Re: [PATCH unit-tests] Add async page fault test

[Avi Kivity <avi@redhat.com>]

On 05/09/2012 11:41 AM, Gleb Natapov wrote:
> > 
> > >  void vfree(void *mem)
> > >  {
> > >      unsigned long size = ((unsigned long *)mem)[-1];
> > > diff --git a/lib/x86/vm.h b/lib/x86/vm.h
> > > index 71ab4a8..ff4842f 100644
> > > --- a/lib/x86/vm.h
> > > +++ b/lib/x86/vm.h
> > > @@ -22,6 +22,7 @@ void vfree(void *mem);
> > >  void *vmap(unsigned long long phys, unsigned long size);
> > >  void *alloc_vpage(void);
> > >  void *alloc_vpages(ulong nr);
> > > +unsigned long virt_to_phys_cr3(void *mem);
> > 
> > uint64_t.
> virt_to_phys() also unsigned long. And get_pte() that virt_to_phys_cr3()
> uses also. I guess the code is not ready for more then 2^32 memory in
> 32bit VM.

It's certainly not enterprise quality yet.  But let's not add more problems.

> > Alterative ways of doing this:
> > - file-backed memory using FUSE to control paging
> Not sure how that can be done.
>
> > - add madvise(MADV_DONTNEED) support to testdev, and have the guest
> > trigger page-in itself.
> MADV_DONTNEED will drop page, not swap it out.

Right, but it will be have to be reloaded from disk (it has to be
file-backed for this to work).  If it's dirty, sync it first.

-- 
error compiling committee.c: too many arguments to function