On Thu, Jun 12, 2014 at 02:32:13PM +0800, Li Zefan wrote:
> @@ -1677,6 +1679,22 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type,
> goto out_unlock;
> }
>
> + /*
> + * If some subsystems have been bound to existing cgroup hierarchies,
> + * but those hierachies are being destroyed, let's wait a little bit
> + * and retry.
> + */
> + for_each_subsys(ss, i) {
> + if (!(opts.subsys_mask & (1 << i)))
> + continue;
> + if (!percpu_ref_alive(&ss->root->cgrp.self.refcnt)) {
Can't we just do tryget_live() instead and then put before retrying?
It's not exactly a hot path and the operations are dirt cheap anyway.
Thanks.
--
tejun
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