Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753878Ab3DNTbZ (ORCPT ); Sun, 14 Apr 2013 15:31:25 -0400 Received: from mail-la0-f41.google.com ([209.85.215.41]:39291 "EHLO mail-la0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753106Ab3DNTbX (ORCPT ); Sun, 14 Apr 2013 15:31:23 -0400 From: Dmitry Monakhov To: ext4 development , LKML Subject: [PATCH 0/2] [RFC] blkdev: flush generation optimization User-Agent: Notmuch/0.6.1 (http://notmuchmail.org) Emacs/23.3.1 (x86_64-redhat-linux-gnu) CC: Jan Kara , axboe@kernel.dk Date: Sun, 14 Apr 2013 23:31:17 +0400 Message-ID: <87wqs4kiyi.fsf@openvz.org> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 16196 Lines: 259 --=-=-= Some filesystems try to optimize barrier flushes by maintaining fs-specific generation counters, but if we introduce generic flush generation counter for block device filesystems may use it for fdatasync(2) optimization. Optimization should works if userspace performs mutli-threaded IO with a lot of fdatasync() Here are graphs for a test where each task performs random buffered writes to dedicated file and performs fdatasync(2) after each operation. 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