From: David Gibson <david@gibson.dropbear.id.au>
To: Anshuman Khandual <khandual@linux.vnet.ibm.com>
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)
Date: Thu, 24 Dec 2015 21:38:44 +1100 [thread overview]
Message-ID: <20151224103844.GB3011@voom.redhat.com> (raw)
In-Reply-To: <567BB96D.6050504@linux.vnet.ibm.com>
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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.
>
> 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.
--
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
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next prev parent reply other threads:[~2015-12-24 11:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-22 5:14 [RFC 0/3] Prototype PAPR hash page table resizing (guest side) David Gibson
2015-12-22 5:14 ` [RFC 1/3] pseries: Add hypercall wrappers for hash page table resizing David Gibson
2015-12-22 5:14 ` [RFC 2/3] pseries: Add support for hash " David Gibson
2015-12-22 5:14 ` [RFC 3/3] pseries: sysfs hack to trigger a hash page table resize David Gibson
2015-12-22 11:19 ` Denis Kirjanov
2015-12-23 8:45 ` David Gibson
2015-12-23 12:16 ` Denis Kirjanov
2015-12-24 6:37 ` David Gibson
2015-12-24 9:22 ` [RFC 0/3] Prototype PAPR hash page table resizing (guest side) Anshuman Khandual
2015-12-24 10:38 ` David Gibson [this message]
2015-12-28 4:39 ` Anshuman Khandual
2015-12-29 4:09 ` David Gibson
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