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SubjectRe: [RFC][PATCH 0/4] memcg: add support for hwpoison testing
* Wu Fengguang <fengguang.wu@intel.com> [2009-09-01 16:55:49]:

> > My point is that memcg can show 'owner' of pages but the page may
> > be shared with something important task _and_ if a task is migrated,
> > its pages' memcg information is not updated now. Then, you can kill
> > a task which is not in memcg.
>
> Ah thanks! I'm not aware of that tricky fact, and it does make a
> very good reason not to use memcg, although I guess locked page won't
> be migrated.
>

I think what Kamezawa-San is pointing to is that the task can migrate,
leaving behind the page in the memcg and poisioning those pages can
kill a task outside the memcg.

--
Balbir


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