linux-toradex.git/include/linux/kprobes.h, branch v2.6.34

kprobes: Jump optimization sysctl interface

2010-02-25T16:49:25+00:00

Add /proc/sys/debug/kprobes-optimization sysctl which enables
and disables kprobes jump optimization on the fly for debugging.

Changes in v7:
 - Remove ctl_name = CTL_UNNUMBERED for upstream compatibility.

Changes in v6:
- Update comments and coding style.

Signed-off-by: Masami Hiramatsu 
Cc: systemtap 
Cc: DLE 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Srikar Dronamraju 
Cc: Christoph Hellwig 
Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Anders Kaseorg 
Cc: Tim Abbott 
Cc: Andi Kleen 
Cc: Jason Baron 
Cc: Mathieu Desnoyers 
Cc: Frederic Weisbecker 
Cc: Ananth N Mavinakayanahalli 
LKML-Reference: <20100225133415.6725.8274.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar

kprobes: Introduce kprobes jump optimization

2010-02-25T16:49:24+00:00

Introduce kprobes jump optimization arch-independent parts.
Kprobes uses breakpoint instruction for interrupting execution
flow, on some architectures, it can be replaced by a jump
instruction and interruption emulation code. This gains kprobs'
performance drastically.

To enable this feature, set CONFIG_OPTPROBES=y (default y if the
arch supports OPTPROBE).

Changes in v9:
 - Fix a bug to optimize probe when enabling.
 - Check nearby probes can be optimize/unoptimize when disarming/arming
   kprobes, instead of registering/unregistering. This will help
   kprobe-tracer because most of probes on it are usually disabled.

Changes in v6:
 - Cleanup coding style for readability.
 - Add comments around get/put_online_cpus().

Changes in v5:
 - Use get_online_cpus()/put_online_cpus() for avoiding text_mutex
   deadlock.

Signed-off-by: Masami Hiramatsu 
Cc: systemtap 
Cc: DLE 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Srikar Dronamraju 
Cc: Christoph Hellwig 
Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
Cc: Anders Kaseorg 
Cc: Tim Abbott 
Cc: Andi Kleen 
Cc: Jason Baron 
Cc: Mathieu Desnoyers 
Cc: Frederic Weisbecker 
Cc: Ananth N Mavinakayanahalli 
LKML-Reference: <20100225133407.6725.81992.stgit@localhost6.localdomain6>
Signed-off-by: Ingo Molnar

Merge commit 'linus/master' into tracing/kprobes

2009-09-23T21:08:43+00:00

Conflicts:
	kernel/trace/Makefile
	kernel/trace/trace.h
	kernel/trace/trace_event_types.h
	kernel/trace/trace_export.c

Merge reason:
	Sync with latest significant tracing core changes.

tracing: remove notrace from __kprobes annotation

2009-09-16T03:51:31+00:00

When ftrace had issues with NMIs, it was needed to annotate all
the areas that kprobes had issues with notrace. Now that ftrace is
NMI safe, the functions that limit ftrace from tracing are just a
small few.

Kprobes is too big of a set for ftrace not to trace. Remove the
coupling.

Signed-off-by: Steven Rostedt

tracing/kprobes: Dump the culprit kprobe in case of kprobe recursion

2009-08-27T00:33:03+00:00

Kprobes can enter into a probing recursion, ie: a kprobe that does an
endless loop because one of its core mechanism function used during
probing is also probed itself.

This patch helps pinpointing the kprobe that raised such recursion
by dumping it and raising a BUG instead of a warning (we also disarm
the kprobe to try avoiding recursion in BUG itself). Having a BUG
instead of a warning stops the stacktrace in the right place and
doesn't pollute the logs with hundreds of traces that eventually end
up in a stack overflow.

Signed-off-by: Frederic Weisbecker 
Cc: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli

kprobes: support kretprobe and jprobe per-probe disabling

2009-04-07T15:31:08+00:00

Add disable/enable_kretprobe() and disable/enable_jprobe().

Signed-off-by: Masami Hiramatsu 
Acked-by: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Cc: David S. Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: support per-kprobe disabling

2009-04-07T15:31:08+00:00

Add disable_kprobe() and enable_kprobe() to disable/enable kprobes
temporarily.

disable_kprobe() asynchronously disables probe handlers of specified
kprobe.  So, after calling it, some handlers can be called at a while.
enable_kprobe() enables specified kprobe.

aggr_pre_handler and aggr_post_handler check disabled probes.  On the
other hand aggr_break_handler and aggr_fault_handler don't check it
because these handlers will be called while executing pre or post handlers
and usually those help error handling.

Signed-off-by: Masami Hiramatsu 
Acked-by: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Cc: David S. Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: cleanup comment style in kprobes.h

2009-04-07T15:31:08+00:00

Fix comment style in kprobes.h.

Signed-off-by: Masami Hiramatsu 
Acked-by: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Cc: David S. Miller 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

x86, mm, kprobes: fault.c, simplify notify_page_fault()

2009-02-20T23:09:42+00:00

Impact: cleanup

Remove an #ifdef from notify_page_fault(). The function still
compiles to nothing in the !CONFIG_KPROBES case.

Introduce kprobes_built_in() and kprobe_fault_handler() helpers
to allow this - they returns 0 if !CONFIG_KPROBES.

No code changed:

   text	   data	    bss	    dec	    hex	filename
   4618	     32	     24	   4674	   1242	fault.o.before
   4618	     32	     24	   4674	   1242	fault.o.after

Cc: Masami Hiramatsu 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Signed-off-by: Ingo Molnar

kprobes: fix module compilation error with CONFIG_KPROBES=n

2009-01-30T02:04:43+00:00

Define kprobes related data structures even if CONFIG_KPROBES is not set.
This fixes compilation errors which occur if CONFIG_KPROBES is not set, in
kprobe using modules.

[akpm@linux-foundation.org: fix build for non-kprobes-supporting architectures]
Reviewed-by: Ananth N Mavinakayanahalli 
Signed-off-by: Masami Hiramatsu 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds