Commit c3305257 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf stat: Add more cache-miss percentage printouts 

Print out the cache-miss percentage as well if the cache refs were
collected, for all the generic cache event types.

Before:

   11,103,723,230 dTLB-loads                #  622.471 M/sec                    ( +-  0.30% )
       87,065,337 dTLB-load-misses          #    4.881 M/sec                    ( +-  0.90% )

After:

   11,353,713,242 dTLB-loads                #  626.020 M/sec                    ( +-  0.35% )
      113,393,472 dTLB-load-misses          #    1.00% of all dTLB cache hits   ( +-  0.49% )

Also ASCII color highlight too high percentages, them when it's executed on the console.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Link: http://lkml.kernel.org/n/tip-lkhwxsevdbd9a8nymx0vxc3y@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 2cba3ffb

tools/perf/builtin-stat.c

+136 −2
Original line number Diff line number Diff line
@@ -261,6 +261,10 @@ struct stats runtime_stalled_cycles_back_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			runtime_l1_icache_stats[MAX_NR_CPUS];

struct stats			runtime_ll_cache_stats[MAX_NR_CPUS];

struct stats			runtime_itlb_cache_stats[MAX_NR_CPUS];

struct stats			runtime_dtlb_cache_stats[MAX_NR_CPUS];

struct stats			walltime_nsecs_stats;



static int create_perf_stat_counter(struct perf_evsel *evsel)
@@ -317,6 +321,14 @@ static void update_shadow_stats(struct perf_evsel *counter, u64 *count) 
		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]);

	else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_L1I))

		update_stats(&runtime_l1_icache_stats[0], count[0]);

	else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_LL))

		update_stats(&runtime_ll_cache_stats[0], count[0]);

	else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_DTLB))

		update_stats(&runtime_dtlb_cache_stats[0], count[0]);

	else if (perf_evsel__match(counter, HW_CACHE, HW_CACHE_ITLB))

		update_stats(&runtime_itlb_cache_stats[0], count[0]);

}



/*
@@ -630,6 +642,98 @@ static void print_l1_dcache_misses(int cpu, struct perf_evsel *evsel __used, dou 
	fprintf(stderr, " of all L1-dcache hits  ");

}



static void print_l1_icache_misses(int cpu, struct perf_evsel *evsel __used, double avg)

{

	double total, ratio = 0.0;

	const char *color;



	total = avg_stats(&runtime_l1_icache_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, "%6.2f%%", ratio);

	fprintf(stderr, " of all L1-icache hits  ");

}



static void print_dtlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)

{

	double total, ratio = 0.0;

	const char *color;



	total = avg_stats(&runtime_dtlb_cache_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, "%6.2f%%", ratio);

	fprintf(stderr, " of all dTLB cache hits ");

}



static void print_itlb_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)

{

	double total, ratio = 0.0;

	const char *color;



	total = avg_stats(&runtime_itlb_cache_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, "%6.2f%%", ratio);

	fprintf(stderr, " of all iTLB cache hits ");

}



static void print_ll_cache_misses(int cpu, struct perf_evsel *evsel __used, double avg)

{

	double total, ratio = 0.0;

	const char *color;



	total = avg_stats(&runtime_ll_cache_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, "%6.2f%%", ratio);

	fprintf(stderr, " of all LL-cache hits   ");

}



static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)

{

	double total, ratio = 0.0;
@@ -684,6 +788,34 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg) 
					((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&

			runtime_l1_dcache_stats[cpu].n != 0) {

		print_l1_dcache_misses(cpu, evsel, avg);

	} else if (

		evsel->attr.type == PERF_TYPE_HW_CACHE &&

		evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_L1I |

					((PERF_COUNT_HW_CACHE_OP_READ) << 8) |

					((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&

			runtime_l1_icache_stats[cpu].n != 0) {

		print_l1_icache_misses(cpu, evsel, avg);

	} else if (

		evsel->attr.type == PERF_TYPE_HW_CACHE &&

		evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_DTLB |

					((PERF_COUNT_HW_CACHE_OP_READ) << 8) |

					((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&

			runtime_dtlb_cache_stats[cpu].n != 0) {

		print_dtlb_cache_misses(cpu, evsel, avg);

	} else if (

		evsel->attr.type == PERF_TYPE_HW_CACHE &&

		evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_ITLB |

					((PERF_COUNT_HW_CACHE_OP_READ) << 8) |

					((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&

			runtime_itlb_cache_stats[cpu].n != 0) {

		print_itlb_cache_misses(cpu, evsel, avg);

	} else if (

		evsel->attr.type == PERF_TYPE_HW_CACHE &&

		evsel->attr.config ==  ( PERF_COUNT_HW_CACHE_LL |

					((PERF_COUNT_HW_CACHE_OP_READ) << 8) |

					((PERF_COUNT_HW_CACHE_RESULT_MISS) << 16)) &&

			runtime_ll_cache_stats[cpu].n != 0) {

		print_ll_cache_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]);
@@ -842,10 +974,12 @@ static void print_stat(int argc, const char **argv) 
	}



	if (!csv_output) {

		if (!null_run)

			fprintf(stderr, "\n");

		fprintf(stderr, " %18.9f  seconds time elapsed",

		fprintf(stderr, " %17.9f seconds time elapsed",

				avg_stats(&walltime_nsecs_stats)/1e9);

		if (run_count > 1) {

			fprintf(stderr, "                                        ");

			print_noise_pct(stddev_stats(&walltime_nsecs_stats),

					avg_stats(&walltime_nsecs_stats));

		}

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