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Re: [Qemu-devel] qemu-2.2 using trace event
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] qemu-2.2 using trace event |
Date: |
Thu, 29 Oct 2015 16:40:12 +0000 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Wed, Oct 28, 2015 at 08:44:27PM +0800, 浩樊啊 wrote:
> Hi,here is my problem
> 1 ./configure --enable-trace-backends=simple
> make
> make install
> echo virtio_notity > /tmp/events
> echo virtio_queue_notify >> /tmp/events
> 2 I use a xml file run a virtual machine
> 3 qemu-system_x86_64 -trace events=/tmp/events
Here is my command-line:
qemu-system-x86_64 -enable-kvm -m 1024 \
-drive if=virtio,file=test.img,format=raw \
-trace events=/tmp/events
Can you post your full command-line?
> 4 ./scripts/simpletrace.py trace-events trace-*
After shutting down QEMU I ran:
$ scripts/simpletrace.py trace-events trace-16347
...
virtio_notify 89.954 pid=16347 vdev=0x5628b0b5db30 vq=0x5628b1f8f650
virtio_queue_notify 77.129 pid=16347 vdev=0x5628b0b5db30 n=0x0
vq=0x5628b1f8f650
virtio_notify 171.445 pid=16347 vdev=0x5628b0b5db30 vq=0x5628b1f8f650
virtio_queue_notify 65.987 pid=16347 vdev=0x5628b0b5db30 n=0x0
vq=0x5628b1f8f650
virtio_notify 168.007 pid=16347 vdev=0x5628b0b5db30 vq=0x5628b1f8f650
...
> But do not get trace.log. and when i check trace-* using 'vim' i find the
> file is almost empty.
> I tried many times, including reinstall qemu,but still don't work.
The file is called trace-$QEMU_PID, not trace.log.
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