Re: [PATCH V4] blk-cgroup: Flush stats before releasing blkcg_gq

On Sat, 10 Jun 2023 07:42:49 +0800, Ming Lei wrote:

As noted by Michal, the blkg_iostat_set's in the lockless list hold reference to blkg's to protect against their removal. Those blkg's hold reference to blkcg. When a cgroup is being destroyed, cgroup_rstat_flush() is only called at css_release_work_fn() which is called when the blkcg reference count reaches 0. This circular dependency will prevent blkcg and some blkgs from being freed after they are made offline.

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Applied, thanks!

[1/1] blk-cgroup: Flush stats before releasing blkcg_gq commit: 20cb1c2fb7568a6054c55defe044311397e01ddb

Best regards,