Messages in this thread Patch in this message | | | From | Mark Rutland <> | Subject | [RFC PATCH 2/3] perf: util: Add more cpu_map helpers | Date | Thu, 7 Jul 2016 17:04:33 +0100 |
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In some cases it's necessry to figure out the map-local index of a given Linux logical CPU ID. Add a new helper, cpu_map__idx, to acquire this. As the logic is largely the same as the existing cpu_map__has, this is rewritten in terms of the new helper.
At the same time, add the inverse operation, cpu_map__cpu, which yields the logical CPU id for a map-local index. While this can be performed manually, wrapping this in a helper can make code more legible.
Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org --- tools/perf/util/cpumap.c | 14 ++++++++++++-- tools/perf/util/cpumap.h | 2 ++ 2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c index 02d8016..efc88fe 100644 --- a/tools/perf/util/cpumap.c +++ b/tools/perf/util/cpumap.c @@ -590,12 +590,22 @@ int cpu__setup_cpunode_map(void) bool cpu_map__has(struct cpu_map *cpus, int cpu) { + return cpu_map__idx(cpus, cpu) != -1; +} + +int cpu_map__idx(struct cpu_map *cpus, int cpu) +{ int i; for (i = 0; i < cpus->nr; ++i) { if (cpus->map[i] == cpu) - return true; + return i; } - return false; + return -1; +} + +int cpu_map__cpu(struct cpu_map *cpus, int idx) +{ + return cpus->map[idx]; } diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h index 1a0a350..46f7642 100644 --- a/tools/perf/util/cpumap.h +++ b/tools/perf/util/cpumap.h @@ -67,5 +67,7 @@ int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, int (*f)(struct cpu_map *map, int cpu, void *data), void *data); +int cpu_map__cpu(struct cpu_map *cpus, int idx); bool cpu_map__has(struct cpu_map *cpus, int cpu); +int cpu_map__idx(struct cpu_map *cpus, int cpu); #endif /* __PERF_CPUMAP_H */ -- 1.9.1
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