Commit | Line | Data |
---|---|---|
a696fa2a JA |
1 | /* |
2 | * Code related to setting up a blkio cgroup | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
6adb38a1 | 6 | #include <mntent.h> |
4f49b8a7 JA |
7 | #include <sys/stat.h> |
8 | #include <sys/types.h> | |
a696fa2a | 9 | #include "fio.h" |
39f22027 | 10 | #include "flist.h" |
a696fa2a | 11 | #include "cgroup.h" |
39f22027 JA |
12 | #include "smalloc.h" |
13 | ||
39f22027 JA |
14 | static struct fio_mutex *lock; |
15 | ||
16 | struct cgroup_member { | |
17 | struct flist_head list; | |
18 | char *root; | |
7de87099 | 19 | unsigned int cgroup_nodelete; |
39f22027 JA |
20 | }; |
21 | ||
6adb38a1 JA |
22 | static char *find_cgroup_mnt(struct thread_data *td) |
23 | { | |
24 | char *mntpoint = NULL; | |
25 | struct mntent *mnt; | |
26 | FILE *f; | |
27 | ||
28 | f = setmntent("/proc/mounts", "r"); | |
29 | if (!f) { | |
30 | td_verror(td, errno, "setmntent /proc/mounts"); | |
31 | return NULL; | |
32 | } | |
33 | ||
34 | while ((mnt = getmntent(f)) != NULL) { | |
35 | if (!strcmp(mnt->mnt_type, "cgroup") && | |
36 | strstr(mnt->mnt_opts, "blkio")) | |
37 | break; | |
38 | } | |
39 | ||
40 | if (mnt) | |
41 | mntpoint = smalloc_strdup(mnt->mnt_dir); | |
42 | else | |
43 | log_err("fio: cgroup blkio does not appear to be mounted\n"); | |
44 | ||
45 | endmntent(f); | |
46 | return mntpoint; | |
47 | } | |
48 | ||
7de87099 VG |
49 | static void add_cgroup(struct thread_data *td, const char *name, |
50 | struct flist_head *clist) | |
39f22027 JA |
51 | { |
52 | struct cgroup_member *cm; | |
53 | ||
54 | cm = smalloc(sizeof(*cm)); | |
55 | INIT_FLIST_HEAD(&cm->list); | |
56 | cm->root = smalloc_strdup(name); | |
7de87099 VG |
57 | if (td->o.cgroup_nodelete) |
58 | cm->cgroup_nodelete = 1; | |
39f22027 | 59 | fio_mutex_down(lock); |
dae5341c | 60 | flist_add_tail(&cm->list, clist); |
39f22027 JA |
61 | fio_mutex_up(lock); |
62 | } | |
63 | ||
dae5341c | 64 | void cgroup_kill(struct flist_head *clist) |
39f22027 JA |
65 | { |
66 | struct flist_head *n, *tmp; | |
67 | struct cgroup_member *cm; | |
68 | ||
69 | fio_mutex_down(lock); | |
39f22027 | 70 | |
dae5341c | 71 | flist_for_each_safe(n, tmp, clist) { |
39f22027 | 72 | cm = flist_entry(n, struct cgroup_member, list); |
7de87099 VG |
73 | if (!cm->cgroup_nodelete) |
74 | rmdir(cm->root); | |
39f22027 JA |
75 | flist_del(&cm->list); |
76 | sfree(cm->root); | |
77 | sfree(cm); | |
78 | } | |
79 | ||
39f22027 JA |
80 | fio_mutex_up(lock); |
81 | } | |
a696fa2a | 82 | |
6adb38a1 | 83 | static char *get_cgroup_root(struct thread_data *td, char *mnt) |
a696fa2a JA |
84 | { |
85 | char *str = malloc(64); | |
86 | ||
87 | if (td->o.cgroup) | |
6adb38a1 | 88 | sprintf(str, "%s/%s", mnt, td->o.cgroup); |
a696fa2a | 89 | else |
6adb38a1 | 90 | sprintf(str, "%s/%s", mnt, td->o.name); |
a696fa2a JA |
91 | |
92 | return str; | |
93 | } | |
94 | ||
8a4d0ff0 JA |
95 | static int write_int_to_file(struct thread_data *td, const char *path, |
