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Subject[PATCH 1/2] perf tools: add cpu_map__get_socket()
Date
To get the socket number associated with a CPU.
Useful for uncore output.

Signed-off-by: Stephane Eranian <eranian@google.com>
---
tools/perf/util/cpumap.c | 26 ++++++++++++++++++++++++++
tools/perf/util/cpumap.h | 1 +
2 files changed, 27 insertions(+)

diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 2b32ffa..adb2e9c 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -1,4 +1,5 @@
#include "util.h"
+#include "sysfs.h"
#include "../perf.h"
#include "cpumap.h"
#include <assert.h>
@@ -201,3 +202,28 @@ void cpu_map__delete(struct cpu_map *map)
{
free(map);
}
+
+int cpu_map__get_socket(struct cpu_map *map, int idx)
+{
+ FILE *fp;
+ char path[PATH_MAX];
+ const char *sysfs;
+ int cpu, ret;
+
+ if (idx > map->nr)
+ return -1;
+
+ cpu = map->map[idx];
+
+ sysfs = sysfs_find_mountpoint();
+ if (!sysfs)
+ return -1;
+
+ sprintf(path, "%s/devices/system/cpu/cpu%d/topology/physical_package_id", sysfs, cpu);
+ fp = fopen(path, "r");
+ if (!fp)
+ return -1;
+ ret = fscanf(fp, "%d", &cpu);
+ fclose(fp);
+ return ret == 1 ? cpu : -1;
+}
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 2f68a3b..0178e49 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -14,6 +14,7 @@ struct cpu_map *cpu_map__dummy_new(void);
void cpu_map__delete(struct cpu_map *map);
struct cpu_map *cpu_map__read(FILE *file);
size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);
+int cpu_map__get_socket(struct cpu_map *map, int idx);

static inline int cpu_map__nr(const struct cpu_map *map)
{
--
1.7.10.4


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