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Commit 531f6ed7 authored by Markus Metzger's avatar Markus Metzger Committed by Ingo Molnar
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x86, bts: improve help text for BTS config 



Improve the help text of the X86_PTRACE_BTS config.
Make X86_DS invisible and depend on X86_PTRACE_BTS.

Reported-by: default avatarRoland Dreier <rdreier@cisco.com>
Signed-off-by: default avatarMarkus Metzger <markus.t.metzger@intel.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 71cced6e

arch/x86/Kconfig.cpu

+12 −12
Original line number Original line Diff line number Diff line
@@ -513,19 +513,19 @@ config CPU_SUP_UMC_32 
	  If unsure, say N.

	  If unsure, say N.





config X86_DS

config X86_DS

	bool "Debug Store support"

	def_bool X86_PTRACE_BTS

	default y

	depends on X86_DEBUGCTLMSR

	help

	  Add support for Debug Store.

	  This allows the kernel to provide a memory buffer to the hardware

	  to store various profiling and tracing events.





config X86_PTRACE_BTS

config X86_PTRACE_BTS

	bool "ptrace interface to Branch Trace Store"

	bool "Branch Trace Store"

	default y

	default y

	depends on (X86_DS && X86_DEBUGCTLMSR)

	depends on X86_DEBUGCTLMSR

	help

	help

	  Add a ptrace interface to allow collecting an execution trace

	  This adds a ptrace interface to the hardware's branch trace store.

	  of the traced task.



	  This collects control flow changes in a (cyclic) buffer and allows

	  Debuggers may use it to collect an execution trace of the debugged

	  debuggers to fill in the gaps and show an execution trace of the debuggee.
 
	  application in order to answer the question 'how did I get here?'.

	  Debuggers may trace user mode as well as kernel mode.



	  Say Y unless there is no application development on this machine

	  and you want to save a small amount of code size.