Hi,
在 2025/8/15 22:47, Ming Lei 写道:
On Fri, Aug 15, 2025 at 04:02:10PM +0800, Yu Kuai wrote:
From: Yu Kuai <yukuai3@xxxxxxxxxx>
request_queue->nr_requests can be changed by:
a) switching elevator by update nr_hw_queues
b) switching elevator by elevator sysfs attribute
c) configue queue sysfs attribute nr_requests
->elevator_lock is grabbed for updating ->nr_requests except for queue
initialization, so what is the real problem you are trying to solve?
In order to fix the regression and prevent deadlock, we'll have to
allocate memory
in the case bitmap tags grow before freezing the queue, also prevent
nr_requests
to be updated by case a and b concurrently.
Thanks,
Kuai
Thanks,
Ming
