From: Milian Wolff <mail@milianw.de>
To: linux-perf-users@vger.kernel.org
Subject: Haswell LBR call stacks
Date: Sun, 14 Jun 2015 13:02:57 +0200 [thread overview]
Message-ID: <1682663.JO3lAz5bZo@agathebauer> (raw)
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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
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next reply other threads:[~2015-06-14 11:12 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-14 11:02 Milian Wolff [this message]
2015-08-04 17:24 ` Haswell LBR call stacks - broken Milian Wolff
2015-08-04 18:10 ` Andi Kleen
2015-08-04 21:41 ` Liang, Kan
2015-08-05 9:02 ` Milian Wolff
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