Hey all, Some time ago I read this interesting article:
http://article.gmane.org/gmane.linux.kernel/1809078 It mentions a new call stack unwinding for perf, based on Haswell LBR facility. I now have a new Laptop with a Broadwell i7-5600U CPU, but my perf version 4.0.3 running against a Linux 4.0.4 kernel (all vanilla Archlinux versions) does not seem to support this feature. Was it ever included in the mainline? Is a special compiler flag required to enable this feature? Anything else I'm missing? callchain: Unknown --call-graph option value: lbr usage: perf record [<options>] [<command>] or: perf record [<options>] -- <command> [<options>] --call-graph <mode[,dump_size]> setup and enables call-graph (stack chain/backtrace) recording: fp dwarf Thanks -- Milian Wolff [email protected] http://milianw.de
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