From: Avi Kivity <avi@redhat.com>
To: David Evensky <evensky@dancer.ca.sandia.gov>
Cc: kvm@vger.kernel.org
Subject: Re: memory zones and the KVM guest kernel
Date: Tue, 24 May 2011 11:04:05 +0300 [thread overview]
Message-ID: <4DDB6675.6070002@redhat.com> (raw)
In-Reply-To: <20110523201956.GG7835@dancer.ca.sandia.gov>
On 05/23/2011 11:19 PM, David Evensky wrote:
> Hi,
>
> When I boot my guest kernel with KVM, the dmesg output says that:
>
> ...
> [ 0.000000] Zone PFN ranges:
> [ 0.000000] DMA 0x00000010 -> 0x00001000
> [ 0.000000] DMA32 0x00001000 -> 0x00100000
> [ 0.000000] Normal empty
> [ 0.000000] Movable zone start PFN for each node
> [ 0.000000] early_node_map[2] active PFN ranges
> [ 0.000000] 0: 0x00000010 -> 0x0000009f
> [ 0.000000] 0: 0x00000100 -> 0x0007fffd
> ...
>
> Why is the Normal Zone empty?
The DMA32 zone covers the first 4GB of memory. If you have less than
that (actually less than somewhat less than 4GB), nothing spills over to
the normal zone.
> Is it possible to have some of the
> guest's memory mapped in the Normal zone?
-m 8G
> Is there a good reference that talks about the normal, movable,
> etc. memory zones?
I expect Mel Gorman's book covers it.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
prev parent reply other threads:[~2011-05-24 8:04 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-23 20:19 memory zones and the KVM guest kernel David Evensky
2011-05-24 8:04 ` Avi Kivity [this message]
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