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authorMarkus Metzger <markus.t.metzger@intel.com>2008-10-17 09:09:27 +0200
committerIngo Molnar <mingo@elte.hu>2008-10-28 16:39:37 +0100
commit531f6ed7de911e975352fbb2b228367121da630a (patch)
tree905c7705934202b912f916391a127da6f64d5150
parent71cced6eb044f5b096d35755963f3a2035603b73 (diff)
downloadlinux-2.6.34-ux500-531f6ed7de911e975352fbb2b228367121da630a.tar.gz
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: Roland Dreier <rdreier@cisco.com> Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/Kconfig.cpu24
1 files changed, 12 insertions, 12 deletions
diff --git a/arch/x86/Kconfig.cpu b/arch/x86/Kconfig.cpu
index 0b7c4a3f065..b815664fe37 100644
--- a/arch/x86/Kconfig.cpu
+++ b/arch/x86/Kconfig.cpu
@@ -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.