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xen-devel
Re: [Xen-devel] migrateDevices( ) ?
hi
Thank you for your explanation
and when xen processes " live migration",xend will fork a process to do
xc_linux_save,and also call the helphandler which will call
migrateDevices() in three steps,that is ,migrateDevices() will copy the
devices' state to the destination when the iterative pre-copying of the
VM memory state is completed ,is it? or what is the tricks behind? i
read DevController.py,but still not clear,
and i am confused about which code is called in the destination node to
cooperate with for migration, that is ,on the destination node ,which
code will invoke the receiving function there? is it httpserver? then
,which function code will it call to receive ,or what to do ?i guess
some functions will be called to deal with something ,then call the
restore function or something, but which function is called before the
restore function is called ? i am lost in it
Thanks in advance
Stefan Berger 写道:
xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 01/02/2008 01:41:56 AM:
> hi
> I read the code of migration,and i am confused about the function of
> migrateDevices(), it is called for 3times,and what is the function for
> it ? could someone help me out
The purpose of this function is to enable the migration of 'external
devices', i.e. this would be disk images or TPM state, from one
physical machine to another while migrating a vm.
The prototype of the migrate function explains the different steps.
http://xenbits.xensource.com/xen-unstable.hg?file/2491691e3e69/tools/python/xen/xend/server/DevController.py
Stefan
>
> Thanks in advance
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
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