Messages in this thread | | | Date | Tue, 19 Feb 2002 00:03:33 +0000 (GMT) | From | Hugh Dickins <> | Subject | Re: [RFC] Page table sharing |
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On Tue, 19 Feb 2002, Daniel Phillips wrote: > On February 18, 2002 08:04 pm, Hugh Dickins wrote: > > On Mon, 18 Feb 2002, Daniel Phillips wrote: > > > On February 18, 2002 09:09 am, Hugh Dickins wrote: > > > > Since copy_page_range would not copy shared page tables, I'm wrong to > > > > point there. But __pte_alloc does copy shared page tables (to unshare > > > > them), and needs them to be stable while it does so: so locking against > > > > swap_out really is required. It also needs locking against read faults, > > > > and they against each other: but there I imagine it's just a matter of > > > > dropping the write arg to __pte_alloc, going back to pte_alloc again. > > I'm not sure what you mean here, you're not suggesting we should unshare the > page table on read fault are you?
I am. But I can understand that you'd prefer not to do it that way. Hugh
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