From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S269352AbUIIFzo (ORCPT ); Thu, 9 Sep 2004 01:55:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S269353AbUIIFzo (ORCPT ); Thu, 9 Sep 2004 01:55:44 -0400 Received: from fgwmail5.fujitsu.co.jp ([192.51.44.35]:55235 "EHLO fgwmail5.fujitsu.co.jp") by vger.kernel.org with ESMTP id S269352AbUIIFzW (ORCPT ); Thu, 9 Sep 2004 01:55:22 -0400 Date: Thu, 09 Sep 2004 15:00:35 +0900 From: Hiroyuki KAMEZAWA Subject: Re: [RFC][PATCH] no bitmap buddy allocator : removing atomic ops (4/4) In-reply-to: <413EF64B.2060407@jp.fujitsu.com> To: Hiroyuki KAMEZAWA Cc: Linux Kernel ML , linux-mm , LHMS , Andrew Morton , William Lee Irwin III , Dave Hansen , Hirokazu Takahashi Message-id: <413FF183.2010207@jp.fujitsu.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii; format=flowed Content-transfer-encoding: 7bit X-Accept-Language: en-us, en User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.6) Gecko/20040113 References: <413EF64B.2060407@jp.fujitsu.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hiroyuki KAMEZAWA wrote: > To check effects of this patch. I made a tiny test. > > ************** test-program ******************** > for(i = 0; i < 1000; i++) { > mmap(16 Mega bytes, MAP_ANON); > touch all pages; > munmap(16 Mega bytes); > } > ************************************************ These are results when CONFIG_SMP=n reference kernel- 2.6.9-rc1-mm4 Total 0:31.51 System 29.53 User 1.92 Total 0:31.76 System 29.82 User 1.89 Total 0:31.76 System 29.81 User 1.89 Total 0:31.84 System 29.79 User 2.00 Total 0:32.05 System 30.01 User 1.99 no bitmap witout optimization Total 0:31.17 System 29.18 User 1.93 Total 0:31.30 System 29.28 User 1.97 Total 0:31.39 System 29.36 User 1.97 Total 0:31.46 System 29.40 User 2.02 Total 0:31.51 System 29.45 User 2.00 no bitmap with optimization Total 0:31.17 System 29.10 User 2.01 Total 0:31.28 System 29.32 User 1.91 Total 0:31.35 System 29.29 User 2.01 Total 0:31.47 System 29.43 User 1.98 Total 0:31.50 System 29.52 User 1.93 There is no difference between optimized and not-optimized version. -- Kame > Results of this program. > Host : Intex Xeon 1.8GHz x2, Memory 8Gbytes. Multi-user mode. > > Reference Kernel --- linux-2.6.9-rc1-mm4 > Total 0:35.79 System 33.89 User 1.88 > Total 0:35.44 System 33.58 User 1.85 > Total 0:35.75 System 33.81 User 1.91 > Total 0:35.89 System 34.03 User 1.82 > Total 0:35.93 System 34.03 User 1.84 > > No-bitmap without this micro-optimization patch > Total 0:37.58 System 35.69 User 1.89 > Total 0:37.52 System 35.66 User 1.86 > Total 0:37.56 System 35.68 User 1.88 > Total 0:37.64 System 35.76 User 1.88 > Total 0:37.72 System 35.89 User 1.82 > > No-bitmap with this micro-optimization patch. > Total 0:35.28 System 33.45 User 1.81 > Total 0:35.38 System 33.62 User 1.75 > Total 0:35.44 System 33.58 User 1.84 > Total 0:35.52 System 33.58 User 1.90 > Total 0:35.79 System 33.92 User 1.81 > > Single-user-mode. > > reference-kernel linux-2.6.9-rc1-mm4: > Total 0:35.20 System 33.32 User 1.88 > Total 0:35.23 System 33.37 User 1.85 > Total 0:35.58 System 33.77 User 1.81 > Total 0:35.49 System 33.60 User 1.90 > Total 0:35.79 System 33.80 User 1.99 > > No-bitmap without this micro-optimization patch > Total 0:36.83 System 35.16 User 1.67 > Total 0:36.45 System 34.66 User 1.79 > Total 0:36.81 System 35.10 User 1.70 > Total 0:36.89 System 35.24 User 1.65 > Total 0:36.82 System 35.14 User 1.68 > > No-bitmap with this micor-optimization patch: > Total 0:34.97 System 33.07 User 1.89 > Total 0:34.94 System 32.98 User 1.95 > Total 0:34.99 System 33.11 User 1.87 > Total 0:34.90 System 33.14 User 1.76 > Total 0:34.92 System 33.02 User 1.90 > > > Results with this patch is better than ones without this by 2 seconds. > 2/1000 = 2ms per 1 iteration (for 16 Megabytes alloc/free). >