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perf machine: Add nr_cpus_avail()

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commit 9cecca325e upstream.

Add a function to return the number of the machine's available CPUs.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Adrian Hunter 2018-11-21 15:52:45 +02:00 committed by Greg Kroah-Hartman
parent 4edc059bac
commit 5d390059ea
4 changed files with 20 additions and 0 deletions
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13
tools/perf/util/env.c
View file

@ -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);

1
tools/perf/util/env.h
View file

@ -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 */

5
tools/perf/util/machine.c
View file

@ -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);

1
tools/perf/util/machine.h
View file

@ -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);