From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zheng Liu Subject: Re: [PATCH v2 2/3] mm: Update file times when inodes are written after mmaped writes Date: Mon, 24 Dec 2012 16:36:37 +0800 Message-ID: <20121224083637.GA11906@gmail.com> References: <6b22b806806b21af02b70a2fa860a9d10304fc16.1356124965.git.luto@amacapital.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linux FS Devel , Dave Chinner , Jan Kara , Al Viro To: Andy Lutomirski Return-path: Content-Disposition: inline In-Reply-To: <6b22b806806b21af02b70a2fa860a9d10304fc16.1356124965.git.luto@amacapital.net> Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org On Fri, Dec 21, 2012 at 01:28:27PM -0800, Andy Lutomirski wrote: > The onus is currently on filesystems to call file_update_time > somewhere in the page_mkwrite path. This is unfortunate for three > reasons: > > 1. page_mkwrite on a locked page should be fast. ext4, for example, > often sleeps while dirtying inodes. (This could be considered a > fixable problem with ext4, but this approach makes it > irrelevant.) Hi Andy, Out of curiosity, could you please share more detailed information about how to reproduce and measure this problem in ext4? Thanks - Zheng -- 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