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=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 8F49DC55185 for ; Tue, 21 Apr 2020 17:16:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 65A8F206D5 for ; Tue, 21 Apr 2020 17:16:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Da93zyF2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 65A8F206D5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=B1uVk8ctoq7zL0rZ4ZmV4SxMUUTQnd98lyXuxdgFXzs=; b=Da93zyF2kVnvyn Ywjk+r/Nen75EG+Vg2hGwmkqFPkibqJCCIUUZVfVt4Vh2QQoOxBcLmtKvaC3vDH6erKyaUkeindbr JrAK4plYrQHpfRQqgLB72i6Y82B6MQiJTMjW66pnZVTPP7c7iprAicXDu2loU9mwT71pc42YSwG0X +AFz0zD9GDyeR++dTJ5Xq6gPr7Qy/Xsjgh6jZtIHI+kjSY33/1u1hs66GXaaiXOs62mQEeync9Wyv mfnN7tQpObghvyA0zDxqAzJ+CPQmGkmQYAPCTzjGESFQLSLhXzM89mhHhOnx/3TrhpwFBh0gybYSs eA9fDtK4hydJa7f0X14g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQwVn-00078d-Gb; Tue, 21 Apr 2020 17:16:43 +0000 Received: from hch by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQwVl-00077n-1R; Tue, 21 Apr 2020 17:16:41 +0000 Date: Tue, 21 Apr 2020 10:16:41 -0700 From: Christoph Hellwig To: Peter Zijlstra Subject: Re: [PATCH v1 1/6] arm64: Detect the ARMv8.4 TTL feature Message-ID: <20200421171641.GA25391@infradead.org> References: <20200403090048.938-1-yezhenyu2@huawei.com> <20200403090048.938-2-yezhenyu2@huawei.com> <20200421165346.GA11171@infradead.org> <20200421171328.GW20730@hirez.programming.kicks-ass.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200421171328.GW20730@hirez.programming.kicks-ass.net> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, catalin.marinas@arm.com, linux-mm@kvack.org, guohanjun@huawei.com, will@kernel.org, linux-arch@vger.kernel.org, yuzhao@google.com, maz@kernel.org, suzuki.poulose@arm.com, steven.price@arm.com, Christoph Hellwig , arm@kernel.org, Dave.Martin@arm.com, arnd@arndb.de, Zhenyu Ye , npiggin@gmail.com, zhangshaokun@hisilicon.com, broonie@kernel.org, rostedt@goodmis.org, prime.zeng@hisilicon.com, kuhn.chenqun@huawei.com, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, xiexiangyou@huawei.com, linux-kernel@vger.kernel.org, aneesh.kumar@linux.ibm.com, akpm@linux-foundation.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 21, 2020 at 07:13:28PM +0200, Peter Zijlstra wrote: > On Tue, Apr 21, 2020 at 09:53:46AM -0700, Christoph Hellwig wrote: > > On Fri, Apr 03, 2020 at 05:00:43PM +0800, Zhenyu Ye wrote: > > > From: Marc Zyngier > > > > > > In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL > > > feature allows TLBs to be issued with a level allowing for quicker > > > invalidation. > > > > What does "issued with a level" mean? > > What I understood it to be is page-size based on page-table hierarchy. > Just like we have on x86, 4k, 2m, 1g etc.. > > So where x86 INVLPG will tear down any sized page for the address given, > you can now day, kill me the PMD level translation for @addr. > > Power9 radix also has things like this. Maybe this needs to be spelled out a little more? The current commit log sounds like paper generated by a neural network. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel