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Commit 1058a75f authored by Dan Magenheimer's avatar Dan Magenheimer Committed by Ingo Molnar
Browse files

xen: actually release memory when shrinking domain 



Fix this:

> It appears that in the upstream balloon driver,
> the call to HYPERVISOR_update_va_mapping is missing
> from decrease_reservation.  I think as a result,
> the balloon driver is eating memory but not
> releasing it to Xen, thus rendering the balloon
> driver essentially useless.  (Can be observed via xentop.)

Signed-off-by: default avatarDan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: default avatarJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 066941bd

drivers/xen/balloon.c

+5 −0
Original line number Diff line number Diff line
@@ -298,6 +298,11 @@ static int decrease_reservation(unsigned long nr_pages) 
		frame_list[i] = pfn_to_mfn(pfn);



		scrub_page(page);



		ret = HYPERVISOR_update_va_mapping(

			(unsigned long)__va(pfn << PAGE_SHIFT),

			__pte_ma(0), 0);

		BUG_ON(ret);

	}



	/* Ensure that ballooned highmem pages don't have kmaps. */