From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753683AbbAEMHO (ORCPT ); Mon, 5 Jan 2015 07:07:14 -0500 Received: from mail-wg0-f51.google.com ([74.125.82.51]:46679 "EHLO mail-wg0-f51.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753636AbbAEMHL (ORCPT ); Mon, 5 Jan 2015 07:07:11 -0500 Message-ID: <1420459627.5267.7.camel@marge.simpson.net> Subject: Re: [RFC][PATCH 0/3] sched: skip_clock_update madness From: Mike Galbraith To: Peter Zijlstra Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org Date: Mon, 05 Jan 2015 13:07:07 +0100 In-Reply-To: <20150105115054.GE3337@twins.programming.kicks-ass.net> References: <20150105101809.860964488@infradead.org> <1420454949.5266.138.camel@marge.simpson.net> <20150105115054.GE3337@twins.programming.kicks-ass.net> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2015-01-05 at 12:50 +0100, Peter Zijlstra wrote: > On Mon, Jan 05, 2015 at 11:49:09AM +0100, Mike Galbraith wrote: > > On Mon, 2015-01-05 at 11:18 +0100, Peter Zijlstra wrote: > > > Hi, > > > > > > So the big lockup thread got me looking at the skip_clock_update stuff again > > > and here's what I came up with. > > > > > > It seems to build a kernel without generating lockdep splats. > > > > > > Mike can you see if it cures the wobblies you were seeing? > > > > Nope, those hiccups were production IO beasts from hell staying in the > > kernel for ages at a time. Watchdog being falsely credited with what is > > usually dinky wakeup -> switch delta throttled it effectively forever. > > OK, It's Monday and I'm still trying to bootstrap my post xmas brain. Is > that: Nope - can't check, or: Nope - doesn't fix wobblies ? That's: nope, the boxen that wobbled to death are not at my disposal. -Mike