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 (4):
  xen/mm: remove aliasing of PGC_need_scrub over PGC_allocated
  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/arch/arm/include/asm/mm.h     |  10 +--
 xen/arch/ppc/include/asm/mm.h     |  10 +--
 xen/arch/riscv/include/asm/mm.h   |  10 +--
 xen/arch/x86/include/asm/mm.h     |  18 ++---
 xen/common/domain.c               |  24 +++++++
 xen/common/memory.c               | 108 ++++++++++++++++++++++++++++--
 xen/common/page_alloc.c           |  32 +++++++--
 xen/include/xen/mm.h              |  14 ++++
 xen/include/xen/sched.h           |   5 ++
 10 files changed, 202 insertions(+), 42 deletions(-)

-- 
2.51.0