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

From: Frederic Weisbecker
Date: Fri Jan 07 2011 - 11:27:38 EST

On Fri, Jan 07, 2011 at 04:13:58PM +0000, Jan Beulich wrote:
> >>> On 07.01.11 at 17:05, Frederic Weisbecker <fweisbec@xxxxxxxxx> 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.
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