On 08.01.2026 18:55, Roger Pau Monne wrote: > In XenServer we have seen the watchdog occasionally triggering during > domain creation if 1GB pages are scrubbed in-place during physmap > population.
That's pretty extreme - writing to 1Gb of memory can't really take over 5s, can it? Is there lock contention involved? Or is this when very many CPUs try to do the same in parallel? Jan > 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(-) >
