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SubjectRe: [RFC][PATCH 5/5] memcg: drain per cpu stock
Balbir Singh さんは書きました:
> * KAMEZAWA Hiroyuki <> [2009-08-28
> 13:28:09]:
>> Add function for dropping per-cpu stock of charges.
>> This is called when
>> - cpu is unplugged.
>> - force_empty
>> - recalim seems to be not easy.
>> Signed-off-by: KAMEZAWA Hiroyuki <>
> The complexity of this patch and additional code make percpu_counter
> more attractive. Why not work on percpu_counter if that is not as good
> as we expect it to be and in turn help other exploiters as well.

- percpu counter is slow.
- percpu counter is "counter". we use res_counter not as counter but as
accounting for "limit". This "borrow" charges is core of this patch.
- Adding "flush" ops for percpu counter will be much more mess.
- This implementation handles mem->res and mem->memsw at the same time.
This reduces much overhead.


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