Re: [RFC] mm: bail out in shrin_inactive_list

[Minchan Kim <minchan@kernel.org>]

On Tue, Jul 26, 2016 at 08:46:50AM +0100, Mel Gorman wrote:
> On Tue, Jul 26, 2016 at 10:21:57AM +0900, Minchan Kim wrote:
> > > > I believe proper fix is to modify get_scan_count. IOW, I think
> > > > we should introduce lruvec_reclaimable_lru_size with proper
> > > > classzone_idx but I don't know how we can fix it with memcg
> > > > which doesn't have zone stat now. should introduce zone stat
> > > > back to memcg? Or, it's okay to ignore memcg?
> > > > 
> > > 
> > > I think it's ok to ignore memcg in this case as a memcg shrink is often
> > > going to be for pages that can use highmem anyway.
> > 
> > So, you mean it's okay to ignore kmemcg case?
> > If memcg guys agree it, I want to make get_scan_count consider
> > reclaimable lru size under the reclaim constraint, instead.
> > 
> 
> For now, I believe yet. My understanding is that the primary use cases
> for kmemcg is systems running large numbers of containers. It consider
> it extremely unlikely that large 32-bit systems are being used for large
> numbers of containers and require usage of kmemcg.

Okay, Then how about this?
I didn't test it but I guess it should work.