On Tue, Sep 25, 2012 at 03:05:49AM +0200, Michael S. Tsirkin wrote:
> If these are all under page lock these barriers just confuse things,
> because they are almost never enough by themselves.
> So in that case it would be better to drop them and document
> usage as you are going to.
>
Would the f
On Tue, Sep 18, 2012 at 01:24:21PM -0300, Rafael Aquini wrote:
> > > +static inline void assign_balloon_mapping(struct page *page,
> > > + struct address_space *mapping)
> > > +{
> > > + page->mapping = mapping;
> > > + smp_wmb();
> > > +}
> > > +
> > > +static inl
On Mon, 2012-09-17 at 13:38 -0300, Rafael Aquini wrote:
> +static inline void assign_balloon_mapping(struct page *page,
> + struct address_space
> *mapping)
> +{
> + page->mapping = mapping;
> + smp_wmb();
> +}
> +
> +static inline void clear_ball
On Tue, 18 Sep 2012 13:24:21 -0300
Rafael Aquini wrote:
> On Mon, Sep 17, 2012 at 03:15:43PM -0700, Andrew Morton wrote:
> > > +/* return code to identify when a ballooned page has been migrated */
> > > +#define BALLOON_MIGRATION_RETURN 0xba1100
> >
> > I didn't really spend enough time to work
On Mon, Sep 17, 2012 at 03:15:43PM -0700, Andrew Morton wrote:
> > +/* return code to identify when a ballooned page has been migrated */
> > +#define BALLOON_MIGRATION_RETURN 0xba1100
>
> I didn't really spend enough time to work out why this was done this
> way, but I know a hack when I see on
On Mon, 17 Sep 2012 13:38:16 -0300
Rafael Aquini wrote:
> Memory fragmentation introduced by ballooning might reduce significantly
> the number of 2MB contiguous memory blocks that can be used within a guest,
> thus imposing performance penalties associated with the reduced number of
> transparen
Memory fragmentation introduced by ballooning might reduce significantly
the number of 2MB contiguous memory blocks that can be used within a guest,
thus imposing performance penalties associated with the reduced number of
transparent huge pages that could be used by the guest workload.
This patch
