On Wed, Feb 29, 2012 at 12:32:51AM +0100, Alexander Graf wrote:
>
> On 24.02.2012, at 01:23, David Gibson wrote:
>
> > From: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> >
> > If the kernel page size is larger than TARGET_PAGE_SIZE, which
> > happens for example on ppc64 with kernels compiled for 64K pages,
> > the dirty tracking doesn't work.
> >
> > Cc: Avi Kivity <a...@redhat.com>
> > Cc: Marcelo Tossatti <mtossa...@redhat.com>
> >
> > Signed-off-by: Benjamin Herrenschmidt <b...@kernel.crashing.org>
> > Signed-off-by: David Gibson <da...@gibson.dropbear.id.au>
> > ---
> > kvm-all.c | 7 ++++---
> > 1 files changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/kvm-all.c b/kvm-all.c
> > index 5e188bf..3f8cfd9 100644
> > --- a/kvm-all.c
> > +++ b/kvm-all.c
> > @@ -348,10 +348,11 @@ static int kvm_set_migration_log(int enable)
> > static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
> > unsigned long *bitmap)
> > {
> > - unsigned int i, j;
> > + unsigned int i, j;
> > unsigned long page_number, c;
> > target_phys_addr_t addr, addr1;
> > unsigned int len = ((section->size / TARGET_PAGE_SIZE) + HOST_LONG_BITS
> > - 1) / HOST_LONG_BITS;
> > + unsigned long hpratio = getpagesize() / TARGET_PAGE_SIZE;
>
> Actually, looking at this, don't we rather want to cache hpratio?
> The way this is implemented, it would mean we'd do a sysctl for
> every call, right?
I think libc already caches this.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
