From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758758Ab3LGR3a (ORCPT ); Sat, 7 Dec 2013 12:29:30 -0500 Received: from one.firstfloor.org ([193.170.194.197]:57221 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753073Ab3LGR31 (ORCPT ); Sat, 7 Dec 2013 12:29:27 -0500 Date: Sat, 7 Dec 2013 18:29:26 +0100 From: Andi Kleen To: Mike Galbraith Cc: Andi Kleen , linux-kernel@vger.kernel.org, x86@kernel.org, Andi Kleen , lenb@kernel.org, tglx@linutronix.de, peterz@infradead.org Subject: Re: [PATCH] Trace idle entry and exit times Message-ID: <20131207172926.GD21717@two.firstfloor.org> References: <1386377164-2223-1-git-send-email-andi@firstfloor.org> <1386392252.5673.31.camel@marge.simpson.net> <20131207052029.GC21717@two.firstfloor.org> <1386404544.5673.88.camel@marge.simpson.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1386404544.5673.88.camel@marge.simpson.net> User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > > Well that one is obvious. I mean more the subtle problems. > > Yeah, not subtle. SGI could use C2 as power supply stress tester. This is only on system where the APIC timer does not tick in deep idle. At this point these are 5+ year old systems. There were some ideas of breaking up that lock, but they were never fully implemented. -Andi