Haswell LBR call stacks

[Milian Wolff <mail@milianw.de>]

[-- Attachment #1: Type: text/plain, Size: 890 bytes --]

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
mail@milianw.de
http://milianw.de

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 181 bytes --]