[PATCH v6 00/71] Introducing the Maple Tree

[Hugh Dickins]

On Sat, 26 Feb 2022, Hugh Dickins wrote:
> 
> I say "often": it's very erratic.  Once, a machine booted with mem=1G
> ran kernel builds successfully swapping for 4.5 hours before faulting
> in __nr_to_section in virt_to_folio ... while doing a __vma_adjust() -
> you'll ask me for a full stacktrace, and I'll answer sorry, too many,
> please try for yourself.  Another time, for 1.5 hours before hitting
> the BUG_ON(is_migration_entry(entry) && !PageLocked(p)) in
> pfn_swap_entry_to_page() - suggesting anon_vma locking had not been
> right while doing page migration (I was exercising THPs a lot).
> But now, can I even get it to complete the boot sequence?

Sorry, I never mentioned the architecture: x86_64 throughout for me.