Commit 8766dd51 authored by Pavel Begunkov's avatar Pavel Begunkov Committed by Jens Axboe
Browse files

io-wq: split hashing and enqueueing 



It's a preparation patch removing io_wq_enqueue_hashed(), which
now should be done by io_wq_hash_work() + io_wq_enqueue().

Also, set hash value for dependant works, and do it as late as possible,
because req->file can be unavailable before. This hash will be ignored
by io-wq.

Signed-off-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent d78298e7

fs/io-wq.c

+5 −9
Original line number Diff line number Diff line
@@ -385,7 +385,7 @@ static struct io_wq_work *io_get_next_work(struct io_wqe *wqe, unsigned *hash) 
		work = container_of(node, struct io_wq_work, list);



		/* not hashed, can run anytime */

		if (!(work->flags & IO_WQ_WORK_HASHED)) {

		if (!io_wq_is_hashed(work)) {

			wq_node_del(&wqe->work_list, node, prev);

			return work;

		}
@@ -795,19 +795,15 @@ void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work) 
}



/*

 * Enqueue work, hashed by some key. Work items that hash to the same value

 * will not be done in parallel. Used to limit concurrent writes, generally

 * hashed by inode.

 * Work items that hash to the same value will not be done in parallel.

 * Used to limit concurrent writes, generally hashed by inode.

 */

void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val)

void io_wq_hash_work(struct io_wq_work *work, void *val)

{

	struct io_wqe *wqe = wq->wqes[numa_node_id()];

	unsigned bit;



	unsigned int bit;



	bit = hash_ptr(val, IO_WQ_HASH_ORDER);

	work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT));

	io_wqe_enqueue(wqe, work);

}



static bool io_wqe_worker_send_sig(struct io_worker *worker, void *data)

fs/io-wq.h

+6 −1
Original line number Diff line number Diff line
@@ -94,7 +94,12 @@ bool io_wq_get(struct io_wq *wq, struct io_wq_data *data); 
void io_wq_destroy(struct io_wq *wq);



void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);

void io_wq_enqueue_hashed(struct io_wq *wq, struct io_wq_work *work, void *val);

void io_wq_hash_work(struct io_wq_work *work, void *val);



static inline bool io_wq_is_hashed(struct io_wq_work *work)

{

	return work->flags & IO_WQ_WORK_HASHED;

}



void io_wq_cancel_all(struct io_wq *wq);

enum io_wq_cancel io_wq_cancel_work(struct io_wq *wq, struct io_wq_work *cwork);

fs/io_uring.c

+10 −14
Original line number Diff line number Diff line
@@ -1040,15 +1040,14 @@ static inline void io_req_work_drop_env(struct io_kiocb *req) 
	}

}



static inline bool io_prep_async_work(struct io_kiocb *req,

static inline void io_prep_async_work(struct io_kiocb *req,

				      struct io_kiocb **link)

{

	const struct io_op_def *def = &io_op_defs[req->opcode];

	bool do_hashed = false;



	if (req->flags & REQ_F_ISREG) {

		if (def->hash_reg_file)

			do_hashed = true;

			io_wq_hash_work(&req->work, file_inode(req->file));

	} else {

		if (def->unbound_nonreg_file)

			req->work.flags |= IO_WQ_WORK_UNBOUND;
@@ -1057,25 +1056,18 @@ static inline bool io_prep_async_work(struct io_kiocb *req, 
	io_req_work_grab_env(req, def);



	*link = io_prep_linked_timeout(req);

	return do_hashed;

}



static inline void io_queue_async_work(struct io_kiocb *req)

{

	struct io_ring_ctx *ctx = req->ctx;

	struct io_kiocb *link;

	bool do_hashed;



	do_hashed = io_prep_async_work(req, &link);

	io_prep_async_work(req, &link);



	trace_io_uring_queue_async_work(ctx, do_hashed, req, &req->work,

					req->flags);

	if (!do_hashed) {

	trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req,

					&req->work, req->flags);

	io_wq_enqueue(ctx->io_wq, &req->work);

	} else {

		io_wq_enqueue_hashed(ctx->io_wq, &req->work,

					file_inode(req->file));

	}



	if (link)

		io_queue_linked_timeout(link);
@@ -1582,6 +1574,10 @@ static void io_link_work_cb(struct io_wq_work **workptr) 
static void io_wq_assign_next(struct io_wq_work **workptr, struct io_kiocb *nxt)

{

	struct io_kiocb *link;

	const struct io_op_def *def = &io_op_defs[nxt->opcode];



	if ((nxt->flags & REQ_F_ISREG) && def->hash_reg_file)

		io_wq_hash_work(&nxt->work, file_inode(nxt->file));



	*workptr = &nxt->work;

	link = io_prep_linked_timeout(nxt);

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