Re: [PATCH 5/5] extend KSM refcounts to the anon_vma root

[Rik van Riel]

On 05/27/2010 10:02 AM, Minchan Kim wrote:

> Hmm, I can understand this point.
> Now, rmap code always depeneds on root anon_vma's lock.
> I think it doesn't depends on KSM and MIGRATION.
>
> If we don't use KSM and MIGRATION and it is compiled out,
> Can root's anon_vma disappear during rmap walking?
> who prevent it?
>
> What am I missing?

unlink_anon_vmas walks the list in the order from newest
to oldest, ie. the root always gets unlinked (and potentially
freed) last.

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