linux-kernel - [PATCH V2 6/9] io_uring: switch to kernel

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Date:   Tue, 21 Sep 2021 16:52:15 -0500
From:   Mike Christie <michael.christie@...cle.com>
To:     hdanton@...a.com, hch@...radead.org, stefanha@...hat.com,
        jasowang@...hat.com, mst@...hat.com, sgarzare@...hat.com,
        virtualization@...ts.linux-foundation.org,
        christian.brauner@...ntu.com, axboe@...nel.dk,
        linux-kernel@...r.kernel.org
Cc:     Mike Christie <michael.christie@...cle.com>
Subject: [PATCH V2 6/9] io_uring: switch to kernel_worker

Convert io_uring and io-wq to use kernel_worker.

Signed-off-by: Mike Christie <michael.christie@...cle.com>
---
 fs/io-wq.c                 | 15 ++++++++-------
 fs/io_uring.c              | 11 +++++------
 include/linux/sched/task.h |  1 -
 3 files changed, 13 insertions(+), 14 deletions(-)

diff --git a/fs/io-wq.c b/fs/io-wq.c
index c2e0e8e80949..74e68132a227 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -69,6 +69,9 @@ struct io_worker {
 
 #define IO_WQ_NR_HASH_BUCKETS	(1u << IO_WQ_HASH_ORDER)
 
+#define IO_WQ_CLONE_FLAGS	(CLONE_FS | CLONE_FILES | CLONE_SIGHAND | \
+				 CLONE_THREAD | CLONE_IO)
+
 struct io_wqe_acct {
 	unsigned nr_workers;
 	unsigned max_workers;
@@ -549,13 +552,9 @@ static int io_wqe_worker(void *data)
 	struct io_wqe *wqe = worker->wqe;
 	struct io_wq *wq = wqe->wq;
 	bool last_timeout = false;
-	char buf[TASK_COMM_LEN];
 
 	worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
 
-	snprintf(buf, sizeof(buf), "iou-wrk-%d", wq->task->pid);
-	set_task_comm(current, buf);
-
 	while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
 		long ret;
 
@@ -652,7 +651,7 @@ static void io_init_new_worker(struct io_wqe *wqe, struct io_worker *worker,
 	list_add_tail_rcu(&worker->all_list, &wqe->all_list);
 	worker->flags |= IO_WORKER_F_FREE;
 	raw_spin_unlock(&wqe->lock);
-	wake_up_new_task(tsk);
+	kernel_worker_start(tsk, "iou-wrk-%d", wqe->wq->task->pid);
 }
 
 static bool io_wq_work_match_all(struct io_wq_work *work, void *data)
@@ -682,7 +681,8 @@ static void create_worker_cont(struct callback_head *cb)
 	worker = container_of(cb, struct io_worker, create_work);
 	clear_bit_unlock(0, &worker->create_state);
 	wqe = worker->wqe;
-	tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
+	tsk = kernel_worker(io_wqe_worker, worker, wqe->node,
+			    IO_WQ_CLONE_FLAGS, KERN_WORKER_IO);
 	if (!IS_ERR(tsk)) {
 		io_init_new_worker(wqe, worker, tsk);
 		io_worker_release(worker);
@@ -752,7 +752,8 @@ static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
 	if (index == IO_WQ_ACCT_BOUND)
 		worker->flags |= IO_WORKER_F_BOUND;
 
-	tsk = create_io_thread(io_wqe_worker, worker, wqe->node);
+	tsk = kernel_worker(io_wqe_worker, worker, wqe->node, IO_WQ_CLONE_FLAGS,
+			    KERN_WORKER_IO);
 	if (!IS_ERR(tsk)) {
 		io_init_new_worker(wqe, worker, tsk);
 	} else if (!io_should_retry_thread(PTR_ERR(tsk))) {
diff --git a/fs/io_uring.c b/fs/io_uring.c
index e372d5b9f6dc..1df7bec8bd76 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7393,12 +7393,8 @@ static int io_sq_thread(void *data)
 	struct io_sq_data *sqd = data;
 	struct io_ring_ctx *ctx;
 	unsigned long timeout = 0;
-	char buf[TASK_COMM_LEN];
 	DEFINE_WAIT(wait);
 
-	snprintf(buf, sizeof(buf), "iou-sqp-%d", sqd->task_pid);
-	set_task_comm(current, buf);
-
 	if (sqd->sq_cpu != -1)
 		set_cpus_allowed_ptr(current, cpumask_of(sqd->sq_cpu));
 	else
@@ -8580,6 +8576,8 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
 		fdput(f);
 	}
 	if (ctx->flags & IORING_SETUP_SQPOLL) {
+		unsigned long flags = CLONE_FS | CLONE_FILES | CLONE_SIGHAND |
+					CLONE_THREAD | CLONE_IO;
 		struct task_struct *tsk;
 		struct io_sq_data *sqd;
 		bool attached;
@@ -8621,7 +8619,8 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
 
 		sqd->task_pid = current->pid;
 		sqd->task_tgid = current->tgid;
-		tsk = create_io_thread(io_sq_thread, sqd, NUMA_NO_NODE);
+		tsk = kernel_worker(io_sq_thread, sqd, NUMA_NO_NODE,
+				    flags, KERN_WORKER_IO);
 		if (IS_ERR(tsk)) {
 			ret = PTR_ERR(tsk);
 			goto err_sqpoll;
@@ -8629,7 +8628,7 @@ static int io_sq_offload_create(struct io_ring_ctx *ctx,
 
 		sqd->thread = tsk;
 		ret = io_uring_alloc_task_context(tsk, ctx);
-		wake_up_new_task(tsk);
+		kernel_worker_start(tsk, "iou-sqp-%d", sqd->task_pid);
 		if (ret)
 			goto err;
 	} else if (p->flags & IORING_SETUP_SQ_AFF) {
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index ba0499b6627c..781abbc1c288 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h
@@ -87,7 +87,6 @@ extern void exit_files(struct task_struct *);
 extern void exit_itimers(struct signal_struct *);
 
 extern pid_t kernel_clone(struct kernel_clone_args *kargs);
-struct task_struct *create_io_thread(int (*fn)(void *i), void *arg, int node);
 struct task_struct *kernel_worker(int (*fn)(void *), void *arg, int node,
 				  unsigned long clone_flags, u32 worker_flags);
 __printf(2, 3)
-- 
2.25.1