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>
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@ -203,6 +203,23 @@ struct cpu_map *cpu_map__dummy_new(void)
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return cpus;
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}
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struct cpu_map *cpu_map__empty_new(int nr)
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{
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struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
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if (cpus != NULL) {
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int i;
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cpus->nr = nr;
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for (i = 0; i < nr; i++)
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cpus->map[i] = -1;
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atomic_set(&cpus->refcnt, 1);
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}
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return cpus;
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}
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static void cpu_map__delete(struct cpu_map *map)
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{
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if (map) {
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@ -15,6 +15,7 @@ struct cpu_map {
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};
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struct cpu_map *cpu_map__new(const char *cpu_list);
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struct cpu_map *cpu_map__empty_new(int nr);
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struct cpu_map *cpu_map__dummy_new(void);
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struct cpu_map *cpu_map__read(FILE *file);
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size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp);
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