From 9cecca325ea879c84fcd31a5e609a514c1a1dbd1 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Tue, 22 May 2018 13:54:32 +0300 Subject: perf machine: Add nr_cpus_avail() Add a function to return the number of the machine's available CPUs. Signed-off-by: Adrian Hunter Cc: Alexander Shishkin Cc: Andi Kleen Cc: Andy Lutomirski Cc: Dave Hansen Cc: H. Peter Anvin Cc: Jiri Olsa Cc: Joerg Roedel Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: x86@kernel.org Link: http://lkml.kernel.org/r/1526986485-6562-5-git-send-email-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/env.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'tools/perf/util/env.c') diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 319fb0a0d05e..59f38c7693f8 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -106,11 +106,24 @@ static int perf_env__read_arch(struct perf_env *env) return env->arch ? 0 : -ENOMEM; } +static int perf_env__read_nr_cpus_avail(struct perf_env *env) +{ + if (env->nr_cpus_avail == 0) + env->nr_cpus_avail = cpu__max_present_cpu(); + + return env->nr_cpus_avail ? 0 : -ENOENT; +} + const char *perf_env__raw_arch(struct perf_env *env) { return env && !perf_env__read_arch(env) ? env->arch : "unknown"; } +int perf_env__nr_cpus_avail(struct perf_env *env) +{ + return env && !perf_env__read_nr_cpus_avail(env) ? env->nr_cpus_avail : 0; +} + void cpu_cache_level__free(struct cpu_cache_level *cache) { free(cache->type); -- cgit v1.2.3-59-g8ed1b