[RFC PATCH] mm: reduce noise in show_mem for lowmem allocations

[Michal Hocko]

Hi,
while discussing early DMA pool pre-allocation failure with Christoph
[1] I have realized that the allocation failure warning is rather noisy
for constrained allocations like GFP_DMA{32}. Those zones are usually
not populated on all nodes very often as their memory ranges are
constrained.

This is an attempt to reduce the ballast that doesn't provide any
relevant information for those allocation failures investigation.
Please note that I have only compile tested it (in my default config
setup) and I am throwing it mostly to see what people think about it.

[1] http://lkml.kernel.org/r/20220817060647.1032426-1-hch@xxxxxx
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