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



config X86_DS

	bool "Debug Store support"

	default y

	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.

	def_bool X86_PTRACE_BTS

	depends on X86_DEBUGCTLMSR



config X86_PTRACE_BTS

	bool "ptrace interface to Branch Trace Store"

	bool "Branch Trace Store"

	default y

	depends on (X86_DS && X86_DEBUGCTLMSR)

	depends on X86_DEBUGCTLMSR

	help

	  Add a ptrace interface to allow collecting an execution trace

	  of the traced task.

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

	  debuggers to fill in the gaps and show an execution trace of the debuggee.
 
	  This adds a ptrace interface to the hardware's branch trace store.



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

	  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.