[RFC 0/9] Reclaim during GFP_ATOMIC allocs

[Christoph Lameter]

This is the extended version of the reclaim patchset. It enables reclaim from
clean file backed pages during GFP_ATOMIC allocs. A bit invasive since
may locks must now be taken with saving flags. But it works.

Tested by repeatedly allocating 12MB of memory from the timer interrupt.

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