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io_uring: submit-completion free batching 

io_submit_flush_completions() does completion batching, but may also use
free batching as iopoll does. The main beneficiaries should be buffered
reads/writes and send/recv.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-10 00:03:14 +00:00 committed by Jens Axboe
parent 6dd0be1e24
commit 905c172f32
1 changed files with 29 additions and 20 deletions
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49
fs/io_uring.c
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@ -1924,26 +1924,6 @@ static inline void io_req_complete_nostate(struct io_kiocb *req, long res,
io_put_req(req);
}
static void io_submit_flush_completions(struct io_comp_state *cs,
struct io_ring_ctx *ctx)
{
int i, nr = cs->nr;
spin_lock_irq(&ctx->completion_lock);
for (i = 0; i < nr; i++) {
struct io_kiocb *req = cs->reqs[i];
__io_cqring_fill_event(req, req->result, req->compl.cflags);
}
io_commit_cqring(ctx);
spin_unlock_irq(&ctx->completion_lock);
io_cqring_ev_posted(ctx);
for (i = 0; i < nr; i++)
io_double_put_req(cs->reqs[i]);
cs->nr = 0;
}
static void io_req_complete_state(struct io_kiocb *req, long res,
unsigned int cflags)
{
@ -2329,6 +2309,35 @@ static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req)
__io_req_free_batch_flush(req->ctx, rb);
}
static void io_submit_flush_completions(struct io_comp_state *cs,
struct io_ring_ctx *ctx)
{
int i, nr = cs->nr;
struct io_kiocb *req;
struct req_batch rb;
io_init_req_batch(&rb);
spin_lock_irq(&ctx->completion_lock);
for (i = 0; i < nr; i++) {
req = cs->reqs[i];
__io_cqring_fill_event(req, req->result, req->compl.cflags);
}
io_commit_cqring(ctx);
spin_unlock_irq(&ctx->completion_lock);
io_cqring_ev_posted(ctx);
for (i = 0; i < nr; i++) {
req = cs->reqs[i];
/* submission and completion refs */
if (refcount_sub_and_test(2, &req->refs))
io_req_free_batch(&rb, req);
}
io_req_free_batch_finish(ctx, &rb);
cs->nr = 0;
}
/*
* Drop reference to request, return next in chain (if there is one) if this
* was the last reference to this request.