From: Ian Campbell <Ian.Campbell@citrix.com>
To: Wei Liu <wei.liu2@citrix.com>
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>,
Andrew Cooper <andrew.cooper3@citrix.com>,
xen-devel@lists.xen.org, David Vrabel <david.vrabel@citrix.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: Xen balloon driver improvement (version 1)
Date: Thu, 23 Oct 2014 12:00:40 +0100 [thread overview]
Message-ID: <1414062040.19198.38.camel@citrix.com> (raw)
In-Reply-To: <20141022182929.GA29147@zion.uk.xensource.com>
On Wed, 2014-10-22 at 19:29 +0100, Wei Liu wrote:
> > > For instance, balloon driver can maintain three queues:
> > >
> > > 1. queue for 2 MB pages
> > > 1. queue for 4 KB pages (delegated to core balloon driver)
> > > 1. queue for pages used to mapped pages from other domain
> >
> > What about 1GB pages?
> >
>
> I wouldn't bother with 1GB pages here.
Guests which don't have special privileges are limited to 2M contiguous
allocations anyway, to stop them from consuming "precious" higher order
mappings.
I'm not sure that's still worthwhile (e.g. is it valid on ARM or
shadow/HAP x86? I'm not sure).
> It would require too much work to coalesce 4KB pages to 1GB pages.
FWIW in practice You'd probably coalesce 4K pages into 2M and then 2M
into 1G.
next prev parent reply other threads:[~2014-10-23 11:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-22 16:29 Xen balloon driver improvement (version 1) Wei Liu
2014-10-22 17:32 ` Andrew Cooper
2014-10-22 18:29 ` Wei Liu
2014-10-23 11:00 ` Ian Campbell [this message]
2014-10-23 11:05 ` Wei Liu
2014-10-23 11:42 ` Andrew Cooper
2014-10-23 11:44 ` David Vrabel
2014-10-23 10:09 ` David Vrabel
2014-10-23 10:52 ` Stefano Stabellini
2014-10-23 10:58 ` David Vrabel
2014-10-23 11:04 ` Wei Liu
2014-10-27 11:29 ` Wei Liu
2014-10-23 11:59 ` Ian Campbell
2014-10-23 12:17 ` Wei Liu
2014-10-23 12:27 ` Ian Campbell
2014-10-23 13:00 ` Wei Liu
2014-10-23 14:29 ` Ian Campbell
2014-10-23 14:30 ` Roger Pau Monné
2014-10-23 15:23 ` Wei Liu
2014-10-23 15:57 ` Roger Pau Monné
2014-10-23 16:04 ` Ian Campbell
2014-10-23 16:12 ` Wei Liu
2014-10-24 13:54 ` Dario Faggioli
2014-10-24 14:04 ` Wei Liu
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