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perf tools: Add cgroup_is_v2() helper

Browse source 
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>
This commit is contained in:
Namhyung Kim 2021-06-25 00:18:24 -07:00 committed by Arnaldo Carvalho de Melo
parent 69e874db4d
commit 21bcc72661
2 changed files with 21 additions and 0 deletions
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19
tools/perf/util/cgroup.c
View file

@ -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;

2
tools/perf/util/cgroup.h
View file

@ -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__ */