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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 4084EC4360C for ; Fri, 4 Oct 2019 13:02:45 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A17EE207FF for ; Fri, 4 Oct 2019 13:02:44 +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="WNYaAQrz" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A17EE207FF Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 46l95Y59CfzDqfS for ; Fri, 4 Oct 2019 23:02:41 +1000 (AEST) Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=infradead.org (client-ip=2001:8b0:10b:1231::1; helo=merlin.infradead.org; envelope-from=peterz@infradead.org; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=infradead.org header.i=@infradead.org header.b="WNYaAQrz"; dkim-atps=neutral Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 46l9170YRlzDqfJ for ; Fri, 4 Oct 2019 22:58:49 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.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:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=gziY0QPDoN+D67g/pegaiB9r7XTqW6eyuhADb+3Gl4g=; b=WNYaAQrzrJPPYmFXDdwXjPrZq DA6i1y6J+LYGla3XFujxqjsZUp44vbwC9VMhA/Roa8r3yunXG4GuMejGR349wZwrKwaSGaIkKrM13 F4wk0+4XXbStZwQmKKOekldEA0/92s8tadh+3QN551oj0z9AblNu8v5MmwqeFmZvJO+bZazToEwWn 6r+BRQ26c1nWKnte2yatozu38UZvKERvI06DNxcKysAg3As4YKIqcN8flu2R/t45ja24BeilPC5B6 VijNSIlp/Iql5koQizGvhEzJ3Tu64qy7SEnhu95IOKxa9UvGR+LRTuG69Jvq1vfoKGBE76RiPkwZj Rsn5DhMEA==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.2 #3 (Red Hat Linux)) id 1iGN9l-0007A6-Ht; Fri, 04 Oct 2019 12:58:02 +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 3028030600C; Fri, 4 Oct 2019 14:57:07 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id D71F5201880A5; Fri, 4 Oct 2019 14:57:56 +0200 (CEST) Date: Fri, 4 Oct 2019 14:57:56 +0200 From: Peter Zijlstra To: Leonardo Bras Subject: Re: [PATCH v5 00/11] Introduces new count-based method for tracking lockless pagetable walks Message-ID: <20191004125756.GA32620@hirez.programming.kicks-ass.net> References: <20191003013325.2614-1-leonardo@linux.ibm.com> <20191003072952.GN4536@hirez.programming.kicks-ass.net> <20191004114236.GD19463@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191004114236.GD19463@hirez.programming.kicks-ass.net> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Song Liu , Michal Hocko , Mahesh Salgaonkar , "Dmitry V. Levin" , Keith Busch , linux-mm@kvack.org, Paul Mackerras , Christoph Lameter , Ira Weiny , Ingo Molnar , Elena Reshetova , linux-arch@vger.kernel.org, Santosh Sivaraj , Davidlohr Bueso , "Aneesh Kumar K.V" , Jann Horn , Mike Rapoport , Jason Gunthorpe , Allison Randal , Jesper Dangaard Brouer , Andrey Ryabinin , Alexey Dobriyan , Andrea Arcangeli , Ralph Campbell , Arnd Bergmann , Bartlomiej Zolnierkiewicz , John Hubbard , linuxppc-dev@lists.ozlabs.org, Nicholas Piggin , =?iso-8859-1?B?Suly9G1l?= Glisse , Mathieu Desnoyers , kvm-ppc@vger.kernel.org, Dan Williams , Reza Arbab , Vlastimil Babka , Christian Brauner , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, Thomas Gleixner , Souptick Joarder , Andrew Morton , Logan Gunthorpe , Roman Gushchin , "Kirill A. Shutemov" , Al Viro Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Fri, Oct 04, 2019 at 01:42:36PM +0200, Peter Zijlstra wrote: > If you can find anything there that isn't right, please explain that in > detail and we'll need to look hard at fixing _that_. Also, I can't imagine Nick is happy with 128 CPUs banging on that atomic counter, esp. since atomics are horrifically slow on Power.