linux-kernel - [PATCH 0/2] convert ftrace syscalls to TRACE

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Date:	Fri, 5 Jun 2009 14:07:59 -0400
From:	Jason Baron <jbaron@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...il.com, mingo@...e.hu, laijs@...fujitsu.com,
	rostedt@...dmis.org, peterz@...radead.org,
	mathieu.desnoyers@...ymtl.ca, jiayingz@...gle.com,
	mbligh@...gle.com, roland@...hat.com, fche@...hat.com
Subject: [PATCH 0/2] convert ftrace syscalls to TRACE_EVENT

hi,

I brought this up for as RFC before, and people were agreed in principal to
this idea. There are a number of advantages to having the syscall tracing
implemented as an event:

-can toggle on/off individual syscalls
-as a non-dedicated tracer, it can intermix with other tracing data
-by using tracepoints other infrastructures can tie into this implementation
-ability to print flag names and not just bits

In terms of the implementation, I've introduced a new 'trace_syscalls' enabled
flag in the <debugfs>/tracing/ directory to toggle the TIF_SYSCALL_FTRACE.
so: echo 1 > trace_syscalls to enable, echo 0 > trace_syscalls disable.

The implementation is still a bit rough, but I wanted to make sure I was on the 
right track before spending more time on this. I've showed an example of
printing out a flag using a 'clock_id_toname()' to macro. Steven's print_flags()
addition, should make pretty printing flag names much easier.

I believe that this current patch covers the functionality of the current ftrace
syscall tracer minus priting variable names and types, which I could add....thus,
I hope it can be merged in this state, and we can add pretty printing features
over time?

thanks,

-Jason

Jason Baron (2):
  -allow TP_printk() to have no args
  -syscall tracepoints

 arch/x86/kernel/ptrace.c        |    8 +-
 include/asm-generic/syscall.h   |    3 +
 include/trace/events/syscalls.h | 4202 +++++++++++++++++++++++++++++++++++++++
 include/trace/ftrace.h          |    2 +-
 include/trace/syscall.h         |    6 +
 kernel/trace/Makefile           |    1 -
 kernel/trace/trace.c            |  101 +
 kernel/trace/trace_syscalls.c   |  250 ---
 8 files changed, 4318 insertions(+), 255 deletions(-)
 create mode 100644 include/trace/events/syscalls.h
 delete mode 100644 kernel/trace/trace_syscalls.c

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