Re: [PATCH 8/9] mm: implement split page table lock for PMD level

[Peter Zijlstra]

On Fri, Sep 13, 2013 at 04:06:15PM +0300, Kirill A. Shutemov wrote:
> The basic idea is the same as with PTE level: the lock is embedded into
> struct page of table's page.
> 
> Split pmd page table lock only makes sense on big machines.
> Let's say >= 32 CPUs for now.

Why is this? Couldn't I generate the same amount of contention on PMD
level as I can on PTE level in the THP case?


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