Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753814AbbFKSzi (ORCPT ); Thu, 11 Jun 2015 14:55:38 -0400 Received: from mail-wi0-f194.google.com ([209.85.212.194]:34939 "EHLO mail-wi0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751462AbbFKSzh (ORCPT ); Thu, 11 Jun 2015 14:55:37 -0400 Message-ID: <1434048933.3396.62.camel@gmail.com> Subject: Re: RFC: futex_wait() can DoS the tick From: Mike Galbraith To: Thomas Gleixner Cc: LKML , Peter Zijlstra , Ingo Molnar , Steven Rostedt Date: Thu, 11 Jun 2015 20:55:33 +0200 In-Reply-To: References: <1433940278.6814.66.camel@gmail.com> <1433957421.6306.28.camel@gmail.com> <1433989634.3411.15.camel@gmail.com> <1434022875.4051.5.camel@gmail.com> <1434048238.3396.59.camel@gmail.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.11 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 884 Lines: 23 On Thu, 2015-06-11 at 20:52 +0200, Thomas Gleixner wrote: > On Thu, 11 Jun 2015, Mike Galbraith wrote: > > On Thu, 2015-06-11 at 15:13 +0200, Thomas Gleixner wrote: > > > > > The kernel does not care whether the actual interrupt happens or the > > > timer is expired by other means. > > > > Final question: Notabug explanation fits.. but why would the behavior > > delta be so radical and repeatable w/wo deadline timer on some boxen? > > Good question. Cannot answer that w/o looking at traces. I may come back with some, I spent enough time doing circular notabug chasing all over hell and creation to be a tad annoyed ;-) -Mike -- 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/