From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 5A2141A01EB for ; Thu, 24 Dec 2015 22:20:18 +1100 (AEDT) Date: Thu, 24 Dec 2015 21:38:44 +1100 From: David Gibson To: Anshuman Khandual Cc: paulus@samba.org, benh@kernel.crashing.org, bharata@linux.vnet.ibm.com, lvivier@redhat.com, thuth@redhat.com, linuxppc-dev@lists.ozlabs.org Subject: Re: [RFC 0/3] Prototype PAPR hash page table resizing (guest side) Message-ID: <20151224103844.GB3011@voom.redhat.com> References: <1450761298-12172-1-git-send-email-david@gibson.dropbear.id.au> <567BB96D.6050504@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="+5G7L20VUoXZHCOn" In-Reply-To: <567BB96D.6050504@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --+5G7L20VUoXZHCOn Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Dec 24, 2015 at 02:52:53PM +0530, Anshuman Khandual wrote: > On 12/22/2015 10:44 AM, David Gibson wrote: > > I've discussed with Paul and Ben previously the possibility of > > extending PAPR to allow changing the size of a running guest's hash > > page table (HPT). This would allow for much more flexible memory > > hotplug, since the HPT wouldn't have to be sized in advance for the > > maximum possible memory size of the guest. >=20 > Does it include reducing the size of HPT as well ? It does, but that could fail with H_PTEG_FULL if there's a collision between bolted entries in the reduced table. --=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 --+5G7L20VUoXZHCOn Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJWe8s0AAoJEGw4ysog2bOS+JcP/AodNGZgUqkyhuY2DqDP7ayM ANREasYPfXTFokSCrzgDdpD71lzYVpcye1nA8FfKuMQRCFKAN9T5vSWAvSUKDKk1 Zg3242FDkj8XBnvkeu1SxqUKoGXJq4dGMB2n0qirrJkRRuCYsKlnU1/ZWGWUZjBw /ZV4nNZReyqfJOx3IZuvTlhB7n6tkOSVUG9wSTBs0NrJy1pd7EGtBt3geXH680lQ WlCEtgrfnaEJ/bj1Ajx0Vt+X/t3nTMX/Nxk/gxsZa9/qhSClg6Db9m6UTJeRRsCw olfrubyorNDkJjWpUB45y4WgWSIPPkM4NYxOzPFyx7xfNGkXmk0H94kn4BV4ZNVm 1EMpp2c7GflpvZmHsNJQXcnzFmFO3yhYVg3uxBDS+JW++k9SSoeJnDPIsjzRX2gp BVz3vZo2atXQ6It09KRIjd90PxxEFrb6VHhmaXooNg4Cf2mf/QAnY0RlQPjuK1n/ t79AhuVy1k9RmdWsUekVLlYLestcK27/ualUHlB8hq4N1H8r0NDHRMBRgTux5p7B SuxDzvE9tMTsJGAUR9IsIjYuzbOB27LCwVAnlaqUJ9Cyo7o9PFYwUjLqinnGBU10 bx+ZnqcQN3iaBbw9gqkYw81CIpcG4qvuwA+xvswwgQ93C5qhRTq/WHT8MuqdULsi q1+Emjv2vti4DpLz8vMW =Yd1F -----END PGP SIGNATURE----- --+5G7L20VUoXZHCOn--