linux-kernel - Re: [RFC PATCH 0/2] libtraceevent/perf: Add support for trace-cmd plugins

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Date:	Tue, 19 Jun 2012 10:40:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	David Ahern <dsahern@...il.com>, acme@...stprotocols.net,
	linux-kernel@...r.kernel.org, weisbec@...il.com,
	namhyung.kim@....com, mingo@...nel.org, peterz@...radead.org
Subject: Re: [RFC PATCH 0/2] libtraceevent/perf: Add support for trace-cmd plugins

On Mon, 18 Jun 2012 21:26:02 -0400, Steven Rostedt wrote:
> On Tue, 2012-06-19 at 10:11 +0900, Namhyung Kim wrote:
>
>> > trace-cmd report -N
>> > [...]
>> >              kvm-6172  [000] 14669573.114126: kvm_entry:            vcpu 0
>> >              kvm-6172  [000] 14669573.114127: kvm_exit:             [FAILED TO PARSE] exit_reason=30 guest_rip=0xffff357a isa=1 info1=217841672 info2=0
>> >              kvm-6172  [000] 14669573.114130: kvm_emulate_insn:     [FAILED TO PARSE] rip=4294915450 csbase=0 len=1 insn=ì[ÃWVS<89>Ã<89>Öš^Gu^Q^O^E flags=5 failed=0
>> >              kvm-6172  [000] 14669573.114130: kvm_pio:              pio_read at 0xcfc size 1 count 1
>> >              kvm-6172  [000] 14669573.114131: kvm_userspace_exit:   reason KVM_EXIT_IO (2)
>> >              kvm-6172  [000] 14669573.114134: kvm_entry:            vcpu 0
>> >
>> 
>> What I want to do is make it not to fail with default print_fmt (ie. w/o
>> plugin support). IOW using a plugin to improve things like above is
>> good, but not using it shouldn't break/fail anything. So I think fixing
>> the TP_printk is needed.
>
> I'm not sure its broken anymore per-say. As I just ran this without
> plugins (with the -N switch) and it doesn't break. It sends out some
> nasty warnings, but continues on its happy way with a warning that it
> '[FAILED TO PARSE]'. And some warnings in the beginning.
>
> But it doesn't totally fail. We could probably clean it up a bit too.
> What it does above is simply print out the raw data and lists the
> fields.
>
> The problem with modifying the TP_printk() is that this is also used by
> raw tracing (the /debug/tracing/trace file). Without using tools. The
> TP_printk() is really for that. The plugins is the way for tools to
> handle it.
>

Ok. Then how about using __print_hex() for __print_insn? AFAICS
ftrace_print_hex_seq() looks almost same as __print_insn() and as it's a
generic function we can add its handler in libtraceevnt.

Thanks,
Namhyung
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