Nick Piggin [off-list ref] wrote:

 Ie, we have the (pages_low - pages_min) buffer after waking kswapd
 before entering synch reclaim. Previously there was no buffer. I thought
 this was the point of background reclaim. I don't know if I can explain
 it any better than that sorry.

Yes, that is the point.  I was wondering yesterday why pages_min was no
longer used for anything any more.  We must have screwed things up when
doing the lower zone protection stuff for NUMA.  Bugger.

Wanna send that patch again, with a fit-for-human-consumption
description?

Thanks.
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