Re: [-mm][PATCH 8/10] fix shmem page migration incorrectness on memcgroup

[KOSAKI Motohiro]

> > mem_cgroup_uncharge() against old page is done after radix-tree-replacement.
> > And there were special handling to ingore swap-cache page. But, shmem can
> > be swap-cache and file-cache at the same time. Chekcing PageSwapCache() is
> > not correct here. Check PageAnon() instead.
> 
> When/How shmem can be both swap-cache and file-cache ?
> I can't understand that situation.

Hi

see, 

shmem_writepage()
   -> add_to_swap_cache()
      -> SetPageSwapCache()


BTW: his file-cache mean !Anon, not mean !SwapBacked.


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