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=-3.6 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 9904BC5519F for ; Mon, 30 Nov 2020 09:32:45 +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 CE78720809 for ; Mon, 30 Nov 2020 09:32:44 +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="AenMzpFa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CE78720809 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 4Cl0Pz23PNzDqVH for ; Mon, 30 Nov 2020 20:32:39 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=none (no SPF record) smtp.mailfrom=infradead.org (client-ip=2001:8b0:10b:1236::1; helo=casper.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; secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256 header.s=casper.20170209 header.b=AenMzpFa; dkim-atps=neutral Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::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 4Cl0M44HxlzDrFP for ; Mon, 30 Nov 2020 20:30:08 +1100 (AEDT) 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=Qm+mEK06jeIylWH4CfquOTPlX9S20bRHRY0l3x6+Qik=; b=AenMzpFaJkqNGAxuS8hKwAiMgA 4ISTolEMS6eong2QZUaJjw2leQiObEK1qwozGsZ4f+nZbatk0DJ2MX5ZWdkZ0Xb9n5e0iQZ+gVZVf eduxONkowfOwtFnYMslTOdP38vvcJ+wHngenPmoWUE5LACtwPElVRB3eJHFvkLEtmeX64ZILYX2fs eHv2D5HfAxa5r8rZV4MPuyD5rfqFkGcfBTfvefdL52q0ZeC3nQk3fC50qcXi8GxYh8O+orGpTG+QN 8MQjbdH3TcGu4sRFR61XMC4uzyQDW4KEW079MA7FTJjpU/yJLSwla0Ci/q3yyLpIiK+tKyiKBad2e zcHfSNyg==; 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 1kjfVQ-0007lb-Ue; Mon, 30 Nov 2020 09:30:01 +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 3B1F9305815; Mon, 30 Nov 2020 10:30:00 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 26073203EEFB6; Mon, 30 Nov 2020 10:30:00 +0100 (CET) Date: Mon, 30 Nov 2020 10:30:00 +0100 From: Peter Zijlstra To: Andy Lutomirski Subject: Re: [PATCH 6/8] lazy tlb: shoot lazies, a non-refcounting lazy tlb option Message-ID: <20201130093000.GM2414@hirez.programming.kicks-ass.net> References: <20201128160141.1003903-1-npiggin@gmail.com> <20201128160141.1003903-7-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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: linux-arch , Arnd Bergmann , X86 ML , LKML , Nicholas Piggin , Linux-MM , Mathieu Desnoyers , linuxppc-dev Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Sat, Nov 28, 2020 at 07:54:57PM -0800, Andy Lutomirski wrote: > This means that mm_cpumask operations won't need to be full barriers > forever, and we might not want to take the implied full barriers in > set_bit() and clear_bit() for granted. There is no implied full barrier for those ops.