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x86, bts, ftrace: a BTS ftrace plug-in prototype

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Impact: add new ftrace plugin

A prototype for a BTS ftrace plug-in.

The tracer collects branch trace in a cyclic buffer for each cpu.

The tracer is not configurable and the trace for each snapshot is
appended when doing cat /debug/tracing/trace.

This is a proof of concept that will be extended with future patches
to become a (hopefully) useful tool.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Markus Metzger
2008-11-25 09:24:15 +01:00
committed by Ingo Molnar
parent 8bba1bf5e2
commit 1e9b51c283
5 changed files with 301 additions and 0 deletions
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arch/x86/Kconfig.cpu
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@@ -515,6 +515,7 @@ config CPU_SUP_UMC_32
config X86_DS
def_bool X86_PTRACE_BTS
depends on X86_DEBUGCTLMSR
select HAVE_HW_BRANCH_TRACER
config X86_PTRACE_BTS
bool "Branch Trace Store"