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perf stat: Allocate shadow stats buffer for threads

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After perf_evlist__create_maps() being executed, we can get all threads
from /proc. And via thread_map__nr(), we can also get the number of
threads.

With the number of threads, the patch allocates a buffer which will
record the shadow stats for these threads.

The buffer pointer is saved in stat_config.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1512482591-4646-8-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2017-12-05 22:03:07 +08:00 committed by Arnaldo Carvalho de Melo
parent 6a1e2c5c26
commit 56739444d8
2 changed files with 47 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

46
tools/perf/builtin-stat.c
View file

@ -214,8 +214,13 @@ static inline void diff_timespec(struct timespec *r, struct timespec *a,
static void perf_stat__reset_stats(void)
{
int i;
perf_evlist__reset_stats(evsel_list);
perf_stat__reset_shadow_stats();
for (i = 0; i < stat_config.stats_num; i++)
perf_stat__reset_shadow_per_stat(&stat_config.stats[i]);
}
static int create_perf_stat_counter(struct perf_evsel *evsel)
@ -2495,6 +2500,35 @@ int process_cpu_map_event(struct perf_tool *tool,
return set_maps(st);
}
static int runtime_stat_new(struct perf_stat_config *config, int nthreads)
{
int i;
config->stats = calloc(nthreads, sizeof(struct runtime_stat));
if (!config->stats)
return -1;
config->stats_num = nthreads;
for (i = 0; i < nthreads; i++)
runtime_stat__init(&config->stats[i]);
return 0;
}
static void runtime_stat_delete(struct perf_stat_config *config)
{
int i;
if (!config->stats)
return;
for (i = 0; i < config->stats_num; i++)
runtime_stat__exit(&config->stats[i]);
free(config->stats);
}
static const char * const stat_report_usage[] = {
"perf stat report [<options>]",
NULL,
@ -2750,8 +2784,15 @@ int cmd_stat(int argc, const char **argv)
* Initialize thread_map with comm names,
* so we could print it out on output.
*/
if (stat_config.aggr_mode == AGGR_THREAD)
if (stat_config.aggr_mode == AGGR_THREAD) {
thread_map__read_comms(evsel_list->threads);
if (target.system_wide) {
if (runtime_stat_new(&stat_config,
thread_map__nr(evsel_list->threads))) {
goto out;
}
}
}
if (interval && interval < 100) {
if (interval < 10) {
@ -2841,5 +2882,8 @@ int cmd_stat(int argc, const char **argv)
sysfs__write_int(FREEZE_ON_SMI_PATH, 0);
perf_evlist__delete(evsel_list);
runtime_stat_delete(&stat_config);
return status;
}

2
tools/perf/util/stat.h
View file

@ -90,6 +90,8 @@ struct perf_stat_config {
bool scale;
FILE *output;
unsigned int interval;
struct runtime_stat *stats;
int stats_num;
};
void update_stats(struct stats *stats, u64 val);