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Date: Thu, 17 May 2012 19:47:44 +0100
From: "Richard W.M. Jones" <rjones@redhat.com>
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Subject: Re: [Qemu-devel] Memory Tracking API
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To: Jaspal <jaspal.iiith@gmail.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org

On Thu, May 17, 2012 at 11:36:24PM +0530, Jaspal wrote:
> Hi ,
> 
> Is it possible to keep a count of reads / writes taking place in a
> vm using qemu ( using kvm as hypervisor ) ? Is there a api ( or any
> patch ) for it ?

Memory reads and writes is surely going to generate a huge
amount of output!

There are various DEBUG_* symbols at the top of exec.c and ioport.c.
I've only used a few of these:

  DEBUG_UNASSIGNED - prints a message when an unmapped page is
      referenced (TCG only, presumably?)

  DEBUG_IOPORT - prints a message when any I/O port is referenced

  DEBUG_UNUSED_IOPORT - prints a message when a non-emulated I/O port
      is referenced

There are several more if you look at the code.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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