From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx132.postini.com [74.125.245.132]) by kanga.kvack.org (Postfix) with SMTP id 68ECD6B00AB for ; Mon, 29 Apr 2013 22:22:11 -0400 (EDT) Received: from /spool/local by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 30 Apr 2013 12:12:42 +1000 Received: from d23relay05.au.ibm.com (d23relay05.au.ibm.com [9.190.235.152]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id 26E6B2CE804D for ; Tue, 30 Apr 2013 12:22:04 +1000 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay05.au.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r3U28CeZ23986272 for ; Tue, 30 Apr 2013 12:08:13 +1000 Received: from d23av01.au.ibm.com (loopback [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r3U2M2Cb016865 for ; Tue, 30 Apr 2013 12:22:02 +1000 Date: Tue, 30 Apr 2013 12:21:49 +1000 From: David Gibson Subject: Re: [PATCH -V7 01/18] mm/THP: HPAGE_SHIFT is not a #define on some arch Message-ID: <20130430022149.GU20202@truffula.fritz.box> References: <1367177859-7893-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> <1367177859-7893-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Sh7h4lnU5nPTsIof" Content-Disposition: inline In-Reply-To: <1367177859-7893-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: "Aneesh Kumar K.V" Cc: benh@kernel.crashing.org, paulus@samba.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org --Sh7h4lnU5nPTsIof Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 29, 2013 at 01:07:22AM +0530, Aneesh Kumar K.V wrote: > From: "Aneesh Kumar K.V" >=20 > On archs like powerpc that support different hugepage sizes, HPAGE_SHIFT > and other derived values like HPAGE_PMD_ORDER are not constants. So move > that to hugepage_init These seems to miss the point. Those variables may be defined in terms of HPAGE_SHIFT right now, but that is of itself kind of broken. The transparent hugepage mechanism only works if the hugepage size is equal to the PMD size - and PMD_SHIFT remains a compile time constant. There's no reason having transparent hugepage should force the PMD size of hugepage to be the default for other purposes - it should be possible to do THP as long as PMD-sized is a possible hugepage size. --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson --Sh7h4lnU5nPTsIof Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAlF/Kr0ACgkQaILKxv3ab8YK6ACePQzw/9X5H+l8PCCPLjXKGkKa pYoAn2p0muo2mU8ZvptskameU9fEeUY/ =f8lO -----END PGP SIGNATURE----- --Sh7h4lnU5nPTsIof-- -- 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