From 8bb6c79f24e66538f606076915e918242c02ec7c Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 27 Apr 2011 13:25:24 +0200 Subject: [PATCH] perf stat: Print out miss/hit ratio for L1 data-cache events Print out this kind of l1-dcache-misses percentage: Performance counter stats for './bw_tcp localhost': 29,956,262,201 cycles # 3.002 GHz (scaled from 85.14%) 8,255,209,558 stalled-cycles # 27.56% of all cycles are idle (scaled from 86.56%) 1,206,130,308 l1-dcache-misses # 40.49% of all L1-dcache hits (scaled from 86.30%) 2,978,756,779 l1-dcache-refs # 298.512 M/sec (scaled from 70.02%) 8,861,956,159 instructions # 0.30 insns per cycle # 0.93 stalled cycles per insn (scaled from 84.27%) 1,644,306,068 branches # 164.782 M/sec (scaled from 86.43%) 74,778,443 branch-misses # 4.55% of all branches (scaled from 70.69%) 9978.695711 task-clock # 0.693 CPUs utilized 14.404347983 seconds time elapsed And color the result depending on the severity of cache-trashing. Acked-by: Peter Zijlstra Acked-by Arnaldo Carvalho de Melo Cc: Frederic Weisbecker Link: http://lkml.kernel.org/n/tip-54gmz0zymaid84zcs7joq02p@git.kernel.org Signed-off-by: Ingo Molnar --- tools/perf/builtin-stat.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 5d4e1b9b2d89..03bac6aa014b 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -159,6 +159,7 @@ struct stats runtime_cycles_stats[MAX_NR_CPUS]; struct stats runtime_stalled_cycles_stats[MAX_NR_CPUS]; struct stats runtime_branches_stats[MAX_NR_CPUS]; struct stats runtime_cacherefs_stats[MAX_NR_CPUS]; +struct stats runtime_l1_dcache_stats[MAX_NR_CPUS]; struct stats walltime_nsecs_stats; static int create_perf_stat_counter(struct perf_evsel *evsel) @@ -211,6 +212,8 @@ static void update_shadow_stats(struct perf_evsel *counter, u64 *count) 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]); + else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1D)) + update_stats(&runtime_l1_dcache_stats[0], count[0]); } /* @@ -473,6 +476,29 @@ static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double fprintf(stderr, " of all branches "); } +static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, double avg) +{ + double total, ratio = 0.0; + const char *color; + + total = avg_stats(&runtime_l1_dcache_stats[cpu]); + + if (total) + ratio = avg / total * 100.0; + + color = PERF_COLOR_NORMAL; + if (ratio > 20.0) + color = PERF_COLOR_RED; + else if (ratio > 10.0) + color = PERF_COLOR_MAGENTA; + else if (ratio > 5.0) + color = PERF_COLOR_YELLOW; + + fprintf(stderr, " # "); + color_fprintf(stderr, color, "%5.2f%%", ratio); + fprintf(stderr, " of all L1-dcache hits "); +} + static void abs_printout(int cpu, struct perf_evsel *evsel, double avg) { double total, ratio = 0.0; @@ -519,6 +545,13 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg) } else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) && runtime_branches_stats[cpu].n != 0) { print_branch_misses(cpu, evsel, avg); + } else if ( + evsel->attr.type == PERF_TYPE_HW_CACHE && + evsel->attr.config == ( PERF_COUNT_HW_CACHE_L1D | + ((PERF_COUNT_HW_CACHE_OP_READ) << 8) | + ((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) && + runtime_branches_stats[cpu].n != 0) { + print_l1_dcache_misses(cpu, evsel, avg); } else if (perf_evsel__match(evsel, HARDWARE, HW_CACHE_MISSES) && runtime_cacherefs_stats[cpu].n != 0) { total = avg_stats(&runtime_cacherefs_stats[cpu]); -- 2.20.1