Re: [PATCH 01/15] blk-cgroup: don't defer blkg_free to a workqueue

[Yu Kuai <yukuai1@xxxxxxxxxxxxxxx>]

Hi, Christoph,

在 2023/01/24 14:57, Christoph Hellwig 写道:
> Now that blk_put_queue can be called from process context, there is no
> need for the asynchronous execution.
>
> This effectively reverts commit d578c770c85233af592e54537f93f3831bde7e9a.

blkg_free() can be called from rcu callback, and my patch

blk-cgroup: synchronize pd_free_fn() from blkg_free_workfn() and 
blkcg_deactivate_policy()

will hold a mutex in blkg_free_workfn(), I think it's better not do such
thing in rcu callback, right?

Thanks,
Kuai