Re: [PATCH v7 0/6] cgroup, blkcg: prevent dirty inodes to pin dying memory cgroups

[Tejun Heo]

On Thu, Jun 03, 2021 at 06:31:53PM -0700, Roman Gushchin wrote:
> To solve the problem inodes should be eventually detached from the
> corresponding writeback structure. It's inefficient to do it after
> every writeback completion. Instead it can be done whenever the
> original memory cgroup is offlined and writeback structure is getting
> killed. Scanning over a (potentially long) list of inodes and detach
> them from the writeback structure can take quite some time. To avoid
> scanning all inodes, attached inodes are kept on a new list (b_attached).
> To make it less noticeable to a user, the scanning and switching is performed
> from a work context.

Sorry for chiming in late but the series looks great to me and the only
comment I have is the migration target on the last patch, which isn't a
critical issue. Please feel free to add

 Acked-by: Tejun Heo <tj@xxxxxxxxxx>

Thanks.

-- 
tejun