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>
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 7bb8e87..beb8cf9 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -267,7 +267,53 @@
return 0;
}
+int cpu_map__get_core(struct cpu_map *map, int idx)
+{
+ FILE *fp;
+ const char *mnt;
+ char path[PATH_MAX];
+ int cpu, ret, s;
+
+ if (idx > map->nr)
+ return -1;
+
+ cpu = map->map[idx];
+
+ mnt = sysfs_find_mountpoint();
+ if (!mnt)
+ return -1;
+
+ snprintf(path, PATH_MAX,
+ "%s/devices/system/cpu/cpu%d/topology/core_id",
+ mnt, cpu);
+
+ fp = fopen(path, "r");
+ if (!fp)
+ return -1;
+ ret = fscanf(fp, "%d", &cpu);
+ fclose(fp);
+ if (ret != 1)
+ return -1;
+
+ s = cpu_map__get_socket(map, idx);
+ if (s == -1)
+ return -1;
+
+ /*
+ * encode socket in upper 16 bits
+ * core_id is relative to socket, and
+ * we need a global id. So we combine
+ * socket+ core id
+ */
+ return (s << 16) | (cpu & 0xffff);
+}
+
int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
{
return cpu_map__build_map(cpus, sockp, cpu_map__get_socket);
}
+
+int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
+{
+ return cpu_map__build_map(cpus, corep, cpu_map__get_core);
+}