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SubjectRe: [PATCH] mm, memcg: Do not high throttle allocators based on wraparound
Michal Hocko writes:
>I find this paragraph rather confusing. This is essentially an unsigned
>underflow when any of the memcg up the hierarchy is below the high
>limit, right? There doesn't really seem anything complex in such a
>hierarchy.

The conditions to trigger the bug itself are easy, but having it obviously
visible in tests requires a moderately complex hierarchy, since in the basic
case ancestor_usage is "similar enough" to the test leaf cgroup's usage.

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