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

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Message-Id: <20101119101427.45d78929.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 19 Nov 2010 10:14:27 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Arcangeli <aarcange@...hat.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 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.

Thanks,
-Kame

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