linux.git (original) (raw)

Print even more detailed statistics if requested via perf stat -d: -d: detailed events, L1 and LLC data cache -d -d: more detailed events, dTLB and iTLB events -d -d -d: very detailed events, adding prefetch events Full output looks like this now: Performance counter stats for '/home/mingo/hackbench 10' (5 runs): 1703.674707 task-clock # 8.709 CPUs utilized ( +- 4.19% ) 49,068 context-switches # 0.029 M/sec ( +- 16.66% ) 8,303 CPU-migrations # 0.005 M/sec ( +- 24.90% ) 17,397 page-faults # 0.010 M/sec ( +- 0.46% ) 2,345,389,239 cycles # 1.377 GHz ( +- 4.61% ) [55.90%] 1,884,503,527 stalled-cycles-frontend # 80.35% frontend cycles idle ( +- 5.67% ) [50.39%] 743,919,737 stalled-cycles-backend # 31.72% backend cycles idle ( +- 8.75% ) [49.91%] 1,314,416,379 instructions # 0.56 insns per cycle # 1.43 stalled cycles per insn ( +- 2.53% ) [60.87%] 272,592,567 branches # 160.003 M/sec ( +- 1.74% ) [56.56%] 3,794,846 branch-misses # 1.39% of all branches ( +- 6.59% ) [58.50%] 449,982,778 L1-dcache-loads # 264.125 M/sec ( +- 2.47% ) [49.88%] 22,404,961 L1-dcache-load-misses # 4.98% of all L1-dcache hits ( +- 6.08% ) [55.05%] 6,204,750 LLC-loads # 3.642 M/sec ( +- 8.91% ) [43.75%] 1,837,411 LLC-load-misses # 1.078 M/sec ( +- 7.27% ) [12.07%] 411,440,421 L1-icache-loads # 241.502 M/sec ( +- 5.60% ) [36.52%] 27,556,832 L1-icache-load-misses # 16.175 M/sec ( +- 7.46% ) [46.72%] 464,067,627 dTLB-loads # 272.392 M/sec ( +- 4.46% ) [54.17%] 10,765,648 dTLB-load-misses # 6.319 M/sec ( +- 3.18% ) [48.68%] 1,273,080,386 iTLB-loads # 747.256 M/sec ( +- 3.38% ) [47.53%] 117,481 iTLB-load-misses # 0.069 M/sec ( +- 14.99% ) [47.01%] 4,590,653 L1-dcache-prefetches # 2.695 M/sec ( +- 4.49% ) [46.19%] 1,712,660 L1-dcache-prefetch-misses # 1.005 M/sec ( +- 3.75% ) [44.82%] 0.195622057 seconds time elapsed ( +- 6.84% ) Also clean up the attribute construction code to be appending, and factor it out into add_default_attributes(). Tweak the coverage percentage printout a bit, so that it's easier to view it alongside the +- sttddev colum. 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-to3kgu04449s64062val8b62@git.kernel.orgSigned-off-by: Ingo Molnar mingo@elte.hu

@@ -6,24 +6,28 @@

* Sample output:

- $ perf stat ~/hackbench 10

- Time: 0.104

+ $ perf stat ./hackbench 10

- Performance counter stats for '/home/mingo/hackbench':

+ Time: 0.118

- 1255.538611 task clock ticks # 10.143 CPU utilization factor

- 54011 context switches # 0.043 M/sec

- 385 CPU migrations # 0.000 M/sec

- 17755 pagefaults # 0.014 M/sec

- 3808323185 CPU cycles # 3033.219 M/sec

- 1575111190 instructions # 1254.530 M/sec

- 17367895 cache references # 13.833 M/sec

- 7674421 cache misses # 6.112 M/sec

+ Performance counter stats for './hackbench 10':

