diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-09-30 11:50:15 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-10-07 12:22:17 -0300 |
| commit | f1cedfb82858c8a7ec21e45d0ce7b6e2ce9edea0 (patch) | |
| tree | 4755fd25c223485e743ee9d4150522616348f282 | |
| parent | f733c6b508bcaa3441ba1eacf16efb9abd47489f (diff) | |
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>
| -rw-r--r-- | tools/perf/util/env.c | 16 | ||||
| -rw-r--r-- | tools/perf/util/env.h | 1 |
2 files changed, 17 insertions, 0 deletions
diff --git a/tools/perf/util/env.c b/tools/perf/util/env.c index 3baca06786fb..2a91a10ccfcc 100644 --- a/tools/perf/util/env.c +++ b/tools/perf/util/env.c @@ -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; diff --git a/tools/perf/util/env.h b/tools/perf/util/env.h index db40906e2937..a3059dc1abe5 100644 --- a/tools/perf/util/env.h +++ b/tools/perf/util/env.h @@ -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); |