Re: [RFC][PATCH 4/4] cgroup-memcg fix frequent EBUSY at rmdir

[Paul Menage]

On Tue, Jan 13, 2009 at 7:00 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
>
> Hmm, add wait_queue to css and wake it up at css_put() ?
>
> like this ?
> ==
> __css_put()
> {
>        if (atomi_dec_return(&css->refcnt) == 1) {
>                if (notify_on_release(cgrp) {
>                        .....
>                }
>                if (someone_waiting_rmdir(css)) {
>                        wake_up_him().
>                }
>        }
> }

Yes, something like that. A system-wide wake queue is probably fine though.

> pre_destroy() is for that.  Now, If there are still references from "page"
> after pre_destroy(), it's bug.

OK.

Paul
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