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x86, bts: improve help text for BTS config

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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>
This commit is contained in:
Markus Metzger 2008-10-17 09:09:27 +02:00 committed by Ingo Molnar
parent 71cced6eb0
commit 531f6ed7de
1 changed files with 12 additions and 12 deletions
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24
arch/x86/Kconfig.cpu
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@ -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.