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io_uring: return back links tw run optimisation

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io_submit_flush_completions() may queue new requests for tw execution,
especially true for linked requests. Recheck the tw list for emptiness
after flushing completions.

Note that this doesn't really fix the commit referenced below, but it
does reinstate an optimization that existed before that got merged.

Fixes: f88262e60b ("io_uring: lockless task list")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/6328acdbb5e60efc762b18003382de077e6e1367.1673887636.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2023-01-16 16:48:57 +00:00 committed by Jens Axboe
parent 88b80534f6
commit b0b7a7d24b
1 changed files with 4 additions and 1 deletions
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5
io_uring/io_uring.c
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@ -1344,8 +1344,11 @@ static int __io_run_local_work(struct io_ring_ctx *ctx, bool *locked)
if (!llist_empty(&ctx->work_llist))
goto again;
if (*locked)
if (*locked) {
io_submit_flush_completions(ctx);
if (!llist_empty(&ctx->work_llist))
goto again;
}
trace_io_uring_local_work_run(ctx, ret, loops);
return ret;
}