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io_uring: don't count rqs failed after current one 

When checking for draining with __req_need_defer(), it tries to match
how many requests were sent before a current one with number of already
completed. Dropped SQEs are included in req->sequence, and they won't
ever appear in CQ. To compensate for that, __req_need_defer() substracts
ctx->cached_sq_dropped.
However, what it should really use is number of SQEs dropped __before__
the current one. In other words, any submitted request shouldn't
shouldn't affect dequeueing from the drain queue of previously submitted
ones.

Instead of saving proper ctx->cached_sq_dropped in each request,
substract from req->sequence it at initialisation, so it includes number
of properly submitted requests.

note: it also changes behaviour of timeouts, but
1. it's already diverge from the description because of using SQ
2. the description is ambiguous regarding dropped SQEs

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-04-15 00:39:50 +03:00 committed by Jens Axboe
parent b55ce73200
commit 31af27c7cc
1 changed files with 3 additions and 3 deletions
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6
fs/io_uring.c
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@ -957,8 +957,8 @@ static inline bool __req_need_defer(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
return req->sequence != ctx->cached_cq_tail + ctx->cached_sq_dropped
+ atomic_read(&ctx->cached_cq_overflow);
return req->sequence != ctx->cached_cq_tail
+ atomic_read(&ctx->cached_cq_overflow);
}
static inline bool req_need_defer(struct io_kiocb *req)
@ -5801,7 +5801,7 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
* it can be used to mark the position of the first IO in the
* link list.
*/
req->sequence = ctx->cached_sq_head;
req->sequence = ctx->cached_sq_head - ctx->cached_sq_dropped;
req->opcode = READ_ONCE(sqe->opcode);
req->user_data = READ_ONCE(sqe->user_data);
req->io = NULL;