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linux/tools/perf/builtin-stat.c
Andi Kleen 33e49ea70d perf tools: Make stat/record print fatal signals of the target program 
When a program crashes under perf there is no message about it, unlike
when running it from bash. This can be confusing and lead to wrong
actions during debugging.

Print fatal signals in perf stat/record.

Thanks to Furat Afram for finding the problem originally

Link: http://lkml.kernel.org/r/1316122302-24306-1-git-send-email-andi@firstfloor.org
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2011-09-29 17:09:46 -03:00

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/*
* builtin-stat.c
*
* Builtin stat command: Give a precise performance counters summary
* overview about any workload, CPU or specific PID.
*
* Sample output:
$ perf stat ./hackbench 10
Time: 0.118
Performance counter stats for './hackbench 10':
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
*
* Copyright (C) 2008-2011, Red Hat Inc, Ingo Molnar <mingo@redhat.com>
*
* Improvements and fixes by:
*
* Arjan van de Ven <arjan@linux.intel.com>
* Yanmin Zhang <yanmin.zhang@intel.com>
* Wu Fengguang <fengguang.wu@intel.com>
* Mike Galbraith <efault@gmx.de>
* Paul Mackerras <paulus@samba.org>
* Jaswinder Singh Rajput <jaswinder@kernel.org>
*
* Released under the GPL v2. (and only v2, not any later version)
*/
#include "perf.h"
#include "builtin.h"
#include "util/util.h"
#include "util/parse-options.h"
#include "util/parse-events.h"
#include "util/event.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/debug.h"
#include "util/color.h"
#include "util/header.h"
#include "util/cpumap.h"
#include "util/thread.h"
#include "util/thread_map.h"
#include <sys/prctl.h>
#include <math.h>
#include <locale.h>
#define DEFAULT_SEPARATOR " "
#define CNTR_NOT_SUPPORTED "<not supported>"
#define CNTR_NOT_COUNTED "<not counted>"
static struct perf_event_attr default_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 },
};
/*
* Detailed stats (-d), covering the L1 and last level data caches:
*/
static struct perf_event_attr detailed_attrs[] = {
{ .type = PERF_TYPE_HW_CACHE,
.config =
PERF_COUNT_HW_CACHE_L1D << 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_L1D << 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_LL << 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_LL << 0 |
(PERF_COUNT_HW_CACHE_OP_READ << 8) |
(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;
static int run_idx = 0;
static int run_count = 1;
static bool no_inherit = false;
static bool scale = true;
static bool no_aggr = false;
static pid_t target_pid = -1;
static pid_t target_tid = -1;
static pid_t child_pid = -1;
static bool null_run = false;
static int detailed_run = 0;
static bool sync_run = false;
static bool big_num = true;
static int big_num_opt = -1;
static const char *cpu_list;
static const char *csv_sep = NULL;
static bool csv_output = false;
static bool group = false;
static const char *output_name = NULL;
static FILE *output = NULL;
static int output_fd;
static volatile int done = 0;
struct stats
{
double n, mean, M2;
};
struct perf_stat {
struct stats res_stats[3];
};
static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
{
evsel->priv = zalloc(sizeof(struct perf_stat));
return evsel->priv == NULL ? -ENOMEM : 0;
}
static void perf_evsel__free_stat_priv(struct perf_evsel *evsel)
{
free(evsel->priv);
evsel->priv = NULL;
}
static void update_stats(struct stats *stats, u64 val)
{
double delta;
stats->n++;
delta = val - stats->mean;
stats->mean += delta / stats->n;
stats->M2 += delta*(val - stats->mean);
}
static double avg_stats(struct stats *stats)
{
return stats->mean;
}
/*
* http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
*
* (\Sum n_i^2) - ((\Sum n_i)^2)/n
* s^2 = -------------------------------
* n - 1
*
* http://en.wikipedia.org/wiki/Stddev
*
* The std dev of the mean is related to the std dev by:
*
* s
* s_mean = -------
* sqrt(n)
*
*/
static double stddev_stats(struct stats *stats)
{
double variance, variance_mean;
if (!stats->n)
return 0.0;
variance = stats->M2 / (stats->n - 1);
variance_mean = variance / stats->n;
return sqrt(variance_mean);
}
struct stats runtime_nsecs_stats[MAX_NR_CPUS];
struct stats runtime_cycles_stats[MAX_NR_CPUS];
struct stats runtime_stalled_cycles_front_stats[MAX_NR_CPUS];
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)
{
struct perf_event_attr *attr = &evsel->attr;
if (scale)
attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
PERF_FORMAT_TOTAL_TIME_RUNNING;
attr->inherit = !no_inherit;
if (system_wide)
return perf_evsel__open_per_cpu(evsel, evsel_list->cpus, group);
if (target_pid == -1 && target_tid == -1) {
attr->disabled = 1;
attr->enable_on_exec = 1;
}
return perf_evsel__open_per_thread(evsel, evsel_list->threads, group);
}
/*
* Does the counter have nsecs as a unit?
