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

[Kirill A. Shutemov]

Peter Zijlstra wrote:
> 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?

Hm. You are right. You just need more memory for that.
Do you want it to be "4" too?

-- 
 Kirill A. Shutemov
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