From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753451AbXKSMbd (ORCPT ); Mon, 19 Nov 2007 07:31:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751993AbXKSMbZ (ORCPT ); Mon, 19 Nov 2007 07:31:25 -0500 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:50384 "EHLO the-village.bc.nu" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751875AbXKSMbY (ORCPT ); Mon, 19 Nov 2007 07:31:24 -0500 Date: Mon, 19 Nov 2007 12:29:36 +0000 From: Alan Cox To: raju@linux-delhi.org Cc: linux-kernel@vger.kernel.org Subject: Re: Query on kernel metrics available Message-ID: <20071119122936.6e209a18@the-village.bc.nu> In-Reply-To: <200711191259.26502.raju@linux-delhi.org> References: <200711191259.26502.raju@linux-delhi.org> X-Mailer: Claws Mail 2.10.0 (GTK+ 2.10.14; i386-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 19 Nov 2007 12:59:26 +0530 Raj Mathur wrote: > A competing OS vendor is claiming that the Linux kernel has no way to > measure the following: > > a. Time spent waiting for page faults in percent > > b. Total transfer time for each auxiliary memory in percent > > c. Time in percent when one or more tasks were blocked waiting for > memory resources > > d. Time spent waiting for page faults in percent a an d appear to be the same thing > I was wondering if the claims were pure FUD or are measurements > possible -- whether they are actually implemented or not is not > important (at least at this stage). Apologies if the descriptions > aren't very precise; OTOH that leaves us room to interpret the claims > in a favourable (to us) manner :) Systemtap as shipped by most of the enterprise vendors can measure all of this quite easily. Alan