linux-kernel - Re: [PATCH 3/3] mm: call vma_adjust_trans

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Message-ID: <20140227225600.GA8034@node.dhcp.inet.fi>
Date:	Fri, 28 Feb 2014 00:56:00 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mm: call vma_adjust_trans_huge() only for
 thp-enabled vma

On Wed, Feb 26, 2014 at 11:39:37PM -0500, Naoya Horiguchi wrote:
> vma_adjust() is called also for vma(VM_HUGETLB) and it could happen that
> we happen to try to split hugetlbfs hugepage. So exclude the possibility.

NAK.

It can't happen: vma_adjust_trans_huge checks for vma->vm_ops and hugetlb
VMA always have it set unlike THP.

-- 
 Kirill A. Shutemov
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