Re: [Xen-devel] code read problems

[tgh <wwwwww4187@xxxxxxxxxxx>]

hi
 thank you for your reply
 and i read the code of xc_save.c and xc_restore.c, which maybe do the 
function of VMsaving and VMrestoring, but i wander, if the code of 
xc_save.c and xc_restore.c is called by some python code or c code 
during migration or xm save and xm restore or not? the code of xc_save.c 
is a main function ,and is it called by other program to do migration or 
not ?
 and in the code of xc_save.c, there seem no notification to the 
xenstore or devbackend, and how are these VMdevbackends destroyed in the 
dom0, when migration or save?
 and in the code of xc_restore.c,there seems to be an existing 
VMdomain,and the whole data from savefile or from  migration,will load 
into the VMdomain, is itï  then ,what code call these code of xc_save 
and xc_restore?  i am confused
could you help me out

Thanks in advance


Daniel Stodden åé:
> On Tue, 2008-02-26 at 19:22 +0800, tgh wrote:
>   
> > could you reply in english, i could not read your letter
> >     
> Don't bother. Just an autoreply generated to tell you the guy is on
> vacation.
>
> Regarding your problem: There is not much you can do to get some sort
> execution traces enabled automatically. You probably want to enable
> debugging when building Xen and the libraries. Then maybe add a couple
> of debug-print statements to the code, whereever you see fit.
>
> I believe migration support in xend and libxc should be understandable
> in isolation. The tricky parts are definitely done in C. Last time I
> checked, xend mainly performed a single call to the tools and library.
>
> Also note that random instrumentation of all code executed for
> translating and mapping of the domU address space within the hypervisor
> would probably soon get more verbose than you asked for, since some of
> the functions involved can be called at a comparatively high frequency.
>
> Rule 1 when digging your way through complex systems: Divide and
> Conquer. Division comes first. Understand one thing at a time, starting
> at a comparatively high-level, then selectively dig deeper.
>
> regards,
> daniel
>
>
>   
> > clp@xxxxxxxxxxx åé:
> >     
> > > Vielen Dank fÃr Ihre Nachricht. 
> > >
> > > Ich bin vom 22-02-08 bis 07-03-08 nicht im Hause und werde Ihre
> > >       
> > E-Mail ab dem 10-03-07  bearbeiten.
> >     
> > > In dringenden FÃllen wenden Sie sich bitte an Herrn Fabio LÃdi, er
> > >       
> > wird Ihnen gerne weiterhelfen.
> >     
> > > Sie erreichen Herrn LÃdi unter:
> > > Phone +41 61 6666 406
> > > E-Mail fl@xxxxxxxxxxx
> > >       
>   

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