Re: [PATCH v2] memcg: debugging facility to access dangling memcgs.

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On Mon 03-12-12 15:44:20, Andrew Morton wrote:
> On Mon,  3 Dec 2012 17:24:08 +0400
> Glauber Costa <glommer@xxxxxxxxxxxxx> wrote:
> 
> > If memcg is tracking anything other than plain user memory (swap, tcp
> > buf mem, or slab memory), it is possible - and normal - that a reference
> > will be held by the group after it is dead. Still, for developers, it
> > would be extremely useful to be able to query about those states during
> > debugging.
> > 
> > This patch provides a debugging facility in the root memcg, so we can
> > inspect which memcgs still have pending objects, and what is the cause
> > of this state.
> 
> As this is a developer-only thing, I suggest that we should avoid
> burdening mainline with it.  How about we maintain this in -mm (and
> hence in -next and mhocko's memcg tree) until we no longer see a need
> for it?

Yes, that makes sense. It can produce some conflicts but they should be
trivial to resolve.

-- 
Michal Hocko
SUSE Labs
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