*/
static inline int nsec_counter(struct perf_evsel *evsel)
{
if (perf_evsel__match(evsel, SOFTWARE, SW_CPU_CLOCK) ||
perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
return 1;
return 0;
}
/*
* Update various tracking values we maintain to print
* more semantic information such as miss/hit ratios,
* instruction rates, etc:
*/
static void update_shadow_stats(struct perf_evsel *counter, u64 *count)
{
if (perf_evsel__match(counter, SOFTWARE, SW_TASK_CLOCK))
update_stats(&runtime_nsecs_stats[0], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_CPU_CYCLES))
update_stats(&runtime_cycles_stats[0], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_FRONTEND))
update_stats(&runtime_stalled_cycles_front_stats[0], count[0]);
else if (perf_evsel__match(counter, HARDWARE, HW_STALLED_CYCLES_BACKEND))
update_stats(&runtime_stalled_cycles_back_stats[0], count[0]);
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]);
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]);
}
/*
* Read out the results of a single counter:
* aggregate counts across CPUs in system-wide mode
*/
static int read_counter_aggr(struct perf_evsel *counter)
{
struct perf_stat *ps = counter->priv;
u64 *count = counter->counts->aggr.values;
int i;
if (__perf_evsel__read(counter, evsel_list->cpus->nr,
evsel_list->threads->nr, scale) < 0)
return -1;
for (i = 0; i < 3; i++)
update_stats(&ps->res_stats[i], count[i]);
if (verbose) {
fprintf(output, "%s: %" PRIu64 " %" PRIu64 " %" PRIu64 "\n",
event_name(counter), count[0], count[1], count[2]);
}
/*
* Save the full runtime - to allow normalization during printout:
*/
update_shadow_stats(counter, count);
return 0;
}
/*
* Read out the results of a single counter:
* do not aggregate counts across CPUs in system-wide mode
*/
static int read_counter(struct perf_evsel *counter)
{
u64 *count;
int cpu;
for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
if (__perf_evsel__read_on_cpu(counter, cpu, 0, scale) < 0)
return -1;
count = counter->counts->cpu[cpu].values;
update_shadow_stats(counter, count);
}
return 0;
}
static int run_perf_stat(int argc __used, const char **argv)
{
unsigned long long t0, t1;
struct perf_evsel *counter;
int status = 0;
int child_ready_pipe[2], go_pipe[2];
const bool forks = (argc > 0);
char buf;
if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
perror("failed to create pipes");
exit(1);
}
if (forks) {
if ((child_pid = fork()) < 0)
perror("failed to fork");
if (!child_pid) {
close(child_ready_pipe[0]);
close(go_pipe[1]);
fcntl(go_pipe[0], F_SETFD, FD_CLOEXEC);
/*
* Do a dummy execvp to get the PLT entry resolved,
* so we avoid the resolver overhead on the real
* execvp call.
*/
execvp("", (char **)argv);
/*
* Tell the parent we're ready to go
*/
close(child_ready_pipe[1]);
/*
* Wait until the parent tells us to go.
*/
if (read(go_pipe[0], &buf, 1) == -1)
perror("unable to read pipe");
execvp(argv[0], (char **)argv);
perror(argv[0]);
exit(-1);
}
if (target_tid == -1 && target_pid == -1 && !system_wide)
evsel_list->threads->map[0] = child_pid;
/*
* Wait for the child to be ready to exec.
*/
close(child_ready_pipe[1]);
close(go_pipe[0]);
if (read(child_ready_pipe[0], &buf, 1) == -1)
perror("unable to read pipe");
close(child_ready_pipe[0]);
}
list_for_each_entry(counter, &evsel_list->entries, node) {
if (create_perf_stat_counter(counter) < 0) {
if (errno == EINVAL || errno == ENOSYS || errno == ENOENT) {
if (verbose)
ui__warning("%s event is not supported by the kernel.\n",
event_name(counter));
counter->supported = false;
continue;
}
if (errno == EPERM || errno == EACCES) {
error("You may not have permission to collect %sstats.\n"
"\t Consider tweaking"
" /proc/sys/kernel/perf_event_paranoid or running as root.",
system_wide ? "system-wide " : "");
} else {
error("open_counter returned with %d (%s). "
"/bin/dmesg may provide additional information.\n",
errno, strerror(errno));
}
if (child_pid != -1)
kill(child_pid, SIGTERM);
die("Not all events could be opened.\n");
return -1;
}
counter->supported = true;
}
if (perf_evlist__set_filters(evsel_list)) {
error("failed to set filter with %d (%s)\n", errno,
strerror(errno));
return -1;
}
/*
* Enable counters and exec the command:
*/
t0 = rdclock();
if (forks) {
close(go_pipe[1]);
wait(&status);
if (WIFSIGNALED(status))
psignal(WTERMSIG(status), argv[0]);
} else {
while(!done) sleep(1);
}
t1 = rdclock();
update_stats(&walltime_nsecs_stats, t1 - t0);
if (no_aggr) {
list_for_each_entry(counter, &evsel_list->entries, node) {
read_counter(counter);
perf_evsel__close_fd(counter, evsel_list->cpus->nr, 1);
}
} else {
list_for_each_entry(counter, &evsel_list->entries, node) {
read_counter_aggr(counter);
perf_evsel__close_fd(counter, evsel_list->cpus->nr,
evsel_list->threads->nr);
}
}
return WEXITSTATUS(status);
}
static void print_noise_pct(double total, double avg)
{
double pct = 0.0;
if (avg)
pct = 100.0*total/avg;
if (csv_output)
fprintf(output, "%s%.2f%%", csv_sep, pct);
else if (pct)
fprintf(output, " ( +-%6.2f%% )", pct);
}
static void print_noise(struct perf_evsel *evsel, double avg)
{
struct perf_stat *ps;
if (run_count == 1)
return;
ps = evsel->priv;
print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
}
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%-25s";
if (no_aggr)
sprintf(cpustr, "CPU%*d%s",
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep);
fprintf(output, fmt, cpustr, msecs, csv_sep, event_name(evsel));
if (evsel->cgrp)
fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
if (csv_output)
return;
if (perf_evsel__match(evsel, SOFTWARE, SW_TASK_CLOCK))
fprintf(output, " # %8.3f CPUs utilized ",
avg / avg_stats(&walltime_nsecs_stats));
}
static void print_stalled_cycles_frontend(int cpu, struct perf_evsel *evsel __used, double avg)
{
double total, ratio = 0.0;
const char *color;
total = avg_stats(&runtime_cycles_stats[cpu]);
if (total)
ratio = avg / total * 100.0;
color = PERF_COLOR_NORMAL;
if (ratio > 50.0)
color = PERF_COLOR_RED;
else if (ratio > 30.0)
color = PERF_COLOR_MAGENTA;
else if (ratio > 10.0)
color = PERF_COLOR_YELLOW;
fprintf(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " frontend cycles idle ");
}
static void print_stalled_cycles_backend(int cpu, struct perf_evsel *evsel __used, double avg)
{
double total, ratio = 0.0;
const char *color;
total = avg_stats(&runtime_cycles_stats[cpu]);
if (total)
ratio = avg / total * 100.0;
color = PERF_COLOR_NORMAL;
if (ratio > 75.0)
color = PERF_COLOR_RED;
else if (ratio > 50.0)
color = PERF_COLOR_MAGENTA;
else if (ratio > 20.0)
color = PERF_COLOR_YELLOW;
fprintf(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " backend cycles idle ");
}
static void print_branch_misses(int cpu, struct perf_evsel *evsel __used, double avg)
{
double total, ratio = 0.0;
const char *color;
