| From: |
| KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> |
| To: |
| "linux-mm@kvack.org" <linux-mm@kvack.org> |
| Subject: |
| [PATCH] ZERO_PAGE again v5. |
| Date: |
| Wed, 5 Aug 2009 19:16:43 +0900 |
| Message-ID: |
| <20090805191643.2b11ae78.kamezawa.hiroyu@jp.fujitsu.com> |
| 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 |
| Archive‑link: | |
Article |
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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