Nice summary!
In part 3, you have:
? What does that checkpoint flag do ?
When that flag is set (through xm save -c), the domain resumes
operation after the save operation. Normally "save" destroys the
domain.
You might be interested in my presentation at xen summit 4 about
checkpointing, which goes into some detail about the save/migration
process:
http://xen.org/files/xensummit_4/talk_Cully.pdf
Since then we've increased the speed of checkpointing considerably,
but the code to do it isn't in Xen yet. We have a paper about it in
the next NSDI conference which has the details, if you're interested.
On Wednesday, 27 February 2008 at 14:23, Mike Sun wrote:
> I've had to trace through the migration code and made the following
> notes. Hope it helps:
>
> http://msun.bluespot.org/wiki/doku.php?id=xen_migration_notes
>
> On Wed, Feb 27, 2008 at 4:37 AM, tgh <wwwwww4187@xxxxxxxxxxx> wrote:
> > 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
> > >
> > >
> > >
> > >> clp@xxxxxxxxxxx 写道:
> > >>
> > >>> Vielen Dank für 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 Fällen wenden Sie sich bitte an Herrn Fabio Lüdi, er
> > >>>
> > >> wird Ihnen gerne weiterhelfen.
> > >>
> > >>> Sie erreichen Herrn Lüdi unter:
> > >>> Phone +41 61 6666 406
> > >>> E-Mail fl@xxxxxxxxxxx
> > >>>
> > >
> > >
> >
> >
> >
> >
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> >
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