From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964943AbWLMGOp (ORCPT ); Wed, 13 Dec 2006 01:14:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964945AbWLMGOp (ORCPT ); Wed, 13 Dec 2006 01:14:45 -0500 Received: from web27404.mail.ukl.yahoo.com ([217.146.177.180]:30760 "HELO web27404.mail.ukl.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S964943AbWLMGOo (ORCPT ); Wed, 13 Dec 2006 01:14:44 -0500 X-Greylist: delayed 401 seconds by postgrey-1.27 at vger.kernel.org; Wed, 13 Dec 2006 01:14:44 EST DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.co.uk; h=Message-ID:X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=AL03oRoWiGie2HO2/d6oRUNuzmbgo+IMfY9UfI8HwOWUPFIOPEObFaV3L4jFS+2t16Vh2/BrbYTNvH++lpXjLW2uybMrKcK/KTVCm8spRU4xfDyf9Pp/NbtiU9k4LTELCkwDX5dXq7QGe5udp7vAqTjFMKnDqjwc7NE696hLKuU= ; Message-ID: <20061213060802.78275.qmail@web27404.mail.ukl.yahoo.com> X-YMail-OSG: bLfFNI4VM1k8ACYrV1TXe5XqfkRnuxn8zMAsy6MgCGXuFtLPgG5APO42b6Q0CDc6Lxf0D4aLc.wogbtR8p6EWN5rAPgDWfXLbJ.WnZa0jr89jVP6jKA- Date: Wed, 13 Dec 2006 06:08:02 +0000 (GMT) From: ranjith kumar Subject: writing to performance monitoring register To: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, I want to measure number of last level cache misses in Pentium 4 processor. In IA-32 programmers manuals it was given that there are (architectural= same across all IA-32 processors)perfomance monitoring counters starting at address 0c1H and performance_event_select registers starting at address 186H. 1) When I tried to run a kernel module to write some value in performance event select register (with address 186H) by wrmsr instruction, the system is hanging.Why? The program is : #include /* Needed by all modules */ #include /* Needed for KERN_INFO */ //#include int i,j,k=0; unsigned int xx,yy,xx1,yy1,xx2,yy2; unsigned int t1,t2,t3,t4,BIG=0xffffffff; int init_module(void) { asm volatile (" movl $0x186, %%ecx;" " movl $0x0, %%edx;" " movl $0x0009412E, %%eax;" " wrmsr;" : : :"%eax","%edx","%ecx"); printk(KERN_INFO " Initially %u=t1 %u=t2 %u=t3 %u=t4 \n",t1,t2,t3,t4); return 0; } void cleanup_module(void) { printk(KERN_INFO "Goodbye world \n"); } ------------------------------------------------------- 2) Why I am getting compilation errors when I tried to include or ....files? Thanks in advane. ___________________________________________________________ All New Yahoo! Mail – Tired of Vi@gr@! come-ons? Let our SpamGuard protect you. http://uk.docs.yahoo.com/nowyoucan.html