[RFC][PATCH 0/8] mm: freshen percpu pageset code

[Dave Hansen]

The percpu pageset (pcp) code is looking a little old and
neglected these days.  This set does a couple of these things (in
order of importance, not order of implementation in the series):

1. Change the default pageset pcp->high value from 744kB
   to 512k.  (see "consolidate high-to-batch ratio code")
2. Allow setting of vm.percpu_pagelist_fraction=0, which
   takes you back to the boot-time behavior
3. Resolve inconsistencies in the way the boot-time and
   sysctl pcp code works.
4. Clarify some function names and code comments.

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