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SubjectRe: [PATCH 01/11] mm,migration: Take a reference to the anon_vma before migrating
On Wed, Mar 17, 2010 at 11:38:54AM -0500, Christoph Lameter wrote:
> On Wed, 17 Mar 2010, Mel Gorman wrote:
>
> > This is true, but I don't think such a change belongs in this patch
> > series. If this series gets merged, then it would be sensible to investigate
> > if refcounting anon_vma is a good idea or would it be a bouncing write-shared
> > cacheline mess.
>
> SLAB_DESTROY_BY_RCU is there to avoid the cooling of hot cachelines by
> RCU.
>

Then even if we move to a full ref-count, it might still be a good idea
to preserve the SLAB_DESTROY_BY_RCU.

--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab


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