lkml.org 
[lkml]   [2010]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -tip v3] kprobes: Hide CONFIG_OPTPROBES and set if arch support optimized kprobes
Date
Hide CONFIG_OPTPROBES and set if the arch supports optimized kprobes
(IOW, HAVE_OPTPROBES=y), since this option doesn't change the major
behavior of kprobes, and workarounds for minor changes are documented.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Dieter Ries <mail@dieterries.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
---

Documentation/kprobes.txt | 10 ++--------
arch/Kconfig | 9 ++-------
2 files changed, 4 insertions(+), 15 deletions(-)

diff --git a/Documentation/kprobes.txt b/Documentation/kprobes.txt
index 2f9115c..61c291c 100644
--- a/Documentation/kprobes.txt
+++ b/Documentation/kprobes.txt
@@ -165,8 +165,8 @@ the user entry_handler invocation is also skipped.

1.4 How Does Jump Optimization Work?

-If you configured your kernel with CONFIG_OPTPROBES=y (currently
-this option is supported on x86/x86-64, non-preemptive kernel) and
+If your kernel is built with CONFIG_OPTPROBES=y (currently this flag
+is automatically set 'y' on x86/x86-64, non-preemptive kernel) and
the "debug.kprobes_optimization" kernel parameter is set to 1 (see
sysctl(8)), Kprobes tries to reduce probe-hit overhead by using a jump
instruction instead of a breakpoint instruction at each probepoint.
@@ -271,8 +271,6 @@ tweak the kernel's execution path, you need to suppress optimization,
using one of the following techniques:
- Specify an empty function for the kprobe's post_handler or break_handler.
or
-- Config CONFIG_OPTPROBES=n.
- or
- Execute 'sysctl -w debug.kprobes_optimization=n'

2. Architectures Supported
@@ -307,10 +305,6 @@ it useful to "Compile the kernel with debug info" (CONFIG_DEBUG_INFO),
so you can use "objdump -d -l vmlinux" to see the source-to-object
code mapping.

-If you want to reduce probing overhead, set "Kprobes jump optimization
-support" (CONFIG_OPTPROBES) to "y". You can find this option under the
-"Kprobes" line.
-
4. API Reference

The Kprobes API includes a "register" function and an "unregister"
diff --git a/arch/Kconfig b/arch/Kconfig
index e5eb133..f06010f 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -42,15 +42,10 @@ config KPROBES
If in doubt, say "N".

config OPTPROBES
- bool "Kprobes jump optimization support (EXPERIMENTAL)"
- default y
- depends on KPROBES
+ def_bool y
+ depends on KPROBES && HAVE_OPTPROBES
depends on !PREEMPT
- depends on HAVE_OPTPROBES
select KALLSYMS_ALL
- help
- This option will allow kprobes to optimize breakpoint to
- a jump for reducing its overhead.

config HAVE_EFFICIENT_UNALIGNED_ACCESS
bool

--
Masami Hiramatsu
e-mail: mhiramat@redhat.com


\
 
 \ /
  Last update: 2010-03-15 17:57    [W:0.072 / U:0.944 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site