf(stderr, " %14Ld %-20s (events)", + count[0], event_name(counter)); + } + if (scaled) + fprintf(stderr, " (scaled from %.2f%%)", + (double) count[2] / count[1] * 100); + fprintf(stderr, "\n"); +} + static int do_perfstat(int argc, const char **argv) { unsigned long long t0, t1; int counter; - ssize_t res; int status; int pid; @@ -149,55 +213,10 @@ static int do_perfstat(int argc, const char **argv) argv[0]); fprintf(stderr, "\n"); - for (counter = 0; counter < nr_counters; counter++) { - int cpu, nv; - __u64 count[3], single_count[3]; - int scaled; - - count[0] = count[1] = count[2] = 0; - nv = scale ? 3 : 1; - for (cpu = 0; cpu < nr_cpus; cpu ++) { - res = read(fd[cpu][counter], - single_count, nv * sizeof(__u64)); - assert(res == nv * sizeof(__u64)); - - count[0] += single_count[0]; - if (scale) { - count[1] += single_count[1]; - count[2] += single_count[2]; - } - } - - scaled = 0; - if (scale) { - if (count[2] == 0) { - fprintf(stderr, " %14s %-20s\n", - "<not counted>", event_name(counter)); - continue; - } - if (count[2] < count[1]) { - scaled = 1; - count[0] = (unsigned long long) - ((double)count[0] * count[1] / count[2] + 0.5); - } - } - - if (event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_CPU_CLOCK) || - event_id[counter] == EID(PERF_TYPE_SOFTWARE, PERF_COUNT_TASK_CLOCK)) { + for (counter = 0; counter < nr_counters; counter++) + print_counter(counter); - double msecs = (double)count[0] / 1000000; - fprintf(stderr, " %14.6f %-20s (msecs)", - msecs, event_name(counter)); - } else { - fprintf(stderr, " %14Ld %-20s (events)", - count[0], event_name(counter)); - } - if (scaled) - fprintf(stderr, " (scaled from %.2f%%)", - (double) count[2] / count[1] * 100); - fprintf(stderr, "\n"); - } fprintf(stderr, "\n"); fprintf(stderr, " Wall-clock time elapsed: %12.6f msecs\n", (double)(t1-t0)/1e6); @@ -212,7 +231,6 @@ static void skip_signal(int signo) static const char * const stat_usage[] = { "perf stat [<options>] <command>", - "perf stat [<options>] -- <command> [<options>]", NULL }; |