From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760480AbaKAT7t (ORCPT ); Sat, 1 Nov 2014 15:59:49 -0400 Received: from www.linutronix.de ([62.245.132.108]:47449 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760093AbaKAT7p (ORCPT ); Sat, 1 Nov 2014 15:59:45 -0400 Date: Sat, 1 Nov 2014 20:59:35 +0100 (CET) From: Thomas Gleixner To: Andy Lutomirski cc: Peter Zijlstra , Valdis Kletnieks , "linux-kernel@vger.kernel.org" , Paul Mackerras , Arnaldo Carvalho de Melo , Ingo Molnar , Kees Cook , Andrea Arcangeli , Vince Weaver , "hillf.zj" , x86@kernel.org Subject: Re: [PATCH v2 5/8] perf: Add pmu callbacks to track event mapping and unmapping In-Reply-To: <266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.net> Message-ID: References: <266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.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 Fri, 24 Oct 2014, Andy Lutomirski wrote: I'm probably missing something. Why is this tied to the mmap? If I just open a counter then I should be able to read the counter from user space w/o mmapping something in the first place. Thanks, tglx