From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755556Ab2JVQ7n (ORCPT ); Mon, 22 Oct 2012 12:59:43 -0400 Received: from mga01.intel.com ([192.55.52.88]:10960 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755416Ab2JVQ7m (ORCPT ); Mon, 22 Oct 2012 12:59:42 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.80,630,1344236400"; d="scan'208";a="236863360" Date: Mon, 22 Oct 2012 09:29:29 -0700 From: Andi Kleen To: "Michael Kerrisk (man-pages)" Cc: Andi Kleen , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hillf Danton Subject: Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM_HUGETLB v6 Message-ID: <20121022162929.GN2095@tassilo.jf.intel.com> References: <1350665289-7288-1-git-send-email-andi@firstfloor.org> <20121022132733.GQ16230@one.firstfloor.org> <20121022133534.GR16230@one.firstfloor.org> <20121022153633.GK2095@tassilo.jf.intel.com> <20121022161151.GS16230@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Since PowerPC already allows 16GB page sizes, doesn't there need to be > allowance for the possibility of future expansion? Choosing a larger > minimum size (like 2^16) would allow that. Does the minimum size need > to be 16k? (Surely, if you want a HUGEPAGE, you want a bigger page > than that? I am not sure.) Some architectures have configurable huge page sizes, so it depends on the user. I thought 16K is reasonable. Can make it larger too. But I personally consider even 16GB pages somewhat too big. -Andi -- ak@linux.intel.com -- Speaking for myself only From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx120.postini.com [74.125.245.120]) by kanga.kvack.org (Postfix) with SMTP id 1E7BE6B006E for ; Mon, 22 Oct 2012 12:29:30 -0400 (EDT) Date: Mon, 22 Oct 2012 09:29:29 -0700 From: Andi Kleen Subject: Re: [PATCH] MM: Support more pagesizes for MAP_HUGETLB/SHM_HUGETLB v6 Message-ID: <20121022162929.GN2095@tassilo.jf.intel.com> References: <1350665289-7288-1-git-send-email-andi@firstfloor.org> <20121022132733.GQ16230@one.firstfloor.org> <20121022133534.GR16230@one.firstfloor.org> <20121022153633.GK2095@tassilo.jf.intel.com> <20121022161151.GS16230@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: "Michael Kerrisk (man-pages)" Cc: Andi Kleen , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hillf Danton > Since PowerPC already allows 16GB page sizes, doesn't there need to be > allowance for the possibility of future expansion? Choosing a larger > minimum size (like 2^16) would allow that. Does the minimum size need > to be 16k? (Surely, if you want a HUGEPAGE, you want a bigger page > than that? I am not sure.) Some architectures have configurable huge page sizes, so it depends on the user. I thought 16K is reasonable. Can make it larger too. But I personally consider even 16GB pages somewhat too big. -Andi -- ak@linux.intel.com -- Speaking for myself only -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org