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

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Message-ID: <20110128080213.GC2213@cmpxchg.org>
Date:	Fri, 28 Jan 2011 09:02:13 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"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>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge

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.
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