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authorWaiman Long <longman@redhat.com>2022-11-04 20:59:02 -0400
committerJens Axboe <axboe@kernel.dk>2022-11-16 16:58:44 -0700
commitdae590a6c96c799434e0ff8156ef29b88c257e60 (patch)
tree47cc80856cb5e7b653e9ba8a70899b04c83ed850 /fs/crypto
parent3b8cc6298724021da845f2f9fd7dd4b6829a6817 (diff)
blk-cgroup: Flush stats at blkgs destruction path
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 from being freed until some other events cause cgroup_rstat_flush() to be called to flush out the pending blkcg stats. To prevent this delayed blkcg removal, add a new cgroup_rstat_css_flush() function to flush stats for a given css and cpu and call it at the blkgs destruction path, blkcg_destroy_blkgs(), whenever there are still some pending stats to be flushed. This will ensure that blkcg reference count can reach 0 ASAP. Signed-off-by: Waiman Long <longman@redhat.com> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20221105005902.407297-4-longman@redhat.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/crypto')
0 files changed, 0 insertions, 0 deletions