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=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 6FD3FC10F27 for ; Mon, 9 Mar 2020 15:33:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4E10E22522 for ; Mon, 9 Mar 2020 15:33:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4E10E22522 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id E381A6B0006; Mon, 9 Mar 2020 11:33:28 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E0F146B0007; Mon, 9 Mar 2020 11:33:28 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D25536B0008; Mon, 9 Mar 2020 11:33:28 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0104.hostedemail.com [216.40.44.104]) by kanga.kvack.org (Postfix) with ESMTP id BDFA86B0006 for ; Mon, 9 Mar 2020 11:33:28 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 87565181AC9CC for ; Mon, 9 Mar 2020 15:33:28 +0000 (UTC) X-FDA: 76576218096.20.table66_127d11f2f753 X-HE-Tag: table66_127d11f2f753 X-Filterd-Recvd-Size: 2221 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by imf25.hostedemail.com (Postfix) with ESMTP for ; Mon, 9 Mar 2020 15:33:27 +0000 (UTC) X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Mar 2020 08:33:26 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,518,1574150400"; d="scan'208";a="260450098" Received: from tassilo.jf.intel.com (HELO tassilo.localdomain) ([10.7.201.21]) by orsmga002.jf.intel.com with ESMTP; 09 Mar 2020 08:33:25 -0700 Received: by tassilo.localdomain (Postfix, from userid 1000) id B93A2301BCC; Mon, 9 Mar 2020 08:33:25 -0700 (PDT) Date: Mon, 9 Mar 2020 08:33:25 -0700 From: Andi Kleen To: "Kirill A. Shutemov" Cc: Cannon Matthews , Mike Kravetz , Andrew Morton , Matthew Wilcox , Michal Hocko , David Rientjes , Greg Thelen , Salman Qazi , linux-mm@kvack.org, linux-kernel@vger.kernel.org, x86@kernel.org Subject: Re: [PATCH] mm: clear 1G pages with streaming stores on x86 Message-ID: <20200309153325.GJ1454533@tassilo.jf.intel.com> References: <20200307010353.172991-1-cannonmatthews@google.com> <20200309000820.f37opzmppm67g6et@box> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200309000820.f37opzmppm67g6et@box> 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: > > Tested: > > Time to `mlock()` a 512GiB region on broadwell CPU > > AVG time (s) % imp. ms/page > > clear_page_erms 133.584 - 261 > > clear_page_nt 34.154 74.43% 67 > > Some macrobenchmark would be great too. Yes especially something that actually uses the memory. I suspect you'll need something like the below > That patchset is somewhat more complex trying to keep the memory around > the fault address hot in cache. In theory it should help to reduce latency > on the first access to the memory. -Andi