From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx132.postini.com [74.125.245.132]) by kanga.kvack.org (Postfix) with SMTP id BBCB06B00D1 for ; Wed, 22 May 2013 10:53:57 -0400 (EDT) Message-ID: <519CDC03.7070602@sr71.net> Date: Wed, 22 May 2013 07:53:55 -0700 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [PATCHv4 16/39] thp, mm: locking tail page is a bug References: <1368321816-17719-1-git-send-email-kirill.shutemov@linux.intel.com> <1368321816-17719-17-git-send-email-kirill.shutemov@linux.intel.com> <519BD69E.5000207@sr71.net> <20130522141245.F047CE0090@blue.fi.intel.com> In-Reply-To: <20130522141245.F047CE0090@blue.fi.intel.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Andrea Arcangeli , Andrew Morton , Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org 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" >>> >>> 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. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org