From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751875AbaL2C2S (ORCPT ); Sun, 28 Dec 2014 21:28:18 -0500 Received: from mga11.intel.com ([192.55.52.93]:37038 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751534AbaL2C2R (ORCPT ); Sun, 28 Dec 2014 21:28:17 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,862,1389772800"; d="scan'208";a="434427818" Message-ID: <1419820095.26403.77.camel@intel.com> Subject: Re: [LKP] [ftrace] fef5aeeee9e: -27.2% boot-slabinfo.num_objs From: Huang Ying To: Steven Rostedt Cc: LKML , LKP ML Date: Mon, 29 Dec 2014 10:28:15 +0800 In-Reply-To: <20141223083214.0b199465@gandalf.local.home> References: <1419304217.26403.44.camel@intel.com> <20141223083214.0b199465@gandalf.local.home> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.9-1 Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2014-12-23 at 08:32 -0500, Steven Rostedt wrote: > On Tue, 23 Dec 2014 11:10:17 +0800 > Huang Ying wrote: > > > FYI, we noticed the below changes on > > > > commit fef5aeeee9e3717e7aea991a7ae9ff6a7a2d4c85 ("ftrace: Replace tramp_hash with old_*_hash to save space") > > > > > > testbox/testcase/testparams: vm-kbuild-4G/boot/1 > > > > e1effa0144a1ddf5 fef5aeeee9e3717e7aea991a7a > > ---------------- -------------------------- > > %stddev %change %stddev > > \ | \ > > 437752 ± 0% -27.2% 318545 ± 0% boot-slabinfo.num_objs > > > > vm-kbuild-4G: qemu-system-x86_64 -enable-kvm > > Memory: 4G > > I have no idea what this test does. Is this good or bad? Is that -27.2% > a performance regression, or memory regression? IMO, it is good. Memory usage is reduced. Best Regards, Huang, Ying > -- Steve > > > > > > > > > > boot-slabinfo.num_objs > > > > 440000 *+*--*-*-*------*----*-*-*--*--------*-*--*-*-*--*-----------------+ > > | *.* *. *.*..* | > > 420000 ++ | > > | | > > 400000 ++ | > > | | > > 380000 ++ | > > | | > > 360000 ++ | > > | | > > 340000 ++ | > > | | > > 320000 O+O O O O O O O O O O O O O O O O O O O O O O O O O O > > | O O O | > > 300000 ++-----------------------------------------------------------------+ > > > > [*] bisect-good sample > > [O] bisect-bad sample > > > > To reproduce: > > > > apt-get install ruby ruby-oj > > git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git > > cd lkp-tests > > bin/setup-local job.yaml # the job file attached in this email > > bin/run-local job.yaml > > > > > > Disclaimer: > > Results have been estimated based on internal Intel analysis and are provided > > for informational purposes only. Any difference in system hardware or software > > design or configuration may affect actual performance. > > > > > > Thanks, > > Huang, Ying > > >