#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> #include <linux/u64_stats_sync.h> enum blkio_policy_id { BLKIO_POLICY_PROP = 0, /* Proportional Bandwidth division */ BLKIO_POLICY_THROTL, /* Throttling */ }; /* Max limits for throttle policy */ #define THROTL_IOPS_MAX UINT_MAX #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 time spent waiting in scheduler queue in ns */ BLKIO_STAT_WAIT_TIME, /* Number of IOs queued up */ BLKIO_STAT_QUEUED, /* All the single valued stats go below this */ BLKIO_STAT_TIME, #ifdef CONFIG_DEBUG_BLK_CGROUP /* Time not charged to this cgroup */ BLKIO_STAT_UNACCOUNTED_TIME, BLKIO_STAT_AVG_QUEUE_SIZE, BLKIO_STAT_IDLE_TIME, BLKIO_STAT_EMPTY_TIME, BLKIO_STAT_GROUP_WAIT_TIME, BLKIO_STAT_DEQUEUE #endif }; /* Per cpu stats */ enum stat_type_cpu { BLKIO_STAT_CPU_SECTORS, /* Total bytes transferred */ BLKIO_STAT_CPU_SERVICE_BYTES, /* Total IOs serviced, post merge */ BLKIO_STAT_CPU_SERVICED, /* Number of IOs merged */ BLKIO_STAT_CPU_MERGED, BLKIO_STAT_CPU_NR }; 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_unaccounted_time, 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_read_iops_device, BLKIO_THROTL_write_iops_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 stat_arr[BLKIO_STAT_QUEUED + 1][BLKIO_STAT_TOTAL]; #ifdef CONFIG_DEBUG_BLK_CGROUP /* Time not charged to this cgroup */ uint64_t unaccounted_time; /* 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 }; /* Per cpu blkio group stats */ struct blkio_group_stats_cpu { uint64_t sectors; uint64_t stat_arr_cpu[BLKIO_STAT_CPU_NR][BLKIO_STAT_TOTAL]; struct u64_stats_sync syncp; }; 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; /* Per cpu stats pointer */ struct blkio_group_stats_cpu __percpu *stats_cpu; }; 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 bytes per second * Whether this rate represents read or write is determined * by file type "fileid". */ u64 bps; unsigned int iops; } 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); extern unsigned int blkcg_get_read_iops(struct blkio_cgroup *blkcg, dev_t dev); extern unsigned int blkcg_get_write_iops(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) (void *key, struct blkio_group *blkg, unsigned int weight); typedef void (blkio_update_group_read_bps_fn) (void * key, struct blkio_group *blkg, u64 read_bps); typedef void (blkio_update_group_write_bps_fn) (void *key, struct blkio_group *blkg, u64 write_bps); typedef void (blkio_update_group_read_iops_fn) (void *key, struct blkio_group *blkg, unsigned int read_iops); typedef void (blkio_update_group_write_iops_fn) (void *key, struct blkio_group *blkg, unsigned int write_iops); 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; blkio_update_group_read_iops_fn *blkio_update_group_read_iops_fn; blkio_update_group_write_iops_fn *blkio_update_group_write_iops_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 10 #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 struct blkio_cgroup *task_blkio_cgroup(struct task_struct *tsk); 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 blkio_alloc_blkg_stats(struct blkio_group *blkg); 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, unsigned long unaccounted_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 struct blkio_cgroup * task_blkio_cgroup(struct task_struct *tsk) { 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 blkio_alloc_blkg_stats(struct blkio_group *blkg) { return 0; } 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, unsigned long unaccounted_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 */