Re: memcg: fix fatal livelock in kswapd

[Andrew Morton]

The trail seems to have cooled off here, but it's pretty urgent.

Having re-read the threads I find it notable that James hit a kswapd
softlockup with "non-PREEMPT CGROUP but disabled GROUP_MEM_RES_CTLR". 
This suggests that the problem isn't with memcg.  Or at least, we
should fix this kswapd lockup before worrying about memcg.

And I'm not sure that we should be assuming that there's something
wrong in shrink_slab().  We know that kswapd has gone berserk, and that
it will frequently call shrink_slab() when in that mode.  But this may
be because the top-level balance_pgdat() loop isn't terminating for
reasons unrelated to shrink_slab().

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