Commit | Line | Data |
---|---|---|
a696fa2a JA |
1 | /* |
2 | * Code related to setting up a blkio cgroup | |
3 | */ | |
4 | #include <stdio.h> | |
5 | #include <stdlib.h> | |
6 | #include "fio.h" | |
7 | #include "cgroup.h" | |
8 | ||
9 | static char *get_cgroup_root(struct thread_data *td) | |
10 | { | |
11 | char *str = malloc(64); | |
12 | ||
13 | if (td->o.cgroup) | |
14 | sprintf(str, "%s/%s", td->o.cgroup_root, td->o.cgroup); | |
15 | else | |
16 | sprintf(str, "%s/%s", td->o.cgroup_root, td->o.name); | |
17 | ||
18 | return str; | |
19 | } | |
20 | ||
21 | /* | |
22 | * Add pid to given class | |
23 | */ | |
24 | static int cgroup_add_pid(struct thread_data *td) | |
25 | { | |
26 | char *root, tmp[256]; | |
27 | FILE *f; | |
28 | ||
29 | root = get_cgroup_root(td); | |
30 | sprintf(tmp, "%s/tasks", root); | |
31 | ||
32 | f = fopen(tmp, "w"); | |
33 | if (!f) { | |
34 | td_verror(td, errno, "cgroup open tasks"); | |
35 | return 1; | |
36 | } | |
37 | ||
38 | fprintf(f, "%d", td->pid); | |
39 | fclose(f); | |
40 | free(root); | |
41 | return 0; | |
42 | } | |
43 | ||
44 | /* | |
45 | * Move pid to root class | |
46 | */ | |
47 | static int cgroup_del_pid(struct thread_data *td) | |
48 | { | |
49 | char tmp[256]; | |
50 | FILE *f; | |
51 | ||
52 | sprintf(tmp, "%s/tasks", td->o.cgroup_root); | |
53 | f = fopen(tmp, "w"); | |
54 | if (!f) { | |
55 | td_verror(td, errno, "cgroup open tasks"); | |
56 | return 1; | |
57 | } | |
58 | ||
59 | fprintf(f, "%d", td->pid); | |
60 | fclose(f); | |
61 | return 0; | |
62 | } | |
63 | ||
64 | ||
65 | int cgroup_setup(struct thread_data *td) | |
66 | { | |
67 | char *root, tmp[256]; | |
68 | FILE *f; | |
69 | ||
70 | /* | |
71 | * Create container, if it doesn't exist | |
72 | */ | |
73 | root = get_cgroup_root(td); | |
74 | if (mkdir(root, 0755) < 0) { | |
75 | int __e = errno; | |
76 | ||
77 | if (__e != EEXIST) { | |
78 | td_verror(td, __e, "cgroup mkdir"); | |
79 | return 1; | |
80 | } | |
81 | } else | |
82 | td->o.cgroup_was_created = 1; | |
83 | ||
84 | sprintf(tmp, "%s/blkio.weight", root); | |
85 | f = fopen(tmp, "w"); | |
86 | if (!f) { | |
87 | td_verror(td, errno, "cgroup open weight"); | |
88 | return 1; | |
89 | } | |
90 | ||
91 | fprintf(f, "%d", td->o.cgroup_weight); | |
92 | fclose(f); | |
93 | free(root); | |
94 | ||
95 | if (cgroup_add_pid(td)) | |
96 | return 1; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | void cgroup_shutdown(struct thread_data *td) | |
102 | { | |
103 | if (!td->o.cgroup_weight) | |
104 | return; | |
105 | ||
106 | cgroup_del_pid(td); | |
107 | ||
108 | if (td->o.cgroup_was_created) { | |
109 | char *root; | |
110 | ||
111 | root = get_cgroup_root(td); | |
112 | rmdir(root); | |
113 | free(root); | |
114 | } | |
115 | } |