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Date: Sun, 8 Nov 2009 23:27:44 +0000
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] [RFC] virtio: Report new guest memory statistics
	pertinent to memory ballooning
Message-ID: <20091108232744.GA5275@shareable.org>
References: <1257461425.3121.22.camel@aglitke> <4AF6891D.3080308@redhat.com>
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To: Avi Kivity <avi@redhat.com>
Cc: aliguori@us.ibm.com, qemu-devel@nongnu.org, Adam Litke <agl@us.ibm.com>

Avi Kivity wrote:
> >     	(qemu) info balloon
> >     	balloon: actual=1024 MB
> >     	balloon: pswapin=0 pages
> >     	balloon: pswapout=0 pages
> >     	balloon: panon=3928 KB
> >     	balloon: pgmajfault=0
> >     	balloon: pgminfault=247914
> >     	balloon: memfree=987032 KB
> >     	balloon: memtot=1020812 KB
> 
> It's important that these statistics be cross platform.  Can you (or 
> someone knowledgeable in Windows) verify that all of these are 
> meaningful there?  I'd expect it to be so with the possible exception of 
> panon.

pswapin, pswapout, pgmajfault and pgminfault are not meaningful even
on some Linux targets (those without MMU, and therefore no page
faults).  Yet even those could, perhaps, use virtio-balloon.

It's probably best to have a way to omit values that are not
meaningful to a guest, or otherwise indicate "not defined by the
current guest".

-- Jamie