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文件: /usr/share/doc/qemu-kvm/README.systemtap
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QEMU tracing using systemtap-initscript --------------------------------------- You can capture QEMU trace data all the time using systemtap-initscript. This uses SystemTap's flight recorder mode to trace all running guests to a fixed-size buffer on the host. Old trace entries are overwritten by new entries when the buffer size wraps. 1. Install the systemtap-initscript package: # yum install systemtap-initscript 2. Install the systemtap scripts and the conf file: # cp /usr/share/qemu-kvm/systemtap/script.d/qemu_kvm.stp /etc/systemtap/script.d/ # cp /usr/share/qemu-kvm/systemtap/conf.d/qemu_kvm.conf /etc/systemtap/conf.d/ The set of trace events to enable is given in qemu_kvm.stp. This SystemTap script can be customized to add or remove trace events provided in /usr/share/systemtap/tapset/qemu-kvm-simpletrace.stp. SystemTap customizations can be made to qemu_kvm.conf to control the flight recorder buffer size and whether to store traces in memory only or disk too. See stap(1) for option documentation. 3. Start the systemtap service. # service systemtap start qemu_kvm 4. Make the service start at boot time. # chkconfig systemtap on 5. Confirm that the service works. # service systemtap status qemu_kvm qemu_kvm is running... When you want to inspect the trace buffer, perform the following steps: 1. Dump the trace buffer. # staprun -A qemu_kvm >/tmp/trace.log 2. Start the systemtap service because the preceding step stops the service. # service systemtap start qemu_kvm 3. Translate the trace record to readable format. # /usr/share/qemu-kvm/simpletrace.py --no-header /usr/share/qemu-kvm/trace-events /tmp/trace.log
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