On Mon, Aug 31, 2015 at 05:30:08PM +0300, Vladimir Davydov wrote:

slab/slub can issue alloc_pages() any time with any flags they want and
it won't be accounted to memcg, because kmem is accounted at slab/slub
layer, not in buddy.

Hmmm?  I meant the eventual calling into try_charge w/ GFP_NOWAIT.
Speculative usage of GFP_NOWAIT is bound to increase and we don't want
to put on extra restrictions from memcg side.  For memory.high,
punting to the return path is a pretty stright-forward solution which
should make the problem go away almost entirely.

Thanks.

-- 
tejun

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