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From:   Hao Xu <haoxu.linux@gmail.com>
To:     io-uring@vger.kernel.org
Cc:     Jens Axboe <axboe@kernel.dk>,
        Pavel Begunkov <asml.silence@gmail.com>,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/9] io-wq: add a worker flag for individual exit
Date:   Fri, 29 Apr 2022 18:18:50 +0800
Message-Id: <20220429101858.90282-2-haoxu.linux@gmail.com>
In-Reply-To: <20220429101858.90282-1-haoxu.linux@gmail.com>
References: <20220429101858.90282-1-haoxu.linux@gmail.com>
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From: Hao Xu <howeyxu@tencent.com>

Add a worker flag to control exit of an individual worker, this is
needed for fixed worker in the next patches but also as a generic
functionality.

Signed-off-by: Hao Xu <howeyxu@tencent.com>
---
 fs/io-wq.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index 824623bcf1a5..0c26805ca6de 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -26,6 +26,7 @@ enum {
 	IO_WORKER_F_RUNNING	= 2,	/* account as running */
 	IO_WORKER_F_FREE	= 4,	/* worker on free list */
 	IO_WORKER_F_BOUND	= 8,	/* is doing bounded work */
+	IO_WORKER_F_EXIT	= 32,	/* worker is exiting */
 };
 
 enum {
@@ -639,8 +640,12 @@ static int io_wqe_worker(void *data)
 	while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
 		long ret;
 
+		if (worker->flags & IO_WORKER_F_EXIT)
+			break;
+
 		set_current_state(TASK_INTERRUPTIBLE);
-		while (io_acct_run_queue(acct))
+		while (!(worker->flags & IO_WORKER_F_EXIT) &&
+		       io_acct_run_queue(acct))
 			io_worker_handle_work(worker);
 
 		raw_spin_lock(&wqe->lock);
@@ -656,6 +661,10 @@ static int io_wqe_worker(void *data)
 		raw_spin_unlock(&wqe->lock);
 		if (io_flush_signals())
 			continue;
+		if (worker->flags & IO_WORKER_F_EXIT) {
+			__set_current_state(TASK_RUNNING);
+			break;
+		}
 		ret = schedule_timeout(WORKER_IDLE_TIMEOUT);
 		if (signal_pending(current)) {
 			struct ksignal ksig;
-- 
2.36.0