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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 53327C2BA83 for ; Thu, 13 Feb 2020 16:01:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2FDFD2073C for ; Thu, 13 Feb 2020 16:01:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730230AbgBMQBS convert rfc822-to-8bit (ORCPT ); Thu, 13 Feb 2020 11:01:18 -0500 Received: from mx2.suse.de ([195.135.220.15]:56746 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730198AbgBMQBH (ORCPT ); Thu, 13 Feb 2020 11:01:07 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 539D6B197; Thu, 13 Feb 2020 16:01:06 +0000 (UTC) Date: Thu, 13 Feb 2020 07:50:05 -0800 From: Davidlohr Bueso To: Andrew Morton Cc: linux-kernel@vger.kernel.org, mcgrof@kernel.org, broonie@kernel.org, alex.williamson@redhat.com Subject: Re: [PATCH -next 0/5] rbtree: optimize frequent tree walks Message-ID: <20200213155005.devifejlo3jxjzxo@linux-p48b> References: <20200207180305.11092-1-dave@stgolabs.net> <20200209174632.9c7b6ff20567853c05e5ee58@linux-foundation.org> <20200210155611.lfrddnolsyzktqne@linux-p48b> <20200210143546.4491d9715f1c4a0a1de999ca@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8BIT In-Reply-To: <20200210143546.4491d9715f1c4a0a1de999ca@linux-foundation.org> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 10 Feb 2020, Andrew Morton wrote: >Measurable for microbenchmarks, I think? But what benefit will a user >see, running a workload that is cared about? Well avoiding pointer chasing on large SMP systems has been shown to be something we care about in the past. And yes my performance data comes from an adhoc test scenario which only measures iteration latencies but that doesn't mean there isn't value here. Thanks, Davidlohr