From: Ian Campbell <ian.campbell@citrix.com>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Julien Grall <julien.grall@citrix.com>,
xen-devel@lists.xenproject.org
Cc: Wei.Liu2@citrix.com,
Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Tim Deegan <tim@xen.org>, Ian Jackson <ian.jackson@eu.citrix.com>,
stefano.stabellini@citrix.com, Jan Beulich <jbeulich@suse.com>,
Keir Fraser <keir@xen.org>
Subject: Re: [RFC 1/2] xen/mm: Clarify the granularity for each Frame Number
Date: Wed, 5 Aug 2015 12:51:18 +0100 [thread overview]
Message-ID: <1438775478.9747.72.camel@citrix.com> (raw)
In-Reply-To: <55C1F617.8090208@citrix.com>
On Wed, 2015-08-05 at 12:40 +0100, Andrew Cooper wrote:
>
> 64K granularity is also similar to 2M/1G superpages in their handling,
> the difference being that 64K can't be subdivided if necessary?
64K is actually a separate basic "granule" (to use the ARM term), i.e.
alternative to the 4K leaf page size, you can still have e.g. 32M super
pages pages if them etc (assuming there are still 512 PTEs per page, I
didn't actually check).
So I think thinking of 64K as a "superpage" while superficially correct
would probably lead to some misunderstanding or confusion at some point.
FWIW there is also a 16K granule available on ARM systems. PPC supports
256K pages too...
Ian
next prev parent reply other threads:[~2015-08-05 11:51 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-05 11:28 [RFC 0/2] xen: Clarify the page granularity for the hypercall Julien Grall
2015-08-05 11:28 ` [RFC 1/2] xen/mm: Clarify the granularity for each Frame Number Julien Grall
2015-08-05 11:40 ` Andrew Cooper
2015-08-05 11:51 ` Ian Campbell [this message]
2015-08-05 12:36 ` Julien Grall
2015-08-05 12:46 ` Andrew Cooper
2015-08-05 13:18 ` Julien Grall
2015-08-12 7:16 ` Jan Beulich
2015-08-12 9:57 ` Julien Grall
2015-08-12 10:33 ` Jan Beulich
2015-08-12 11:13 ` Julien Grall
2015-08-12 11:58 ` Jan Beulich
2015-08-12 12:57 ` Julien Grall
2015-08-12 13:25 ` Jan Beulich
2015-08-05 11:28 ` [RFC 2/2] xen/public: grant-table: Specificy the size of the grant Julien Grall
2015-08-05 16:51 ` Stefano Stabellini
2015-08-12 7:21 ` Jan Beulich
2015-08-12 10:00 ` Julien Grall
2015-08-12 10:35 ` Jan Beulich
2015-08-12 11:08 ` Julien Grall
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