Re: [patch 13/13] mm: memcontrol: rewrite uncharge API
From: Michal Hocko
Date: Tue Jul 15 2014 - 12:07:46 EST
On Tue 15-07-14 11:55:37, Naoya Horiguchi wrote:
> On Wed, Jun 18, 2014 at 04:40:45PM -0400, Johannes Weiner wrote:
> > diff --git a/mm/swap.c b/mm/swap.c
> > index a98f48626359..3074210f245d 100644
> > --- a/mm/swap.c
> > +++ b/mm/swap.c
> > @@ -62,6 +62,7 @@ static void __page_cache_release(struct page *page)
> > del_page_from_lru_list(page, lruvec, page_off_lru(page));
> > spin_unlock_irqrestore(&zone->lru_lock, flags);
> > }
> > + mem_cgroup_uncharge(page);
> > }
> > static void __put_single_page(struct page *page)
> This seems to cause a list breakage in hstate->hugepage_activelist
> when freeing a hugetlbfs page.
This looks like a fall out from
I didn't get to review this one but the easiest fix seems to be check
HugePage and do not call uncharge.
> For hugetlbfs, we uncharge in free_huge_page() which is called after
> __page_cache_release(), so I think that we don't have to uncharge here.
> In my testing, moving mem_cgroup_uncharge() inside if (PageLRU) block
> fixed the problem, so if that works for you, could you fold the change
> into your patch?
> Naoya Horiguchi
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