From 8d4ad41e3e8e4b907f088f25aee4a92f3f864027 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 2 Sep 2021 00:38:23 +0100
Subject: [PATCH] io_uring: prolong tctx_task_work() with flushing
Git-commit: 8d4ad41e3e8e4b907f088f25aee4a92f3f864027
Patch-mainline: v5.15-rc1
References: bsc#1205205
io_submit_flush_completions() may enqueue linked requests for task_work
execution, so don't leave tctx_task_work() right after the tw list is
exhausted, but try to flush and then retry.
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/0755d4c2c36301447c63bdd4146c10477cea4249.1630539342.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
fs/io_uring.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9f3f8a802abd..3a7145a38653 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -2102,6 +2102,9 @@ static void tctx_task_work(struct callback_head *cb)
while (1) {
struct io_wq_work_node *node;
+ if (!tctx->task_list.first && locked && ctx->submit_state.compl_nr)
+ io_submit_flush_completions(ctx);
+
spin_lock_irq(&tctx->task_lock);
node = tctx->task_list.first;
INIT_WQ_LIST(&tctx->task_list);
--
2.35.3