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31e4c28d VG |
1 | #ifndef _BLK_CGROUP_H |
2 | #define _BLK_CGROUP_H | |
3 | /* | |
4 | * Common Block IO controller cgroup interface | |
5 | * | |
6 | * Based on ideas and code from CFQ, CFS and BFQ: | |
7 | * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> | |
8 | * | |
9 | * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> | |
10 | * Paolo Valente <paolo.valente@unimore.it> | |
11 | * | |
12 | * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> | |
13 | * Nauman Rafique <nauman@google.com> | |
14 | */ | |
15 | ||
16 | #include <linux/cgroup.h> | |
17 | ||
67523c48 BB |
18 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
19 | ||
20 | #ifndef CONFIG_BLK_CGROUP | |
21 | /* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */ | |
22 | extern struct cgroup_subsys blkio_subsys; | |
23 | #define blkio_subsys_id blkio_subsys.subsys_id | |
24 | #endif | |
2f5ea477 | 25 | |
84c124da DS |
26 | enum stat_type { |
27 | /* Total time spent (in ns) between request dispatch to the driver and | |
28 | * request completion for IOs doen by this cgroup. This may not be | |
29 | * accurate when NCQ is turned on. */ | |
30 | BLKIO_STAT_SERVICE_TIME = 0, | |
31 | /* Total bytes transferred */ | |
32 | BLKIO_STAT_SERVICE_BYTES, | |
33 | /* Total IOs serviced, post merge */ | |
34 | BLKIO_STAT_SERVICED, | |
35 | /* Total time spent waiting in scheduler queue in ns */ | |
36 | BLKIO_STAT_WAIT_TIME, | |
812d4026 DS |
37 | /* Number of IOs merged */ |
38 | BLKIO_STAT_MERGED, | |
cdc1184c DS |
39 | /* Number of IOs queued up */ |
40 | BLKIO_STAT_QUEUED, | |
84c124da DS |
41 | /* All the single valued stats go below this */ |
42 | BLKIO_STAT_TIME, | |
43 | BLKIO_STAT_SECTORS, | |
44 | #ifdef CONFIG_DEBUG_BLK_CGROUP | |
cdc1184c | 45 | BLKIO_STAT_AVG_QUEUE_SIZE, |
812df48d DS |
46 | BLKIO_STAT_IDLE_TIME, |
47 | BLKIO_STAT_EMPTY_TIME, | |
48 | BLKIO_STAT_GROUP_WAIT_TIME, | |
84c124da DS |
49 | BLKIO_STAT_DEQUEUE |
50 | #endif | |
51 | }; | |
52 | ||
53 | enum stat_sub_type { | |
54 | BLKIO_STAT_READ = 0, | |
55 | BLKIO_STAT_WRITE, | |
56 | BLKIO_STAT_SYNC, | |
57 | BLKIO_STAT_ASYNC, | |
58 | BLKIO_STAT_TOTAL | |
303a3acb DS |
59 | }; |
60 | ||
812df48d DS |
61 | /* blkg state flags */ |
62 | enum blkg_state_flags { | |
63 | BLKG_waiting = 0, | |
64 | BLKG_idling, | |
65 | BLKG_empty, | |
66 | }; | |
67 | ||
31e4c28d VG |
68 | struct blkio_cgroup { |
69 | struct cgroup_subsys_state css; | |
70 | unsigned int weight; | |
71 | spinlock_t lock; | |
72 | struct hlist_head blkg_list; | |
34d0f179 | 73 | struct list_head policy_list; /* list of blkio_policy_node */ |
31e4c28d VG |
74 | }; |
75 | ||
303a3acb DS |
76 | struct blkio_group_stats { |
77 | /* total disk time and nr sectors dispatched by this group */ | |
78 | uint64_t time; | |
79 | uint64_t sectors; | |
cdc1184c | 80 | uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL]; |
303a3acb | 81 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
cdc1184c DS |
82 | /* Sum of number of IOs queued across all samples */ |
83 | uint64_t avg_queue_size_sum; | |
84 | /* Count of samples taken for average */ | |
85 | uint64_t avg_queue_size_samples; | |
303a3acb DS |
86 | /* How many times this group has been removed from service tree */ |
87 | unsigned long dequeue; | |
812df48d DS |
88 | |
89 | /* Total time spent waiting for it to be assigned a timeslice. */ | |
90 | uint64_t group_wait_time; | |
91 | uint64_t start_group_wait_time; | |
92 | ||
93 | /* Time spent idling for this blkio_group */ | |
