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From: Jens Axboe <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>
Subject: [PATCH 2/4] io_uring: rename 'in_idle' to 'in_cancel'
Date: Fri, 17 Feb 2023 08:55:58 -0700	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

This better describes what it does - it's incremented when the task is
currently undergoing a cancelation operation, due to exiting or exec'ing.

Signed-off-by: Jens Axboe <[email protected]>
---
 include/linux/io_uring_types.h |  2 +-
 io_uring/io_uring.c            | 18 +++++++++---------
 io_uring/tctx.c                |  2 +-
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index 0efe4d784358..00689c12f6ab 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -58,7 +58,7 @@ struct io_uring_task {
 
 	struct xarray			xa;
 	struct wait_queue_head		wait;
-	atomic_t			in_idle;
+	atomic_t			in_cancel;
 	atomic_t			inflight_tracked;
 	struct percpu_counter		inflight;
 
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index cbe06deb84ff..64e07df034d1 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -719,7 +719,7 @@ static void io_put_task_remote(struct task_struct *task, int nr)
 	struct io_uring_task *tctx = task->io_uring;
 
 	percpu_counter_sub(&tctx->inflight, nr);
-	if (unlikely(atomic_read(&tctx->in_idle)))
+	if (unlikely(atomic_read(&tctx->in_cancel)))
 		wake_up(&tctx->wait);
 	put_task_struct_many(task, nr);
 }
@@ -1258,8 +1258,8 @@ void tctx_task_work(struct callback_head *cb)
 
 	ctx_flush_and_put(ctx, &uring_locked);
 
-	/* relaxed read is enough as only the task itself sets ->in_idle */
-	if (unlikely(atomic_read(&tctx->in_idle)))
+	/* relaxed read is enough as only the task itself sets ->in_cancel */
+	if (unlikely(atomic_read(&tctx->in_cancel)))
 		io_uring_drop_tctx_refs(current);
 
 	trace_io_uring_task_work_run(tctx, count, loops);
@@ -1291,7 +1291,7 @@ static void io_req_local_work_add(struct io_kiocb *req)
 	/* needed for the following wake up */
 	smp_mb__after_atomic();
 
-	if (unlikely(atomic_read(&req->task->io_uring->in_idle))) {
+	if (unlikely(atomic_read(&req->task->io_uring->in_cancel))) {
 		io_move_task_work_from_local(ctx);
 		goto put_ref;
 	}
@@ -2937,12 +2937,12 @@ static __cold void io_tctx_exit_cb(struct callback_head *cb)
 
 	work = container_of(cb, struct io_tctx_exit, task_work);
 	/*
-	 * When @in_idle, we're in cancellation and it's racy to remove the
+	 * When @in_cancel, we're in cancellation and it's racy to remove the
 	 * node. It'll be removed by the end of cancellation, just ignore it.
 	 * tctx can be NULL if the queueing of this task_work raced with
 	 * work cancelation off the exec path.
 	 */
-	if (tctx && !atomic_read(&tctx->in_idle))
+	if (tctx && !atomic_read(&tctx->in_cancel))
 		io_uring_del_tctx_node((unsigned long)work->ctx);
 	complete(&work->completion);
 }
@@ -3210,7 +3210,7 @@ __cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd)
 	if (tctx->io_wq)
 		io_wq_exit_start(tctx->io_wq);
 
-	atomic_inc(&tctx->in_idle);
+	atomic_inc(&tctx->in_cancel);
 	do {
 		bool loop = false;
 
@@ -3261,9 +3261,9 @@ __cold void io_uring_cancel_generic(bool cancel_all, struct io_sq_data *sqd)
 	if (cancel_all) {
 		/*
 		 * We shouldn't run task_works after cancel, so just leave
-		 * ->in_idle set for normal exit.
+		 * ->in_cancel set for normal exit.
 		 */
-		atomic_dec(&tctx->in_idle);
+		atomic_dec(&tctx->in_cancel);
 		/* for exec all current's requests should be gone, kill tctx */
 		__io_uring_free(current);
 	}
diff --git a/io_uring/tctx.c b/io_uring/tctx.c
index 4324b1cf1f6a..3a8d1dd97e1b 100644
--- a/io_uring/tctx.c
+++ b/io_uring/tctx.c
@@ -83,7 +83,7 @@ __cold int io_uring_alloc_task_context(struct task_struct *task,
 
 	xa_init(&tctx->xa);
 	init_waitqueue_head(&tctx->wait);
-	atomic_set(&tctx->in_idle, 0);
+	atomic_set(&tctx->in_cancel, 0);
 	atomic_set(&tctx->inflight_tracked, 0);
 	task->io_uring = tctx;
 	init_llist_head(&tctx->task_list);
-- 
2.39.1


  parent reply	other threads:[~2023-02-17 15:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-17 15:55 [PATCH 0/4] Cache tctx cancelation state in the ctx Jens Axboe
2023-02-17 15:55 ` [PATCH 1/4] io_uring: consolidate the put_ref-and-return section of adding work Jens Axboe
2023-02-17 15:55 ` Jens Axboe [this message]
2023-02-17 15:55 ` [PATCH 3/4] io_uring: cache task cancelation state in the ctx Jens Axboe
2023-02-20 14:43   ` Gabriel Krisman Bertazi
2023-02-17 15:56 ` [PATCH 4/4] io_uring: use local ctx cancelation state for io_req_local_work_add() Jens Axboe

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