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    SubjectRe: [BUG] perf: bogus correlation of kernel symbols
    On Thu, May 12, 2011 at 7:48 AM, Stephane Eranian <> wrote:
    > I think there is a serious problem with kernel symbol correlation
    > with the latest perf in 2.6.39-rc7-tip.

    Yeah. It's annoying. It's a "perf" bug, though - triggered by
    /proc/sys/kernel/kptr_restrict being set to 1.

    The bug is that perf doesn't say "I can't match kernel symbols", but
    instead does some crazy matching and gives total crap module
    information (I think it just picks the one that shows up last in

    That said, I have considered just reverting the thing that makes
    kptr_restrict be 1 by default. I do like the security implications of
    restricting visibility into kernel pointers, but I also think that
    security rules that make the system less usable are dubious. So I


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      Last update: 2011-05-12 22:35    [W:0.021 / U:1.304 seconds]
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