From: Jackie Liu <liuyun01@xxxxxxxxxx> We don't need to set drain_next every time, make a small judgment and add unlikely, it looks like there will be a little optimization. Signed-off-by: Jackie Liu <liuyun01@xxxxxxxxxx> --- resend that patch, because reject by mail-list. fs/io_uring.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 013e5ed..f4ec44a 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2938,12 +2938,14 @@ static void __io_queue_sqe(struct io_kiocb *req) static void io_queue_sqe(struct io_kiocb *req) { int ret; + bool drain_link = req->flags & REQ_F_DRAIN_LINK; - if (unlikely(req->ctx->drain_next)) { + if (unlikely(req->ctx->drain_next && !drain_link)) { req->flags |= REQ_F_IO_DRAIN; req->ctx->drain_next = false; + } else if (unlikely(drain_link)) { + req->ctx->drain_next = true; } - req->ctx->drain_next = (req->flags & REQ_F_DRAIN_LINK); ret = io_req_defer(req); if (ret) { -- 2.7.4