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perf stat: Introduce --repeat forever

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The following patch causes 'perf stat --repeat 0' to be interpreted as
'forever', displaying the stats for every run.

We act as if a single run was asked, and reset the stats in each
iteration. In this mode SIGINT is passed to perf to be able to stop the
loop with Ctrl+C.

Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20130301180227.GA24385@ks398093.ip-192-95-24.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Frederik Deweerdt 2013-03-01 13:02:27 -05:00 committed by Arnaldo Carvalho de Melo
parent d723a55096
commit a7e191c376
4 changed files with 48 additions and 6 deletions
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2
tools/perf/Documentation/perf-stat.txt
View File

@ -52,7 +52,7 @@ OPTIONS
-r::
--repeat=<n>::
repeat command and print average + stddev (max: 100)
repeat command and print average + stddev (max: 100). 0 means forever.
-B::
--big-num::

45
tools/perf/builtin-stat.c
View File

@ -94,6 +94,7 @@ static const char *pre_cmd = NULL;
static const char *post_cmd = NULL;
static bool sync_run = false;
static unsigned int interval = 0;
static bool forever = false;
static struct timespec ref_time;
static struct cpu_map *sock_map;
@ -125,6 +126,11 @@ static inline int perf_evsel__nr_cpus(struct perf_evsel *evsel)
return perf_evsel__cpus(evsel)->nr;
}
static void perf_evsel__reset_stat_priv(struct perf_evsel *evsel)
{
memset(evsel->priv, 0, sizeof(struct perf_stat));
}
static int perf_evsel__alloc_stat_priv(struct perf_evsel *evsel)
{
evsel->priv = zalloc(sizeof(struct perf_stat));
@ -173,6 +179,22 @@ static struct stats runtime_itlb_cache_stats[MAX_NR_CPUS];
static struct stats runtime_dtlb_cache_stats[MAX_NR_CPUS];
static struct stats walltime_nsecs_stats;
static void reset_stats(void)
{
memset(runtime_nsecs_stats, 0, sizeof(runtime_nsecs_stats));
memset(runtime_cycles_stats, 0, sizeof(runtime_cycles_stats));
memset(runtime_stalled_cycles_front_stats, 0, sizeof(runtime_stalled_cycles_front_stats));
memset(runtime_stalled_cycles_back_stats, 0, sizeof(runtime_stalled_cycles_back_stats));
memset(runtime_branches_stats, 0, sizeof(runtime_branches_stats));
memset(runtime_cacherefs_stats, 0, sizeof(runtime_cacherefs_stats));
memset(runtime_l1_dcache_stats, 0, sizeof(runtime_l1_dcache_stats));
memset(runtime_l1_icache_stats, 0, sizeof(runtime_l1_icache_stats));
memset(runtime_ll_cache_stats, 0, sizeof(runtime_ll_cache_stats));
memset(runtime_itlb_cache_stats, 0, sizeof(runtime_itlb_cache_stats));
memset(runtime_dtlb_cache_stats, 0, sizeof(runtime_dtlb_cache_stats));
memset(&walltime_nsecs_stats, 0, sizeof(walltime_nsecs_stats));
}
static int create_perf_stat_counter(struct perf_evsel *evsel)
{
struct perf_event_attr *attr = &evsel->attr;
@ -1252,7 +1274,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
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)"),
"repeat command and print average + stddev (max: 100, forever: 0)"),
OPT_BOOLEAN('n', "null", &null_run,
"null run - dont start any counters"),
OPT_INCR('d', "detailed", &detailed_run,
@ -1355,8 +1377,12 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
if (!argc && !perf_target__has_task(&target))
usage_with_options(stat_usage, options);
if (run_count <= 0)
if (run_count < 0) {
usage_with_options(stat_usage, options);
} else if (run_count == 0) {
forever = true;
run_count = 1;
}
/* no_aggr, cgroup are for system-wide only */
if ((no_aggr || nr_cgroups) && !perf_target__has_cpu(&target)) {
@ -1413,21 +1439,30 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
* task, but being ignored by perf stat itself:
*/
atexit(sig_atexit);
signal(SIGINT, skip_signal);
if (!forever)
signal(SIGINT, skip_signal);
signal(SIGCHLD, skip_signal);
signal(SIGALRM, skip_signal);
signal(SIGABRT, skip_signal);
status = 0;
for (run_idx = 0; run_idx < run_count; run_idx++) {
for (run_idx = 0; forever || run_idx < run_count; run_idx++) {
if (run_count != 1 && verbose)
fprintf(output, "[ perf stat: executing run #%d ... ]\n",
run_idx + 1);
status = run_perf_stat(argc, argv);
if (forever && status != -1) {
print_stat(argc, argv);
list_for_each_entry(pos, &evsel_list->entries, node) {
perf_evsel__reset_stat_priv(pos);
perf_evsel__reset_counts(pos, perf_evsel__nr_cpus(pos));
}
reset_stats();
}
}
if (status != -1 && !interval)
if (!forever && status != -1 && !interval)
print_stat(argc, argv);
out_free_fd:
list_for_each_entry(pos, &evsel_list->entries, node) {

6
tools/perf/util/evsel.c
View File

@ -633,6 +633,12 @@ int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads)
return 0;
}
void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus)
{
memset(evsel->counts, 0, (sizeof(*evsel->counts) +
(ncpus * sizeof(struct perf_counts_values))));
}
int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus)
{
evsel->counts = zalloc((sizeof(*evsel->counts) +

1
tools/perf/util/evsel.h
View File

@ -121,6 +121,7 @@ int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size);
int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads);
int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
int perf_evsel__alloc_counts(struct perf_evsel *evsel, int ncpus);
void perf_evsel__reset_counts(struct perf_evsel *evsel, int ncpus);
void perf_evsel__free_fd(struct perf_evsel *evsel);
void perf_evsel__free_id(struct perf_evsel *evsel);
void perf_evsel__free_counts(struct perf_evsel *evsel);