linux-kernel - Re: [PATCH 1/4] hugetlb, rmap: always use anon

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Date:	Fri, 10 Sep 2010 10:19:24 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andi Kleen <andi@...stfloor.org>, linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH 1/4] hugetlb, rmap: always use anon_vma root pointer

On Thu, Sep 9, 2010 at 9:23 PM, Naoya Horiguchi
<n-horiguchi@...jp.nec.com> wrote:
> This patch applies Andrea's fix given by the following patch into hugepage
> rmapping code:
>
>  commit 288468c334e98aacbb7e2fb8bde6bc1adcd55e05
>  Author: Andrea Arcangeli <aarcange@...hat.com>
>  Date:   Mon Aug 9 17:19:09 2010 -0700
>
> This patch uses anon_vma->root and avoids unnecessary overwriting when
> anon_vma is already set up.

Btw, why isn't the code in __page_set_anon_rmap() also doing this
cleaner version (ie a single "if (PageAnon(page)) return;" up front)?

The comments in that function are also some alien language translated
to english by some broken automatic translation service. Could
somebody clean up that function and come up with a comment that
actually parses as English and makes sense?

                                        Linus
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