Re: [Qemu-devel] Re: Performance Monitoring

[Glauber Costa]

On Wed, May 21, 2008 at 1:10 PM, Charles Duffy
<address@hidden> wrote:
> Cheif Jones wrote:
>>
>> I'm doing a research project in which i want to run an OS under an
>> emulator for a period of time and get full CPU opcode statistics (how many
>> times every opcode was executed). As far as i understand the Qemu design, it
>> is doing "JIT" translation of terget opcode to host opcodes to improve
>> performance, and so there is no easy way to count target opcodes (e.g a loop
>> is compiled JIT and runs natively).
>
> Is an actual emulator necessary, or could you use something like an
> instrumented UML kernel? I'd think that would be a much simpler approach.

Since he claims to need opcode statistics, and UML won't trap any
instruction but the privileged ones, does not seem feasible.

-- 
Glauber Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."