4.14-stable review patch. If anyone has any objections, please let me know. ------------------ commit 9cecca325ea879c84fcd31a5e609a514c1a1dbd1 upstream. Add a function to return the number of the machine's available CPUs. Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Joerg Roedel <joro@xxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: x86@xxxxxxxxxx Link: http://lkml.kernel.org/r/1526986485-6562-5-git-send-email-adrian.hunter@xxxxxxxxx Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- tools/perf/util/env.c | 13 +++++++++++++ tools/perf/util/env.h | 1 + tools/perf/util/machine.c | 5 +++++ tools/perf/util/machine.h | 1 + 4 files changed, 20 insertions(+) diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 49f58921a968..b492cb974aa0 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -101,11 +101,24 @@ 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); diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index bd3869913907..9aace8452751 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -67,5 +67,6 @@ int perf_env__read_cpu_topology_map(struct perf_env *env); void cpu_cache_level__free(struct cpu_cache_level *cache); const char *perf_env__raw_arch(struct perf_env *env); +int perf_env__nr_cpus_avail(struct perf_env *env); #endif /* __PERF_ENV_H */ diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c index af18c3d55642..78aa1c5f19ca 100644 --- a/tools/perf/util/machine.c +++ b/tools/perf/util/machine.c @@ -2247,6 +2247,11 @@ bool machine__is(struct machine *machine, const char *arch) return machine && !strcmp(perf_env__raw_arch(machine->env), arch); } +int machine__nr_cpus_avail(struct machine *machine) +{ + return machine ? perf_env__nr_cpus_avail(machine->env) : 0; +} + int machine__get_kernel_start(struct machine *machine) { struct map *map = machine__kernel_map(machine); diff --git a/tools/perf/util/machine.h b/tools/perf/util/machine.h index fbc5133fb27c..245743d9ce63 100644 --- a/tools/perf/util/machine.h +++ b/tools/perf/util/machine.h @@ -170,6 +170,7 @@ static inline bool machine__is_host(struct machine *machine) } bool machine__is(struct machine *machine, const char *arch); +int machine__nr_cpus_avail(struct machine *machine); struct thread *__machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid); struct thread *machine__findnew_thread(struct machine *machine, pid_t pid, pid_t tid); -- 2.17.1
