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perf header: Replace MAX_NR_CPUS with cpu__max_cpu() 

The function cpu__max_cpu() returns the possible number of CPUs as
defined in the sysfs and can be used as an alternative for MAX_NR_CPUS
in write_cache.

MAX_CACHES is replaced by cpu__max_cpu() * MAX_CACHE_LVL.

Signed-off-by: Kyle Meyer <kyle.meyer@hpe.com>
Reviewed-by: Jiri Olsa <jolsa@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Link: http://lore.kernel.org/lkml/20190827214352.94272-7-meyerk@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kyle Meyer 2019-08-27 16:43:51 -05:00 committed by Arnaldo Carvalho de Melo
parent 8c7274691f
commit dc84187f32
1 changed files with 4 additions and 3 deletions
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7
tools/perf/util/header.c
View File

@ -1122,16 +1122,17 @@ static int build_caches(struct cpu_cache_level caches[], u32 size, u32 *cntp)
return 0;
}
#define MAX_CACHES (MAX_NR_CPUS * 4)
#define MAX_CACHE_LVL 4
static int write_cache(struct feat_fd *ff,
struct evlist *evlist __maybe_unused)
{
struct cpu_cache_level caches[MAX_CACHES];
u32 max_caches = cpu__max_cpu() * MAX_CACHE_LVL;
struct cpu_cache_level caches[max_caches];
u32 cnt = 0, i, version = 1;
int ret;
ret = build_caches(caches, MAX_CACHES, &cnt);
ret = build_caches(caches, max_caches, &cnt);
if (ret)
goto out;