| #ifndef _BLK_CGROUP_H |
| #define _BLK_CGROUP_H |
| /* |
| * Common Block IO controller cgroup interface |
| * |
| * Based on ideas and code from CFQ, CFS and BFQ: |
| * Copyright (C) 2003 Jens Axboe <axboe@kernel.dk> |
| * |
| * Copyright (C) 2008 Fabio Checconi <fabio@gandalf.sssup.it> |
| * Paolo Valente <paolo.valente@unimore.it> |
| * |
| * Copyright (C) 2009 Vivek Goyal <vgoyal@redhat.com> |
| * Nauman Rafique <nauman@google.com> |
| */ |
| |
| #include <linux/cgroup.h> |
| |
| enum blkio_policy_id { |
| BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */ |
| BLKIO_POLICY_THROTL, /* Throttling */ |
| }; |
| |
| #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
| |
| #ifndef CONFIG_BLK_CGROUP |
| /* When blk-cgroup is a module, its subsys_id isn't a compile-time constant */ |
| extern struct cgroup_subsys blkio_subsys; |
| #define blkio_subsys_id blkio_subsys.subsys_id |
| #endif |
| |
| enum stat_type { |
| /* Total time spent (in ns) between request dispatch to the driver and |
| * request completion for IOs doen by this cgroup. This may not be |
| * accurate when NCQ is turned on. */ |
| BLKIO_STAT_SERVICE_TIME = 0, |
| /* Total bytes transferred */ |
| BLKIO_STAT_SERVICE_BYTES, |
| /* Total IOs serviced, post merge */ |
| BLKIO_STAT_SERVICED, |
| /* Total time spent waiting in scheduler queue in ns */ |
| BLKIO_STAT_WAIT_TIME, |
| /* Number of IOs merged */ |
| BLKIO_STAT_MERGED, |
| /* Number of IOs queued up */ |
| BLKIO_STAT_QUEUED, |
| /* All the single valued stats go below this */ |
| BLKIO_STAT_TIME, |
| BLKIO_STAT_SECTORS, |
| #ifdef CONFIG_DEBUG_BLK_CGROUP |
| BLKIO_STAT_AVG_QUEUE_SIZE, |
| BLKIO_STAT_IDLE_TIME, |
| BLKIO_STAT_EMPTY_TIME, |
| BLKIO_STAT_GROUP_WAIT_TIME, |
| BLKIO_STAT_DEQUEUE |
| #endif |
| }; |
| |
| enum stat_sub_type { |
| BLKIO_STAT_READ = 0, |
| BLKIO_STAT_WRITE, |
| BLKIO_STAT_SYNC, |
| BLKIO_STAT_ASYNC, |
| BLKIO_STAT_TOTAL |
| }; |
| |
| /* blkg state flags */ |
| enum blkg_state_flags { |
| BLKG_waiting = 0, |
| BLKG_idling, |
| BLKG_empty, |
| }; |
| |
| /* cgroup files owned by proportional weight policy */ |
| enum blkcg_file_name_prop { |
| BLKIO_PROP_weight = 1, |
| BLKIO_PROP_weight_device, |
| BLKIO_PROP_io_service_bytes, |
| BLKIO_PROP_io_serviced, |
| BLKIO_PROP_time, |
| BLKIO_PROP_sectors, |
| BLKIO_PROP_io_service_time, |
| BLKIO_PROP_io_wait_time, |
| BLKIO_PROP_io_merged, |
| BLKIO_PROP_io_queued, |
| BLKIO_PROP_avg_queue_size, |
| BLKIO_PROP_group_wait_time, |
| BLKIO_PROP_idle_time, |
| BLKIO_PROP_empty_time, |
| BLKIO_PROP_dequeue, |
| }; |
| |
| /* cgroup files owned by throttle policy */ |
| enum blkcg_file_name_throtl { |
| BLKIO_THROTL_read_bps_device, |
| BLKIO_THROTL_write_bps_device, |
| BLKIO_THROTL_io_service_bytes, |
| BLKIO_THROTL_io_serviced, |
| }; |
| |
| struct blkio_cgroup { |
| struct cgroup_subsys_state css; |
| unsigned int weight; |
| spinlock_t lock; |
| struct hlist_head blkg_list; |
| struct list_head policy_list; /* list of blkio_policy_node */ |
| }; |
| |
| struct blkio_group_stats { |
| /* total disk time and nr sectors dispatched by this group */ |
| uint64_t time; |
| uint64_t sectors; |
| uint64_t stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL]; |
| #ifdef CONFIG_DEBUG_BLK_CGROUP |
| /* Sum of number of IOs queued across all samples */ |
| uint64_t avg_queue_size_sum; |
| /* Count of samples taken for average */ |
| uint64_t avg_queue_size_samples; |
| /* How many times this group has been removed from service tree */ |
| unsigned long dequeue; |
| |