94 | uint64_t idle_time; | |
95 | uint64_t start_idle_time; | |
96 | /* | |
97 | * Total time when we have requests queued and do not contain the | |
98 | * current active queue. | |
99 | */ | |
100 | uint64_t empty_time; | |
101 | uint64_t start_empty_time; | |
102 | uint16_t flags; | |
303a3acb DS |
103 | #endif |
104 | }; | |
105 | ||
31e4c28d VG |
106 | struct blkio_group { |
107 | /* An rcu protected unique identifier for the group */ | |
108 | void *key; | |
109 | struct hlist_node blkcg_node; | |
b1c35769 | 110 | unsigned short blkcg_id; |
2868ef7b VG |
111 | /* Store cgroup path */ |
112 | char path[128]; | |
22084190 | 113 | /* The device MKDEV(major, minor), this group has been created for */ |
84c124da | 114 | dev_t dev; |
22084190 | 115 | |
303a3acb DS |
116 | /* Need to serialize the stats in the case of reset/update */ |
117 | spinlock_t stats_lock; | |
118 | struct blkio_group_stats stats; | |
31e4c28d VG |
119 | }; |
120 | ||
34d0f179 GJ |
121 | struct blkio_policy_node { |
122 | struct list_head node; | |
123 | dev_t dev; | |
124 | unsigned int weight; | |
125 | }; | |
126 | ||
127 | extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, | |
128 | dev_t dev); | |
129 | ||
3e252066 VG |
130 | typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); |
131 | typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, | |
132 | unsigned int weight); | |
133 | ||
134 | struct blkio_policy_ops { | |
135 | blkio_unlink_group_fn *blkio_unlink_group_fn; | |
136 | blkio_update_group_weight_fn *blkio_update_group_weight_fn; | |
137 | }; | |
138 | ||
139 | struct blkio_policy_type { | |
140 | struct list_head list; | |
141 | struct blkio_policy_ops ops; | |
142 | }; | |
143 | ||
144 | /* Blkio controller policy registration */ | |
145 | extern void blkio_policy_register(struct blkio_policy_type *); | |
146 | extern void blkio_policy_unregister(struct blkio_policy_type *); | |
147 | ||
afc24d49 VG |
148 | static inline char *blkg_path(struct blkio_group *blkg) |
149 | { | |
150 | return blkg->path; | |
151 | } | |
152 | ||
2f5ea477 JA |
153 | #else |
154 | ||
155 | struct blkio_group { | |
156 | }; | |
157 | ||
3e252066 VG |
158 | struct blkio_policy_type { |
159 | }; | |
160 | ||
161 | static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } | |
162 | static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } | |
163 | ||
afc24d49 VG |
164 | static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } |
165 | ||
2f5ea477 JA |
166 | #endif |
167 | ||
31e4c28d VG |
168 | #define BLKIO_WEIGHT_MIN 100 |
169 | #define BLKIO_WEIGHT_MAX 1000 | |
170 | #define BLKIO_WEIGHT_DEFAULT 500 | |
171 | ||
2868ef7b | 172 | #ifdef CONFIG_DEBUG_BLK_CGROUP |
a11cdaa7 | 173 | void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg); |
9195291e | 174 | void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
22084190 | 175 | unsigned long dequeue); |
812df48d DS |
176 | void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg); |
177 | void blkiocg_update_idle_time_stats(struct blkio_group *blkg); | |
e5ff082e | 178 | void blkiocg_set_start_empty_time(struct blkio_group *blkg); |
812df48d DS |
179 | |
180 | #define BLKG_FLAG_FNS(name) \ | |
181 | static inline void blkio_mark_blkg_##name( \ | |
182 | struct blkio_group_stats *stats) \ | |
183 | { \ | |
184 | stats->flags |= (1 << BLKG_##name); \ | |
185 | } \ | |
186 | static inline void blkio_clear_blkg_##name( \ | |
187 | struct blkio_group_stats *stats) \ | |
188 | { \ | |
189 | stats->flags &= ~(1 << BLKG_##name); \ | |
190 | } \ | |
