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[PATCH 0/2] xen/mm: limit in-place scrubbing
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Thu, 8 Jan 2026 18:55:34 +0100
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Thu, 08 Jan 2026 17:56:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
In XenServer we have seen the watchdog occasionally triggering during
domain creation if 1GB pages are scrubbed in-place during physmap
population. The following series attempt to mitigate this by limiting
the in-place scrubbing during allocation to 2M pages, but it has some
drawbacks, see the post-commit remarks in patch 2.
I'm hopping someone might have a better idea, or we converge we can't do
better than this for the time being.
Thanks, Roger.
Roger Pau Monne (2):
xen/mm: add a NUMA node parameter to scrub_free_pages()
xen/mm: limit non-scrubbed allocations to a specific order
xen/arch/arm/domain.c | 2 +-
xen/arch/x86/domain.c | 2 +-
xen/common/memory.c | 12 +++++++++
xen/common/page_alloc.c | 54 +++++++++++++++++++++++++++++++++++++----
xen/include/xen/mm.h | 12 ++++++++-
5 files changed, 74 insertions(+), 8 deletions(-)
--
2.51.0
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