From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>,
[email protected], [email protected]
Subject: [PATCH v2 5/8] io_uring: inline llist_add()
Date: Thu, 6 Apr 2023 14:20:11 +0100 [thread overview]
Message-ID: <f0165493af7b379943c792114b972f331e7d7d10.1680782017.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>
We'll need to grab some information from the previous request in the tw
list, inline llist_add(), it'll be used in the following patch.
Signed-off-by: Pavel Begunkov <[email protected]>
---
io_uring/io_uring.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 6f175fe682e4..786ecfa01c54 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1303,8 +1303,15 @@ static __cold void io_fallback_tw(struct io_uring_task *tctx)
static void io_req_local_work_add(struct io_kiocb *req)
{
struct io_ring_ctx *ctx = req->ctx;
+ struct llist_node *first;
- if (!llist_add(&req->io_task_work.node, &ctx->work_llist))
+ first = READ_ONCE(ctx->work_llist.first);
+ do {
+ req->io_task_work.node.next = first;
+ } while (!try_cmpxchg(&ctx->work_llist.first, &first,
+ &req->io_task_work.node));
+
+ if (first)
return;
/* needed for the following wake up */
--
2.40.0
next prev parent reply other threads:[~2023-04-06 13:21 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-06 13:20 [PATCH v2 0/8] optimise resheduling due to deferred tw Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 1/8] io_uring: move pinning out of io_req_local_work_add Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 2/8] io_uring: optimie local tw add ctx pinning Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 3/8] io_uring: refactor __io_cq_unlock_post_flush() Pavel Begunkov
2023-04-06 14:23 ` Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 4/8] io_uring: add tw add flags Pavel Begunkov
2023-04-06 13:20 ` Pavel Begunkov [this message]
2023-04-06 13:20 ` [PATCH v2 6/8] io_uring: reduce scheduling due to tw Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 7/8] io_uring: refactor __io_cq_unlock_post_flush() Pavel Begunkov
2023-04-06 13:20 ` [PATCH v2 8/8] io_uring: optimise io_req_local_work_add Pavel Begunkov
2023-04-12 1:53 ` [PATCH v2 0/8] optimise resheduling due to deferred tw Jens Axboe
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