From: Wu Zhangjin <wuzhangjin@xxxxxxxxx>
This patchset adds ftrace support for MIPS, including static ftracer, dynamic
ftracer and function graph tracer, and also, a MIPS specific
trace_clock_local() function is added to get high precision timestamp.
Differ from the v7, This v8 revision incoporates the feedbacks from David, Ralf
and Maciej. thanks goes to them.
o Remove the needless -mlong-calls introduced in the old "tracing: add static
function tracer support for MIPS"
static ftracer already support module tracing for there is an existing
-mlong-calls for modules in arch/mips/Makefile:
MODFLAGS += -mlong-calls
o Make dynamic ftracer work without -mlong-calls.
Now, we need to consider the kernel and module respectively, the kernel part
is without -mlong-calls, the module part is with -mlong-calls.
In scripts/recordmcount.pl, we need to get the right offset, and in
arch/mips/kernel/ftrace.c, we need to replace the right instruction in
ftrace_make_nop() & ftrace_make_call().
And what I must mention here:
I. we will not really get the offset of calling to _mcount in
scripts/recordmcount.pl for the modules with -mlong-calls, we get the
offset of "lui,v1,hi16_mcount".
II. and in the ftrace_make_nop(), we not really replace the instruction by a
nop, but by a "b 1f" instead. so, ftrace_make_nop not mean its original
meaning.
o Make function graph tracer work without -mlong-calls
'Cause -pg with and without -mlong-calls generate different number of
instructions, we need to consider this and move the searching pointer to
the right position in ftrace_get_parent_addr().
All of the updates have been tested with gcc-4.4/binutils-2.19.1 and
gcc-4.5(including David's mcount-ra-address)/binutils-2.20 on a YeeLoong
netbook. and the source code have been pushed into:
git://dev.lemote.com/rt4ls.git linux-mips/dev/ftrace-upstream
BTW: What about this revision? Hope it is the last revision from me, but I can
not promise for the kernel developers are always "rigorous": they need the best
solution ;) So, more feedbacks are welcome!
Thanks & Regards,
Wu Zhangjin
Wu Zhangjin (16):
tracing: convert trace_clock_local() as weak function
tracing: add mips_timecounter_read() for MIPS
tracing: add MIPS specific trace_clock_local()
tracing: add static function tracer support for MIPS
tracing: enable HAVE_FUNCTION_TRACE_MCOUNT_TEST for MIPS
tracing: add an endian argument to scripts/recordmcount.pl
tracing: add dynamic function tracer support for MIPS
tracing: add IRQENTRY_EXIT section for MIPS
tracing: define a new __time_notrace annotation flag
tracing: not trace the timecounter_read* in kernel/time/clocksource.c
tracing: not trace mips_timecounter_read() for MIPS
tracing: add function graph tracer support for MIPS
tracing: add dynamic function graph tracer for MIPS
tracing: make ftrace for MIPS work without -fno-omit-frame-pointer
tracing: reserve $12(t0) for mcount-ra-address of gcc 4.5
tracing: make function graph tracer work with -mmcount-ra-address
arch/mips/Kconfig | 5 +
arch/mips/Makefile | 9 ++
arch/mips/include/asm/ftrace.h | 97 ++++++++++++++-
arch/mips/include/asm/irq.h | 29 +----
arch/mips/include/asm/time.h | 20 +++
arch/mips/kernel/Makefile | 9 ++
arch/mips/kernel/csrc-r4k.c | 42 ++++++
arch/mips/kernel/ftrace.c | 275 ++++++++++++++++++++++++++++++++++++++++
arch/mips/kernel/irq.c | 30 +++++
arch/mips/kernel/mcount.S | 189 +++++++++++++++++++++++++++
arch/mips/kernel/mips_ksyms.c | 5 +
arch/mips/kernel/smp.c | 3 +-
arch/mips/kernel/smtc.c | 21 ++-
arch/mips/kernel/time.c | 2 +
arch/mips/kernel/trace_clock.c | 33 +++++
arch/mips/kernel/vmlinux.lds.S | 1 +
arch/mips/sgi-ip22/ip22-int.c | 3 +-
arch/mips/sgi-ip22/ip22-time.c | 3 +-
include/linux/ftrace.h | 12 ++
kernel/time/clocksource.c | 5 +-
kernel/trace/trace_clock.c | 2 +-
scripts/Makefile.build | 1 +
scripts/recordmcount.pl | 60 ++++++++-
23 files changed, 812 insertions(+), 44 deletions(-)
create mode 100644 arch/mips/kernel/ftrace.c
create mode 100644 arch/mips/kernel/mcount.S
create mode 100644 arch/mips/kernel/trace_clock.c
