From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751447AbaKEW6z (ORCPT ); Wed, 5 Nov 2014 17:58:55 -0500 Received: from mga11.intel.com ([192.55.52.93]:3597 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750879AbaKEW6w (ORCPT ); Wed, 5 Nov 2014 17:58:52 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,322,1413270000"; d="scan'208";a="627292760" From: Andi Kleen To: Dave Hansen Cc: Masanari Iida , Jonathan Corbet , "linux-kernel\@vger.kernel.org" , linux-mm@kvack.org, lcapitulino@redhat.com Subject: Re: [PATCH] Documentation: vm: Add 1GB large page support information References: <1414771317-5721-1-git-send-email-standby24x7@gmail.com> <5457C6EA.3080809@intel.com> <545A42C4.6070908@intel.com> Date: Wed, 05 Nov 2014 14:58:51 -0800 In-Reply-To: <545A42C4.6070908@intel.com> (Dave Hansen's message of "Wed, 05 Nov 2014 07:31:16 -0800") Message-ID: <871tphtftg.fsf@tassilo.jf.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dave Hansen writes: > On 11/05/2014 07:21 AM, Masanari Iida wrote: >> Luiz, Dave, >> Thanks for comments. >> >> I understand that there are some exception cases which doesn't support 1G >> large pages on newer CPUs. >> I like Dave's example, at the same time I would like to add "pdpe1gb flag" in >> the document. >> >> For example, x86 CPUs normally support 4K and 2M (1G if pdpe1gb flag exist). > > Is 1G supported on CPUs that have pdpe1gb and are running a 32-bit kernel? No, 1GB pages is a 64bit only feature. -Andi -- ak@linux.intel.com -- Speaking for myself only