Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Code related to setting up a blkio cgroup |
| 3 | */ |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 6 | #include <mntent.h> |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 7 | #include "fio.h" |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 8 | #include "flist.h" |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 9 | #include "cgroup.h" |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 10 | #include "smalloc.h" |
| 11 | |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 12 | static struct fio_mutex *lock; |
| 13 | |
| 14 | struct cgroup_member { |
| 15 | struct flist_head list; |
| 16 | char *root; |
| 17 | }; |
| 18 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 19 | static char *find_cgroup_mnt(struct thread_data *td) |
| 20 | { |
| 21 | char *mntpoint = NULL; |
| 22 | struct mntent *mnt; |
| 23 | FILE *f; |
| 24 | |
| 25 | f = setmntent("/proc/mounts", "r"); |
| 26 | if (!f) { |
| 27 | td_verror(td, errno, "setmntent /proc/mounts"); |
| 28 | return NULL; |
| 29 | } |
| 30 | |
| 31 | while ((mnt = getmntent(f)) != NULL) { |
| 32 | if (!strcmp(mnt->mnt_type, "cgroup") && |
| 33 | strstr(mnt->mnt_opts, "blkio")) |
| 34 | break; |
| 35 | } |
| 36 | |
| 37 | if (mnt) |
| 38 | mntpoint = smalloc_strdup(mnt->mnt_dir); |
| 39 | else |
| 40 | log_err("fio: cgroup blkio does not appear to be mounted\n"); |
| 41 | |
| 42 | endmntent(f); |
| 43 | return mntpoint; |
| 44 | } |
| 45 | |
Jens Axboe | dae5341 | 2009-12-04 19:54:18 +0100 | [diff] [blame] | 46 | static void add_cgroup(const char *name, struct flist_head *clist) |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 47 | { |
| 48 | struct cgroup_member *cm; |
| 49 | |
| 50 | cm = smalloc(sizeof(*cm)); |
| 51 | INIT_FLIST_HEAD(&cm->list); |
| 52 | cm->root = smalloc_strdup(name); |
| 53 | |
| 54 | fio_mutex_down(lock); |
Jens Axboe | dae5341 | 2009-12-04 19:54:18 +0100 | [diff] [blame] | 55 | flist_add_tail(&cm->list, clist); |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 56 | fio_mutex_up(lock); |
| 57 | } |
| 58 | |
Jens Axboe | dae5341 | 2009-12-04 19:54:18 +0100 | [diff] [blame] | 59 | void cgroup_kill(struct flist_head *clist) |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 60 | { |
| 61 | struct flist_head *n, *tmp; |
| 62 | struct cgroup_member *cm; |
| 63 | |
| 64 | fio_mutex_down(lock); |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 65 | |
Jens Axboe | dae5341 | 2009-12-04 19:54:18 +0100 | [diff] [blame] | 66 | flist_for_each_safe(n, tmp, clist) { |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 67 | cm = flist_entry(n, struct cgroup_member, list); |
| 68 | rmdir(cm->root); |
| 69 | flist_del(&cm->list); |
| 70 | sfree(cm->root); |
| 71 | sfree(cm); |
| 72 | } |
| 73 | |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 74 | fio_mutex_up(lock); |
| 75 | } |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 76 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 77 | static char *get_cgroup_root(struct thread_data *td, char *mnt) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 78 | { |
| 79 | char *str = malloc(64); |
| 80 | |
| 81 | if (td->o.cgroup) |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 82 | sprintf(str, "%s/%s", mnt, td->o.cgroup); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 83 | else |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 84 | sprintf(str, "%s/%s", mnt, td->o.name); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 85 | |
| 86 | return str; |
| 87 | } |
| 88 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 89 | static int write_int_to_file(struct thread_data *td, const char *path, |
| 90 | const char *filename, unsigned int val, |
| 91 | const char *onerr) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 92 | { |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 93 | char tmp[256]; |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 94 | FILE *f; |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 95 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 96 | sprintf(tmp, "%s/%s", path, filename); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 97 | f = fopen(tmp, "w"); |
| 98 | if (!f) { |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 99 | td_verror(td, errno, onerr); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 100 | return 1; |
| 101 | } |
