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From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
To: "linux-mm@kvack.org" <linux-mm@kvack.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	npiggin@suse.de, hugh.dickins@tiscali.co.uk,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	torvalds@linux-foundation.org
Subject: [PATCH] ZERO_PAGE again v5.
Date: Wed, 5 Aug 2009 19:16:43 +0900	[thread overview]
Message-ID: <20090805191643.2b11ae78.kamezawa.hiroyu@jp.fujitsu.com> (raw)


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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             reply	other threads:[~2009-08-05 10:18 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-05 10:16 KAMEZAWA Hiroyuki [this message]
2009-08-05 10:17 ` [PATCH 1/2] ZERO_PAGE config KAMEZAWA Hiroyuki
2009-08-05 10:19 ` [PATCH 2/2] ZERO_PAGE based on pte_special KAMEZAWA Hiroyuki
2009-08-09 17:28 ` [PATCH] ZERO_PAGE again v5 Hugh Dickins
2009-08-10  0:14   ` KAMEZAWA Hiroyuki
2009-08-10 11:24     ` Hugh Dickins

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