From d58f4c82fed69fdd4a79fa54fe17fd14d98c27aa Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 27 Apr 2011 03:42:18 +0200 Subject: [PATCH] perf stat: Print cache misses as percentage Before: 113,393,041 cache-references # 83.636 M/sec 7,052,454 cache-misses # 5.202 M/sec After: 112,589,441 cache-references # 87.925 M/sec 6,556,354 cache-misses # 5.823 % misses/hits percentages are more expressive than absolute numbers or rates. (Also prettify the CPUs printout line to not have a trailing whitespace.) Acked-by: Peter Zijlstra Acked-by: Arnaldo Carvalho de Melo Cc: Frederic Weisbecker Link: http://lkml.kernel.org/n/tip-axm28f43x439bl41zkvfzd63@git.kernel.org Signed-off-by: Ingo Molnar --- tools/perf/builtin-stat.c | 18 +++++++++++++++--- 1 file changed, 15 insertions(+), 3 deletions(-) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 3a29041f857..0de3a2002f4 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -157,6 +157,7 @@ static double stddev_stats(struct stats *stats) struct stats runtime_nsecs_stats[MAX_NR_CPUS]; struct stats runtime_cycles_stats[MAX_NR_CPUS]; struct stats runtime_branches_stats[MAX_NR_CPUS]; +struct stats runtime_cacherefs_stats[MAX_NR_CPUS]; struct stats walltime_nsecs_stats; static int create_perf_stat_counter(struct perf_evsel *evsel) @@ -219,10 +220,12 @@ static int read_counter_aggr(struct perf_evsel *counter) */ if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK)) update_stats(&runtime_nsecs_stats[0], count[0]); - if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES)) + else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES)) update_stats(&runtime_cycles_stats[0], count[0]); - if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS)) + else if (perf_evsel__match(counter, HARDWARE, HW_BRANCH_INSTRUCTIONS)) update_stats(&runtime_branches_stats[0], count[0]); + else if (perf_evsel__match(counter, HARDWARE, HW_CACHE_REFERENCES)) + update_stats(&runtime_cacherefs_stats[0], count[0]); return 0; } @@ -404,7 +407,7 @@ static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg) return; if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK)) - fprintf(stderr, " # %10.3f CPUs ", + fprintf(stderr, " # %10.3f CPUs", avg / avg_stats(&walltime_nsecs_stats)); } @@ -452,6 +455,15 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg) fprintf(stderr, " # %10.3f %%", ratio); + } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) && + runtime_cacherefs_stats[cpu].n != 0) { + total = avg_stats(&runtime_cacherefs_stats[cpu]); + + if (total) + ratio = avg * 100 / total; + + fprintf(stderr, " # %10.3f %%", ratio); + } else if (runtime_nsecs_stats[cpu].n != 0) { total = avg_stats(&runtime_nsecs_stats[cpu]); -- 2.11.4.GIT