Hi, As part of enabling frame pointers system wide for Fedora to get fast system wide stack unwinding, we're now looking to do the same for s390x after previously enabling frame pointers for x86-64 and aarch64. >From what we can find, on s390x stack unwinding is done via the "-mbackchain" compiler option. However, from some early experiments rebuilding a small part of the distro, this option alone does not seem to result in usable stack traces in perf (perf record -g => perf report). Are there any other compiler options that need to be enabled in order to get usable stack traces in perf for s390x? Has anyone managed to get this working before? Cheers, Daan De Meyer
