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author | 2020-01-27 19:00:31 +0900 | |
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committer | 2020-03-04 10:34:09 -0300 | |
commit | 7982a898515064ba180d958bfc89ed22d13905ee (patch) | |
tree | 6bdc83844fbf9854fc97c1f155f370636917afb0 /tools/perf/util/cgroup.c | |
parent | Merge remote-tracking branch 'acme/perf/urgent' into perf/core (diff) | |
download | linux-7982a898515064ba180d958bfc89ed22d13905ee.tar.gz linux-7982a898515064ba180d958bfc89ed22d13905ee.tar.bz2 linux-7982a898515064ba180d958bfc89ed22d13905ee.zip |
tools lib api fs: Move cgroupsfs_find_mountpoint()
Move it from tools/perf/util/cgroup.c as it can be used by other places.
Note that cgroup filesystem is different from others since it's usually
mounted separately (in v1) for each subsystem.
I just copied the code with a little modification to pass a name of
subsystem.
Suggested-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200127100031.1368732-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/cgroup.c')
-rw-r--r-- | tools/perf/util/cgroup.c | 63 |
1 files changed, 2 insertions, 61 deletions
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c index 4881d4af3381..5bc9d3b01bd9 100644 --- a/tools/perf/util/cgroup.c +++ b/tools/perf/util/cgroup.c @@ -3,75 +3,16 @@ #include "evsel.h" #include "cgroup.h" #include "evlist.h" -#include <linux/stringify.h> #include <linux/zalloc.h> #include <sys/types.h> #include <sys/stat.h> #include <fcntl.h> #include <stdlib.h> #include <string.h> +#include <api/fs/fs.h> int nr_cgroups; -static int -cgroupfs_find_mountpoint(char *buf, size_t maxlen) -{ - FILE *fp; - char mountpoint[PATH_MAX + 1], tokens[PATH_MAX + 1], type[PATH_MAX + 1]; - char path_v1[PATH_MAX + 1], path_v2[PATH_MAX + 2], *path; - char *token, *saved_ptr = NULL; - - fp = fopen("/proc/mounts", "r"); - if (!fp) - return -1; - - /* - * in order to handle split hierarchy, we need to scan /proc/mounts - * and inspect every cgroupfs mount point to find one that has - * perf_event subsystem - */ - path_v1[0] = '\0'; - path_v2[0] = '\0'; - - while (fscanf(fp, "%*s %"__stringify(PATH_MAX)"s %"__stringify(PATH_MAX)"s %" - __stringify(PATH_MAX)"s %*d %*d\n", - mountpoint, type, tokens) == 3) { - - if (!path_v1[0] && !strcmp(type, "cgroup")) { - - token = strtok_r(tokens, ",", &saved_ptr); - - while (token != NULL) { - if (!strcmp(token, "perf_event")) { - strcpy(path_v1, mountpoint); - break; - } - token = strtok_r(NULL, ",", &saved_ptr); - } - } - - if (!path_v2[0] && !strcmp(type, "cgroup2")) - strcpy(path_v2, mountpoint); - - if (path_v1[0] && path_v2[0]) - break; - } - fclose(fp); - - if (path_v1[0]) - path = path_v1; - else if (path_v2[0]) - path = path_v2; - else - return -1; - - if (strlen(path) < maxlen) { - strcpy(buf, path); - return 0; - } - return -1; -} - static int open_cgroup(const char *name) { char path[PATH_MAX + 1]; @@ -79,7 +20,7 @@ static int open_cgroup(const char *name) int fd; - if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1)) + if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event")) return -1; scnprintf(path, PATH_MAX, "%s/%s", mnt, name); |