Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756414AbaJXMNZ (ORCPT ); Fri, 24 Oct 2014 08:13:25 -0400 Received: from mga11.intel.com ([192.55.52.93]:41703 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756091AbaJXMNX (ORCPT ); Fri, 24 Oct 2014 08:13:23 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,780,1406617200"; d="scan'208";a="610580027" From: Alexander Shishkin To: Peter Zijlstra Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Robert Richter , Frederic Weisbecker , Mike Galbraith , Paul Mackerras , Stephane Eranian , Andi Kleen , kan.liang@intel.com, adrian.hunter@intel.com, acme@infradead.org Subject: Re: [PATCH v5 12/20] x86: perf: intel_pt: Intel PT PMU driver In-Reply-To: <20141024115131.GY21513@worktop.programming.kicks-ass.net> References: <1413207948-28202-1-git-send-email-alexander.shishkin@linux.intel.com> <1413207948-28202-13-git-send-email-alexander.shishkin@linux.intel.com> <20141022144543.GV12706@worktop.programming.kicks-ass.net> <87tx2t27yb.fsf@ashishki-desk.ger.corp.intel.com> <20141024115131.GY21513@worktop.programming.kicks-ass.net> User-Agent: Notmuch/0.17+49~gaa57e9d (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu) Date: Fri, 24 Oct 2014 15:13:19 +0300 Message-ID: <87wq7pd5sw.fsf@ashishki-desk.ger.corp.intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter Zijlstra writes: > On Fri, Oct 24, 2014 at 11:22:20AM +0300, Alexander Shishkin wrote: >> > The fact that the hardware cannot even tell you the supported mask is >> > further fail. > >> The problem with this is that some bits go in groups, there'd be 2..3..4 >> bit fields encoding desired packet frequency, for example. > > OK, so put the magic number in the big model array. I'm not sure I follow. These bits are reserved for the future, they can potentially be whatever combinations of whatever. If we want to probe around for valid combinations is to check everything in the range of 0..2^43 (or something like that, the region reserved for packet enables) and store all the valid ones, which sounds crazy. -- 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/