Messages in this thread | | | Date | Tue, 13 Mar 2007 14:36:11 -0700 | From | Jeremy Fitzhardinge <> | Subject | Re: [QUICKLIST 0/4] Arch independent quicklists V2 |
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Matt Mackall wrote: > Well you -could- do this: > > - reuse a long in struct page as a used map that divides the page up > into 32 or 64 segments > - every time you set a PTE, set the corresponding bit in the mask > - when we zap, only visit the regions set in the mask > > Thus, you avoid visiting most of a PMD page in the sparse case, > assuming PTEs aren't evenly spread across the PMD. > > This might not even be too horrible as the appropriate struct page > should be in cache with the appropriate bits of the mm already locked, > etc. >
And do the same in pte pages for actual mapped pages? Or do you think they would be too densely populated for it to be worthwhile?
J
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