io_uring: avoid indirect function calls for the hottest task_work

We use task_work for a variety of reasons, but doing completions or triggering rety after poll are by far the hottest two. Use the indirect funtion call wrappers to avoid the indirect function call if CONFIG_RETPOLINE is set. Signed-off-by: Jens Axboe <axboe@kernel.dk>
microsoft · Jun 2, 2023 · c92fcfc · c92fcfc
1 parent f026be0
commit c92fcfc
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Showing 5 changed files with 12 additions and 4 deletions.
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
@@ -95,6 +95,7 @@
 
 #include "timeout.h"
 #include "poll.h"
+#include "rw.h"
 #include "alloc_cache.h"
 
 #define IORING_MAX_ENTRIES	32768
@@ -1205,7 +1206,9 @@ static unsigned int handle_tw_list(struct llist_node *node,
 			ts->locked = mutex_trylock(&(*ctx)->uring_lock);
 			percpu_ref_get(&(*ctx)->refs);
 		}
-		req->io_task_work.func(req, ts);
+		INDIRECT_CALL_2(req->io_task_work.func,
+				io_poll_task_func, io_req_rw_complete,
+				req, ts);
 		node = next;
 		count++;
 		if (unlikely(need_resched())) {
@@ -1415,7 +1418,9 @@ static int __io_run_local_work(struct io_ring_ctx *ctx, struct io_tw_state *ts)
 		struct io_kiocb *req = container_of(node, struct io_kiocb,
 						    io_task_work.node);
 		prefetch(container_of(next, struct io_kiocb, io_task_work.node));
-		req->io_task_work.func(req, ts);
+		INDIRECT_CALL_2(req->io_task_work.func,
+				io_poll_task_func, io_req_rw_complete,
+				req, ts);
 		ret++;
 		node = next;
 	}

diff --git a/io_uring/poll.c b/io_uring/poll.c
@@ -326,7 +326,7 @@ static int io_poll_check_events(struct io_kiocb *req, struct io_tw_state *ts)
 	return IOU_POLL_NO_ACTION;
 }
 
-static void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts)
+void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts)
 {
 	int ret;
 

diff --git a/io_uring/poll.h b/io_uring/poll.h
@@ -38,3 +38,5 @@ bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
 			bool cancel_all);
 
 void io_apoll_cache_free(struct io_cache_entry *entry);
+
+void io_poll_task_func(struct io_kiocb *req, struct io_tw_state *ts);
diff --git a/io_uring/rw.c b/io_uring/rw.c
@@ -283,7 +283,7 @@ static inline int io_fixup_rw_res(struct io_kiocb *req, long res)
 	return res;
 }
 
-static void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts)
+void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts)
 {
 	io_req_io_end(req);
 

diff --git a/io_uring/rw.h b/io_uring/rw.h
@@ -22,3 +22,4 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags);
 int io_writev_prep_async(struct io_kiocb *req);
 void io_readv_writev_cleanup(struct io_kiocb *req);
 void io_rw_fail(struct io_kiocb *req);
+void io_req_rw_complete(struct io_kiocb *req, struct io_tw_state *ts);
Original file line number	Diff line number	Diff line change
Expand Up		@@ -38,3 +38,5 @@ bool io_poll_remove_all(struct io_ring_ctx ctx, struct task_struct tsk,
		bool cancel_all);

		void io_apoll_cache_free(struct io_cache_entry *entry);

		void io_poll_task_func(struct io_kiocb req, struct io_tw_state ts);