在 7/11/2017 9:33 AM, Wang Dong 写道:
On 07/10/2017 01:24 PM, Xie Changlong wrote:
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
yes, I set it. I just did as the docs told. If this does not work or
misses something, it should be corrected I think.
Have you also tried out the examples in docs? how did you do that? I
Yes, just follow the docs. No something special.
think I misses some. Could you tell more about
it? Thanks.
You should confirm the *trace-event*s you set are really triggered by
qemu. Use gdb breakpoint to verify it is a good choice.
--
Thanks
-Xie