Re: [Qemu-devel] [TCG only][Migration Bug? ] Occasionally, the content of VM's memory is inconsistent between Source and Destination of migration

[Amit Shah <amit.shah@redhat.com>]

On (Fri) 04 Dec 2015 [01:43:07], Li, Liang Z wrote:
> > 
> > Thanks for describing how to reproduce the bug.
> > If some pages are not transferred to destination then it is a bug, so we need
> > to know what the problem is, notice that the problem can be that TCG is not
> > marking dirty some page, that Migration code "forgets" about that page, or
> > anything eles altogether, that is what we need to find.
> > 
> > There are more posibilities, I am not sure that memtest is on 32bit mode, and
> > it is inside posibility that we are missing some state when we are on real
> > mode.
> > 
> > Will try to take a look at this.
> > 
> > THanks, again.
> > 
> 
> Hi Juan & Amit
> 
>  Do you think we should add a mechanism to check the data integrity during LM like Zhijian's patch did?  it may be very helpful for developers. 
>  Actually, I did the similar thing before in order to make sure that I did the right thing we I change the code related to LM.

If you mean for debugging, something that's not always on, then I'm
fine with it.

A script that goes along that shows the result of comparison of the
diff will be helpful too, something that shows how many pages are
differnt, how many bytes in a page on average, and so on.

		Amit