From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: David Vrabel <david.vrabel@citrix.com>
Cc: Oliver Chick <oliver.chick@citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Jan Beulich <JBeulich@suse.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [Xen-devel] [PATCH] Persistent grant maps for xen blk drivers
Date: Fri, 21 Sep 2012 13:13:05 -0400 [thread overview]
Message-ID: <20120921171304.GB9201@phenom.dumpdata.com> (raw)
In-Reply-To: <505C9320.8030905@citrix.com>
On Fri, Sep 21, 2012 at 05:17:36PM +0100, David Vrabel wrote:
> On 21/09/12 15:27, Konrad Rzeszutek Wilk wrote:
> > On Fri, Sep 21, 2012 at 01:23:48PM +0100, David Vrabel wrote:
> >>
> >> It's not just virtual space. blkback in pvops kernels allocates its
> >> pages from the balloon and if there aren't enough ballooned out pages it
> >> has to allocate real pages (releasing the MFN back to Xen).
> >>
> >> Classic kernels didn't need to do this as there was an API for allocate
> >> new "empty" struct page's that get mapped into kernel space.
> >
> > Can we ressurect/implement that in the new pvops? We could use the memory
> > hotplug mechanism to allocate "non-existent" memory.
>
> I don't see why not. Provided the limitations are documented I wouldn't
> make merging the persistent grant stuff dependent on it.
I was thinking about this in the future and not delay this [persistent grants].
>
> David
next prev parent reply other threads:[~2012-09-21 17:24 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-19 10:51 [PATCH] Persistent grant maps for xen blk drivers Oliver Chick
2012-09-19 11:17 ` Konrad Rzeszutek Wilk
2012-09-19 11:17 ` Konrad Rzeszutek Wilk
2012-09-19 12:03 ` [Xen-devel] " Jan Beulich
2012-09-20 8:51 ` Oliver Chick
2012-09-20 9:11 ` Jan Beulich
2012-09-20 9:11 ` [Xen-devel] " Jan Beulich
2012-09-20 8:51 ` Oliver Chick
2012-09-19 12:03 ` Jan Beulich
2012-09-19 13:16 ` [Xen-devel] " Pasi Kärkkäinen
2012-09-19 13:16 ` Pasi Kärkkäinen
2012-09-20 9:35 ` Oliver Chick
2012-09-20 9:35 ` [Xen-devel] " Oliver Chick
2012-09-20 10:09 ` Pasi Kärkkäinen
2012-09-20 10:09 ` [Xen-devel] " Pasi Kärkkäinen
2012-09-19 14:11 ` Konrad Rzeszutek Wilk
2012-09-20 13:12 ` Oliver Chick
2012-09-20 13:12 ` Oliver Chick
2012-09-20 13:52 ` Konrad Rzeszutek Wilk
2012-09-20 13:52 ` Konrad Rzeszutek Wilk
2012-09-19 14:11 ` Konrad Rzeszutek Wilk
2012-09-20 10:34 ` [Xen-devel] " David Vrabel
2012-09-20 11:30 ` Oliver Chick
2012-09-20 11:48 ` Jan Beulich
2012-09-20 11:48 ` [Xen-devel] " Jan Beulich
2012-09-20 13:49 ` Konrad Rzeszutek Wilk
2012-09-20 13:49 ` [Xen-devel] " Konrad Rzeszutek Wilk
2012-09-20 14:13 ` Oliver Chick
2012-09-20 16:10 ` Jan Beulich
2012-09-20 16:10 ` [Xen-devel] " Jan Beulich
2012-09-20 21:24 ` Konrad Rzeszutek Wilk
2012-09-20 21:24 ` [Xen-devel] " Konrad Rzeszutek Wilk
2012-09-21 7:18 ` Jan Beulich
2012-09-21 7:18 ` [Xen-devel] " Jan Beulich
2012-09-21 8:41 ` Oliver Chick
2012-09-21 8:41 ` [Xen-devel] " Oliver Chick
2012-09-21 9:41 ` Jan Beulich
2012-09-21 9:41 ` [Xen-devel] " Jan Beulich
2012-09-21 8:10 ` Ian Campbell
2012-09-21 14:26 ` Konrad Rzeszutek Wilk
2012-09-21 14:26 ` Konrad Rzeszutek Wilk
2012-09-21 8:10 ` Ian Campbell
2012-09-20 14:13 ` Oliver Chick
2012-09-20 15:35 ` [Xen-devel] " Jan Beulich
2012-09-20 15:35 ` Jan Beulich
2012-09-21 12:23 ` David Vrabel
2012-09-21 12:23 ` [Xen-devel] " David Vrabel
2012-09-21 14:27 ` Konrad Rzeszutek Wilk
2012-09-21 14:27 ` [Xen-devel] " Konrad Rzeszutek Wilk
2012-09-21 16:17 ` David Vrabel
2012-09-21 17:13 ` Konrad Rzeszutek Wilk
2012-09-21 17:13 ` Konrad Rzeszutek Wilk [this message]
2012-09-21 16:17 ` David Vrabel
2012-09-20 11:30 ` Oliver Chick
2012-09-20 10:34 ` David Vrabel
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