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    SubjectRe: [patch 1/2] x86_64 page fault NMI-safe
    > > In fact I'm pretty sure it worked originally. Perhaps it regressed?
    > I'd first ask the obvious to Perf authors: does perf issue vmalloc_sync_all()
    > between percpu data allocation and tracing activation ? The generic ring buffer
    > library I posted last week does it already as a precaution for this very
    > specific reason (making sure NMIs never trigger page faults).

    I suspect the low level per cpu allocation functions should
    just call it.


    -- -- Speaking for myself only.

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