linux-kernel - Re: [PATCHv4 16/39] thp, mm: locking tail page is a bug

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Message-ID: <519CDC03.7070602@sr71.net>
Date:	Wed, 22 May 2013 07:53:55 -0700
From:	Dave Hansen <dave@...1.net>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Hugh Dickins <hughd@...gle.com>,
	Wu Fengguang <fengguang.wu@...el.com>, Jan Kara <jack@...e.cz>,
	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	Andi Kleen <ak@...ux.intel.com>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Hillf Danton <dhillf@...il.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv4 16/39] thp, mm: locking tail page is a bug

On 05/22/2013 07:12 AM, Kirill A. Shutemov wrote:
> Dave Hansen wrote:
>> On 05/11/2013 06:23 PM, Kirill A. Shutemov wrote:
>>> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>>>
>>> Locking head page means locking entire compound page.
>>> If we try to lock tail page, something went wrong.
>>
>> Have you actually triggered this in your development?
> 
> Yes, on early prototypes.

I'd mention this in the description, and think about how necessary this
is with your _current_ code.

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