On Tue, Sep 27, 2016 at 09:54:12AM +0100, Mel Gorman wrote:

On Tue, Sep 27, 2016 at 09:30:55AM +0200, Peter Zijlstra wrote:
Simple is relative unless I drastically overcomplicated things and it
wouldn't be the first time. 64-bit only side-steps the page flag issue
as long as we can live with that.

So one problem with the 64bit only pageflags is that they do eat space
from page-flags-layout, we do try and fit a bunch of other crap in
there, and at some point that all will not fit anymore and we'll revert
to worse.

I've no idea how far away from that we are for distro kernels. I suppose
they have fairly large NR_NODES and NR_CPUS.

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