| /* Total time spent waiting for it to be assigned a timeslice. */ |
| uint64_t group_wait_time; |
| uint64_t start_group_wait_time; |
| |
| /* Time spent idling for this blkio_group */ |
| uint64_t idle_time; |
| uint64_t start_idle_time; |
| /* |
| * Total time when we have requests queued and do not contain the |
| * current active queue. |
| */ |
| uint64_t empty_time; |
| uint64_t start_empty_time; |
| uint16_t flags; |
| #endif |
| }; |
| |
| struct blkio_group { |
| /* An rcu protected unique identifier for the group */ |
| void *key; |
| struct hlist_node blkcg_node; |
| unsigned short blkcg_id; |
| /* Store cgroup path */ |
| char path[128]; |
| /* The device MKDEV(major, minor), this group has been created for */ |
| dev_t dev; |
| /* policy which owns this blk group */ |
| enum blkio_policy_id plid; |
| |
| /* Need to serialize the stats in the case of reset/update */ |
| spinlock_t stats_lock; |
| struct blkio_group_stats stats; |
| }; |
| |
| struct blkio_policy_node { |
| struct list_head node; |
| dev_t dev; |
| /* This node belongs to max bw policy or porportional weight policy */ |
| enum blkio_policy_id plid; |
| /* cgroup file to which this rule belongs to */ |
| int fileid; |
| |
| union { |
| unsigned int weight; |
| /* |
| * Rate read/write in terms of byptes per second |
| * Whether this rate represents read or write is determined |
| * by file type "fileid". |
| */ |
| u64 bps; |
| } val; |
| }; |
| |
| extern unsigned int blkcg_get_weight(struct blkio_cgroup *blkcg, |
| dev_t dev); |
| extern uint64_t blkcg_get_read_bps(struct blkio_cgroup *blkcg, |
| dev_t dev); |
| extern uint64_t blkcg_get_write_bps(struct blkio_cgroup *blkcg, |
| dev_t dev); |
| |
| typedef void (blkio_unlink_group_fn) (void *key, struct blkio_group *blkg); |
| typedef void (blkio_update_group_weight_fn) (struct blkio_group *blkg, |
| unsigned int weight); |
| typedef void (blkio_update_group_read_bps_fn) (struct blkio_group *blkg, |
| u64 read_bps); |
| typedef void (blkio_update_group_write_bps_fn) (struct blkio_group *blkg, |
| u64 write_bps); |
| |
| struct blkio_policy_ops { |
| blkio_unlink_group_fn *blkio_unlink_group_fn; |
| blkio_update_group_weight_fn *blkio_update_group_weight_fn; |
| blkio_update_group_read_bps_fn *blkio_update_group_read_bps_fn; |
| blkio_update_group_write_bps_fn *blkio_update_group_write_bps_fn; |
| }; |
| |
| struct blkio_policy_type { |
| struct list_head list; |
| struct blkio_policy_ops ops; |
| enum blkio_policy_id plid; |
| }; |
| |
| /* Blkio controller policy registration */ |
| extern void blkio_policy_register(struct blkio_policy_type *); |
| extern void blkio_policy_unregister(struct blkio_policy_type *); |
| |
| static inline char *blkg_path(struct blkio_group *blkg) |
| { |
| return blkg->path; |
| } |
| |
| #else |
| |
| struct blkio_group { |
| }; |
| |
| struct blkio_policy_type { |
| }; |
| |
| static inline void blkio_policy_register(struct blkio_policy_type *blkiop) { } |
| static inline void blkio_policy_unregister(struct blkio_policy_type *blkiop) { } |
| |
| static inline char *blkg_path(struct blkio_group *blkg) { return NULL; } |
| |
| #endif |
| |
| #define BLKIO_WEIGHT_MIN 100 |
| #define BLKIO_WEIGHT_MAX 1000 |
| #define BLKIO_WEIGHT_DEFAULT 500 |
| |
| #ifdef CONFIG_DEBUG_BLK_CGROUP |
| void blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg); |
| void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
| unsigned long dequeue); |
| void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg); |
| void blkiocg_update_idle_time_stats(struct blkio_group *blkg); |
