Re: [PATCH RFC] mm/memcontrol: reclaim severe usage over high limit in get_user_pages loop

[Konstantin Khlebnikov]

On 8/6/19 10:07 AM, Michal Hocko wrote:
> On Fri 02-08-19 13:44:38, Michal Hocko wrote:
> [...]
> > > > diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> > > > index ba9138a4a1de..53a35c526e43 100644
> > > > --- a/mm/memcontrol.c
> > > > +++ b/mm/memcontrol.c
> > > > @@ -2429,8 +2429,12 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask,
> > > >    				schedule_work(&memcg->high_work);
> > > >    				break;
> > > >    			}
> > > > -			current->memcg_nr_pages_over_high += batch;
> > > > -			set_notify_resume(current);
> > > > +			if (gfpflags_allow_blocking(gfp_mask)) {
> > > > +				reclaim_high(memcg, nr_pages, GFP_KERNEL);
> >
> > ups, this should be s@GFP_KERNEL@gfp_mask@
> >
> > > > +			} else {
> > > > +				current->memcg_nr_pages_over_high += batch;
> > > > +				set_notify_resume(current);
> > > > +			}
> > > >    			break;
> > > >    		}
> > > >    	} while ((memcg = parent_mem_cgroup(memcg)));
>
> Should I send an official patch for this?

I prefer to keep it as is while we have no better solution.