perf stat: Check PMU cpumask file

If user doesn't explicitly specify CPU list, perf-stat only collects
events on CPUs listed in the PMU cpumask file.

Signed-off-by: "Yah, Zheng" <zheng.z.yan@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1347263631-23175-3-git-send-email-zheng.z.yan@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 6631d828db3d..8a2229da594f 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -9,6 +9,7 @@
 #include "util.h"
 #include "pmu.h"
 #include "parse-events.h"
+#include "cpumap.h"
 
 #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
 
@@ -253,6 +254,33 @@ static void pmu_read_sysfs(void)
         closedir(dir);
 }
 
+static struct cpu_map *pmu_cpumask(char *name)
+{
+        struct stat st;
+        char path[PATH_MAX];
+        const char *sysfs;
+        FILE *file;
+        struct cpu_map *cpus;
+
+        sysfs = sysfs_find_mountpoint();
+        if (!sysfs)
+                return NULL;
+
+        snprintf(path, PATH_MAX,
+                 "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
+
+        if (stat(path, &st) < 0)
+                return NULL;
+
+        file = fopen(path, "r");
+        if (!file)
+                return NULL;
+
+        cpus = cpu_map__read(file);
+        fclose(file);
+        return cpus;
+}
+
 static struct perf_pmu *pmu_lookup(char *name)
 {
         struct perf_pmu *pmu;
@@ -275,6 +303,8 @@ static struct perf_pmu *pmu_lookup(char *name)
         if (!pmu)
                 return NULL;
 
+        pmu->cpus = pmu_cpumask(name);
+
         pmu_aliases(name, &aliases);
 
         INIT_LIST_HEAD(&pmu->format);