total = avg_stats(&runtime_branches_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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " 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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " 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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " 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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " 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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " 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(output, " # ");
color_fprintf(output, color, "%6.2f%%", ratio);
fprintf(output, " of all LL-cache hits ");
}
static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
{
double total, ratio = 0.0;
char cpustr[16] = { '\0', };
const char *fmt;
if (csv_output)
fmt = "%s%.0f%s%s";
else if (big_num)
fmt = "%s%'18.0f%s%-25s";
else
fmt = "%s%18.0f%s%-25s";
if (no_aggr)
sprintf(cpustr, "CPU%*d%s",
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep);
else
cpu = 0;
fprintf(output, fmt, cpustr, avg, csv_sep, event_name(evsel));
if (evsel->cgrp)
fprintf(output, "%s%s", csv_sep, evsel->cgrp->name);
if (csv_output)
return;
if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
total = avg_stats(&runtime_cycles_stats[cpu]);
if (total)
ratio = avg / total;
fprintf(output, " # %5.2f insns per cycle ", ratio);
total = avg_stats(&runtime_stalled_cycles_front_stats[cpu]);
total = max(total, avg_stats(&runtime_stalled_cycles_back_stats[cpu]));
if (total && avg) {
ratio = total / avg;
fprintf(output, "\n # %5.2f stalled cycles per insn", ratio);
}
} 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_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]);
if (total)
ratio = avg * 100 / total;
fprintf(output, " # %8.3f %% of all cache refs ", ratio);
} else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_FRONTEND)) {
print_stalled_cycles_frontend(cpu, evsel, avg);
} else if (perf_evsel__match(evsel, HARDWARE, HW_STALLED_CYCLES_BACKEND)) {
print_stalled_cycles_backend(cpu, evsel, avg);
} else if (perf_evsel__match(evsel, HARDWARE, HW_CPU_CYCLES)) {
total = avg_stats(&runtime_nsecs_stats[cpu]);
if (total)
ratio = 1.0 * avg / total;
fprintf(output, " # %8.3f GHz ", ratio);
} else if (runtime_nsecs_stats[cpu].n != 0) {
total = avg_stats(&runtime_nsecs_stats[cpu]);
if (total)
ratio = 1000.0 * avg / total;
fprintf(output, " # %8.3f M/sec ", ratio);
} else {
fprintf(output, " ");
}
}
/*
* Print out the results of a single counter:
* aggregated counts in system-wide mode
*/
static void print_counter_aggr(struct perf_evsel *counter)
{
struct perf_stat *ps = counter->priv;
double avg = avg_stats(&ps->res_stats[0]);
int scaled = counter->counts->scaled;
if (scaled == -1) {
fprintf(output, "%*s%s%*s",
csv_output ? 0 : 18,
counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
csv_sep,
csv_output ? 0 : -24,
event_name(counter));
if (counter->cgrp)
fprintf(output, "%s%s", csv_sep, counter->cgrp->name);
fputc('\n', output);
return;
}
if (nsec_counter(counter))
nsec_printout(-1, counter, avg);
else
abs_printout(-1, counter, avg);
print_noise(counter, avg);
if (csv_output) {
fputc('\n', output);
return;
}
if (scaled) {
double avg_enabled, avg_running;
avg_enabled = avg_stats(&ps->res_stats[1]);
avg_running = avg_stats(&ps->res_stats[2]);
fprintf(output, " [%5.2f%%]", 100 * avg_running / avg_enabled);
}
fprintf(output, "\n");
}
/*
* Print out the results of a single counter:
* does not use aggregated count in system-wide
*/
static void print_counter(struct perf_evsel *counter)
{
u64 ena, run, val;
int cpu;
for (cpu = 0; cpu < evsel_list->cpus->nr; cpu++) {
