linux-kernel - Re: [PATCHv2 19/28] thp: run vma_adjust_trans_huge() outside i_mmap

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Date:	Tue, 16 Feb 2016 07:49:11 -0800
From:	Dave Hansen <dave.hansen@...el.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Vlastimil Babka <vbabka@...e.cz>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Jerome Marchand <jmarchan@...hat.com>,
	Yang Shi <yang.shi@...aro.org>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv2 19/28] thp: run vma_adjust_trans_huge() outside
 i_mmap_rwsem

On 02/11/2016 06:21 AM, Kirill A. Shutemov wrote:
> vma_addjust_trans_huge() splits pmd if it's crossing VMA boundary.
> During split we munlock the huge page which requires rmap walk.
> rmap wants to take the lock on its own.

Ahhh, ... so we $SUBJECT in order to fix it.

Now it all makes sense.  Maybe I'm old fashioned, but I tend to have
forgotten $SUBJECT by the time I start to read the patch body text.
It's really handy for me when the body text stands on its own.