From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756504Ab1CHIfI (ORCPT ); Tue, 8 Mar 2011 03:35:08 -0500 Received: from mailout-de.gmx.net ([213.165.64.22]:44269 "HELO mailout-de.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1756368Ab1CHIfG (ORCPT ); Tue, 8 Mar 2011 03:35:06 -0500 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/HaxsE8knHG6FkznHnOBgRLN99OngaQIOBem35UK 3OOwUMv77W4Rfs Subject: Re: [patchlet] sched: fix rt throttle runtime borrowing From: Mike Galbraith To: Yong Zhang Cc: LKML , Peter Zijlstra , Ingo Molnar In-Reply-To: References: <1299486101.14465.25.camel@marge.simson.net> <1299490414.14465.74.camel@marge.simson.net> Content-Type: text/plain; charset="UTF-8" Date: Tue, 08 Mar 2011 09:28:12 +0100 Message-ID: <1299572892.7949.16.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.30.1.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2011-03-08 at 16:19 +0800, Yong Zhang wrote: > On Mon, Mar 7, 2011 at 5:33 PM, Mike Galbraith wrote: > > Well, it does prevent complete death, but you have to be pretty darn > > attentive to notice that the patient is still technically alive ;-) > > > > As such, turning borrowing off by default, and making borrowing up to > > within a micron of 100% CPU an opt-in feature likely makes more sense. > > Another idea comes into my head is: disable runtime borrowing for > root_task_group forever by default, but keep current behavior > for the sub-groups :) Yeah, that's one of the things I was pondering. No parent, no borrowing. -Mike