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
