Re: [Qemu-devel] Memory Tracking API
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
[Qemu-devel] Memory Tracking API
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 ? Thanks , Jaspal
Re: [Qemu-devel] Memory Tracking API
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 New in Fedora 11: Fedora Windows cross-compiler. Compile Windows programs, test, and build Windows installers. Over 70 libraries supprt'd http://fedoraproject.org/wiki/MinGW http://www.annexia.org/fedora_mingw