- Wall-clock time elapsed: 123.786620 msecs

+ 1708.761321 task-clock # 11.037 CPUs utilized

+ 41,190 context-switches # 0.024 M/sec

+ 6,735 CPU-migrations # 0.004 M/sec

+ 17,318 page-faults # 0.010 M/sec

+ 5,205,202,243 cycles # 3.046 GHz

+ 3,856,436,920 stalled-cycles-frontend # 74.09% frontend cycles idle

+ 1,600,790,871 stalled-cycles-backend # 30.75% backend cycles idle

+ 2,603,501,247 instructions # 0.50 insns per cycle

+ # 1.48 stalled cycles per insn

+ 484,357,498 branches # 283.455 M/sec

+ 6,388,934 branch-misses # 1.32% of all branches

+ 0.154822978 seconds time elapsed

* Improvements and fixes by:

@@ -75,22 +79,10 @@ static struct perf_event_attr default_attrs[] = {

};

- * Detailed stats:

+ * Detailed stats (-d), covering the L1 and last level data caches:

static struct perf_event_attr detailed_attrs[] = {

- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_TASK_CLOCK },

- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CONTEXT_SWITCHES },

- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_CPU_MIGRATIONS },

- { .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_PAGE_FAULTS },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_STALLED_CYCLES_BACKEND },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_INSTRUCTIONS },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_INSTRUCTIONS },

- { .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_BRANCH_MISSES },

{ .type = PERF_TYPE_HW_CACHE,

.config =

PERF_COUNT_HW_CACHE_L1D << 0 |

@@ -116,6 +108,69 @@ static struct perf_event_attr detailed_attrs[] = {

(PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },

};

+/*

+ * Very detailed stats (-d -d), covering the instruction cache and the TLB caches:

+ */

+static struct perf_event_attr very_detailed_attrs[] = {

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_L1I << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_L1I << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_DTLB << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_DTLB << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_ITLB << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_ITLB << 0 |

+ (PERF_COUNT_HW_CACHE_OP_READ << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },

+};

+/*

+ * Very, very detailed stats (-d -d -d), adding prefetch events:

+ */

+static struct perf_event_attr very_very_detailed_attrs[] = {

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_L1D << 0 |

+ (PERF_COUNT_HW_CACHE_OP_PREFETCH << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16) },

+ { .type = PERF_TYPE_HW_CACHE,

+ .config =

+ PERF_COUNT_HW_CACHE_L1D << 0 |

+ (PERF_COUNT_HW_CACHE_OP_PREFETCH << 8) |

+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16) },

+};

struct perf_evlist *evsel_list;

static bool system_wide = false;

@@ -129,7 +184,7 @@ static pid_t target_pid = -1;

static pid_t target_tid = -1;

static pid_t child_pid = -1;

static bool null_run = false;

-static bool detailed_run = false;

+static int detailed_run = 0;

static bool sync_run = false;

static bool big_num = true;

static int big_num_opt = -1;

@@ -464,7 +519,7 @@ static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)

{

double msecs = avg / 1e6;

char cpustr[16] = { '\0', };

- const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-24s";

+ const char *fmt = csv_output ? "%s%.6f%s%s" : "%s%18.6f%s%-25s";

if (no_aggr)

sprintf(cpustr, "CPU%*d%s",

@@ -584,9 +639,9 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)

if (csv_output)

fmt = "%s%.0f%s%s";

else if (big_num)

- fmt = "%s%'18.0f%s%-24s";

+ fmt = "%s%'18.0f%s%-25s";

else

- fmt = "%s%18.0f%s%-24s";

+ fmt = "%s%18.0f%s%-25s";

if (no_aggr)

sprintf(cpustr, "CPU%*d%s",

@@ -616,7 +671,7 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)

if (total && avg) {

ratio = total / avg;

- fprintf(stderr, "\n # %5.2f stalled cycles per insn", ratio);

+ fprintf(stderr, "\n # %5.2f stalled cycles per insn", ratio);

}

} else if (perf_evsel__match(evsel, HARDWARE, HW_BRANCH_MISSES) &&

@@ -704,7 +759,7 @@ static void print_counter_aggr(struct perf_evsel *counter)

avg_enabled = avg_stats(&ps->res_stats[1]);

avg_running = avg_stats(&ps->res_stats[2]);

