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[PATCH v4 0/3] xen/mm: limit in-place scrubbing
- To: xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Date: Wed, 28 Jan 2026 13:03:36 +0100
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- Cc: Roger Pau Monne <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>
- Delivery-date: Wed, 28 Jan 2026 12:03:53 +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 adding
preemption to page scrubbing in populate_physmap(). Also a new limit
and command line option to signal the maximum allocation order when
doing in-place scrubbing. This is set by default to
CONFIG_PTDOM_MAX_ORDER.
Thanks, Roger.
Roger Pau Monne (3):
xen/mm: enforce SCRUB_DEBUG checks for MEMF_no_scrub allocations
xen/mm: allow deferred scrub of physmap populate allocated pages
xen/mm: limit non-scrubbed allocations to a specific order
docs/misc/xen-command-line.pandoc | 13 ++++
xen/common/domain.c | 30 +++++++++
xen/common/memory.c | 104 ++++++++++++++++++++++++++++--
xen/common/page_alloc.c | 30 +++++++--
xen/include/xen/mm.h | 14 ++++
xen/include/xen/sched.h | 5 ++
6 files changed, 187 insertions(+), 9 deletions(-)
--
2.51.0
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