From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id C34CDC65C20 for ; Mon, 8 Oct 2018 14:43:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8EA2E204EC for ; Mon, 8 Oct 2018 14:43:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8EA2E204EC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726625AbeJHVz7 (ORCPT ); Mon, 8 Oct 2018 17:55:59 -0400 Received: from mga01.intel.com ([192.55.52.88]:42914 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726078AbeJHVz6 (ORCPT ); Mon, 8 Oct 2018 17:55:58 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 08 Oct 2018 07:43:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,357,1534834800"; d="scan'208";a="80841113" Received: from linux.intel.com ([10.54.29.200]) by orsmga006.jf.intel.com with ESMTP; 08 Oct 2018 07:43:41 -0700 Received: from [10.252.30.144] (abudanko-mobl.ccr.corp.intel.com [10.252.30.144]) by linux.intel.com (Postfix) with ESMTP id A22DB5801E6; Mon, 8 Oct 2018 07:43:39 -0700 (PDT) Subject: Re: [PATCH v11 1/3]: perf util: map data buffer for preserving collected data To: Jiri Olsa Cc: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Namhyung Kim , Andi Kleen , linux-kernel References: <7d42aa80-8e69-44e4-b963-e8ef89df2099@linux.intel.com> <0ff162a6-67ab-9e73-8d7e-fa57c932ee45@linux.intel.com> <20181008105057.GD17270@krava> <20181008123859.GD18757@krava> From: Alexey Budankov Organization: Intel Corp. Message-ID: Date: Mon, 8 Oct 2018 17:43:38 +0300 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20181008123859.GD18757@krava> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 08.10.2018 15:38, Jiri Olsa wrote: > On Mon, Oct 08, 2018 at 03:03:18PM +0300, Alexey Budankov wrote: >> >> Well, let's go with stub functions design as opposite to pure >> conditional compilation. However this may, probably, result in >> unintended Perf tool binary size growth, even if NO_AIO is >> defined during compilation. > > hum, empty functions are be optimized out Yes, but there will be references to stubs in else branch of record__mmap_read_evlist() so I am not sure that *all* compilers are smart enough to recognize and still optimize it out. Thanks, Alexey > > jirka >