diff options
author | Andi Kleen <ak@linux.intel.com> | 2017-08-12 02:26:22 +0300 |
---|---|---|
committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2017-08-22 18:09:04 +0300 |
commit | de5077c4e38f2a51f50d28bdd5e4a0f14b3d16ff (patch) | |
tree | 95de3aa45603112fa658a9b12f9e2e591bec57e9 /tools/perf | |
parent | 77d0871c76bad1093a3d86870fe76dd1ad0ca397 (diff) | |
download | linux-de5077c4e38f2a51f50d28bdd5e4a0f14b3d16ff.tar.xz |
perf tools: Add utility function to detect SMT status
Add an smt_on() function to return if SMT is enabled or disabled. Used
in the next patch.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20170811232634.30465-7-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
-rw-r--r-- | tools/perf/util/Build | 1 | ||||
-rw-r--r-- | tools/perf/util/smt.c | 44 | ||||
-rw-r--r-- | tools/perf/util/smt.h | 6 |
3 files changed, 51 insertions, 0 deletions
diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 8d49a989f193..94518c1bf8b6 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -22,6 +22,7 @@ libperf-y += rbtree.o libperf-y += libstring.o libperf-y += bitmap.o libperf-y += hweight.o +libperf-y += smt.o libperf-y += quote.o libperf-y += strbuf.o libperf-y += string.o diff --git a/tools/perf/util/smt.c b/tools/perf/util/smt.c new file mode 100644 index 000000000000..453f6f6f29f3 --- /dev/null +++ b/tools/perf/util/smt.c @@ -0,0 +1,44 @@ +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <linux/bitops.h> +#include "api/fs/fs.h" +#include "smt.h" + +int smt_on(void) +{ + static bool cached; + static int cached_result; + int cpu; + int ncpu; + + if (cached) + return cached_result; + + ncpu = sysconf(_SC_NPROCESSORS_CONF); + for (cpu = 0; cpu < ncpu; cpu++) { + unsigned long long siblings; + char *str; + size_t strlen; + char fn[256]; + + snprintf(fn, sizeof fn, + "devices/system/cpu/cpu%d/topology/thread_siblings", + cpu); + if (sysfs__read_str(fn, &str, &strlen) < 0) + continue; + /* Entry is hex, but does not have 0x, so need custom parser */ + siblings = strtoull(str, NULL, 16); + free(str); + if (hweight64(siblings) > 1) { + cached_result = 1; + cached = true; + break; + } + } + if (!cached) { + cached_result = 0; + cached = true; + } + return cached_result; +} diff --git a/tools/perf/util/smt.h b/tools/perf/util/smt.h new file mode 100644 index 000000000000..b8414b7bcbc8 --- /dev/null +++ b/tools/perf/util/smt.h @@ -0,0 +1,6 @@ +#ifndef SMT_H +#define SMT_H 1 + +int smt_on(void); + +#endif |