On 11/15/2010 07:11 PM, Steven Rostedt wrote:
On Mon, 2010-11-15 at 19:09 +0200, Avi Kivity wrote:
> trace-cmd doesn't like trace_printk():
>
> <...>-23775 [000] 26343.288803: kvm_emulate_insn: 0:f14e9: rep insb
> <...>-23775 [000] 26343.288804: bprint: x86_emulate_insn :
> (NO FORMAT FOUND at ffffffffa0131460)
>
> <...>-23775 [000] 26343.288807: bprint: x86_emulate_insn :
> (NO FORMAT FOUND at ffffffffa0131460)
>
> any chance to get it to work with custom printks?
>
> I guess I should use 'perf probe' instead.
>
Which kernel are you using, and/or which trace-cmd? It works fine for
me. But there has been bugs with older kernels and older trace-cmds.
kernel 2.6.37-rc1+, I think latest trace-cmd; will retry.
Meanwhile 'perf probe' grumbles on anonymous unions:
src(tyep:operand) has no member val.
Failed to find 'ctxt' in this function.
Error: Failed to add events. (-22)
For
--add 'insb=arch/x86/kvm/emulate.c:3369 insn=ctxt->decode.b
bytes=ctxt->decode.dst.bytes port=ctxt->decode.src.val
cx=ctxt->decode.regs[1] di=ctxt->decode.regs[7]
addr=ctxt->decode.dst.mem.addr cpos=ctxt->decode.io_read.pos
cend=ctxt->decode.io_read.end'
(ctxt->decode.src.val is a member of an anonymous union in
ctxt->decode.src, which is of type 'struct operand')
--
error compiling committee.c: too many arguments to function
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