earlier allocation of order 0 pages in __alloc_pages

[Rohit Seth <rohit.seth@intel.com>]

I'm wondering if it is a good idea in __alloc_pages to first try to see
if a order 0 request can be serviced by cpu's pcp before checking the
low water marks for the zone.  The is useful if a request can be
serviced by a free page on the pcp then there is no reason to check the
zone's limits.  This early allocation should be without any replenishing
of pcps from zone free list

thanks,
-rohit

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