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=-11.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 14742C47082 for ; Tue, 8 Jun 2021 16:45:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E0DDD6128A for ; Tue, 8 Jun 2021 16:45:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231696AbhFHQrY (ORCPT ); Tue, 8 Jun 2021 12:47:24 -0400 Received: from mail.kernel.org ([198.145.29.99]:37074 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231278AbhFHQrX (ORCPT ); Tue, 8 Jun 2021 12:47:23 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 89E956127A; Tue, 8 Jun 2021 16:45:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623170730; bh=5+e3G0jIDFHNWhBPwTgnEov6WJW2KTJ2WUUQaajrIso=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=DH9rM21HpBpLvs5vxfMMXLPAHpNVYPLJQ51jeCsuy5SbZBAn0ifA7hJzmjZzzo1Sm AZ0NcnspjeDKTDLFvDskVzOmlnh1f5YqlaAkmMNRAHTHhr3qwCmAK2K08k2JiIKzq+ alHfp++TTOKox7Ry+W/Y2VA19uHVCMsTDyx/asfndcHbyBHb73e5R5CffKLquObpbp zvIjbYomJarG0yrZpxhqqGX3wcxxmpbkeemBl+a+OysfUkK0EBlPRgxJZ/c6fBxRJA afhPnzVKw90VIqq9TI9j+BGMoeaL8k27ZGj2jr46wMQbnWNC2vXwAANDkta9F7ofNu GRZZnAI7M3jVw== Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id D675440B1A; Tue, 8 Jun 2021 13:45:27 -0300 (-03) Date: Tue, 8 Jun 2021 13:45:27 -0300 From: Arnaldo Carvalho de Melo To: Peter Zijlstra Cc: Leo Yan , Ingo Molnar , Mark Rutland , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Thomas Gleixner , x86@kernel.org, "H. Peter Anvin" , Mathieu Poirier , Suzuki K Poulose , Mike Leach , Adrian Hunter , Andi Kleen , linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 5/8] perf auxtrace: Change to use SMP memory barriers Message-ID: References: <20210602103007.184993-1-leo.yan@linaro.org> <20210602103007.184993-6-leo.yan@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com Precedence: bulk List-ID: X-Mailing-List: linux-perf-users@vger.kernel.org Em Mon, Jun 07, 2021 at 05:29:55PM +0200, Peter Zijlstra escreveu: > On Wed, Jun 02, 2021 at 06:30:04PM +0800, Leo Yan wrote: > > The kernel and the userspace tool can access the AUX ring buffer head > > and tail from different CPUs, thus SMP class of barriers are required > > on SMP system. > > > > This patch changes to use SMP barriers to replace mb() and rmb() > > barriers. > > > > Signed-off-by: Leo Yan > > Acked-by: Peter Zijlstra (Intel) Thanks, applied. - Arnaldo