[RFC][PATCH] memcg: softlimit (Another one) v3

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

Still RFC but maybe much better than v2.
(Reduced CC:s)

This patch implemetns softlimit for memcg.
Totally re-designed from v2.

[1/4] patch for softlimit_in_bytes.
[2/4] patch for softlimit_priority and victim scheduler.
[3/4] hooks to kswapd
[4/4] Documentation

Softlimit works when kswapd() runs and select victim cgroup to be reclaimed.

Details of calculation of parameters are not fixed yet but this version will
not be very bad. This patch uses static-priority-round-robin scheduling.
If you have better idea for implemnting dynamic-priority one, it's welcome.

I consider following usage in this patch.

Assume  softlimit supports priority 0...8 (0 is the lowest, 8 is the highest)
Example)
   /group_A/      softlimit=1G, priority=8
           /01    priority=0
           /02    prinrity=1

kswapd() will reclaim memory from 01->02->group_A if cgroup contains memory
in zone.

Thanks,
-Kame


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