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    SubjectRe: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
    Mathieu Desnoyers wrote:
    >
    > As the maintainer of the out-of-tree LTTng tracer, which hooks in the
    > page fault handler with tracepoints, and which can build almost entirely
    > as modules, I am very tempted to argue that having the nmi-code entirely
    > robust wrt in-kernel page faults would be a very-nice-to-have feature.
    >

    I doubt that is ever going to be reliable, due to reentrancy issues.

    -hpa


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