linux-kernel - [PATCH 0/2] ZERO PAGE again v3.

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Message-Id: <20090709122428.8c2d4232.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 9 Jul 2009 12:24:28 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	linux-mm@...ck.org
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	npiggin@...e.de,
	"hugh.dickins@...cali.co.uk" <hugh.dickins@...cali.co.uk>,
	avi@...hat.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org, aarcange@...hat.com
Subject: [PATCH 0/2] ZERO PAGE again v3.

After v2 discussion, I felt that "Go" sign can be given if implemetaion is neat
and tiny and overhead seems very small. Here is v3.

In this version,

 - use pte_special() in vm_normal_page()
   All ZERO_PAGE check will go down to vm_normal_page() and check is done here.
   Some new flags in follow_page() and get_user_pages().

 - per arch use-zero-page config is added.
   IIUC, archs which have _PAGE_SPECIAL is only x86, powerpc, s390.
   Because this patch make use of pte_special() check, config to use zero page
   is added and you can turn it off if necessary.
   I this patch, only x86 is turned on which I can test.

Any comments are welcome. 

Thanks,
-Kame

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