From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from burns.conectiva (burns.conectiva [10.0.0.4]) by perninha.conectiva.com.br (Postfix) with SMTP id 72C4138DEB for ; Tue, 14 May 2002 13:36:11 -0300 (EST) Date: Tue, 14 May 2002 13:36:00 -0300 (BRT) From: Rik van Riel Subject: Re: [RFC][PATCH] iowait statistics In-Reply-To: <20020514153956.GI15756@holomorphy.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: William Lee Irwin III Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Tue, 14 May 2002, William Lee Irwin III wrote: > On Mon, May 13, 2002 at 10:19:26PM -0300, Rik van Riel wrote: > > 2) if no process is running, the timer interrupt adds a jiffy > > to the iowait time > [...] > > 4) on SMP systems the iowait time can be overestimated, no big > > deal IMHO but cheap suggestions for improvement are welcome ^^^^^ > This appears to be global across all cpu's. Maybe nr_iowait_tasks > should be accounted on a per-cpu basis, where While your proposal should work, somehow I doubt it's worth the complexity. It's just a statistic to help sysadmins ;) regards, Rik -- http://www.linuxsymposium.org/2002/ "You're one of those condescending OLS attendants" "Here's a nickle kid. Go buy yourself a real t-shirt" http://www.surriel.com/ http://distro.conectiva.com/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/