From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 1A7FA6B0253 for ; Thu, 26 Jan 2017 10:44:49 -0500 (EST) Received: by mail-pf0-f197.google.com with SMTP id d123so62108013pfd.0 for ; Thu, 26 Jan 2017 07:44:49 -0800 (PST) Received: from bombadil.infradead.org (bombadil.infradead.org. [65.50.211.133]) by mx.google.com with ESMTPS id e6si1724275pln.22.2017.01.26.07.44.48 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 26 Jan 2017 07:44:48 -0800 (PST) Date: Thu, 26 Jan 2017 07:44:39 -0800 From: Matthew Wilcox Subject: Re: [PATCHv6 06/37] thp: handle write-protection faults for file THP Message-ID: <20170126154439.GB20495@bombadil.infradead.org> References: <20170126115819.58875-1-kirill.shutemov@linux.intel.com> <20170126115819.58875-7-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20170126115819.58875-7-kirill.shutemov@linux.intel.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Theodore Ts'o , Andreas Dilger , Jan Kara , Andrew Morton , Alexander Viro , Hugh Dickins , Andrea Arcangeli , Dave Hansen , Vlastimil Babka , Ross Zwisler , linux-ext4@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-block@vger.kernel.org On Thu, Jan 26, 2017 at 02:57:48PM +0300, Kirill A. Shutemov wrote: > For filesystems that wants to be write-notified (has mkwrite), we will > encount write-protection faults for huge PMDs in shared mappings. > > The easiest way to handle them is to clear the PMD and let it refault as > wriable. ... of course, the filesystem could implement ->pmd_fault, and then it wouldn't hit this case ... -- 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