perf stat: Add per processor socket count aggregation
This patch adds per-processor socket count aggregation for system-wide
mode measurements. This is a useful mode to detect imbalance between
sockets.
To enable this mode, use --aggr-socket in addition
to -a. (system-wide).
The output includes the socket number and the number of online
processors on that socket. This is useful to gauge the amount of
aggregation.
# ./perf stat -I 1000 -a --aggr-socket -e cycles sleep 2
# time socket cpus counts events
1.000097680 S0 4 5,788,785 cycles
2.000379943 S0 4 27,361,546 cycles
2.001167808 S0 4 818,275 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/1360161962-9675-3-git-send-email-eranian@google.com
[ committer note: Added missing man page entry based on above comments ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 5289da3..faf4f4f 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -116,9 +116,16 @@
-I msecs::
--interval-print msecs::
- print count deltas every N milliseconds (minimum: 100ms)
+ Print count deltas every N milliseconds (minimum: 100ms)
example: perf stat -I 1000 -e cycles -a sleep 5
+--aggr-socket::
+Aggregate counts per processor socket for system-wide mode measurements. This
+is a useful mode to detect imbalance between sockets. To enable this mode,
+use --aggr-socket in addition to -a. (system-wide). The output includes the
+socket number and the number of online processors on that socket. This is
+useful to gauge the amount of aggregation.
+
EXAMPLES
--------
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 0368a10..9984876 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -68,6 +68,7 @@
static void print_stat(int argc, const char **argv);
static void print_counter_aggr(struct perf_evsel *counter, char *prefix);
static void print_counter(struct perf_evsel *counter, char *prefix);
+static void print_aggr_socket(char *prefix);
static struct perf_evlist *evsel_list;
@@ -79,6 +80,7 @@
static bool no_inherit = false;
static bool scale = true;
static bool no_aggr = false;
+static bool aggr_socket = false;
static pid_t child_pid = -1;
static bool null_run = false;
static int detailed_run = 0;
@@ -93,6 +95,7 @@
static bool sync_run = false;
static unsigned int interval = 0;
static struct timespec ref_time;
+static struct cpu_map *sock_map;
static volatile int done = 0;
@@ -312,7 +315,9 @@
sprintf(prefix, "%6lu.%09lu%s", rs.tv_sec, rs.tv_nsec, csv_sep);
if (num_print_interval == 0 && !csv_output) {
- if (no_aggr)
+ if (aggr_socket)
+ fprintf(output, "# time socket cpus counts events\n");
+ else if (no_aggr)
fprintf(output, "# time CPU counts events\n");
else
fprintf(output, "# time counts events\n");
@@ -321,7 +326,9 @@
if (++num_print_interval == 25)
num_print_interval = 0;
- if (no_aggr) {
+ if (aggr_socket)
+ print_aggr_socket(prefix);
+ else if (no_aggr) {
list_for_each_entry(counter, &evsel_list->entries, node)
print_counter(counter, prefix);
} else {
@@ -349,6 +356,12 @@
ts.tv_nsec = 0;
}
+ if (aggr_socket
+ && cpu_map__build_socket_map(evsel_list->cpus, &sock_map)) {
+ perror("cannot build socket map");
+ return -1;
+ }
+
if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
perror("failed to create pipes");
return -1;
@@ -529,13 +542,21 @@
print_noise_pct(stddev_stats(&ps->res_stats[0]), avg);
}
-static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
+static void nsec_printout(int cpu, int nr, 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)
+ if (aggr_socket)
+ sprintf(cpustr, "S%*d%s%*d%s",
+ csv_output ? 0 : -5,
+ cpu,
