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=-3.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 6C4B2C433DF for ; Thu, 23 Jul 2020 18:48:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 465DE207BB for ; Thu, 23 Jul 2020 18:48:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="F/slu0yr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728041AbgGWSsT (ORCPT ); Thu, 23 Jul 2020 14:48:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33022 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726349AbgGWSsS (ORCPT ); Thu, 23 Jul 2020 14:48:18 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 50ADBC0619DC; Thu, 23 Jul 2020 11:48:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=1f7jSo8LA10wBMQErGxZHBOUpBnSmikLw3twngiB9do=; b=F/slu0yrPHxiFr2ZrGc9sNP3ns LfcamOV4YCSjJmAGql8AMoxgRpgB7ejoGOoyBLRe1+NSiLXfp9s6mu47IldFSbQMbbcbjzbuf5u9O 833qpQHg1wNCif0Lkq4328/WTptDw86N2VO7KfNGktPrwAGmjr8DSQjE1+eFSW1K8SBisHKNbRDV7 cmLO0EzWU8yk6Qi6ew5Fj8GFbqy5DhWcjYesQlU6LImS6PD+RqUFfZR8xNf4Vgk5d/STeIWcbrgB3 HEhT+oCJJ9EhcXF59Ajf1oGcNx4KwTMd9LXGPsPEGnP5wOjXWz5J0tqHK64RSquaQFlBJPTpvUZQp TcS/d44Q==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jygG9-0004Wx-0f; Thu, 23 Jul 2020 18:48:01 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 28C213013E5; Thu, 23 Jul 2020 20:47:59 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id C4A532010461D; Thu, 23 Jul 2020 20:47:59 +0200 (CEST) Date: Thu, 23 Jul 2020 20:47:59 +0200 From: peterz@infradead.org To: Waiman Long Cc: Michael Ellerman , Nicholas Piggin , linuxppc-dev@lists.ozlabs.org, Will Deacon , Boqun Feng , Ingo Molnar , Anton Blanchard , linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org Subject: Re: [PATCH v3 5/6] powerpc/pseries: implement paravirt qspinlocks for SPLPAR Message-ID: <20200723184759.GS119549@hirez.programming.kicks-ass.net> References: <20200706043540.1563616-1-npiggin@gmail.com> <20200706043540.1563616-6-npiggin@gmail.com> <874kqhvu1v.fsf@mpe.ellerman.id.au> <8265d782-4e50-a9b2-a908-0cb588ffa09c@redhat.com> <20200723140011.GR5523@worktop.programming.kicks-ass.net> <845de183-56f5-2958-3159-faa131d46401@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <845de183-56f5-2958-3159-faa131d46401@redhat.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jul 23, 2020 at 02:32:36PM -0400, Waiman Long wrote: > BTW, do you have any comment on my v2 lock holder cpu info qspinlock patch? > I will have to update the patch to fix the reported 0-day test problem, but > I want to collect other feedback before sending out v3. I want to say I hate it all, it adds instructions to a path we spend an aweful lot of time optimizing without really getting anything back for it. Will, how do you feel about it?