Re: [RFC PATCH 2/2] mm/vmscan.c: Prevent allocating shrinker_info on offlined nodes

[David Hildenbrand]

> This doesn't seen complete. Slab shrinkers are used in the reclaim
> context. Previously offline nodes could be onlined later and this would
> lead to NULL ptr because there is no hook to allocate new shrinker
> infos. This would be also really impractical because this would have to
> update all existing memcgs...

Instead of going through the trouble of updating...

...  maybe just keep for_each_node() and check if the target node is
offline. If it's offline, just allocate from the first online node.
After all, we're not using __GFP_THISNODE, so there are no guarantees
either way ...

-- 
Thanks,

David / dhildenb