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    SubjectRe: [PATCH 01/52] perf tools: Fix jump label always changing during tracing
    On 07/23/2014 09:58 AM, Peter Zijlstra wrote:
    > On Wed, Jul 23, 2014 at 09:07:32AM +0300, Adrian Hunter wrote:
    >> On 07/22/2014 05:11 PM, Peter Zijlstra wrote:
    >>> On Tue, Jul 22, 2014 at 11:00:34AM -0300, Arnaldo Carvalho de Melo wrote:
    >>>> Em Tue, Jul 22, 2014 at 04:17:10PM +0300, Adrian Hunter escreveu:
    >>>>> Intel PT decoding walks the object code to reconstruct
    >>>>> the trace. A jump label change during tracing causes
    >>>>> decoding errors.
    >>>
    >>> You'd better fix that, jump_labels can change any time and they're all
    >>> over the frigging place.
    >>>
    >>
    >> Perhaps a general method is needed to be able to deal with kernel
    >> self-modifying code.
    >
    > I know people are looking at doing the same to userspace, is that also a
    > problem?

    Yes, most significantly JIT-compiled code.



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