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perf cpumap: Compute mask size in constant time

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perf_cpu_map__max() computes the cpumap's maximum value, no need to
iterate over all values.

Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Colin Ian King <colin.king@intel.com>
Cc: Dave Marchevsky <davemarchevsky@fb.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Kees Kook <keescook@chromium.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Riccardo Mancini <rickyman7@gmail.com>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20220614143353.1559597-4-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2022-06-14 07:33:50 -07:00 committed by Arnaldo Carvalho de Melo
parent 35ae6f09d8
commit 28526478cc
1 changed files with 1 additions and 12 deletions
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13
tools/perf/util/synthetic-events.c
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@ -1214,18 +1214,7 @@ static size_t cpus_size(const struct perf_cpu_map *map)
static size_t mask_size(const struct perf_cpu_map *map, int *max)
{
int i;
*max = 0;
for (i = 0; i < perf_cpu_map__nr(map); i++) {
/* bit position of the cpu is + 1 */
int bit = perf_cpu_map__cpu(map, i).cpu + 1;
if (bit > *max)
*max = bit;
}
*max = perf_cpu_map__max(map).cpu;
return sizeof(struct perf_record_record_cpu_map) + BITS_TO_LONGS(*max) * sizeof(long);
}