Hi

quoted text
> In my understanding, 2 checks we have to do.
> 
> 1. When memcg finds PG_noreclaim page in its LRU, move it to noreclaim list of
>    memcg.
> 2. When PG_noreclaim page is moved back to generic LRU, memcg should move
>    it on its list. (we have to add a hook somewhere.)
> 
> But this may break current 'loose' synchronization between global LRU and
> memcg's LRU. When PG_noreclaim page is put back into active/inactive LRU ?
> 
> concerns are
> A. how to implement '2'

I tried to implement it today.
this patch is made against "[PATCH -mm 13/16] No Reclaim LRU Infrastructure"


quoted text
> B. race condtions.

don't worry :)
it isn't big problem.

global lru is reclaimbale and memcg lru is noreclaimable
	-> we can repair at move lru of shrink_[in]active_page().

global lru is noreclaimbale and memcg lru is reclaimable
	-> we can repair mem_cgroup_isolate_pages()