I see, thank you very much, Eric! Best, Yuanzhen
On Thu, Jul 17, 2014 at 5:26 PM, Eric Blake <ebl...@redhat.com> wrote: > 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 > >
