Hi, Yamamoto-san.

I'm reviewing and testing your patch now.

I think your implementation is better because:
- the group to be charged is determined correctly
  at the point of swapout, without fixing the behavior
  of move_task of memcg.
  (I think the behavior of move_task of memcg should be
  fixed anyway.)
- the group to be uncharged is remembered in page struct
  of pmd, so there is no need to add array of pointers
  to swap_info_struct.

> - anonymous objects (shmem) are not accounted.
IMHO, shmem should be accounted.
I agree it's difficult in your implementation,
but are you going to support it?


Thanks,
Daisuke Nishimura.
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