191 | static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \ | |
192 | { \ | |
193 | return (stats->flags & (1 << BLKG_##name)) != 0; \ | |
194 | } \ | |
195 | ||
196 | BLKG_FLAG_FNS(waiting) | |
197 | BLKG_FLAG_FNS(idling) | |
198 | BLKG_FLAG_FNS(empty) | |
199 | #undef BLKG_FLAG_FNS | |
2868ef7b | 200 | #else |
a11cdaa7 | 201 | static inline void blkiocg_update_avg_queue_size_stats( |
cdc1184c | 202 | struct blkio_group *blkg) {} |
9195291e DS |
203 | static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
204 | unsigned long dequeue) {} | |
812df48d DS |
205 | static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
206 | {} | |
207 | static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {} | |
e5ff082e | 208 | static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {} |
2868ef7b VG |
209 | #endif |
210 | ||
67523c48 | 211 | #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
31e4c28d VG |
212 | extern struct blkio_cgroup blkio_root_cgroup; |
213 | extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); | |
214 | extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
22084190 | 215 | struct blkio_group *blkg, void *key, dev_t dev); |
31e4c28d VG |
216 | extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
217 | extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, | |
218 | void *key); | |
303a3acb DS |
219 | void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
220 | unsigned long time); | |
84c124da DS |
221 | void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes, |
222 | bool direction, bool sync); | |
223 | void blkiocg_update_completion_stats(struct blkio_group *blkg, | |
224 | uint64_t start_time, uint64_t io_start_time, bool direction, bool sync); | |
812d4026 DS |
225 | void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
226 | bool sync); | |
a11cdaa7 | 227 | void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
cdc1184c | 228 | struct blkio_group *curr_blkg, bool direction, bool sync); |
a11cdaa7 | 229 | void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
cdc1184c | 230 | bool direction, bool sync); |
31e4c28d | 231 | #else |
2f5ea477 | 232 | struct cgroup; |
31e4c28d VG |
233 | static inline struct blkio_cgroup * |
234 | cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } | |
235 | ||
236 | static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, | |
84c124da | 237 | struct blkio_group *blkg, void *key, dev_t dev) {} |
31e4c28d VG |
238 | |
239 | static inline int | |
240 | blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } | |
241 | ||
242 | static inline struct blkio_group * | |
243 | blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } | |
303a3acb | 244 | static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
9a0785b0 | 245 | unsigned long time) {} |
84c124da DS |
246 | static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
247 | uint64_t bytes, bool direction, bool sync) {} | |
248 | static inline void blkiocg_update_completion_stats(struct blkio_group *blkg, | |
249 | uint64_t start_time, uint64_t io_start_time, bool direction, | |
250 | bool sync) {} | |
812d4026 DS |
251 | static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg, |
252 | bool direction, bool sync) {} | |
a11cdaa7 | 253 | static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
cdc1184c | 254 | struct blkio_group *curr_blkg, bool direction, bool sync) {} |
a11cdaa7 | 255 | static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
cdc1184c | 256 | bool direction, bool sync) {} |
31e4c28d VG |
257 | #endif |
258 | #endif /* _BLK_CGROUP_H */ |