linux-kernel - Re: [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge

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Date:	Mon, 31 Jan 2011 13:11:42 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: Re: [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2011-01-28 17:21:46]:

> On Fri, 28 Jan 2011 09:02:13 +0100
> Johannes Weiner <hannes@...xchg.org> wrote:
> 
> > On Fri, Jan 28, 2011 at 12:27:29PM +0900, KAMEZAWA Hiroyuki wrote:
> > > 
> > > Thanks to Johanns and Daisuke for suggestion.
> > > =
> > > Hugepage allocation shouldn't trigger oom.
> > > Allocation failure is not fatal.
> > > 
> > > Orignal-patch-by: Johannes Weiner <hannes@...xchg.org>
> > > Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> > > ---
> > >  mm/memcontrol.c |    4 +++-
> > >  1 file changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > Index: mmotm-0125/mm/memcontrol.c
> > > ===================================================================
> > > --- mmotm-0125.orig/mm/memcontrol.c
> > > +++ mmotm-0125/mm/memcontrol.c
> > > @@ -2369,11 +2369,14 @@ static int mem_cgroup_charge_common(stru
> > >  	struct page_cgroup *pc;
> > >  	int ret;
> > >  	int page_size = PAGE_SIZE;
> > > +	bool oom;
> > >  
> > >  	if (PageTransHuge(page)) {
> > >  		page_size <<= compound_order(page);
> > >  		VM_BUG_ON(!PageTransHuge(page));
> > > -	}
> > > +		oom = false;
> > > +	} else
> > > +		oom = true;
> > 
> > That needs a comment.  You can take the one from my patch if you like.
> > 
> 
> How about this ?
> ==
> Hugepage allocation shouldn't trigger oom.
> Allocation failure is not fatal.
>

 
Acked-by: Balbir Singh <balbir@...ux.vnet.ibm.com>
 
-- 
	Three Cheers,
	Balbir
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