Re: [PATCH v2 -next] blk-cgroup: synchoronize blkg creation against policy deactivation
From: Tejun Heo <tj@kernel.org>
Date: 2021-10-14 23:02:13
Also in:
linux-block, lkml
On Wed, Oct 13, 2021 at 08:44:56PM +0800, Yu Kuai wrote:
quoted hunk ↗ jump to hunk
@@ -1401,6 +1406,7 @@ void blkcg_deactivate_policy(struct request_queue *q, if (queue_is_mq(q)) blk_mq_freeze_queue(q); + mutex_lock(&q->blkg_lock); spin_lock_irq(&q->queue_lock);
Given that deactivation drains q_usage_counter through blk_mq_freeze_queue(), can't the blkg_conf_prep() just pin the usage count? Thanks. -- tejun