Re: [Qemu-devel] About the trace framework

[Xie Changlong]

在 7/9/2017 5:57 PM, Wang Dong 写道:
> Hi,
>
> I am new to QEMU. But I got some problem so that  I want to figure it out.
>
> So I try to debug qemu to see what happened.
>
> And I found trace framework. I think this will help me understand the 
> point.
>
> So I compiled qemu with option:
>
> ## *--enable-trace-backends=simple*
>
> And did as the docs/tracing.txt tell. But when I execute the example 
> command in it, nothing just happens.
>
> *./scripts/simpletrace.py trace-events-all trace-xxxxxx(my trace file 
> produced by qemu)
> I am not sure what happened. Just ask this.
> Any clue will be appreciated. Thanks in advance.
> *

Did you set *trace-event*? I've encountered this issue in the past :)
(qemu) help trace-event
trace-event name on|off -- changes status of a specific trace event
(qemu) info trace-events

--
Thanks
    -Xie