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SubjectRe: [RFC][PATCH 1/6] memcg: fix pre_destory handler
On Wed, 10 Dec 2008 11:00:35 -0800
Paul Menage <> wrote:

> On Wed, Dec 10, 2008 at 10:35 AM, Paul Menage <> wrote:
> > On Wed, Dec 10, 2008 at 3:29 AM, KAMEZAWA Hiroyuki
> > <> wrote:
> >>
> >> (BTW, I don't like hierarchy-walk-by-small-locks approarch now because
> >> I'd like to implement scan-and-stop-continue routine.
> >> See how readdir() aginst /proc scans PID. It's very roboust against
> >> very temporal PIDs.)
> >
> > So you mean that you want to be able to sleep, and then contine
> > approximately where you left off, without keeping any kind of
> > reference count on the last cgroup that you touched? OK, so in that
> > case I agree that you would need some kind of hierarch
> Oops, didn't finish that sentence.
> I agree that you'd need some kind of hierarchical-restart. But I'd
> like to play with / look at your cgroup-id patch more closely and see
> if we can come up with something simpler that still does what you
> want.
Sure, I have to do, too. It's still too young.

> One particular problem with the patch as it stands is that the ids
> should be per-css, not per-cgroup, since a css can move between
> hierarchies and hence between cgroups. (Currently only at bind/unbind
> time, but it still results in a cgroup change).

If per-css, looking up function will be
struct cgroup_subsys_state *cgroup_css_lookup(subsys_id, id)
Do you mean this ?

ok, I'll implement and see what happens. Maybe I'll move hooks to prepare/destroy IDs
to subsys layer and assign ID only when subsys want IDs.


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