From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752431Ab0LFA3N (ORCPT ); Sun, 5 Dec 2010 19:29:13 -0500 Received: from lennier.cc.vt.edu ([198.82.162.213]:36208 "EHLO lennier.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751621Ab0LFA3M (ORCPT ); Sun, 5 Dec 2010 19:29:12 -0500 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Colin Walters Cc: Linus Torvalds , Mike Galbraith , Ingo Molnar , Oleg Nesterov , Peter Zijlstra , Markus Trippelsdorf , Mathieu Desnoyers , LKML Subject: Re: [PATCH v4] sched: automated per session task groups In-Reply-To: Your message of "Sat, 04 Dec 2010 15:01:16 EST." From: Valdis.Kletnieks@vt.edu 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> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1291595300_67929P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Sun, 05 Dec 2010 19:28:20 -0500 Message-ID: <201565.1291595300@localhost> X-Mirapoint-Received-SPF: 128.173.34.103 localhost Valdis.Kletnieks@vt.edu 2 pass X-Mirapoint-IP-Reputation: reputation=neutral-1, source=Fixed, refid=n/a, actions=MAILHURDLE SPF TAG X-Junkmail-Status: score=10/50, host=zidane.cc.vt.edu X-Junkmail-Signature-Raw: score=unknown, refid=str=0001.0A020208.4CFC2E25.0173,ss=1,fgs=0, ip=0.0.0.0, so=2010-07-22 22:03:31, dmn=2009-09-10 00:05:08, mode=single engine X-Junkmail-IWF: false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1291595300_67929P Content-Type: text/plain; charset="us-ascii" Content-Id: <201559.1291595300.1@localhost> On Sat, 04 Dec 2010 15:01:16 EST, Colin Walters said: > Look around...where? On what basis are you making that claim? I did > a quick web search for "unix background process", and this tutorial > (in the first page of Google search results) aimed at grad students > who use Unix at college definitely describes "nice make": > http://acs.ucsd.edu/info/jobctrl.shtml The fact that something is documented doesn't mean the documentation actually is correct. There exists a Linux guide written by somebody (who has enough of a rep that you can safely say "should have known better") who didn't understand the difference between traditional Unix and Linux, nor what the original concept was, and it documented the proper way to take a system down quickly as: # sync;sync;sync;halt Of course, the *original* was: # sync # sync # sync # halt And the whole point of 3 syncs was that the typing time of the second and third sync's chewed up the time till the first sync finished. Of course, sync;sync doesn't start the first sync and then make you type. And it overlooked that the Linux sync is a lot more synchronous than the ATT Unix sync, which returned as soon as the I/O was scheduled, not completed. --==_Exmh_1291595300_67929P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD4DBQFM/C4kcC3lWbTT17ARAuqDAJ4uZu+HwjE4w0MRXVjJWUE4rEH6WACY03CS 08xgStJ7qqW4vu+DC8uf5w== =5vU+ -----END PGP SIGNATURE----- --==_Exmh_1291595300_67929P--