linux-kernel - Re: Free memory never fully used, swapping

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Message-Id: <20101126093326.B6D0.A69D9226@jp.fujitsu.com>
Date:	Fri, 26 Nov 2010 09:33:49 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Simon Kirby <sim@...tway.ca>
Cc:	kosaki.motohiro@...fujitsu.com, Shaohua Li <shaohua.li@...el.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: Free memory never fully used, swapping

> On Thu, Nov 25, 2010 at 07:18:49PM +0900, KOSAKI Motohiro wrote:
> 
> > This?
> 
> > -	alloc_gfp = (flags | __GFP_NOWARN | __GFP_NORETRY) & ~__GFP_NOFAIL;
> > +	alloc_gfp = (flags | __GFP_NOWARN) & ~(__GFP_NOFAIL | __GFP_WAIT);
> 
> kswapd still gets woken in the !__GFP_WAIT case, which is what I was
> seeing anyway, because the order-3 allocatons were starting from
> __alloc_skb().

Oops, my fault.
We also need __GFP_NOKSWAPD. (Proposed by Andrea)


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