Commit 9a6c582d authored Jul 15, 2016 by Mark Rutland Committed by Arnaldo Carvalho de Melo Jul 18, 2016

perf cpu_map: Add more helpers



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>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: He Kuang <hekuang@huawei.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1468577293-19667-3-git-send-email-mark.rutland@arm.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 00e727bb

tools/perf/util/cpumap.c

+12 −2

Original line number	Diff line number	Diff line
		@@ -588,15 +588,25 @@ 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];
		}

		size_t cpu_map__snprint(struct cpu_map map, char buf, size_t size)

tools/perf/util/cpumap.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -68,5 +68,7 @@ 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 */

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