From: Hao Xu <[email protected]>
To: Jens Axboe <[email protected]>
Cc: [email protected], Pavel Begunkov <[email protected]>,
Joseph Qi <[email protected]>
Subject: [PATCH 7/8] io_uring: add tw_ctx for io_uring_task
Date: Mon, 27 Sep 2021 18:51:22 +0800 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
Add tw_ctx to represent whether there is only one ctx in
prior_task_list or not, this is useful in the next patch
Signed-off-by: Hao Xu <[email protected]>
---
fs/io_uring.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7f7b77a458d0..231d0a47025b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -477,6 +477,7 @@ struct io_uring_task {
struct io_wq_work_list task_list;
struct callback_head task_work;
struct io_wq_work_list prior_task_list;
+ struct io_ring_ctx *tw_ctx;
unsigned int nr;
unsigned int prior_nr;
bool task_running;
@@ -2224,6 +2225,10 @@ static void io_req_task_work_add(struct io_kiocb *req, bool emergency)
if (emergency && tctx->prior_nr * MAX_EMERGENCY_TW_RATIO < tctx->nr) {
wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list);
tctx->prior_nr++;
+ if (tctx->prior_nr == 1)
+ tctx->tw_ctx = req->ctx;
+ else if (tctx->tw_ctx && req->ctx != tctx->tw_ctx)
+ tctx->tw_ctx = NULL;
} else {
wq_list_add_tail(&req->io_task_work.node, &tctx->task_list);
}
@@ -2252,6 +2257,7 @@ static void io_req_task_work_add(struct io_kiocb *req, bool emergency)
spin_lock_irqsave(&tctx->task_lock, flags);
tctx->nr = tctx->prior_nr = 0;
+ tctx->tw_ctx = NULL;
tctx->task_running = false;
merged_list = wq_list_merge(&tctx->prior_task_list, &tctx->task_list);
node = merged_list->first;
--
2.24.4
next prev parent reply other threads:[~2021-09-27 10:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-27 10:51 [PATCH v2 0/8] task_work optimization Hao Xu
2021-09-27 10:51 ` [PATCH 1/8] io-wq: code clean for io_wq_add_work_after() Hao Xu
2021-09-27 10:51 ` [PATCH 2/8] io-wq: add helper to merge two wq_lists Hao Xu
2021-09-27 10:51 ` [PATCH 3/8] io_uring: add a limited tw list for irq completion work Hao Xu
2021-09-29 12:31 ` Hao Xu
2021-09-27 10:51 ` [PATCH 4/8] io_uring: add helper for task work execution code Hao Xu
2021-09-27 10:51 ` [PATCH 5/8] io_uring: split io_req_complete_post() and add a helper Hao Xu
2021-09-27 10:51 ` [PATCH 6/8] io_uring: move up io_put_kbuf() and io_put_rw_kbuf() Hao Xu
2021-09-27 10:51 ` Hao Xu [this message]
2021-09-27 10:51 ` [PATCH 8/8] io_uring: batch completion in prior_task_list Hao Xu
-- strict thread matches above, loose matches on Subject: below --
2021-09-27 6:17 [PATCH 0/6] task_work optimization Hao Xu
2021-09-27 6:17 ` [PATCH 7/8] io_uring: add tw_ctx for io_uring_task Hao Xu
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