diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/cfq-iosched.c | 111 |
1 files changed, 100 insertions, 11 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index 55d2a21..a877eee 100644 --- a/block/cfq-iosched.c +++ b/block/cfq-iosched.c @@ -189,6 +189,10 @@ struct cfq_group { unsigned long saved_workload_slice; enum wl_type_t saved_workload; enum wl_prio_t saved_serving_prio; + struct blkio_group blkg; +#ifdef CONFIG_CFQ_GROUP_IOSCHED + struct hlist_node cfqd_node; +#endif }; /* @@ -274,8 +278,13 @@ struct cfq_data { struct cfq_queue oom_cfqq; unsigned long last_end_sync_rq; + + /* List of cfq groups being managed on this device*/ + struct hlist_head cfqg_list; }; +static struct cfq_group *cfq_get_next_cfqg(struct cfq_data *cfqd); + static struct cfq_rb_root *service_tree_for(struct cfq_group *cfqg, enum wl_prio_t prio, enum wl_type_t type, @@ -881,6 +890,89 @@ static void cfq_group_served(struct cfq_data *cfqd, struct cfq_group *cfqg, cfqg->saved_workload_slice = 0; } +#ifdef CONFIG_CFQ_GROUP_IOSCHED +static inline struct cfq_group *cfqg_of_blkg(struct blkio_group *blkg) +{ + if (blkg) + return container_of(blkg, struct cfq_group, blkg); + return NULL; +} + +static struct cfq_group * +cfq_find_alloc_cfqg(struct cfq_data *cfqd, struct cgroup *cgroup, int create) +{ + struct blkio_cgroup *blkcg = cgroup_to_blkio_cgroup(cgroup); + struct cfq_group *cfqg = NULL; + void *key = cfqd; + int i, j; + struct cfq_rb_root *st; + + /* Do we need to take this reference */ + if (!css_tryget(&blkcg->css)) + return NULL;; + + cfqg = cfqg_of_blkg(blkiocg_lookup_group(blkcg, key)); + if (cfqg || !create) + goto done; + + cfqg = kzalloc_node(sizeof(*cfqg), GFP_ATOMIC, cfqd->queue->node); + if (!cfqg) + goto done; + + cfqg->weight = blkcg->weight; + for_each_cfqg_st(cfqg, i, j, st) + *st = CFQ_RB_ROOT; + RB_CLEAR_NODE(&cfqg->rb_node); + + /* Add group onto cgroup list */ + blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd); + + /* Add group on cfqd list */ + hlist_add_head(&cfqg->cfqd_node, &cfqd->cfqg_list); + +done: + css_put(&blkcg->css); + return cfqg; +} + +/* + * Search for the cfq group current task belongs to. If create = 1, then also + * create the cfq group if it does not exist. request_queue lock must be held. + */ +static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd, int create) +{ + struct cgroup *cgroup; + struct cfq_group *cfqg = NULL; + + rcu_read_lock(); + cgroup = task_cgroup(current, blkio_subsys_id); + cfqg = cfq_find_alloc_cfqg(cfqd, cgroup, create); + if (!cfqg && create) + cfqg = &cfqd->root_group; + rcu_read_unlock(); + return cfqg; +} + +static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) +{ + /* Currently, all async queues are mapped to root group */ + if (!cfq_cfqq_sync(cfqq)) + cfqg = &cfqq->cfqd->root_group; + + cfqq->cfqg = cfqg; +} +#else /* GROUP_IOSCHED */ +static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd, int create) +{ + return &cfqd->root_group; +} +static inline void +cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) { + cfqq->cfqg = cfqg; +} + +#endif /* GROUP_IOSCHED */ + /* * The cfqd->service_trees holds all pending cfq_queue's that have * requests waiting to be processed. It is sorted in the order that @@ -1372,7 +1464,7 @@ static struct cfq_queue *cfq_get_next_queue(struct cfq_data *cfqd) static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) { - struct cfq_group *cfqg = &cfqd->root_group; + struct cfq_group *cfqg; struct cfq_queue *cfqq; int i, j; struct cfq_rb_root *st; @@ -1380,6 +1472,10 @@ static struct cfq_queue *cfq_get_next_queue_forced(struct cfq_data *cfqd) if (!cfqd->rq_queued) return NULL; + cfqg = cfq_get_next_cfqg(cfqd); + if (!cfqg) + return NULL; + for_each_cfqg_st(cfqg, i, j, st) if ((cfqq = cfq_rb_first(st)) != NULL) return cfqq; @@ -2390,16 +2486,6 @@ static void cfq_init_cfqq(struct cfq_data *cfqd, struct cfq_queue *cfqq, cfqq->pid = pid; } -static void cfq_link_cfqq_cfqg(struct cfq_queue *cfqq, struct cfq_group *cfqg) -{ - cfqq->cfqg = cfqg; -} - -static struct cfq_group *cfq_get_cfqg(struct cfq_data *cfqd, int create) -{ - return &cfqd->root_group; -} - static struct cfq_queue * cfq_find_alloc_queue(struct cfq_data *cfqd, bool is_sync, struct io_context *ioc, gfp_t gfp_mask) @@ -3314,6 +3400,9 @@ static void *cfq_init_queue(struct request_queue *q) /* Give preference to root group over other groups */ cfqg->weight = 2*BLKIO_WEIGHT_DEFAULT; +#ifdef CONFIG_CFQ_GROUP_IOSCHED + blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd); +#endif /* * Not strictly needed (since RB_ROOT just clears the node and we * zeroed cfqd on alloc), but better be safe in case someone decides |
