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SubjectRe: [PATCH v6 00/71] Introducing the Maple Tree
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.

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