Re: [RFC] Sort inclusive

[Arun Sharma <asharma@fb.com>]

On 3/5/12 10:57 PM, Ingo Molnar wrote:

> Btw., assuming that you are profiling user-space applications
> via call-chains, how do you deal with the lack of dwarf decoding
> done by perf, in particular on 64-bit x86 systems where most
> distros don't compile call-chains into libraries and
> application? In what practical situations does that limitation
> hinder you and what do you do about it - rebuild your apps with
> frame pointers included?

Yes - we're rebuilding everything with frame pointers so we could get 
callchains. While this works for C/C++, I'm not convinced that we have a 
good solution for JITs where there may be multiple stacks (eg: one each 
for interpreted and JIT code), and the kernel may not be able to unwind 
without dwarf decoding. For now, we're going with the /tmp/perf-$pid.txt 
based solution for JITs.

I'll post a new patch with the code refactored into smaller functions.

  -Arun