Re: [Qemu-devel] post-copy is broken?

[Li, Liang Z]

> * Andrea Arcangeli (address@hidden) wrote:
> > On Fri, Apr 15, 2016 at 06:23:30PM +0300, Kirill A. Shutemov wrote:
> > > The same here. Freshly booted machine with 64GiB ram. I've checked
> > > /proc/vmstat: huge pages were allocated
> >
> > I tried the test in a loop and I can't reproduce it here.
> >
> > Tested with gcc 4.9.3 and glibc 2.21 and glibc 2.22 so far,
> > qemu&kernel/KVM latest upstream (4.6-rc3..).
> >
> > You can run this in between each invocation to guarantee all memory is
> > backed by THP (no need of reboot):
> >
> > # echo 3 >/proc/sys/vm/drop_caches
> > # echo >/proc/sys/vm/compact_memory
> >
> > 4.5 kernel built with gcc 5.3.1 run on a older userland worked fine
> > too.
> >
> > Next thing to test would be if there's something wrong with qemu built
> > with gcc 5.3.1 if run on top of a 4.4 kernel?
> 
> It's also working for me on f24 (4.5.0-320 packaged kernel) on a real machine;
> so we currently have two sets that break:
> 
>    a) Liang Li's setup (that breaks with the migrate of a real VM but I don't
>                         think we have any details of the setup);
>                         works with 4.4.x breaks with 4.5.x
> 

The host OS is Centos 7, I just replace the kernel with 4.4/4.5, I can provide 
the .config for the kernel 
if you think it's helpful.
The guest OS is CentOS6.6, 2.6.32-504.el6.x86_64

Liang
>    b) f24 nested with my test, with THP enabled after Kirill's changes.
> 
> Dave
> 
> --
> Dr. David Alan Gilbert / address@hidden / Manchester, UK