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>
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@ -513,19 +513,19 @@ config CPU_SUP_UMC_32
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If unsure, say N.
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If unsure, say N.
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config X86_DS
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config X86_DS
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bool "Debug Store support"
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def_bool X86_PTRACE_BTS
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default y
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depends on X86_DEBUGCTLMSR
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help
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Add support for Debug Store.
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This allows the kernel to provide a memory buffer to the hardware
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to store various profiling and tracing events.
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config X86_PTRACE_BTS
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config X86_PTRACE_BTS
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bool "ptrace interface to Branch Trace Store"
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bool "Branch Trace Store"
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default y
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default y
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depends on (X86_DS && X86_DEBUGCTLMSR)
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depends on X86_DEBUGCTLMSR
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help
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help
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Add a ptrace interface to allow collecting an execution trace
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This adds a ptrace interface to the hardware's branch trace store.
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of the traced task.
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This collects control flow changes in a (cyclic) buffer and allows
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Debuggers may use it to collect an execution trace of the debugged
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debuggers to fill in the gaps and show an execution trace of the debuggee.
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application in order to answer the question 'how did I get here?'.
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Debuggers may trace user mode as well as kernel mode.
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Say Y unless there is no application development on this machine
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and you want to save a small amount of code size.
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