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| author | Dan Magenheimer <dan.magenheimer@oracle.com> | 2009-01-22 23:36:08 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-01-22 23:41:44 +0100 |
| commit | 1058a75f07b9bb8323fb5197be5526220f8b75cf (patch) | |
| tree | 3dcdc077c2c045043629b1999a40f8e1f13996d5 /drivers/xen/balloon.c | |
| parent | x86: unmask CPUID levels on Intel CPUs (diff) | |
| download | linux-1058a75f07b9bb8323fb5197be5526220f8b75cf.tar.xz linux-1058a75f07b9bb8323fb5197be5526220f8b75cf.zip | |
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: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/xen/balloon.c')
| -rw-r--r-- | drivers/xen/balloon.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 8dc7109d61b7..8069d520c460 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -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. */ |