| void blkiocg_set_start_empty_time(struct blkio_group *blkg); |
| |
| #define BLKG_FLAG_FNS(name) \ |
| static inline void blkio_mark_blkg_##name( \ |
| struct blkio_group_stats *stats) \ |
| { \ |
| stats->flags |= (1 << BLKG_##name); \ |
| } \ |
| static inline void blkio_clear_blkg_##name( \ |
| struct blkio_group_stats *stats) \ |
| { \ |
| stats->flags &= ~(1 << BLKG_##name); \ |
| } \ |
| static inline int blkio_blkg_##name(struct blkio_group_stats *stats) \ |
| { \ |
| return (stats->flags & (1 << BLKG_##name)) != 0; \ |
| } \ |
| |
| BLKG_FLAG_FNS(waiting) |
| BLKG_FLAG_FNS(idling) |
| BLKG_FLAG_FNS(empty) |
| #undef BLKG_FLAG_FNS |
| #else |
| static inline void blkiocg_update_avg_queue_size_stats( |
| struct blkio_group *blkg) {} |
| static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg, |
| unsigned long dequeue) {} |
| static inline void blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) |
| {} |
| static inline void blkiocg_update_idle_time_stats(struct blkio_group *blkg) {} |
| static inline void blkiocg_set_start_empty_time(struct blkio_group *blkg) {} |
| #endif |
| |
| #if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE) |
| extern struct blkio_cgroup blkio_root_cgroup; |
| extern struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup); |
| extern void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| struct blkio_group *blkg, void *key, dev_t dev, |
| enum blkio_policy_id plid); |
| extern int blkiocg_del_blkio_group(struct blkio_group *blkg); |
| extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg, |
| void *key); |
| void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
| unsigned long time); |
| void blkiocg_update_dispatch_stats(struct blkio_group *blkg, uint64_t bytes, |
| bool direction, bool sync); |
| void blkiocg_update_completion_stats(struct blkio_group *blkg, |
| uint64_t start_time, uint64_t io_start_time, bool direction, bool sync); |
| void blkiocg_update_io_merged_stats(struct blkio_group *blkg, bool direction, |
| bool sync); |
| void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
| struct blkio_group *curr_blkg, bool direction, bool sync); |
| void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
| bool direction, bool sync); |
| #else |
| struct cgroup; |
| static inline struct blkio_cgroup * |
| cgroup_to_blkio_cgroup(struct cgroup *cgroup) { return NULL; } |
| |
| static inline void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg, |
| struct blkio_group *blkg, void *key, dev_t dev, |
| enum blkio_policy_id plid) {} |
| |
| static inline int |
| blkiocg_del_blkio_group(struct blkio_group *blkg) { return 0; } |
| |
| static inline struct blkio_group * |
| blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; } |
| static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg, |
| unsigned long time) {} |
| static inline void blkiocg_update_dispatch_stats(struct blkio_group *blkg, |
| uint64_t bytes, bool direction, bool sync) {} |
| static inline void blkiocg_update_completion_stats(struct blkio_group *blkg, |
| uint64_t start_time, uint64_t io_start_time, bool direction, |
| bool sync) {} |
| static inline void blkiocg_update_io_merged_stats(struct blkio_group *blkg, |
| bool direction, bool sync) {} |
| static inline void blkiocg_update_io_add_stats(struct blkio_group *blkg, |
| struct blkio_group *curr_blkg, bool direction, bool sync) {} |
| static inline void blkiocg_update_io_remove_stats(struct blkio_group *blkg, |
| bool direction, bool sync) {} |
| #endif |
| #endif /* _BLK_CGROUP_H */ |