On Tue, Jul 15, 2014 at 02:43:58PM -0400, Naoya Horiguchi wrote:
> On Tue, Jul 15, 2014 at 01:34:39PM -0400, Johannes Weiner wrote:
> > On Tue, Jul 15, 2014 at 06:07:35PM +0200, Michal Hocko wrote:
> > > 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
> > > http://marc.info/?l=linux-mm&m=140475936311294&w=2
> > >
> > > I didn't get to review this one but the easiest fix seems to be check
> > > HugePage and do not call uncharge.
> >
> > Yes, that makes sense. I'm also moving the uncharge call into
> > __put_single_page() and __put_compound_page() so that PageHuge(), a
> > function call, only needs to be checked for compound pages.
> >
> > > > 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?
> >
> > Memcg pages that *do* need uncharging might not necessarily be on the
> > LRU list.
>
> OK.
>
> > Does the following work for you?
>
> Unfortunately, with this change I saw the following bug message when
> stressing with hugepage migration.
> move_to_new_page() is called by unmap_and_move_huge_page() too, so
> we need some hugetlb related code around mem_cgroup_migrate().
Can we just move hugetlb_cgroup_migrate() into move_to_new_page()? It
doesn't seem to be dependent of any page-specific state.
diff --git a/mm/migrate.c b/mm/migrate.c
index 7f5a42403fae..219da52d2f43 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -781,7 +781,10 @@ static int move_to_new_page(struct page *newpage, struct
page *page,
if (!PageAnon(newpage))
newpage->mapping = NULL;
} else {
- mem_cgroup_migrate(page, newpage, false);
+ if (PageHuge(page))
+ hugetlb_cgroup_migrate(hpage, new_hpage);
+ else
+ mem_cgroup_migrate(page, newpage, false);
if (remap_swapcache)
remove_migration_ptes(page, newpage);
if (!PageAnon(page))
@@ -1064,9 +1067,6 @@ static int unmap_and_move_huge_page(new_page_t
get_new_page,
if (anon_vma)
put_anon_vma(anon_vma);
- if (rc == MIGRATEPAGE_SUCCESS)
- hugetlb_cgroup_migrate(hpage, new_hpage);
-
unlock_page(hpage);
out:
if (rc != -EAGAIN)
--
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