Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755513Ab0LEAcj (ORCPT ); Sat, 4 Dec 2010 19:32:39 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:38383 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754372Ab0LEAci convert rfc822-to-8bit (ORCPT ); Sat, 4 Dec 2010 19:32:38 -0500 MIME-Version: 1.0 In-Reply-To: References: <1289783580.495.58.camel@maggy.simson.net> <1289811438.2109.474.camel@laptop> <1289820766.16406.45.camel@maggy.simson.net> <1289821590.16406.47.camel@maggy.simson.net> <20101115125716.GA22422@redhat.com> <1289856350.14719.135.camel@maggy.simson.net> <20101116130413.GA29368@redhat.com> <1289917109.5169.131.camel@maggy.simson.net> <20101116150319.GA3475@redhat.com> <1289922108.5169.185.camel@maggy.simson.net> <20101116172804.GA9930@elte.hu> <1290281700.28711.9.camel@maggy.simson.net> From: Linus Torvalds Date: Sat, 4 Dec 2010 16:31:42 -0800 Message-ID: Subject: Re: [PATCH v4] sched: automated per session task groups To: Colin Walters Cc: Mike Galbraith , Ingo Molnar , Oleg Nesterov , Peter Zijlstra , Markus Trippelsdorf , Mathieu Desnoyers , LKML Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1360 Lines: 31 On Sat, Dec 4, 2010 at 3:43 PM, Colin Walters wrote: > On Sat, Dec 4, 2010 at 5:39 PM, Linus Torvalds > wrote: > >> And it doesn't hurt you. If you're happy with "nice", go on and use >> it. Why are you even discussing it? > > Because it seems to me like a bug if it isn't as good as group > scheduling? ?Most of your message is saying it's worthless, and I > don't disagree that it's not very good *right now*. ?I guess where we > disagree is whether it's worth fixing. It's not worth 'fixing", because it works exactly like it's designed - and supposed - to work. There really isn't anything to fix. 'nice' is what it is. It's a simple legacy interface to scheduler priority. The fact that it's also almost totally useless is irrelevant. It's like male nipples. We wouldn't be better off lactating, and they look like some odd wart that doesn't do much good. But it would be worse to remove it. 'nice' is a bad idea. It's a bad idea that has perfectly understandable historical reasons for it, but it's an _unfixably_ bad idea. Linus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/