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io_uring: batch-free linked requests as well 

There is no reason to not batch deallocation of linked requests. Take
away its next req first and handle it as everything else in
io_req_multi_free().

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-06-28 12:52:32 +03:00 committed by Jens Axboe
parent 2757a23e7f
commit c352438333
1 changed files with 16 additions and 10 deletions
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26
fs/io_uring.c
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@ -1728,17 +1728,21 @@ static void io_req_task_queue(struct io_kiocb *req)
wake_up_process(tsk);
}
static void io_free_req(struct io_kiocb *req)
static void io_queue_next(struct io_kiocb *req)
{
struct io_kiocb *nxt = NULL;
io_req_find_next(req, &nxt);
__io_free_req(req);
if (nxt)
io_req_task_queue(nxt);
}
static void io_free_req(struct io_kiocb *req)
{
io_queue_next(req);
__io_free_req(req);
}
/*
* Drop reference to request, return next in chain (if there is one) if this
* was the last reference to this request.
@ -1835,16 +1839,19 @@ static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
}
static inline bool io_req_multi_free(struct req_batch *rb, struct io_kiocb *req)
static inline void io_req_multi_free(struct req_batch *rb, struct io_kiocb *req)
{
if ((req->flags & REQ_F_LINK_HEAD) || io_is_fallback_req(req))
return false;
if (unlikely(io_is_fallback_req(req))) {
io_free_req(req);
return;
}
if (req->flags & REQ_F_LINK_HEAD)
io_queue_next(req);
io_dismantle_req(req);
rb->reqs[rb->to_free++] = req;
if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs)))
io_free_req_many(req->ctx, rb);
return true;
}
static int io_put_kbuf(struct io_kiocb *req)
@ -1910,9 +1917,8 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
__io_cqring_fill_event(req, req->result, cflags);
(*nr_events)++;
if (refcount_dec_and_test(&req->refs) &&
!io_req_multi_free(&rb, req))
io_free_req(req);
if (refcount_dec_and_test(&req->refs))
io_req_multi_free(&rb, req);
}
io_commit_cqring(ctx);