Re: 2.6.32 pv_ops and sparse/flat memory

[Vasiliy G Tolstov <v.tolstov@selfip.ru>]

On Tue, 2010-11-23 at 19:06 +0100, Daniel Kiper wrote:
> Hello,
> 
> On Mon, Nov 22, 2010 at 01:22:30PM +0300, Vasiliy G Tolstov wrote:
> > On Mon, 2010-11-22 at 11:09 +0100, Daniel Kiper wrote:
> > > Hello,
> > >
> > > On Fri, Nov 19, 2010 at 04:44:17PM +0300, Vasiliy G Tolstov wrote:
> > > > Hello. I'm try to compile 32 bit pae kernel from xen git repo. If i
> > > > check sparse memory - i get error
> > >
> > > Please send me full address of Xen repository which you are using
> > > its head
> >
> > git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen
> > git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x
> >
> > > and contents of your config file.
> > in attach, modify flat memory to sparse mem and compile under i686 arch
> 
> As I find out it is normal behavior when CONFIG_XEN is enabled in this
> kernel version. Unlike mainline kernel this version establish new PG_foreign
> page flag which with CONFIG_SPARSEMEM_MANUAL and CONFIG_HIGHMEM64G
> enabled overflow page flags field which is - surprise - 32-bit long in
> i386 (for more details read include/linux/page-flags.h file).
> 
> Solution:
>   - enable CONFIG_HIGHMEM4G,
>   - disable CONFIG_XEN (I am not sure that it
>     is good one for you :-))) ).
> 
> Daniel

Thank You Daniel! But i need to able to run vm with 56Gb memory size and
highmem 4g not usable =). My question is - can i use memory about 56Gb
and use memory hotplug, what you write?  (using flat memory config)