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io-wq: hash dependent work 

Enable io-wq hashing stuff for dependent works simply by re-enqueueing
such requests.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-03-14 00:31:05 +03:00 committed by Jens Axboe
parent 8766dd516c
commit 60cf46ae60
1 changed files with 19 additions and 6 deletions
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25
fs/io-wq.c
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@ -375,11 +375,17 @@ static bool __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker)
return __io_worker_unuse(wqe, worker);
}
static struct io_wq_work *io_get_next_work(struct io_wqe *wqe, unsigned *hash)
static inline unsigned int io_get_work_hash(struct io_wq_work *work)
{
return work->flags >> IO_WQ_HASH_SHIFT;
}
static struct io_wq_work *io_get_next_work(struct io_wqe *wqe)
__must_hold(wqe->lock)
{
struct io_wq_work_node *node, *prev;
struct io_wq_work *work;
unsigned int hash;
wq_list_for_each(node, prev, &wqe->work_list) {
work = container_of(node, struct io_wq_work, list);
@ -391,9 +397,9 @@ static struct io_wq_work *io_get_next_work(struct io_wqe *wqe, unsigned *hash)
}
/* hashed, can run if not already running */
*hash = work->flags >> IO_WQ_HASH_SHIFT;
if (!(wqe->hash_map & BIT(*hash))) {
wqe->hash_map |= BIT(*hash);
hash = io_get_work_hash(work);
if (!(wqe->hash_map & BIT(hash))) {
wqe->hash_map |= BIT(hash);
wq_node_del(&wqe->work_list, node, prev);
return work;
}
@ -470,15 +476,17 @@ static void io_assign_current_work(struct io_worker *worker,
spin_unlock_irq(&worker->lock);
}
static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work);
static void io_worker_handle_work(struct io_worker *worker)
__releases(wqe->lock)
{
struct io_wqe *wqe = worker->wqe;
struct io_wq *wq = wqe->wq;
unsigned hash = -1U;
do {
struct io_wq_work *work;
unsigned int hash;
get_next:
/*
* If we got some work, mark us as busy. If we didn't, but
@ -487,7 +495,7 @@ static void io_worker_handle_work(struct io_worker *worker)
* can't make progress, any work completion or insertion will
* clear the stalled flag.
*/
work = io_get_next_work(wqe, &hash);
work = io_get_next_work(wqe);
if (work)
__io_worker_busy(wqe, worker, work);
else if (!wq_list_empty(&wqe->work_list))
@ -511,11 +519,16 @@ static void io_worker_handle_work(struct io_worker *worker)
work->flags |= IO_WQ_WORK_CANCEL;
old_work = work;
hash = io_get_work_hash(work);
work->func(&work);
work = (old_work == work) ? NULL : work;
io_assign_current_work(worker, work);
wq->free_work(old_work);
if (work && io_wq_is_hashed(work)) {
io_wqe_enqueue(wqe, work);
work = NULL;
}
if (hash != -1U) {
spin_lock_irq(&wqe->lock);
wqe->hash_map &= ~BIT_ULL(hash);