Re: [patch 13/26] Xen-paravirt_ops: Consistently wrap paravirt ops callsites to make them patchable

Chuck Ebbert
2007-03-20T16:14:08Z

Eric W. Biederman wrote:

> I'm conflicted about the dwarf unwinder. I was off doing other things
> at the time so I missed the pain, but I do have a distinct recollection of
> the back traces on x86_64 being distinctly worse the on i386. Lately
> I haven't seen that so it may be I was misinterpreting what I was
> seeing, and the compiler optimizations were what gave me such weird
> back traces.
>

Well, if you compile x86_64 with frame pointers it helps a bit because
the compiler doesn't tail merge function calls. But the stack backtrace
ignores the frame pointers even if they're present, unlike i386 which
will use them.