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Date: Thu, 22 Jan 2009 14:36:08 -0800 From: Jeremy Fitzhardinge <jeremy@...p.org> To: Ingo Molnar <mingo@...e.hu> CC: "dan.magenheimer@...cle.com" <dan.magenheimer@...cle.com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Xen-devel <xen-devel@...ts.xensource.com>, Stable Kernel <stable@...nel.org> Subject: [PATCH] xen: actually release memory when shrinking domain From: Dan Magenheimer <dan.magenheimer@...cle.com> 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@...cle.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com> --- drivers/xen/balloon.c | 5 +++++ 1 file changed, 5 insertions(+) =================================================================== --- linux-2.6.28/drivers/xen/balloon.c.orig +++ linux-2.6.28/drivers/xen/balloon.c @@ -296,6 +296,11 @@ 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. */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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