[PATCH V2 5/5] perf tools: Apply new CPU topology sysfs attributes

[kan . liang]

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

New for 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