linux-toradex.git/arch/x86/include/asm/ftrace.h, branch v3.3.3

ftrace/x86: mcount offset calculation

2011-05-16T18:55:57+00:00

Do the mcount offset adjustment in the recordmcount.pl/recordmcount.[ch]
at compile time and not in ftrace_call_adjust at run time.

Signed-off-by: Martin Schwidefsky 
Signed-off-by: Steven Rostedt

tracing: Remove FTRACE_SYSCALL_MAX definitions

2009-08-26T19:30:39+00:00

Remove the FTRACE_SYSCALL_MAX definitions now that we have converted the
syscall event tracing code to use NR_syscalls.

Signed-off-by: Jason Baron 
Cc: Paul Mundt 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Lai Jiangshan 
Cc: Steven Rostedt 
Cc: Peter Zijlstra 
Cc: Mathieu Desnoyers 
Cc: Jiaying Zhang 
Cc: Martin Bligh 
Cc: Li Zefan 
Cc: Josh Stone 
Cc: Thomas Gleixner 
Cc: H. Peter Anwin 
Cc: Hendrik Brueckner 
Cc: Heiko Carstens 
LKML-Reference: 
Signed-off-by: Frederic Weisbecker

tracing: Update FTRACE_SYSCALL_MAX

2009-08-11T18:35:27+00:00

update FTRACE_SYSCALL_MAX to the current number of syscalls

FTRACE_SYSCALL_MAX is a temporary solution to get the number of
syscalls supported by the arch until we find a more dynamic way
to get this number.

Signed-off-by: Jason Baron 
Cc: Lai Jiangshan 
Cc: Steven Rostedt 
Cc: Peter Zijlstra 
Cc: Mathieu Desnoyers 
Cc: Jiaying Zhang 
Cc: Martin Bligh 
Cc: Li Zefan 
Cc: Masami Hiramatsu 
Signed-off-by: Frederic Weisbecker

tracing/syscalls: support for syscalls tracing on x86

2009-03-13T15:57:42+00:00

Extend x86 architecture syscall tracing support with syscall
metadata table details.

(The upcoming core syscall tracing modifications rely on this.)

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
LKML-Reference: <1236955332-10133-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar

tracing/function-graph-tracer: make arch generic push pop functions

2009-02-18T18:43:04+00:00

There is nothing really arch specific of the push and pop functions
used by the function graph tracer. This patch moves them to generic
code.

Acked-by: Frederic Weisbecker 
Acked-by: Ingo Molnar 
Signed-off-by: Steven Rostedt

x86: entry_64 - introduce FTRACE_ frame macro v2

2008-12-16T23:26:38+00:00

Impact: clean up

Itroduce MCOUNT_SAVE/RESTORE_FRAME which allow us to
save a number of lines on source level.

Also fix a comment in ftrace.h.

Signed-off-by: Ingo Molnar

tracing/function-return-tracer: change the name into function-graph-tracer

2008-11-26T00:59:45+00:00

Impact: cleanup

This patch changes the name of the "return function tracer" into
function-graph-tracer which is a more suitable name for a tracing
which makes one able to retrieve the ordered call stack during
the code flow.

Signed-off-by: Frederic Weisbecker 
Acked-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

tracing/function-return-tracer: store return stack into task_struct and allocate it dynamically

2008-11-23T08:17:26+00:00

Impact: use deeper function tracing depth safely

Some tests showed that function return tracing needed a more deeper depth
of function calls. But it could be unsafe to store these return addresses
to the stack.

So these arrays will now be allocated dynamically into task_struct of current
only when the tracer is activated.

Typical scheme when tracer is activated:
- allocate a return stack for each task in global list.
- fork: allocate the return stack for the newly created task
- exit: free return stack of current
- idle init: same as fork

I chose a default depth of 50. I don't have overruns anymore.

Signed-off-by: Frederic Weisbecker 
Signed-off-by: Ingo Molnar

ftrace: pass module struct to arch dynamic ftrace functions

2008-11-16T06:36:02+00:00

Impact: allow archs more flexibility on dynamic ftrace implementations

Dynamic ftrace has largly been developed on x86. Since x86 does not
have the same limitations as other architectures, the ftrace interaction
between the generic code and the architecture specific code was not
flexible enough to handle some of the issues that other architectures
have.

Most notably, module trampolines. Due to the limited branch distance
that archs make in calling kernel core code from modules, the module
load code must create a trampoline to jump to what will make the
larger jump into core kernel code.

The problem arises when this happens to a call to mcount. Ftrace checks
all code before modifying it and makes sure the current code is what
it expects. Right now, there is not enough information to handle modifying
module trampolines.

This patch changes the API between generic dynamic ftrace code and
the arch dependent code. There is now two functions for modifying code:

  ftrace_make_nop(mod, rec, addr) - convert the code at rec->ip into
       a nop, where the original text is calling addr. (mod is the
       module struct if called by module init)

  ftrace_make_caller(rec, addr) - convert the code rec->ip that should
       be a nop into a caller to addr.

The record "rec" now has a new field called "arch" where the architecture
can add any special attributes to each call site record.

Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

tracing, x86: add low level support for ftrace return tracing

2008-11-11T09:29:11+00:00

Impact: add infrastructure for function-return tracing

Add low level support for ftrace return tracing.

This plug-in stores return addresses on the thread_info structure of
the current task.

The index of the current return address is initialized when the task
is the first one (init) and when a process forks (the child). It is
not needed when a task does a sys_execve because after this syscall,
it still needs to return on the kernel functions it called.

Note that the code of return_to_handler has been suggested by Steven
Rostedt as almost all of the ideas of improvements in this V3.

For purpose of security, arch/x86/kernel/process_32.c is not traced
because __switch_to() changes the current task during its execution.
That could cause inconsistency in the stored return address of this
function even if I didn't have any crash after testing with tracing on
this function enabled.

Signed-off-by: Frederic Weisbecker 
Cc: Steven Rostedt 
Signed-off-by: Ingo Molnar