96 | const char *filename, unsigned int val, | |
97 | const char *onerr) | |
a696fa2a | 98 | { |
3858bf9e | 99 | char tmp[256]; |
a696fa2a | 100 | FILE *f; |
3858bf9e | 101 | |
8a4d0ff0 | 102 | sprintf(tmp, "%s/%s", path, filename); |
a696fa2a JA |
103 | f = fopen(tmp, "w"); |
104 | if (!f) { | |
8a4d0ff0 | 105 | td_verror(td, errno, onerr); |
a696fa2a JA |
106 | return 1; |
107 | } | |
108 | ||
8a4d0ff0 | 109 | fprintf(f, "%u", val); |
a696fa2a | 110 | fclose(f); |
a696fa2a | 111 | return 0; |
8a4d0ff0 | 112 | |
a696fa2a JA |
113 | } |
114 | ||
8a4d0ff0 | 115 | static int cgroup_write_pid(struct thread_data *td, const char *root) |
a696fa2a | 116 | { |
8a4d0ff0 | 117 | unsigned int val = td->pid; |
a696fa2a | 118 | |
8a4d0ff0 | 119 | return write_int_to_file(td, root, "tasks", val, "cgroup write pid"); |
a696fa2a JA |
120 | } |
121 | ||
3858bf9e JA |
122 | /* |
123 | * Move pid to root class | |
124 | */ | |
6adb38a1 | 125 | static int cgroup_del_pid(struct thread_data *td, char *mnt) |
3858bf9e | 126 | { |
6adb38a1 | 127 | return cgroup_write_pid(td, mnt); |
3858bf9e | 128 | } |
a696fa2a | 129 | |
6adb38a1 | 130 | int cgroup_setup(struct thread_data *td, struct flist_head *clist, char **mnt) |
a696fa2a | 131 | { |
8a4d0ff0 | 132 | char *root; |
a696fa2a | 133 | |
6adb38a1 JA |
134 | if (!*mnt) { |
135 | *mnt = find_cgroup_mnt(td); | |
136 | if (!*mnt) | |
137 | return 1; | |
ddf16fe4 JA |
138 | } |
139 | ||
a696fa2a JA |
140 | /* |
141 | * Create container, if it doesn't exist | |
142 | */ | |
6adb38a1 | 143 | root = get_cgroup_root(td, *mnt); |
a696fa2a JA |
144 | if (mkdir(root, 0755) < 0) { |
145 | int __e = errno; | |
146 | ||
147 | if (__e != EEXIST) { | |
148 | td_verror(td, __e, "cgroup mkdir"); | |
6adb38a1 | 149 | log_err("fio: path %s\n", root); |
3858bf9e | 150 | goto err; |
a696fa2a JA |
151 | } |
152 | } else | |
7de87099 | 153 | add_cgroup(td, root, clist); |
a696fa2a | 154 | |
39f22027 | 155 | if (td->o.cgroup_weight) { |
8a4d0ff0 JA |
156 | if (write_int_to_file(td, root, "blkio.weight", |
157 | td->o.cgroup_weight, | |
158 | "cgroup open weight")) | |
3858bf9e | 159 | goto err; |
a696fa2a JA |
160 | } |
161 | ||
8a4d0ff0 JA |
162 | if (!cgroup_write_pid(td, root)) { |
163 | free(root); | |
164 | return 0; | |
165 | } | |
a696fa2a | 166 | |
3858bf9e JA |
167 | err: |
168 | free(root); | |
169 | return 1; | |
a696fa2a JA |
170 | } |
171 | ||
6adb38a1 | 172 | void cgroup_shutdown(struct thread_data *td, char **mnt) |
a696fa2a | 173 | { |
6adb38a1 | 174 | if (*mnt == NULL) |
ddf16fe4 | 175 | return; |
ed81ee19 | 176 | if (!td->o.cgroup_weight && !td->o.cgroup) |
a696fa2a JA |
177 | return; |
178 | ||
6adb38a1 | 179 | cgroup_del_pid(td, *mnt); |
39f22027 | 180 | } |
a696fa2a | 181 | |
39f22027 JA |
182 | static void fio_init cgroup_init(void) |
183 | { | |
184 | lock = fio_mutex_init(1); | |
185 | } | |
186 | ||
187 | static void fio_exit cgroup_exit(void) | |
188 | { | |
189 | fio_mutex_remove(lock); | |
a696fa2a | 190 | } |