linux-kernel - Re: [patch 7/8] vmscan: memcg-aware unevictable page rescue scanner

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Date:	Wed, 20 Jul 2011 02:36:53 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Ying Han <yinghan@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Michal Hocko <mhocko@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 7/8] vmscan: memcg-aware unevictable page rescue scanner

On Tue, Jul 19, 2011 at 03:47:43PM -0700, Ying Han wrote:
> On Tue, May 31, 2011 at 11:25 PM, Johannes Weiner <hannes@...xchg.org>wrote:
> 
> > Once the per-memcg lru lists are exclusive, the unevictable page
> > rescue scanner can no longer work on the global zone lru lists.
> >
> > This converts it to go through all memcgs and scan their respective
> > unevictable lists instead.
> >
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> > ---
> >  include/linux/memcontrol.h |    2 +
> >  mm/memcontrol.c            |   11 +++++++++
> >  mm/vmscan.c                |   53
> > +++++++++++++++++++++++++++----------------
> >  3 files changed, 46 insertions(+), 20 deletions(-)
> >
> > diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> > index cb02c00..56c1def 100644
> > --- a/include/linux/memcontrol.h
> > +++ b/include/linux/memcontrol.h
> > @@ -60,6 +60,8 @@ extern void mem_cgroup_cancel_charge_swapin(struct
> > mem_cgroup *ptr);
> >
> >  extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct
> > *mm,
> >                                        gfp_t gfp_mask);
> > +struct page *mem_cgroup_lru_to_page(struct zone *, struct mem_cgroup *,
> > +                                   enum lru_list);
> >
> 
> Did we miss a #ifdef case for this function? I got compile error by
> disabling memcg.

I assume it's because the call to it is not optimized away properly in
the disabled case.  I'll have it fixed in the next round, thanks for
letting me know.
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