Messages in this thread | | | Date | Tue, 15 Jul 2014 16:59:34 -0700 | From | "H. Peter Anvin" <> | Subject | Re: [RFC PATCH 3/11] x86, mm, pat: Change reserve_memtype() to handle WT type |
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On 07/15/2014 04:54 PM, Andy Lutomirski wrote: > > From vague memory, the current mechanism for tracking RAM memtypes (as > opposed to memtypes for everything that isn't RAM) is limited to a > very small number of types, leading to oddities like not being able to > create WT ram with this patchset. > > Using the pagetables directly would be simpler (no extra data > structure) and would automatically exactly track the set of memtypes > that can fit in the pagetable structures. >
I don't think there is anything fundamental, though. The number of types had more to do with what there was demand for. I will look into it.
-hpa
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