From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754170AbYIBGQ4 (ORCPT ); Tue, 2 Sep 2008 02:16:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752813AbYIBGQr (ORCPT ); Tue, 2 Sep 2008 02:16:47 -0400 Received: from smtp03.osg.ufl.edu ([128.227.74.70]:59573 "EHLO smtp.ufl.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752757AbYIBGQq (ORCPT ); Tue, 2 Sep 2008 02:16:46 -0400 X-Greylist: delayed 7478 seconds by postgrey-1.27 at vger.kernel.org; Tue, 02 Sep 2008 02:16:46 EDT Message-ID: <1942732773.182121220328723728.JavaMail.osg@osgjas04.cns.ufl.edu> Date: Tue, 2 Sep 2008 00:12:03 -0400 (EDT) From: "CHADHA,VINEET" To: nickpiggin@yahoo.com.au Subject: TLB evaluation for Linux Cc: linux-kernel@vger.kernel.org, vineet@ufl.edu MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: GatorMail WebMail (http://GatorMail.sf.net/) X-Originating-IP: 10.5.153.246 [10.5.153.246] X-UFL-Spam-Status: hits=-3, required=5, tests=ALL_TRUSTED X-UFL-Scanned-By: CNS Open Systems Group (http://open-systems.ufl.edu/services/smtp-relay/) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I have been working to evaluate TLB performance for Linux O/S and virtualized workloads(such as Xen) in a Full system simulator(e.g. simics). While my evaluation is in nascent stage, I do notice that most of the IPIs in multi-core environments cause complete TLB Flush. I want to evaluate cost of TLB shootdown including re-population vs. each entry shootdown (invlpg). While a similar study has been done in other kernels (e.g. L4 kernel), I am not aware if it has been done for Linux O/S. Are there hooks or patches to test or evaluate TLB performance. Specifically, I would like to know where to make changes in Linux kernel to support each entry shootdown. Questions may sound little naive, but any pointers or related work will be helpful to me. Thanks in advance. Regards, Vineet