On 07/17/2014 02:20 PM, Yuanzhen Gu wrote: > Hi Eric, [please don't top-post on technical lists]
> I enabled libvirt debugging, and saw the log file under > /var/log/libvirt/libvirtd.log, Which debugging filters did you enable? In particular, you'll want to turn on LIBVIRT_LOG_FILTERS="1:qemu" for full libvirt logging of qemu interaction (see http://libvirt.org/logging.html for details); at which point you can then search for QEMU_MONITOR_IO_PROCESS lines to see when libvirt sends commands to QMP and gets replies back. This sort of question may be better asked on the libvirt-us...@redhat.com list. > > for example, I saw > 2014-07-17 20:06:55.992+0000: 4391: debug : qemuProcessHandleResume:575 : > Transitioned guest ubuntu out of paused into resumed state > > my further question is, is there any way to locate the function call for > pause and resume from source code, based on the log info? thanks! Are you looking for where in the libvirt source code a snapshot manages qemu commands? Look for src/qemu/qemu_driver.c:qemuDomainSnapshotCreateActiveExternal, and trace through the code it calls for qemuDomainSnapshotFSFreeze and qemuMonitorTransaction. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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