On 02/21/2015 05:27 PM, Mark Nelson wrote:
I've still had the best luck using DWARF though. I was able to get much better stack traces with it. A semi-modern kernel with libunwind support in perf is needed though. I just checked one of our RHEL7 and it sadly doesn't look like they have it linked. We really should hassle them to get this in. Perf on our Ubuntu 14.04 does use libunwind, primarily due to the kernel bug we submitted: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1248289
FWIW, I followed up with the RHEL7 kernel guys who pointed out that while RHEL 7.0 doesn't have dwarf support in perf, 7.1 does, and it's using what appears to be a better libdw unwind implementation:
http://lwn.net/Articles/579508/
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