Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH/RFC] Shared page tables | Date | Tue, 24 Jan 2006 01:39:46 +0100 |
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On Tuesday 24 January 2006 01:16, Ray Bryant wrote: > On Monday 23 January 2006 17:58, Ray Bryant wrote: > <snip> > > > ... And what kind of alignment constraints do we end up > > under in order to make the sharing happen? (My guess would be that there > > aren't any such constraints (well, page alignment.. :-) if we are just > > sharing pte's.) > > > > Oh, obviously that is not right as you have to share full pte pages. So on > x86_64 I'm guessing one needs 2MB alignment in order to get the sharing to > kick in, since a pte page maps 512 pages of 4 KB each.
The new randomized mmaps will likely actively sabotate such alignment. I just added them for x86-64.
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