[PATCH V3 5/5] perf tools: Apply new CPU topology sysfs attributes

kan.liang
2019-06-04T22:51:19Z

From: Kan Liang <kan.liang@linux.intel.com>

The existing "thread_siblings" and "thread_siblings_list" attribute will
be deprecated.
Use the new CPU topology sysfs attributes, "core_cpus" and
"core_cpus_list", which are synonymous with the deprecated attributes.

Check the new name first. If not available, use the deprecated name to
be compatible with old kernel.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
---

No changes since V2.

tools/perf/util/cputopo.c | 8 +++++++-
tools/perf/util/smt.c | 8 ++++++--
2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/cputopo.c b/tools/perf/util/cputopo.c
index 85fa87f..26e73a4b 100644
--- a/tools/perf/util/cputopo.c
+++ b/tools/perf/util/cputopo.c
@@ -15,6 +15,8 @@
"%s/devices/system/cpu/cpu%d/topology/die_cpus_list"
#define THRD_SIB_FMT \
"%s/devices/system/cpu/cpu%d/topology/thread_siblings_list"
+#define THRD_SIB_FMT_NEW \
+ "%s/devices/system/cpu/cpu%d/topology/core_cpus_list"
#define NODE_ONLINE_FMT \
"%s/devices/system/node/online"
#define NODE_MEMINFO_FMT \
@@ -91,8 +93,12 @@ static int build_cpu_topology(struct cpu_topology *tp, int cpu)
ret = 0;

try_threads:
- scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
+ scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT_NEW,
sysfs__mountpoint(), cpu);
+ if (access(filename, F_OK) == -1) {
+ scnprintf(filename, MAXPATHLEN, THRD_SIB_FMT,
+ sysfs__mountpoint(), cpu);
+ }
fp = fopen(filename, "r");
if (!fp)
goto done;
diff --git a/tools/perf/util/smt.c b/tools/perf/util/smt.c
index 453f6f6..3b791ef 100644
--- a/tools/perf/util/smt.c
+++ b/tools/perf/util/smt.c
@@ -23,8 +23,12 @@ int smt_on(void)
char fn[256];

snprintf(fn, sizeof fn,
- "devices/system/cpu/cpu%d/topology/thread_siblings",
- cpu);
+ "devices/system/cpu/cpu%d/topology/core_cpus", cpu);
+ if (access(fn, F_OK) == -1) {
+ 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 */
--
2.7.4