| 102 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 103 | fprintf(f, "%u", val); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 104 | fclose(f); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 105 | return 0; |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 106 | |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 107 | } |
| 108 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 109 | static int cgroup_write_pid(struct thread_data *td, const char *root) |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 110 | { |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 111 | unsigned int val = td->pid; |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 112 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 113 | return write_int_to_file(td, root, "tasks", val, "cgroup write pid"); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | /* |
| 117 | * Move pid to root class |
| 118 | */ |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 119 | static int cgroup_del_pid(struct thread_data *td, char *mnt) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 120 | { |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 121 | return cgroup_write_pid(td, mnt); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 122 | } |
| 123 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 124 | int cgroup_setup(struct thread_data *td, struct flist_head *clist, char **mnt) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 125 | { |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 126 | char *root; |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 127 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 128 | if (!*mnt) { |
| 129 | *mnt = find_cgroup_mnt(td); |
| 130 | if (!*mnt) |
| 131 | return 1; |
Jens Axboe | ddf16fe | 2009-12-04 10:54:45 +0100 | [diff] [blame] | 132 | } |
| 133 | |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 134 | /* |
| 135 | * Create container, if it doesn't exist |
| 136 | */ |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 137 | root = get_cgroup_root(td, *mnt); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 138 | if (mkdir(root, 0755) < 0) { |
| 139 | int __e = errno; |
| 140 | |
| 141 | if (__e != EEXIST) { |
| 142 | td_verror(td, __e, "cgroup mkdir"); |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 143 | log_err("fio: path %s\n", root); |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 144 | goto err; |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 145 | } |
| 146 | } else |
Jens Axboe | dae5341 | 2009-12-04 19:54:18 +0100 | [diff] [blame] | 147 | add_cgroup(root, clist); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 148 | |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 149 | if (td->o.cgroup_weight) { |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 150 | if (write_int_to_file(td, root, "blkio.weight", |
| 151 | td->o.cgroup_weight, |
| 152 | "cgroup open weight")) |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 153 | goto err; |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 154 | } |
| 155 | |
Jens Axboe | 8a4d0ff | 2009-12-04 22:13:43 +0100 | [diff] [blame] | 156 | if (!cgroup_write_pid(td, root)) { |
| 157 | free(root); |
| 158 | return 0; |
| 159 | } |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 160 | |
Jens Axboe | 3858bf9 | 2009-12-04 19:26:22 +0100 | [diff] [blame] | 161 | err: |
| 162 | free(root); |
| 163 | return 1; |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 164 | } |
| 165 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 166 | void cgroup_shutdown(struct thread_data *td, char **mnt) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 167 | { |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 168 | if (*mnt == NULL) |
Jens Axboe | ddf16fe | 2009-12-04 10:54:45 +0100 | [diff] [blame] | 169 | return; |
Jens Axboe | ed81ee1 | 2009-12-05 22:30:04 +0100 | [diff] [blame] | 170 | if (!td->o.cgroup_weight && !td->o.cgroup) |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 171 | return; |
| 172 | |
Jens Axboe | 6adb38a | 2009-12-07 08:01:26 +0100 | [diff] [blame] | 173 | cgroup_del_pid(td, *mnt); |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 174 | } |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 175 | |
Jens Axboe | 39f2202 | 2009-12-04 11:29:12 +0100 | [diff] [blame] | 176 | static void fio_init cgroup_init(void) |
| 177 | { |
| 178 | lock = fio_mutex_init(1); |
| 179 | } |
| 180 | |
| 181 | static void fio_exit cgroup_exit(void) |
| 182 | { |
| 183 | fio_mutex_remove(lock); |
Jens Axboe | a696fa2 | 2009-12-04 10:05:02 +0100 | [diff] [blame] | 184 | } |