Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754214AbaJHTCu (ORCPT ); Wed, 8 Oct 2014 15:02:50 -0400 Received: from www.linutronix.de ([62.245.132.108]:38999 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751866AbaJHTCt (ORCPT ); Wed, 8 Oct 2014 15:02:49 -0400 Date: Wed, 8 Oct 2014 21:02:16 +0200 (CEST) From: Thomas Gleixner To: Peter Zijlstra cc: Matt Fleming , Ingo Molnar , Jiri Olsa , Arnaldo Carvalho de Melo , linux-kernel@vger.kernel.org, "H. Peter Anvin" , Matt Fleming Subject: Re: [PATCH 11/11] perf/x86/intel: Perform rotation on Intel CQM RMIDs In-Reply-To: <20141008180814.GH4750@worktop.programming.kicks-ass.net> Message-ID: References: <1411567455-31264-1-git-send-email-matt@console-pimps.org> <1411567455-31264-12-git-send-email-matt@console-pimps.org> <20141008180814.GH4750@worktop.programming.kicks-ass.net> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 8 Oct 2014, Peter Zijlstra wrote: > On Wed, Sep 24, 2014 at 03:04:15PM +0100, Matt Fleming wrote: > > + preempt_disable(); < SNIP loooong code > > > + preempt_enable(); > > Why is all that under preempt_disable()? To make life harder for people who care about latencies and deterministic behaviour perhaps? Thanks, tglx -- 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/