Syscalls tracing

Here is a first attempt, quick one-shot, to provide a syscall tracing
infrastructure on ftrace.

The RFC prefix is here to reflect its ugliness on various parts.
The compromise between tracing reliabilty and speed is hard to balance.
For example I guess the basic and horrid string mask should be dropped in favour
of something else, which takes care of the volatile strings from the userspace.

But I hope a lot of ideas to make it better will come along this discussion.

Frederic Weisbecker (2):
  tracing/ftrace: syscall tracing infrastructure
  tracing/x86: basic implementation of syscall tracing for x86-64

 arch/x86/Kconfig                   |    1 +
 arch/x86/include/asm/ftrace.h      |    7 +
 arch/x86/include/asm/thread_info.h |    9 +-
 arch/x86/kernel/ftrace.c           |   15 ++
 arch/x86/kernel/ptrace.c           |    7 +
 include/linux/ftrace.h             |   44 ++++++
 kernel/trace/Kconfig               |   10 ++
 kernel/trace/Makefile              |    1 +
 kernel/trace/trace.c               |    6 +
 kernel/trace/trace.h               |   32 ++++
 kernel/trace/trace_syscalls.c      |  284 ++++++++++++++++++++++++++++++++++++
 11 files changed, 413 insertions(+), 3 deletions(-)
 create mode 100644 kernel/trace/trace_syscalls.c

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