From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753438AbaEHMf1 (ORCPT ); Thu, 8 May 2014 08:35:27 -0400 Received: from mga09.intel.com ([134.134.136.24]:40933 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753205AbaEHMf0 (ORCPT ); Thu, 8 May 2014 08:35:26 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.97,1010,1389772800"; d="scan'208";a="508353055" From: Alexander Shishkin To: Peter Zijlstra Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Frederic Weisbecker , Mike Galbraith , Paul Mackerras , Stephane Eranian , Andi Kleen , Adrian Hunter , Matt Fleming Subject: Re: [PATCH v1 03/11] perf: Allow for multiple ring buffers per event In-Reply-To: <20140507152640.GR30445@twins.programming.kicks-ass.net> References: <1391683834-29868-1-git-send-email-alexander.shishkin@linux.intel.com> <1391683834-29868-4-git-send-email-alexander.shishkin@linux.intel.com> <20140507152640.GR30445@twins.programming.kicks-ass.net> User-Agent: Notmuch/0.17+49~gaa57e9d (http://notmuchmail.org) Emacs/24.3.1 (x86_64-pc-linux-gnu) Date: Thu, 08 May 2014 15:34:17 +0300 Message-ID: <87wqdwzbxy.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: > So the aux_head/tail values should also be in the file space and not > start at 0 again, similar for the offsets in the AUX record. Thinking some more about it: if we keep aux_{offset,size} in userpg, then it would make sense to have aux_{head,tail} run from 0 to infinity similar to data_{head,tail}, especially considering that neither data_* nor aux_* pointers are file offsets anyway. Regards, -- Alex