diff options
| author |   Namhyung Kim <namhyung@kernel.org> | 2021-06-25 00:18:24 -0700 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-07-01 15:00:33 -0300 |
| commit | 21bcc7266129a68919438934a37c8793a528ff2b (patch) | |
| tree | 2750846fc438dfc5115664cea295fc26a53800bf /tools/perf | |
| parent | perf tools: Add read_cgroup_id() function (diff) | |
| download | linux-dev-21bcc7266129a68919438934a37c8793a528ff2b.tar.xz linux-dev-21bcc7266129a68919438934a37c8793a528ff2b.zip | |
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/perf')
| -rw-r--r-- | tools/perf/util/cgroup.c | 19 | ||||
| -rw-r--r-- | tools/perf/util/cgroup.h | 2 |
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__ */ |