val = counter->counts->cpu[cpu].val;
ena = counter->counts->cpu[cpu].ena;
run = counter->counts->cpu[cpu].run;
if (run == 0 || ena == 0) {
fprintf(output, "CPU%*d%s%*s%s%*s",
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep,
csv_output ? 0 : 18,
counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
csv_sep,
csv_output ? 0 : -24,
event_name(counter));
if (counter->cgrp)
fprintf(output, "%s%s",
csv_sep, counter->cgrp->name);
fputc('\n', output);
continue;
}
if (nsec_counter(counter))
nsec_printout(cpu, counter, val);
else
abs_printout(cpu, counter, val);
if (!csv_output) {
print_noise(counter, 1.0);
if (run != ena)
fprintf(output, " (%.2f%%)",
100.0 * run / ena);
}
fputc('\n', output);
}
}
static void print_stat(int argc, const char **argv)
{
struct perf_evsel *counter;
int i;
fflush(stdout);
if (!csv_output) {
fprintf(output, "\n");
fprintf(output, " Performance counter stats for ");
if(target_pid == -1 && target_tid == -1) {
fprintf(output, "\'%s", argv[0]);
for (i = 1; i < argc; i++)
fprintf(output, " %s", argv[i]);
} else if (target_pid != -1)
fprintf(output, "process id \'%d", target_pid);
else
fprintf(output, "thread id \'%d", target_tid);
fprintf(output, "\'");
if (run_count > 1)
fprintf(output, " (%d runs)", run_count);
fprintf(output, ":\n\n");
}
if (no_aggr) {
list_for_each_entry(counter, &evsel_list->entries, node)
print_counter(counter);
} else {
list_for_each_entry(counter, &evsel_list->entries, node)
print_counter_aggr(counter);
}
if (!csv_output) {
if (!null_run)
fprintf(output, "\n");
fprintf(output, " %17.9f seconds time elapsed",
avg_stats(&walltime_nsecs_stats)/1e9);
if (run_count > 1) {
fprintf(output, " ");
print_noise_pct(stddev_stats(&walltime_nsecs_stats),
avg_stats(&walltime_nsecs_stats));
}
fprintf(output, "\n\n");
}
}
static volatile int signr = -1;
static void skip_signal(int signo)
{
if(child_pid == -1)
done = 1;
signr = signo;
}
static void sig_atexit(void)
{
if (child_pid != -1)
kill(child_pid, SIGTERM);
if (signr == -1)
return;
signal(signr, SIG_DFL);
kill(getpid(), signr);
}
static const char * const stat_usage[] = {
"perf stat [<options>] [<command>]",
NULL
};
static int stat__set_big_num(const struct option *opt __used,
const char *s __used, int unset)
{
big_num_opt = unset ? 0 : 1;
return 0;
}
static bool append_file;
static const struct option options[] = {
OPT_CALLBACK('e', "event", &evsel_list, "event",
"event selector. use 'perf list' to list available events",
parse_events_option),
OPT_CALLBACK(0, "filter", &evsel_list, "filter",
"event filter", parse_filter),
OPT_BOOLEAN('i', "no-inherit", &no_inherit,
"child tasks do not inherit counters"),
OPT_INTEGER('p', "pid", &target_pid,
"stat events on existing process id"),
OPT_INTEGER('t', "tid", &target_tid,
"stat events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
OPT_BOOLEAN('g', "group", &group,
"put the counters into a counter group"),
OPT_BOOLEAN('c', "scale", &scale,
"scale/normalize counters"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show counter open errors, etc)"),
OPT_INTEGER('r', "repeat", &run_count,
"repeat command and print average + stddev (max: 100)"),
OPT_BOOLEAN('n', "null", &null_run,
"null run - dont start any counters"),
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"),
OPT_CALLBACK_NOOPT('B', "big-num", NULL, NULL,
"print large numbers with thousands\' separators",
stat__set_big_num),
OPT_STRING('C', "cpu", &cpu_list, "cpu",
"list of cpus to monitor in system-wide"),
OPT_BOOLEAN('A', "no-aggr", &no_aggr,
"disable CPU count aggregation"),
OPT_STRING('x', "field-separator", &csv_sep, "separator",
"print counts with custom separator"),
OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
