linux-kernel - Re: [PATCH 38 of 66] memcontrol: try charging huge pages from stock

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Message-ID: <20101214173821.GI5638@random.random>
Date:	Tue, 14 Dec 2010 18:38:21 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	linux-mm@...ck.org, Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Chris Wright <chrisw@...s-sol.org>, bpicco@...hat.com,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Chris Mason <chris.mason@...cle.com>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 38 of 66] memcontrol: try charging huge pages from stock

On Fri, Nov 19, 2010 at 10:14:27AM +0900, KAMEZAWA Hiroyuki wrote:
> On Wed, 03 Nov 2010 16:28:13 +0100
> Andrea Arcangeli <aarcange@...hat.com> wrote:
> 
> > From: Johannes Weiner <hannes@...xchg.org>
> > 
> > The stock unit is just bytes, there is no reason to only take normal
> > pages from it.
> > 
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> 
> nonsense. The stock size is CHARGE_SIZE=32*PAGE_SIZE at maximum.
> When we make this to be larger than HUGEPAGE size, 2M per cpu at least.
> This means memcg's resource "usage" accounting will have 128MB inaccuracy.
> 
> Nack.

Removed, thanks!
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