From: Wu Zhangjin <wuzj@xxxxxxxxxx> ftrace is a mcount based kernel tracing tool/framework, which is originally from RT_PREEMPT(http://rt.wiki.kernel.org). ftrace is short for function tracer, this is its original name, but now, it becomes a kernel tracing framework, lots of kernel tracers are built on it, such as irqoff tracer, wakeup tracer and so forth. these tracers are arch-independent(?), but some of them are arch-dependent, such as the original ftrace: function tracer, and dynamic function tracer, function graph tracer, and also, system call tracer. here is the mips porting of these four arch-dependent tracers, it will enable the following new kernel config options in linux-mips system. kernel hacking ---> Tracers --> [*] Kernel Function Tracer [*] Kernel Function Graph Tracer ... [*] Trace syscalls ... [*] enable/disable ftrace tracepoints dynamically in reality, because the high-precise timestamp getting function are arch-dependent, lots of the tracers are arch-dependent. the arch-dependent part is that: sched_clock, or we say ring_buffer_time_stamp or trace_clock_local function. to get high-precise timestamp, we can read the MIPS clock counter, but since it is only 32bit long, so, overflow should be handled carefully. read the following document, and play with it: Documentation/trace/ftrace.txt Wu Zhangjin (5): mips static function tracer support mips dynamic function tracer support mips function graph tracer support mips specific clock function to get precise timestamp mips specific system call tracer arch/mips/Kconfig | 7 + arch/mips/Makefile | 2 + arch/mips/include/asm/ftrace.h | 35 ++++- arch/mips/include/asm/ptrace.h | 2 + arch/mips/include/asm/reg.h | 5 + arch/mips/include/asm/syscall.h | 84 ++++++++ arch/mips/include/asm/thread_info.h | 5 +- arch/mips/kernel/Makefile | 13 ++ arch/mips/kernel/csrc-r4k.c | 2 +- arch/mips/kernel/entry.S | 2 +- arch/mips/kernel/ftrace.c | 360 +++++++++++++++++++++++++++++++++++ arch/mips/kernel/ftrace_clock.c | 77 ++++++++ arch/mips/kernel/mcount.S | 185 ++++++++++++++++++ arch/mips/kernel/mips_ksyms.c | 5 + arch/mips/kernel/ptrace.c | 14 ++- arch/mips/kernel/scall64-o32.S | 2 +- arch/mips/kernel/vmlinux.lds.S | 1 + kernel/trace/ring_buffer.c | 3 +- kernel/trace/trace_clock.c | 2 +- scripts/Makefile.build | 1 + scripts/recordmcount.pl | 32 +++- 21 files changed, 824 insertions(+), 15 deletions(-) create mode 100644 arch/mips/include/asm/syscall.h create mode 100644 arch/mips/kernel/ftrace.c create mode 100644 arch/mips/kernel/ftrace_clock.c create mode 100644 arch/mips/kernel/mcount.S
