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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH 14/23] io_uring: don't pass tail into io_free_batch_list
Date: Fri, 24 Sep 2021 17:31:52 +0100	[thread overview]
Message-ID: <87c5633e7220f4dc453521f2e83293aed961ec5f.1632500264.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

io_free_batch_list() iterates all requests in the passed in list,
so we don't really need to know the tail but can keep iterating until
meet NULL. Just pass the first node into it and it will be enough.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index e1637ea4db4c..1d14d85377b5 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2267,14 +2267,12 @@ static void io_free_req_work(struct io_kiocb *req, bool *locked)
 }
 
 static void io_free_batch_list(struct io_ring_ctx *ctx,
-			       struct io_wq_work_list *list)
+				struct io_wq_work_node *node)
 	__must_hold(&ctx->uring_lock)
 {
-	struct io_wq_work_node *node;
 	struct task_struct *task = NULL;
 	int task_refs = 0, ctx_refs = 0;
 
-	node = list->first;
 	do {
 		struct io_kiocb *req = container_of(node, struct io_kiocb,
 						    comp_list);
@@ -2321,7 +2319,7 @@ static void __io_submit_flush_completions(struct io_ring_ctx *ctx)
 	spin_unlock(&ctx->completion_lock);
 	io_cqring_ev_posted(ctx);
 
-	io_free_batch_list(ctx, &state->compl_reqs);
+	io_free_batch_list(ctx, state->compl_reqs.first);
 	INIT_WQ_LIST(&state->compl_reqs);
 }
 
@@ -2404,7 +2402,6 @@ static inline bool io_run_task_work(void)
 static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
 {
 	struct io_wq_work_node *pos, *start, *prev;
-	struct io_wq_work_list list;
 	int nr_events = 0;
 	bool spin;
 
@@ -2458,10 +2455,9 @@ static int io_do_iopoll(struct io_ring_ctx *ctx, bool force_nonspin)
 
 	io_commit_cqring(ctx);
 	io_cqring_ev_posted_iopoll(ctx);
-	list.first = start ? start->next : ctx->iopoll_list.first;
-	list.last = prev;
+	pos = start ? start->next : ctx->iopoll_list.first;
 	wq_list_cut(&ctx->iopoll_list, prev, start);
-	io_free_batch_list(ctx, &list);
+	io_free_batch_list(ctx, pos);
 	return nr_events;
 }
 
-- 
2.33.0


  parent reply	other threads:[~2021-09-24 16:36 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 16:31 [RFC][PATCHSET 00/23] rework/optimise submission+completion paths Pavel Begunkov
2021-09-24 16:31 ` [PATCH 01/23] io_uring: mark having different creds unlikely Pavel Begunkov
2021-09-24 16:31 ` [PATCH 02/23] io_uring: force_nonspin Pavel Begunkov
2021-09-24 16:31 ` [PATCH 03/23] io_uring: make io_do_iopoll return number of reqs Pavel Begunkov
2021-09-24 16:31 ` [PATCH 04/23] io_uring: use slist for completion batching Pavel Begunkov
2021-09-24 16:31 ` [PATCH 05/23] io_uring: remove allocation cache array Pavel Begunkov
2021-09-24 16:31 ` [PATCH 06/23] io-wq: add io_wq_work_node based stack Pavel Begunkov
2021-09-24 16:31 ` [PATCH 07/23] io_uring: replace list with stack for req caches Pavel Begunkov
2021-09-24 16:31 ` [PATCH 08/23] io_uring: split iopoll loop Pavel Begunkov
2021-09-24 16:31 ` [PATCH 09/23] io_uring: use single linked list for iopoll Pavel Begunkov
2021-09-24 16:31 ` [PATCH 10/23] io_uring: add a helper for batch free Pavel Begunkov
2021-09-24 16:31 ` [PATCH 11/23] io_uring: convert iopoll_completed to store_release Pavel Begunkov
2021-09-24 16:31 ` [PATCH 12/23] io_uring: optimise batch completion Pavel Begunkov
2021-09-24 16:31 ` [PATCH 13/23] io_uring: inline completion batching helpers Pavel Begunkov
2021-09-24 16:31 ` Pavel Begunkov [this message]
2021-09-24 16:31 ` [PATCH 15/23] io_uring: don't pass state to io_submit_state_end Pavel Begunkov
2021-09-24 16:31 ` [PATCH 16/23] io_uring: deduplicate io_queue_sqe() call sites Pavel Begunkov
2021-09-24 16:31 ` [PATCH 17/23] io_uring: remove drain_active check from hot path Pavel Begunkov
2021-09-24 16:31 ` [PATCH 18/23] io_uring: split slow path from io_queue_sqe Pavel Begunkov
2021-09-24 16:31 ` [PATCH 19/23] io_uring: inline hot path of __io_queue_sqe() Pavel Begunkov
2021-09-24 16:31 ` [PATCH 20/23] io_uring: reshuffle queue_sqe completion handling Pavel Begunkov
2021-09-24 16:31 ` [PATCH 21/23] io_uring: restructure submit sqes to_submit checks Pavel Begunkov
2021-09-24 16:32 ` [PATCH 22/23] io_uring: kill off ->inflight_entry field Pavel Begunkov
2021-09-24 16:32 ` [PATCH 23/23] io_uring: comment why inline complete calls io_clean_op() Pavel Begunkov

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