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-rw-r--r--tools/perf/util/cgroup.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index f24ab4585553..ef18c988c681 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -45,6 +45,31 @@ static int open_cgroup(const char *name)
return fd;
}
+#ifdef HAVE_FILE_HANDLE
+int read_cgroup_id(struct cgroup *cgrp)
+{
+ char path[PATH_MAX + 1];
+ char mnt[PATH_MAX + 1];
+ struct {
+ struct file_handle fh;
+ uint64_t cgroup_id;
+ } handle;
+ int mount_id;
+
+ if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
+ return -1;
+
+ scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name);
+
+ handle.fh.handle_bytes = sizeof(handle.cgroup_id);
+ if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0)
+ return -1;
+
+ cgrp->id = handle.cgroup_id;
+ return 0;
+}
+#endif /* HAVE_FILE_HANDLE */
+
static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
{
struct evsel *counter;