"monitor event in cgroup name only",
parse_cgroups),
OPT_STRING('o', "output", &output_name, "file",
"output file name"),
OPT_BOOLEAN(0, "append", &append_file, "append to the output file"),
OPT_INTEGER(0, "log-fd", &output_fd,
"log output to fd, instead of stderr"),
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;
int status = -ENOMEM;
const char *mode;
setlocale(LC_ALL, "");
evsel_list = perf_evlist__new(NULL, NULL);
if (evsel_list == NULL)
return -ENOMEM;
argc = parse_options(argc, argv, options, stat_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
output = stderr;
if (output_name && strcmp(output_name, "-"))
output = NULL;
if (output_name && output_fd) {
fprintf(stderr, "cannot use both --output and --log-fd\n");
usage_with_options(stat_usage, options);
}
if (!output) {
struct timespec tm;
mode = append_file ? "a" : "w";
output = fopen(output_name, mode);
if (!output) {
perror("failed to create output file");
exit(-1);
}
clock_gettime(CLOCK_REALTIME, &tm);
fprintf(output, "# started on %s\n", ctime(&tm.tv_sec));
} else if (output_fd != 2) {
mode = append_file ? "a" : "w";
output = fdopen(output_fd, mode);
if (!output) {
perror("Failed opening logfd");
return -errno;
}
}
if (csv_sep) {
csv_output = true;
if (!strcmp(csv_sep, "\\t"))
csv_sep = "\t";
} else
csv_sep = DEFAULT_SEPARATOR;
/*
* let the spreadsheet do the pretty-printing
*/
if (csv_output) {
/* User explicitly passed -B? */
if (big_num_opt == 1) {
fprintf(stderr, "-B option not supported with -x\n");
usage_with_options(stat_usage, options);
} else /* Nope, so disable big number formatting */
big_num = false;
} else if (big_num_opt == 0) /* User passed --no-big-num */
big_num = false;
if (!argc && target_pid == -1 && target_tid == -1)
usage_with_options(stat_usage, options);
if (run_count <= 0)
usage_with_options(stat_usage, options);
/* no_aggr, cgroup are for system-wide only */
if ((no_aggr || nr_cgroups) && !system_wide) {
fprintf(stderr, "both cgroup and no-aggregation "
"modes only available in system-wide mode\n");
usage_with_options(stat_usage, options);
}
if (add_default_attributes())
goto out;
if (target_pid != -1)
target_tid = target_pid;
evsel_list->threads = thread_map__new(target_pid, target_tid);
if (evsel_list->threads == NULL) {
pr_err("Problems finding threads of monitor\n");
usage_with_options(stat_usage, options);
}
if (system_wide)
evsel_list->cpus = cpu_map__new(cpu_list);
else
evsel_list->cpus = cpu_map__dummy_new();
if (evsel_list->cpus == NULL) {
perror("failed to parse CPUs map");
usage_with_options(stat_usage, options);
return -1;
}
list_for_each_entry(pos, &evsel_list->entries, node) {
if (perf_evsel__alloc_stat_priv(pos) < 0 ||
perf_evsel__alloc_counts(pos, evsel_list->cpus->nr) < 0 ||
perf_evsel__alloc_fd(pos, evsel_list->cpus->nr, evsel_list->threads->nr) < 0)
goto out_free_fd;
}
/*
* We dont want to block the signals - that would cause
* child tasks to inherit that and Ctrl-C would not work.
* What we want is for Ctrl-C to work in the exec()-ed
* task, but being ignored by perf stat itself:
*/
atexit(sig_atexit);
signal(SIGINT, skip_signal);
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);
status = 0;
for (run_idx = 0; run_idx < run_count; run_idx++) {
if (run_count != 1 && verbose)
fprintf(output, "[ perf stat: executing run #%d ... ]\n",
run_idx + 1);
if (sync_run)
sync();
status = run_perf_stat(argc, argv);
}
if (status != -1)
print_stat(argc, argv);
out_free_fd:
list_for_each_entry(pos, &evsel_list->entries, node)
perf_evsel__free_stat_priv(pos);
perf_evlist__delete_maps(evsel_list);
out:
perf_evlist__delete(evsel_list);
return status;
}
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