perf cpu_map: Add cpu_map__empty_new function
Adding cpu_map__empty_new interface to create empty cpumap with given
size. The cpumap entries are initialized with -1.
It'll be used for caching cpu_map in following patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1445784728-21732-2-git-send-email-jolsa@kernel.org
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 aa6b490..10af1e7 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -203,6 +203,23 @@
return cpus;
}
+struct cpu_map *cpu_map__empty_new(int nr)
+{
+ struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
+
+ if (cpus != NULL) {
+ int i;
+
+ cpus->nr = nr;
+ for (i = 0; i < nr; i++)
+ cpus->map[i] = -1;
+
+ atomic_set(&cpus->refcnt, 1);
+ }
+
+ return cpus;
+}
+
static void cpu_map__delete(struct cpu_map *map)
{
if (map) {