linux-stable.git/include/linux/ftrace.h, branch linux-2.6.30.y

tracing/syscalls: use a dedicated file header

2009-04-09T03:43:32+00:00

Impact: fix build warnings and possibe compat misbehavior on IA64

Building a kernel on ia64 might trigger these ugly build warnings:

CC      arch/ia64/ia32/sys_ia32.o
In file included from arch/ia64/ia32/sys_ia32.c:55:
arch/ia64/ia32/ia32priv.h:290:1: warning: "elf_check_arch" redefined
In file included from include/linux/elf.h:7,
                 from include/linux/module.h:14,
                 from include/linux/ftrace.h:8,
                 from include/linux/syscalls.h:68,
                 from arch/ia64/ia32/sys_ia32.c:18:
arch/ia64/include/asm/elf.h:19:1: warning: this is the location of the previous definition
[...]

sys_ia32.c includes linux/syscalls.h which in turn includes linux/ftrace.h
to import the syscalls tracing prototypes.

But including ftrace.h can pull too much things for a low level file,
especially on ia64 where the ia32 private headers conflict with higher
level headers.

Now we isolate the syscall tracing headers in their own lightweight file.

Reported-by: Tony Luck 
Tested-by: Tony Luck 
Signed-off-by: Frederic Weisbecker 
Acked-by: Tony Luck 
Signed-off-by: Steven Rostedt 
Cc: Peter Zijlstra 
Cc: Jason Baron 
Cc: "Frank Ch. Eigler" 
Cc: Mathieu Desnoyers 
Cc: KOSAKI Motohiro 
Cc: Lai Jiangshan 
Cc: Jiaying Zhang 
Cc: Michael Rubin 
Cc: Martin Bligh 
Cc: Michael Davidson 
LKML-Reference: <20090408184058.GB6017@nowhere>
Signed-off-by: Ingo Molnar

tracing: append a comma to INIT_FTRACE_GRAPH

2009-04-08T08:25:25+00:00

Impact: dont break future extensions of INIT_TASK

While not a problem right now, due to lack of a comma, build fails if
elements are appended to INIT_TASK() macro in development code:

 arch/x86/kernel/init_task.c:33: error: request for member `XXXXXXXXXX' in something not a structure or union
 arch/x86/kernel/init_task.c:33: error: initializer element is not constant
 arch/x86/kernel/init_task.c:33: error: (near initialization for `init_task.ret_stack')
 make[1]: *** [arch/x86/kernel/init_task.o] Error 1
 make: *** [arch/x86/kernel] Error 2

Signed-off-by: Tetsuo Handa 
Cc: srostedt@redhat.com
LKML-Reference: <200904080505.n3855hcn017109@www262.sakura.ne.jp>
Signed-off-by: Ingo Molnar

function-graph: add proper initialization for init task

2009-04-07T12:00:39+00:00

Impact: fix to crash going to kexec

The init task did not properly initialize the function graph pointers.
Altough these pointers are NULL, they can not be assumed to be NULL
for the init task, and must still be properly initialize.

This usually is not an issue since a problem only arises when a task
exits, and the init tasks do not usually exit. But when doing tests
with kexec, the init tasks do exit, and the bug appears.

This patch properly initializes the init tasks function graph data
structures.

Reported-and-Tested-by: Yinghai Lu 
LKML-Reference: 
Signed-off-by: Steven Rostedt 
Signed-off-by: Ingo Molnar

tracing: use union for multi-usages field

2009-03-24T15:43:12+00:00

Impact: cleanup

struct dyn_ftrace::ip has different usages in his lifecycle,
we use union for it. And also for struct dyn_ftrace::flags.

Signed-off-by: Lai Jiangshan 
Cc: Steven Rostedt 
Cc: Frederic Weisbecker 
LKML-Reference: <49C871BE.3080405@cn.fujitsu.com>
Signed-off-by: Ingo Molnar

function-graph: moved the timestamp from arch to generic code

2009-03-24T13:31:34+00:00

This patch move the timestamp from happening in the arch specific
code into the general code. This allows for better control by the tracer
to time manipulation.

Signed-off-by: Steven Rostedt

Merge branches 'tracing/ftrace', 'tracing/syscalls' and 'linus' into tracing/core

2009-03-16T08:12:42+00:00

Conflicts:
	arch/parisc/kernel/irq.c

tracing/syscalls: core infrastructure for syscalls tracing, enhancements

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

Impact: new feature

This adds the generic support for syscalls tracing. This is
currently exploited through a devoted tracer but other tracing
engines can use it. (They just have to play with
{start,stop}_ftrace_syscalls() and use the display callbacks
unless they want to override them.)

The syscalls prototypes definitions are abused here to steal
some metadata informations:

- syscall name, param types, param names, number of params

The syscall addr is not directly saved during this definition
because we don't know if its prototype is available in the
namespace. But we don't really need it. The arch has just to
build a function able to resolve the syscall number to its
metadata struct.

The current tracer prints the syscall names, parameters names
and values (and their types optionally). Currently the value is
a raw hex but higher level values diplaying is on my TODO list.

Signed-off-by: Frederic Weisbecker 
LKML-Reference: <1236955332-10133-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar

ftrace: remove struct list_head from struct dyn_ftrace

2009-03-13T10:36:20+00:00

Impact: save memory

The struct dyn_ftrace table is very large, this patch will save
about 50%.

Signed-off-by: Lai Jiangshan 
Cc: Steven Rostedt 
LKML-Reference: <49BA2C9F.8020009@cn.fujitsu.com>
Signed-off-by: Ingo Molnar

tracing/ftrace: syscall tracing infrastructure, basics

2009-03-13T05:25:43+00:00

Provide basic callbacks to do syscall tracing.

Signed-off-by: Frederic Weisbecker 
Acked-by: Steven Rostedt 
Cc: Lai Jiangshan 
LKML-Reference: <1236401580-5758-2-git-send-email-fweisbec@gmail.com>
[ simplified it to a trace_printk() for now. ]
Signed-off-by: Ingo Molnar

tracing/core: drop the old trace_printk() implementation in favour of trace_bprintk()

2009-03-06T16:59:12+00:00

Impact: faster and lighter tracing

Now that we have trace_bprintk() which is faster and consume lesser
memory than trace_printk() and has the same purpose, we can now drop
the old implementation in favour of the binary one from trace_bprintk(),
which means we move all the implementation of trace_bprintk() to
trace_printk(), so the Api doesn't change except that we must now use
trace_seq_bprintk() to print the TRACE_PRINT entries.

Some changes result of this:

- Previously, trace_bprintk depended of a single tracer and couldn't
  work without. This tracer has been dropped and the whole implementation
  of trace_printk() (like the module formats management) is now integrated
  in the tracing core (comes with CONFIG_TRACING), though we keep the file
  trace_printk (previously trace_bprintk.c) where we can find the module
  management. Thus we don't overflow trace.c

- changes some parts to use trace_seq_bprintk() to print TRACE_PRINT entries.

- change a bit trace_printk/trace_vprintk macros to support non-builtin formats
  constants, and fix 'const' qualifiers warnings. But this is all transparent for
  developers.

- etc...

V2:

- Rebase against last changes
- Fix mispell on the changelog

V3:

- Rebase against last changes (moving trace_printk() to kernel.h)

Signed-off-by: Frederic Weisbecker 
Acked-by: Steven Rostedt 
LKML-Reference: <1236356510-8381-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar