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From: Markus Metzger <markus.t.metzger@intel.com>
To: hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@elte.hu,
tglx@linutronix.de
Cc: markus.t.metzger@intel.com, markus.t.metzger@gmail.com,
akpm@linux-foundation.org
Subject: [patch] x86, bts: improve help text for BTS config
Date: Fri, 17 Oct 2008 09:09:27 +0200 [thread overview]
Message-ID: <20081017090927.A5454@sedona.ch.intel.com> (raw)
Improve the help text of the X86_PTRACE_BTS config.
Make X86_DS invisible and depend on X86_PTRACE_BTS.
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
---
Index: gits/arch/x86/Kconfig.cpu
===================================================================
--- gits.orig/arch/x86/Kconfig.cpu 2008-10-15 09:02:47.000000000 +0200
+++ gits/arch/x86/Kconfig.cpu 2008-10-15 12:59:21.000000000 +0200
@@ -513,19 +513,19 @@
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.
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next reply other threads:[~2008-10-17 7:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-17 7:09 Markus Metzger [this message]
2008-10-20 13:26 ` Ingo Molnar
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