From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753704AbYIHNkN (ORCPT ); Mon, 8 Sep 2008 09:40:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751901AbYIHNkA (ORCPT ); Mon, 8 Sep 2008 09:40:00 -0400 Received: from casper.infradead.org ([85.118.1.10]:39690 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751342AbYIHNj7 (ORCPT ); Mon, 8 Sep 2008 09:39:59 -0400 Date: Mon, 8 Sep 2008 06:40:02 -0700 From: Arjan van de Ven To: Pavel Machek Cc: linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, dwmw2@infradead.org, drepper@redhat.com, mingo@elte.hu, tglx@tglx.de Subject: Re: [PATCH 12/13] hrtimer: create a "timer_slack" field in the task struct Message-ID: <20080908064002.7abc2a22@infradead.org> In-Reply-To: <20080908132713.GA18486@elf.ucw.cz> References: <20080901160343.75a89ec9@infradead.org> <20080901161423.59ebf2fc@infradead.org> <20080902100439.GA11383@elf.ucw.cz> <20080902060323.70245b83@infradead.org> <20080908132713.GA18486@elf.ucw.cz> Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.11; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 8 Sep 2008 15:27:16 +0200 Pavel Machek wrote: > > > > ... which nobody uses today. > > It's not just new syscalls, it's a new glibc api as well at that > > point. > > ...and new applications, yes. I believe applications should > explicitely enable slacking timers. timers are slacking today, at least for select() and poll(), and are a great deal more so than the defaults in this patchkit. The great advantage of the prctl() approach (which is usable) over new system calls and glibc APIs is that it will get used, because the admin can use it just like he uses the "nice" command, on existing software. -- If you want to reach me at my work email, use arjan@linux.intel.com For development, discussion and tips for power savings, visit http://www.lesswatts.org