Nick Piggin [off-list ref] wrote:

Previously the ->protection[] logic was broken. It was difficult to follow
 and basically didn't use the asynch reclaim watermarks properly.

eh?

Broken how?

What is an "asynch reclaim watermark"?

 This one uses ->protection only for lower-zone protection, and gives the
 allocator flexibility to add the watermarks as desired.

eh?
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