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=-2.3 required=3.0 tests=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 648FEC54FC9 for ; Tue, 21 Apr 2020 12:48:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 3EF0920753 for ; Tue, 21 Apr 2020 12:48:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3EF0920753 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E6C9B8E000C; Tue, 21 Apr 2020 08:48:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E1BF48E0003; Tue, 21 Apr 2020 08:48:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D58E88E000C; Tue, 21 Apr 2020 08:48:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0194.hostedemail.com [216.40.44.194]) by kanga.kvack.org (Postfix) with ESMTP id BE18F8E0003 for ; Tue, 21 Apr 2020 08:48:07 -0400 (EDT) Received: from smtpin03.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 6A115583A for ; Tue, 21 Apr 2020 12:48:07 +0000 (UTC) X-FDA: 76731839814.03.store92_29c788c859a4d X-HE-Tag: store92_29c788c859a4d X-Filterd-Recvd-Size: 1876 Received: from mx2.suse.de (mx2.suse.de [195.135.220.15]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Tue, 21 Apr 2020 12:48:06 +0000 (UTC) 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 89067ABC7; Tue, 21 Apr 2020 12:48:04 +0000 (UTC) Subject: Re: [PATCH v2] mm: Optimized hugepage zeroing & copying from user From: Vlastimil Babka To: Will Deacon , Prathu Baronia Cc: catalin.marinas@arm.com, alexander.duyck@gmail.com, chintan.pandya@oneplus.com, mhocko@suse.com, akpm@linux-foundation.org, linux-mm@kvack.org, gregkh@linuxfoundation.com, gthelen@google.com, jack@suse.cz, ken.lin@oneplus.com, gasine.xu@oneplus.com, ying.huang@intel.com, mark.rutland@arm.com References: <20200414153829.GA15230@oneplus.com> <87r1wpzavo.fsf@yhuang-dev.intel.com> <20200419155856.dtwxomdkyujljdfi@oneplus.com> <87k12bt3ff.fsf@yhuang-dev.intel.com> <20200421093621.3fuptvf2qbyfzwfz@oneplus.com> <20200421100932.GC17256@willie-the-truck> Message-ID: <02d5daa8-ee7b-7d2d-6753-5191a7d761b9@suse.cz> Date: Tue, 21 Apr 2020 14:48:04 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 4/21/20 2:47 PM, Vlastimil Babka wrote: > > It was suspected that current Intel can prefetch forward and backwards, and the > tested ARM64 microarchitecture only backwards, can it be true? The current code Oops, tested ARM64 microarchitecture I meant "only forwards". > does clearing backwards.