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perf env: Add routine to read the env->cpuid from the running machine 

In 'perf top' we use that cpuid when initializing the per arch
annotation init routines (e.g. x86__annotate_init()) and in that case
(live mode, 'perf top') we need to obtain it from the running machine,
not from a perf.data file header.

Provide a means to do that. Will be used by 'perf top' in a followup
patch.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-h2wb3sx7u7znx6lqfezrh7ca@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-09-30 11:50:15 -03:00
parent f733c6b508
commit f1cedfb828
2 changed files with 17 additions and 0 deletions
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16
tools/perf/util/env.c
View File

@ -2,6 +2,7 @@
#include "cpumap.h"
#include "debug.h"
#include "env.h"
#include "util/header.h"
#include <linux/ctype.h>
#include <linux/zalloc.h>
#include "bpf-event.h"
@ -256,6 +257,21 @@ int perf_env__read_cpu_topology_map(struct perf_env *env)
return 0;
}
int perf_env__read_cpuid(struct perf_env *env)
{
char cpuid[128];
int err = get_cpuid(cpuid, sizeof(cpuid));
if (err)
return err;
free(env->cpuid);
env->cpuid = strdup(cpuid);
if (env->cpuid == NULL)
return ENOMEM;
return 0;
}
static int perf_env__read_arch(struct perf_env *env)
{
struct utsname uts;

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

@ -104,6 +104,7 @@ void perf_env__exit(struct perf_env *env);
int perf_env__set_cmdline(struct perf_env *env, int argc, const char *argv[]);
int perf_env__read_cpuid(struct perf_env *env);
int perf_env__read_cpu_topology_map(struct perf_env *env);
void cpu_cache_level__free(struct cpu_cache_level *cache);