Re: [PATCH 02/11] mm,migration: Do not try to migrate unmapped anonymous pages

[KOSAKI Motohiro]

> > then, this logic depend on SLAB_DESTROY_BY_RCU, not refcount.
> > So, I think we don't need your [1/11] patch.
> > 
> > Am I missing something?
> > 
> 
> The refcount is still needed. The anon_vma might be valid, but the
> refcount is what ensures that the anon_vma is not freed and reused.

please please why do we need both mechanism. now cristoph is very busy and I am
de fact reviewer of page migration and mempolicy code. I really hope to understand
your patch.



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