Messages in this thread | | | From | "Kirill A. Shutemov" <> | Subject | Re: [PATCH 8/9] mm: implement split page table lock for PMD level | Date | Fri, 13 Sep 2013 17:25:13 +0300 (EEST) |
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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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