Re: qemu tracing

[Alex Bennée]

hgedek <address@hidden> writes:

> hello guys,
>
> I read about qemu - tracing from tutorial and I wish to test it with our 
> system. 
>
> we are using qemu to test our pci devices. and I wish to learn how to 
> activate qemu tracing.
>
> I set:
>
> - configuring and building qemu with --enable-trace-backends=simple
>
> I wish to learn how to see traces or where to check ? because Im calling qemu 
> from inside of my application ( from thread ) so its a thread activated 
> inside.
>
> I followed those steps:
>
> 2. Create a file with the events you want to trace:
>
>    echo memory_region_ops_read >/tmp/events
>
> 3. Run the virtual machine to produce a trace file:
>
>     qemu --trace events=/tmp/events ... # your normal QEMU invocation
>     = passing -trace events=/tmp/events to qemu_main 
>
> 4. Pretty-print the binary trace file:
>
>     ./scripts/simpletrace.py trace-events-all trace-* # Override * with QEMU 
> <pid>
>
> I don't have qemu-pid -
> So any idea ?

The <pid> is the process id of QEMU when it ran. After your run do you
not see some trace-1234 files in your working directory.

-- 
Alex Bennée