MIPS: Tracing: Reduce the overhead of dynamic Function Tracer

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With the help of uasm this patch encodes the instructions of the dynamic
function tracer in ftrace_dyn_arch_init() when initializing it.

As a result we can remove the dynamic encoding of instructions in
ftrace_make_nop()/call(), ftrace_enable_ftrace_graph_caller() and remove
the macro jump_insn_encode() and at last this reduce the overhead of
dynamic Function Tracer.  This also is cleaner.

Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips <linux-mips@linux-mips.org>
Cc: David Daney <david.s.daney@gmail.com>
Patchwork: http://patchwork.linux-mips.org/patch/1230/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

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Wu Zhangjin 2010-05-14 19:08:32 +08:00 • committed by Ralf Baechle

parent 4d6829f92a

commit e424054000

1 changed files with 49 additions and 44 deletions

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arch/mips/kernel/ftrace.c

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