On 05/18/2012 12:17 AM, Richard W.M. Jones wrote:
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.
When are these functions called : kvm_read_guest_page ,
kvm_read_guest_atomic , kvm_write_guest_page present in kvm_main.c ?
When qemu wants to read/write to a page ? If qemu has to read/write on
the vm's memory ( RAM ) , does the process always involve kvm ?
Thanks ,
Jaspal
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