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authorStephane Eranian <eranian@gmail.com>2013-02-14 13:57:29 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-03-25 16:13:26 -0300
commit12c08a9f591aeda57fb3b05897169e7da5439a79 (patch)
tree4301499861ad5167139beaf6596b721badebe119 /tools/perf/builtin-stat.c
parentd4304958a25414a6e67b8a41c0f230e05cafafb6 (diff)
perf stat: Add per-core aggregation
This patch adds the --per-core option to perf stat. This option is used to aggregate system-wide counts on a per physical core basis. On processors with hyperthreading, this means counts of all HT threads running on a physical core are aggregated. This mode is useful to find imblance between physical cores running an uniform workload. Cores are identified by socket: S0-C1, means physical core 1 on socket 0. Note that cores are identified using their physical core id, thus their numbering may not be continuous. Per core aggregation can be combined with interval printing: # perf stat -a --per-core -I 1000 -e cycles sleep 1000 # time core cpus counts events 1.000090030 S0-C0 1 4,765,747 cycles 1.000090030 S0-C1 1 5,580,647 cycles 1.000090030 S0-C2 1 221,181 cycles 1.000090030 S0-C3 1 266,092 cycles Signed-off-by: Stephane Eranian <eranian@google.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1360846649-6411-4-git-send-email-eranian@google.com [ committer note: Remove parts already applied on 86ee6e1 to keep bisectability ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
-rw-r--r--tools/perf/builtin-stat.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 6f6ea931ab76..7e910bab1097 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -80,6 +80,7 @@ enum aggr_mode {
AGGR_NONE,
AGGR_GLOBAL,
AGGR_SOCKET,
+ AGGR_CORE,
};
static int run_count = 1;
@@ -384,6 +385,9 @@ static void print_interval(void)
case AGGR_SOCKET:
fprintf(output, "# time socket cpus counts events\n");
break;
+ case AGGR_CORE:
+ fprintf(output, "# time core cpus counts events\n");
+ break;
case AGGR_NONE:
fprintf(output, "# time CPU counts events\n");
break;
@@ -397,6 +401,7 @@ static void print_interval(void)
num_print_interval = 0;
switch (aggr_mode) {
+ case AGGR_CORE:
case AGGR_SOCKET:
print_aggr(prefix);
break;
@@ -566,13 +571,23 @@ static void print_noise(struct perf_evsel *evsel, double avg)
print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
}
-static void aggr_printout(struct perf_evsel *evsel, int cpu, int nr)
+static void aggr_printout(struct perf_evsel *evsel, int id, int nr)
{
switch (aggr_mode) {
+ case AGGR_CORE:
+ fprintf(output, "S%d-C%*d%s%*d%s",
+ cpu_map__id_to_socket(id),
+ csv_output ? 0 : -8,
+ cpu_map__id_to_cpu(id),
+ csv_sep,
+ csv_output ? 0 : 4,
+ nr,
+ csv_sep);
+ break;
case AGGR_SOCKET:
fprintf(output, "S%*d%s%*d%s",
csv_output ? 0 : -5,
- cpu,
+ id,
csv_sep,
csv_output ? 0 : 4,
nr,
@@ -581,7 +596,7 @@ static void aggr_printout(struct perf_evsel *evsel, int cpu, int nr)
case AGGR_NONE:
fprintf(output, "CPU%*d%s",
csv_output ? 0 : -4,
- perf_evsel__cpus(evsel)->map[cpu], csv_sep);
+ perf_evsel__cpus(evsel)->map[id], csv_sep);
break;
case AGGR_GLOBAL:
default:
@@ -1095,6 +1110,7 @@ static void print_stat(int argc, const char **argv)
}
switch (aggr_mode) {
+ case AGGR_CORE:
case AGGR_SOCKET:
print_aggr(NULL);
break;
@@ -1163,6 +1179,13 @@ static int perf_stat_init_aggr_mode(void)
}
aggr_get_id = cpu_map__get_socket;
break;
+ case AGGR_CORE:
+ if (cpu_map__build_core_map(evsel_list->cpus, &aggr_map)) {
+ perror("cannot build core map");
+ return -1;
+ }
+ aggr_get_id = cpu_map__get_core;
+ break;
case AGGR_NONE:
case AGGR_GLOBAL:
default:
@@ -1372,6 +1395,8 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
"print counts at regular interval in ms (>= 100)"),
OPT_SET_UINT(0, "per-socket", &aggr_mode,
"aggregate counts per processor socket", AGGR_SOCKET),
+ OPT_SET_UINT(0, "per-core", &aggr_mode,
+ "aggregate counts per physical processor core", AGGR_CORE),
OPT_END()
};
const char * const stat_usage[] = {