Received: by 2002:a25:1506:0:0:0:0:0 with SMTP id 6csp701287ybv; Thu, 13 Feb 2020 08:01:35 -0800 (PST) X-Google-Smtp-Source: APXvYqxlbYCCn3MKAMHYsXEY+i8AOjcCCWFszOzT6RCfe4DU63NqzIbNK5mNzCVfvv9vS0nmHUwG X-Received: by 2002:a9d:7dc9:: with SMTP id k9mr13806853otn.117.1581609695559; Thu, 13 Feb 2020 08:01:35 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1581609695; cv=none; d=google.com; s=arc-20160816; b=oWfbwozALch7id5vKZvBvG7U+5xxMc2tJvfgDEQVJPf/1dO0pJSMQBTIc4bKgBAJyj +lhD7uhDx0OYu+xHmj5xIXq5/CC9CqbXOKIXH5RyBWlT1oM/3iODl6NcEpnh/qhiYy+E mCs0P1TkGC0QgaYhSNghnNQ5YR3VOgxL2DegY9i4jhhPGc5YX/O/gKDHoZ7vNTrt+4G3 qxV3W+YR7mHeD49WFu/UQZKQLGijjWSSTsPefG6+gt6CTzLLSePhLAb6O1VNFydUWYCK uaF6nv3z/z7ko8qX8aJVaj7mBcoqbYOqpmq1xTN2OEZNJboLtDfJGR8WKkN9fllxxhgS 10Vw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-transfer-encoding:content-disposition:mime-version :references:message-id:subject:cc:to:from:date; bh=QK3CFyHjD+UW2pqp7roMKruHXAxaJas9qmq5Y0vFyLs=; b=WyDLxbFsPZtVa0iLf1neFUmx3bNMozYhsp6zQpjdDC+WscxUNjx9SRHb9q5+xOIrBF lbIzuwbgBS9kU0BAEAB+c07wxl/w+Z9stz7C4uTGEjhfuH1fk5fAnYMuOytWw1Adsdwa 9ghXG4XxxDBWWpzkSeZGGv20BSUWH35jQtw+iZtK9jMOK/hMSETUlJ7uRBRc25DS4vl3 /vZwozjVNppc+l31fft5/rNEasTp3McTdIYxroxGRsSOvzS28s9flNTUhrYrz7JmOJLn EaEkLPdj/Edw0Ob9PGI+wQ7lOiD/DUxL0R8y03SnVqFU8qfA9KascPNpjQ2gh6Kt6nMC VD7w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id o20si1301270otl.60.2020.02.13.08.01.21; Thu, 13 Feb 2020 08:01:35 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730224AbgBMQBR convert rfc822-to-8bit (ORCPT + 99 others); Thu, 13 Feb 2020 11:01:17 -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