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

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Message-Id: <20110128143912.66f60a22.nishimura@mxp.nes.nec.co.jp>
Date:	Fri, 28 Jan 2011 14:39:12 +0900
From:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
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>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>
Subject: Re: [BUGFIX][PATCH 3/4] mecg: fix oom flag at THP charge

On Fri, 28 Jan 2011 12:27:29 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> 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>

IIUC, this patch isn't necessary because we don't go into oom
in "page_size > PAGE_SIZE" case after [2/4].
But I think it's not so bad to show explicitly that we don't cause oom in
THP charge.

Acked-by: Daisuke Nishimura <nishimura@....nes.nec.co.jp>

Thanks,
Daisuke Nishimura.
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