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perf cpu_map: Add cpu_map__empty_new function

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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 <[email protected]>
Tested-by: Kan Liang <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Jiri Olsa 2015-10-25 15:51:17 +01:00 • committed by Arnaldo Carvalho de Melo
commit 2322f573f8
2 changed files with 18 additions and 0 deletions
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17
tools/perf/util/cpumap.c
View file

@ -203,6 +203,23 @@ struct cpu_map *cpu_map__dummy_new(void)
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) {

1
tools/perf/util/cpumap.h
View file

@ -15,6 +15,7 @@ struct cpu_map {
};
struct cpu_map *cpu_map__new(const char *cpu_list);
struct cpu_map *cpu_map__empty_new(int nr);
struct cpu_map *cpu_map__dummy_new(void);
struct cpu_map *cpu_map__read(FILE *file);
size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);