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perf env: Introduce read_cpu_topology_map() method

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Out of the code to write the cpu topology map in the perf.data file
header.

Now if one needs the CPU topology map for the running machine, one needs
to call perf_env__read_cpu_topology_map(perf_env) and the info will be
stored in perf_env.cpu.

For now we're using a global perf_env variable, that will have its
contents freed after we run a builtin.

v2: Check perf_env__read_cpu_topology_map() return in
    write_cpu_topology() (Kan Liang)

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/r/1441828225-667-5-git-send-email-acme@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2015-09-09 10:37:01 -03:00
commit aa36ddd7af
4 changed files with 44 additions and 16 deletions
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28
tools/perf/util/env.c
View file

@ -1,3 +1,4 @@
#include "cpumap.h"
#include "env.h"
#include "util.h"
@ -56,3 +57,30 @@ out_free:
out_enomem:
return -ENOMEM;
}
int perf_env__read_cpu_topology_map(struct perf_env *env)
{
int cpu, nr_cpus;
if (env->cpu != NULL)
return 0;
if (env->nr_cpus_avail == 0)
env->nr_cpus_avail = sysconf(_SC_NPROCESSORS_CONF);
nr_cpus = env->nr_cpus_avail;
if (nr_cpus == -1)
return -EINVAL;
env->cpu = calloc(nr_cpus, sizeof(env->cpu[0]));
if (env->cpu == NULL)
return -ENOMEM;
for (cpu = 0; cpu < nr_cpus; ++cpu) {
env->cpu[cpu].core_id = cpu_map__get_core_id(cpu);
env->cpu[cpu].socket_id = cpu_map__get_socket_id(cpu);
}
env->nr_cpus_avail = nr_cpus;
return 0;
}