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    SubjectRe: [RFC PATCH 1/2] x86: Fix rbp saving in pt_regs on irq entry

    * Frederic Weisbecker <fweisbec@gmail.com> wrote:

    > On Fri, Jan 07, 2011 at 04:13:58PM +0000, Jan Beulich wrote:
    > > >>> On 07.01.11 at 17:05, Frederic Weisbecker <fweisbec@gmail.com> wrote:
    > > > Once I'll have perf callchain based on CFI ready, we'll perhaps find some
    > > > issues
    > > > there. Although I guess there are already tools that can make use of that.
    > >
    > > Is this to read that you're planning to do a re-spin of the CFI
    > > unwinding code (which I'm not allowed to submit another time,
    > > but which we've been using for years in SuSE distros) then?
    >
    > An in-kernel CFI unwinder?
    >
    > No the intended CFI unwinding that I'm working on for perf is made
    > on post-processing, on top of partial stack and regs snapshots.
    >
    > The true unwinding is computed in userspace.

    I think that design will be fundamentally more robust and more flexible than an
    in-kernel unwinder.

    Thanks,

    Ingo


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