Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760244Ab3HNXie (ORCPT ); Wed, 14 Aug 2013 19:38:34 -0400 Received: from mail-vc0-f172.google.com ([209.85.220.172]:46639 "EHLO mail-vc0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758100Ab3HNXic (ORCPT ); Wed, 14 Aug 2013 19:38:32 -0400 MIME-Version: 1.0 In-Reply-To: <20130814230648.GD22316@thunk.org> References: <520BB9EF.5020308@linux.intel.com> <20130814194359.GA22316@thunk.org> <520BED7A.4000903@intel.com> <20130814230648.GD22316@thunk.org> From: Andy Lutomirski Date: Wed, 14 Aug 2013 16:38:12 -0700 Message-ID: Subject: Re: page fault scalability (ext3, ext4, xfs) To: "Theodore Ts'o" , Dave Hansen , Dave Hansen , linux-fsdevel@vger.kernel.org, xfs@oss.sgi.com, linux-ext4@vger.kernel.org, Jan Kara , LKML , david@fromorbit.com, Tim Chen , Andi Kleen , Andy Lutomirski Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 697 Lines: 18 On Wed, Aug 14, 2013 at 4:06 PM, Theodore Ts'o wrote: > On Wed, Aug 14, 2013 at 01:50:02PM -0700, Dave Hansen wrote: >> >> Would a plain old fallocate() do the trick, or does it actually need >> zeros written to it? > > It would be better to write zeros to it, so we aren't measuring the > cost of the unwritten->written conversion. At the risk of beating a dead horse, how hard would it be to defer this part until writeback? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/