From: Pavel Begunkov Date: Thu, 15 Apr 2021 12:40:50 +0000 (+0100) Subject: io_uring: don't fail submit with overflow backlog X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c82d5bc703825a47af5c600e82e1e0c1db49e036;p=linux.git io_uring: don't fail submit with overflow backlog Don't fail submission attempts if there are CQEs in the overflow backlog, but give away the decision making to the userspace. It might be very inconvenient to the userspace, especially if submission and completion are done by different threads. We can remove it because of recent changes, where requests are now not locked by the backlog, backlog entries are allocated separately, so they take less space and cgroup accounted. Signed-off-by: Pavel Begunkov Signed-off-by: Jens Axboe --- diff --git a/fs/io_uring.c b/fs/io_uring.c index 55892e0227dd7..81bfe91aed0af 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -6664,12 +6664,6 @@ static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr) { int submitted = 0; - /* if we have a backlog and couldn't flush it all, return BUSY */ - if (test_bit(0, &ctx->sq_check_overflow)) { - if (!__io_cqring_overflow_flush(ctx, false)) - return -EBUSY; - } - /* make sure SQ entry isn't read before tail */ nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx));