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author | Yan, Zheng <zheng.z.yan@intel.com> | 2012-09-10 15:53:50 +0800 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-09-17 13:12:02 -0300 |
commit | 7ae92e744e3fb389afb1e24920ecda331d360c61 (patch) | |
tree | 46c5d4616a003011a1237ed8d31592a662cf9720 /tools/perf/util/pmu.c | |
parent | 314d9f63f385096580e9e2a06eaa0745d92fe4ac (diff) | |
download | linux-3.10-7ae92e744e3fb389afb1e24920ecda331d360c61.tar.gz linux-3.10-7ae92e744e3fb389afb1e24920ecda331d360c61.tar.bz2 linux-3.10-7ae92e744e3fb389afb1e24920ecda331d360c61.zip |
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>
Diffstat (limited to 'tools/perf/util/pmu.c')
-rw-r--r-- | tools/perf/util/pmu.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c index 6631d828db3..8a2229da594 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); |