Re: code read problems

[tgh <wwwwww4187@sina.com.cn>]

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 it？  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 写道:
> 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
>
>
>   
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