Re: [libunwind] backtrace on EM64T

[Arun Sharma]

David Mosberger-Tang wrote:

> > I can't seem to find a noticable improvement.
>
>
> That's because caching has not been implemented yet for DWARF2 (it is,
> for the ia64 unwinder and makes a huge difference).  The code is
> already set up to handle caching, but somebody would have to fill in
> the actual code...

I see that ia64 implements a script cache and there is no such thing on 
x86-64. Would it be correct to say that a dwarf2 based system should 
implement a cache of ip -> unw_proc_info_t mappings?

As things stand now, using libunwind results in a large number of calls 
to rt_sigprocmask().

        -Arun