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authorNamhyung Kim <namhyung@kernel.org>2021-06-25 00:18:24 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-07-01 15:00:33 -0300
commit21bcc7266129a68919438934a37c8793a528ff2b (patch)
tree2750846fc438dfc5115664cea295fc26a53800bf /tools
parent69e874db4dded0f2fe56ae623d7f54318395c87d (diff)
perf tools: Add cgroup_is_v2() helper
The cgroup_is_v2() is to check if the given subsystem is mounted on cgroup v2 or not. It'll be used by BPF cgroup code later. Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Ian Rogers <irogers@google.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Song Liu <songliubraving@fb.com> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20210625071826.608504-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/cgroup.c19
-rw-r--r--tools/perf/util/cgroup.h2
2 files changed, 21 insertions, 0 deletions
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
index ef18c988c681..e819a4f30fc2 100644
--- a/tools/perf/util/cgroup.c
+++ b/tools/perf/util/cgroup.c
@@ -9,6 +9,7 @@
#include <linux/zalloc.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <sys/statfs.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
@@ -70,6 +71,24 @@ int read_cgroup_id(struct cgroup *cgrp)
}
#endif /* HAVE_FILE_HANDLE */
+#ifndef CGROUP2_SUPER_MAGIC
+#define CGROUP2_SUPER_MAGIC 0x63677270
+#endif
+
+int cgroup_is_v2(const char *subsys)
+{
+ char mnt[PATH_MAX + 1];
+ struct statfs stbuf;
+
+ if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, subsys))
+ return -1;
+
+ if (statfs(mnt, &stbuf) < 0)
+ return -1;
+
+ return (stbuf.f_type == CGROUP2_SUPER_MAGIC);
+}
+
static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
{
struct evsel *counter;
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
index f3c978746999..de5b272560ab 100644
--- a/tools/perf/util/cgroup.h
+++ b/tools/perf/util/cgroup.h
@@ -48,4 +48,6 @@ static inline int read_cgroup_id(struct cgroup *cgrp __maybe_unused)
}
#endif /* HAVE_FILE_HANDLE */
+int cgroup_is_v2(const char *subsys);
+
#endif /* __CGROUP_H__ */