Commit 8bab4c09 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring: allow conditional reschedule for intensive iterators 

If we have a lot of threads and rings, the tctx list can get quite big.
This is especially true if we keep creating new threads and rings.
Likewise for the provided buffers list. Be nice and insert a conditional
reschedule point while iterating the nodes for deletion.

Link: https://lore.kernel.org/io-uring/00000000000064b6b405ccb41113@google.com/


Reported-by: default avatar <syzbot+111d2a03f51f5ae73775@syzkaller.appspotmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 5b7aa38d

fs/io_uring.c

+6 −2
Original line number Diff line number Diff line
@@ -9173,8 +9173,10 @@ static void io_destroy_buffers(struct io_ring_ctx *ctx) 
	struct io_buffer *buf;

	unsigned long index;



	xa_for_each(&ctx->io_buffers, index, buf)

	xa_for_each(&ctx->io_buffers, index, buf) {

		__io_remove_buffers(ctx, buf, index, -1U);

		cond_resched();

	}

}



static void io_req_cache_free(struct list_head *list)
@@ -9672,8 +9674,10 @@ static void io_uring_clean_tctx(struct io_uring_task *tctx) 
	struct io_tctx_node *node;

	unsigned long index;



	xa_for_each(&tctx->xa, index, node)

	xa_for_each(&tctx->xa, index, node) {

		io_uring_del_tctx_node(index);

		cond_resched();

	}

	if (wq) {

		/*

		 * Must be after io_uring_del_task_file() (removes nodes under