- fprintf(stderr, " (%.2f%%)", 100 * avg_running / avg_enabled);

+ fprintf(stderr, " [%5.2f%%]", 100 * avg_running / avg_enabled);

}

fprintf(stderr, "\n");

}

@@ -854,7 +909,7 @@ static const struct option options[] = {

"repeat command and print average + stddev (max: 100)"),

OPT_BOOLEAN('n', "null", &null_run,

"null run - dont start any counters"),

- OPT_BOOLEAN('d', "detailed", &detailed_run,

+ OPT_INCR('d', "detailed", &detailed_run,

"detailed run - start a lot of events"),

OPT_BOOLEAN('S', "sync", &sync_run,

"call sync() before starting a run"),

@@ -873,6 +928,70 @@ static const struct option options[] = {

OPT_END()

};

+/*

+ * Add default attributes, if there were no attributes specified or

+ * if -d/--detailed, -d -d or -d -d -d is used:

+ */

+static int add_default_attributes(void)

+ struct perf_evsel *pos;

+ size_t attr_nr = 0;

+ size_t c;

+ /* Set attrs if no event is selected and !null_run: */

+ if (null_run)

+ return 0;

+ if (!evsel_list->nr_entries) {

+ for (c = 0; c < ARRAY_SIZE(default_attrs); c++) {

+ pos = perf_evsel__new(default_attrs + c, c + attr_nr);

+ if (pos == NULL)

+ return -1;

+ perf_evlist__add(evsel_list, pos);

+ }

+ attr_nr += c;

+ }

+ /* Detailed events get appended to the event list: */

+ if (detailed_run < 1)

+ return 0;

+ /* Append detailed run extra attributes: */

+ for (c = 0; c < ARRAY_SIZE(detailed_attrs); c++) {

+ pos = perf_evsel__new(detailed_attrs + c, c + attr_nr);

+ if (pos == NULL)

+ return -1;

+ perf_evlist__add(evsel_list, pos);

+ }

+ attr_nr += c;

+ if (detailed_run < 2)

+ return 0;

+ /* Append very detailed run extra attributes: */

+ for (c = 0; c < ARRAY_SIZE(very_detailed_attrs); c++) {

+ pos = perf_evsel__new(very_detailed_attrs + c, c + attr_nr);

+ if (pos == NULL)

+ return -1;

+ perf_evlist__add(evsel_list, pos);

+ }

+ if (detailed_run < 3)

+ return 0;

+ /* Append very, very detailed run extra attributes: */

+ for (c = 0; c < ARRAY_SIZE(very_very_detailed_attrs); c++) {

+ pos = perf_evsel__new(very_very_detailed_attrs + c, c + attr_nr);

+ if (pos == NULL)

+ return -1;

+ perf_evlist__add(evsel_list, pos);

+ }

+ return 0;

int cmd_stat(int argc, const char **argv, const char *prefix __used)

{

struct perf_evsel *pos;

@@ -918,28 +1037,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)

usage_with_options(stat_usage, options);

}

- /* Set attrs and nr_counters if no event is selected and !null_run */

- if (detailed_run) {

- size_t c;

- for (c = 0; c < ARRAY_SIZE(detailed_attrs); ++c) {

- pos = perf_evsel__new(&detailed_attrs[c], c);

- if (pos == NULL)

- goto out;

- perf_evlist__add(evsel_list, pos);

- }

- /* Set attrs and nr_counters if no event is selected and !null_run */

- if (!detailed_run && !null_run && !evsel_list->nr_entries) {

- size_t c;

- for (c = 0; c < ARRAY_SIZE(default_attrs); ++c) {

- pos = perf_evsel__new(&default_attrs[c], c);

- if (pos == NULL)

- goto out;

- perf_evlist__add(evsel_list, pos);

- }

+ if (add_default_attributes())

+ goto out;

if (target_pid != -1)

target_tid = target_pid;