On Tue, 24 Apr 2018, Matthew Wilcox wrote: > From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> > > With larger memory sizes, it's more important to avoid external > fragmentation than reduce memory usage. If you do that then the higher order pages that we will then be using will be exhausted faster. I think we need a generic fix to be able to preserve higher order pages first. Dave Hansen and I thought about a 2M basepage configuration? Something between 4k and 2M would be better but then the hardware wont support that and given that we can have terabytes in a server this may be feasable now. Or make order 0 be 64k page like on ARM 64 and Power and then handle multiple ptes like the implementation years ago by Hugh.
