Add high priority workqueue, which added a new workqueue to btrfs_workqueue_struct.
Whether using the high priority workqueue must be decided at initialization. Signed-off-by: Qu Wenruo <[email protected]> --- Changelog: v1->v2: None v2->v3: None --- fs/btrfs/async-thread.c | 25 ++++++++++++++++++++++++- fs/btrfs/async-thread.h | 8 ++++++++ 2 files changed, 32 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c index 00b4913..925aa6d 100644 --- a/fs/btrfs/async-thread.c +++ b/fs/btrfs/async-thread.c @@ -731,6 +731,7 @@ void btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work) struct btrfs_workqueue_struct *btrfs_alloc_workqueue(char *name, char *ordered_name, + char *high_name, int flags, int max_active) { @@ -753,6 +754,19 @@ struct btrfs_workqueue_struct *btrfs_alloc_workqueue(char *name, } } + if (high_name) { + ret->high_wq = alloc_workqueue(high_name, + flags | WQ_HIGHPRI, + max_active); + if (unlikely(!ret->high_wq)) { + destroy_workqueue(ret->normal_wq); + if (ret->ordered_wq) + destroy_workqueue(ret->ordered_wq); + kfree(ret); + return NULL; + } + } + spin_lock_init(&ret->insert_lock); return ret; } @@ -793,8 +807,13 @@ void btrfs_queue_work(struct btrfs_workqueue_struct *wq, struct btrfs_work_struct *work) { unsigned long flags; + struct workqueue_struct *dest_wq; + if (work->high && wq->high_wq) + dest_wq = wq->high_wq; + else + dest_wq = wq->normal_wq; spin_lock_irqsave(&wq->insert_lock, flags); - queue_work(wq->normal_wq, &work->normal_work); + queue_work(dest_wq, &work->normal_work); if (wq->ordered_wq && work->ordered_func) queue_work(wq->ordered_wq, &work->ordered_work); spin_unlock_irqrestore(&wq->insert_lock, flags); @@ -804,10 +823,14 @@ void btrfs_destroy_workqueue(struct btrfs_workqueue_struct *wq) { if (wq->ordered_wq) destroy_workqueue(wq->ordered_wq); + if (wq->high_wq) + destroy_workqueue(wq->high_wq); destroy_workqueue(wq->normal_wq); } void btrfs_workqueue_set_max(struct btrfs_workqueue_struct *wq, int max) { workqueue_set_max_active(wq->normal_wq, max); + if (wq->high_wq) + workqueue_set_max_active(wq->high_wq, max); } diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h index eee6709..4863c38 100644 --- a/fs/btrfs/async-thread.h +++ b/fs/btrfs/async-thread.h @@ -123,6 +123,7 @@ void btrfs_set_work_high_prio(struct btrfs_work *work); struct btrfs_workqueue_struct { struct workqueue_struct *normal_wq; struct workqueue_struct *ordered_wq; + struct workqueue_struct *high_wq; /* * Spinlock to ensure that both ordered and normal work can @@ -141,17 +142,20 @@ struct btrfs_work_struct { struct work_struct normal_work; struct work_struct ordered_work; struct completion normal_completion; + int high; }; /* * ordered_name is optional. If not given(NULL), the ordered * workqueue will not be allocated and the ordered excution will not * be available. The behavior will not be changed after init. + * The same rule is applied to high_name. * * flags will use the WQ_ flags, ORed with WQ_UNBOUND. * */ struct btrfs_workqueue_struct *btrfs_alloc_workqueue(char *name, char *ordered_name, + char *high_name, int flags, int max_active); void btrfs_init_work(struct btrfs_work_struct *work, @@ -162,4 +166,8 @@ void btrfs_queue_work(struct btrfs_workqueue_struct *wq, struct btrfs_work_struct *work); void btrfs_destroy_workqueue(struct btrfs_workqueue_struct *wq); void btrfs_workqueue_set_max(struct btrfs_workqueue_struct *wq, int max); +static inline void btrfs_set_work_high_priority(struct btrfs_work_struct *work) +{ + work->high = 1; +} #endif -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