+ csv_sep,
+ csv_output ? 0 : 4,
+ nr,
+ csv_sep);
+ else if (no_aggr)
sprintf(cpustr, "CPU%*d%s",
csv_output ? 0 : -4,
perf_evsel__cpus(evsel)->map[cpu], csv_sep);
@@ -734,7 +755,7 @@
fprintf(output, " of all LL-cache hits ");
}
-static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
+static void abs_printout(int cpu, int nr, struct perf_evsel *evsel, double avg)
{
double total, ratio = 0.0;
char cpustr[16] = { '\0', };
@@ -747,7 +768,15 @@
else
fmt = "%s%18.0f%s%-25s";
- if (no_aggr)
+ if (aggr_socket)
+ sprintf(cpustr, "S%*d%s%*d%s",
+ csv_output ? 0 : -5,
+ cpu,
+ csv_sep,
+ csv_output ? 0 : 4,
+ nr,
+ csv_sep);
+ else if (no_aggr)
sprintf(cpustr, "CPU%*d%s",
csv_output ? 0 : -4,
perf_evsel__cpus(evsel)->map[cpu], csv_sep);
@@ -853,6 +882,70 @@
}
}
+static void print_aggr_socket(char *prefix)
+{
+ struct perf_evsel *counter;
+ u64 ena, run, val;
+ int cpu, s, s2, sock, nr;
+
+ if (!sock_map)
+ return;
+
+ for (s = 0; s < sock_map->nr; s++) {
+ sock = cpu_map__socket(sock_map, s);
+ list_for_each_entry(counter, &evsel_list->entries, node) {
+ val = ena = run = 0;
+ nr = 0;
+ for (cpu = 0; cpu < perf_evsel__nr_cpus(counter); cpu++) {
+ s2 = cpu_map__get_socket(evsel_list->cpus, cpu);
+ if (s2 != sock)
+ continue;
+ val += counter->counts->cpu[cpu].val;
+ ena += counter->counts->cpu[cpu].ena;
+ run += counter->counts->cpu[cpu].run;
+ nr++;
+ }
+ if (prefix)
+ fprintf(output, "%s", prefix);
+
+ if (run == 0 || ena == 0) {
+ fprintf(output, "S%*d%s%*d%s%*s%s%*s",
+ csv_output ? 0 : -5,
+ s,
+ csv_sep,
+ csv_output ? 0 : 4,
+ nr,
+ csv_sep,
+ csv_output ? 0 : 18,
+ counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
+ csv_sep,
+ csv_output ? 0 : -24,
+ perf_evsel__name(counter));
+ if (counter->cgrp)
+ fprintf(output, "%s%s",
+ csv_sep, counter->cgrp->name);
+
+ fputc('\n', output);
+ continue;
+ }
+
+ if (nsec_counter(counter))
+ nsec_printout(sock, nr, counter, val);
+ else
+ abs_printout(sock, nr, counter, val);
+
+ if (!csv_output) {
+ print_noise(counter, 1.0);
+
+ if (run != ena)
+ fprintf(output, " (%.2f%%)",
+ 100.0 * run / ena);
+ }
+ fputc('\n', output);
+ }
+ }
+}
+
/*
* Print out the results of a single counter:
* aggregated counts in system-wide mode
@@ -882,9 +975,9 @@
}
if (nsec_counter(counter))
- nsec_printout(-1, counter, avg);
+ nsec_printout(-1, 0, counter, avg);
else
- abs_printout(-1, counter, avg);
+ abs_printout(-1, 0, counter, avg);
print_noise(counter, avg);
@@ -940,9 +1033,9 @@
}
if (nsec_counter(counter))
- nsec_printout(cpu, counter, val);
+ nsec_printout(cpu, 0, counter, val);
else
- abs_printout(cpu, counter, val);
+ abs_printout(cpu, 0, counter, val);
if (!csv_output) {
print_noise(counter, 1.0);
@@ -980,7 +1073,9 @@
fprintf(output, ":\n\n");
}
- if (no_aggr) {
+ if (aggr_socket)
+ print_aggr_socket(NULL);
+ else if (no_aggr) {
list_for_each_entry(counter, &evsel_list->entries, node)
print_counter(counter, NULL);
} else {
@@ -1228,6 +1323,7 @@
"command to run after to the measured command"),
OPT_UINTEGER('I', "interval-print", &interval,
"print counts at regular interval in ms (>= 100)"),
+ OPT_BOOLEAN(0, "aggr-socket", &aggr_socket, "aggregate counts per processor socket"),
OPT_END()
};
const char * const stat_usage[] = {
@@ -1314,6 +1410,14 @@
usage_with_options(stat_usage, options);
}
+ if (aggr_socket) {
+ if (!perf_target__has_cpu(&target)) {
+ fprintf(stderr, "--aggr-socket only available in system-wide mode (-a)\n");
+ usage_with_options(stat_usage, options);
+ }
+ no_aggr = true;
+ }
+
if (add_default_attributes())
goto out;