linux-kernel - [PATCH] ZERO

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Message-Id: <20090805191643.2b11ae78.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 5 Aug 2009 19:16:43 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"linux-mm@...ck.org" <linux-mm@...ck.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	npiggin@...e.de, hugh.dickins@...cali.co.uk,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	torvalds@...ux-foundation.org
Subject: [PATCH] ZERO_PAGE again v5.


Updated from v4 as
  - avoid to add new arguments to vm_normal_page().
    vm_normal_page() always returns NULL if ZERO_PAGE is found.
  - follow_page() directly handles pte_special and ANON_ZERO_PAGE.

Then, amount of changes are reduced. Thanks for advices.

Concerns pointed out:
  - Does use_zero_page() cover all cases ?
    I think yes..
  - All get_user_pages() callers, which may find ZERO_PAGE is safe ?
    need tests.
  - All follow_pages() callers, which may find ZERO_PAGE is safe ?
    I think yes.

Thanks,
-Kame

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