Re: [00/41] Large Blocksize Support V7 (adds memmap support)

[Christoph Lameter]

On Sun, 16 Sep 2007, Jörn Engel wrote:

> I bet!  My (false) assumption was the same as Goswin's.  If non-movable
> pages are clearly seperated from movable ones and will evict movable
> ones before polluting further mixed superpages, Nick's scenario would be
> nearly infinitely impossible.
> 
> Assumption doesn't reflect current code.  Enforcing this assumption
> would cost extra overhead.  The amount of effort to make Christoph's
> approach work reliably seems substantial and I have no idea whether it
> would be worth it.

My approach is based on Mel's code and is already working the way you 
describe. Page cache allocs are marked __GFP_MOVABLE by Mel's work.