Nick Piggin [off-list ref] wrote:

You would
expect ZONE_NORMAL to have more pages reclaimed from it
because there should be more pressure on it.

Why?

The only things which should be special about ZONE_NORMAL which I can think
of are:

a) All the early-allocated pinned memory is sitting there and

b) If you start an app which uses a lot of memory, its text pages will
   probabyl be in ZONE_NORMAL while ZONE_DMA will contain just bss and
   pagecache.

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