Event tracing support on m68k

Event tracing support on m68k

[Ezequiel Garcia]

Hi,

While trying to trace an m68k (without MMU) platform, I discovered
there's no "TRACING"
option on m68k menuconfig.

* Am I doing anything wrong? Is there no tracing support on m68k?

Now, I understand that function trace needs some kind of hardware support.
However, since trace events (like kmem events) look like some software trick,
I expected to get those architecture-wide.

* So, trace events also need hardware support? They aren't software-only stuff?

Any clarification will be most welcome!
Thanks!

    Ezequiel

Re: Event tracing support on m68k

[Andreas Schwab]

Ezequiel Garcia <elezegarcia@gmail.com> writes:

> While trying to trace an m68k (without MMU) platform, I discovered
> there's no "TRACING"
> option on m68k menuconfig.
>
> * Am I doing anything wrong? Is there no tracing support on m68k?

>From Documentation/trace/ftrace-design.txt:

Prerequisites
-------------

Ftrace relies on these features being implemented:
 STACKTRACE_SUPPORT - implement save_stack_trace()
 TRACE_IRQFLAGS_SUPPORT - implement include/asm/irqflags.h

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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Re: Event tracing support on m68k

[Ezequiel Garcia]

On Mon, Oct 22, 2012 at 11:36 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> Ezequiel Garcia <elezegarcia@gmail.com> writes:
>
>> While trying to trace an m68k (without MMU) platform, I discovered
>> there's no "TRACING"
>> option on m68k menuconfig.
>>
>> * Am I doing anything wrong? Is there no tracing support on m68k?
>
> From Documentation/trace/ftrace-design.txt:
>
> Prerequisites
> -------------
>
> Ftrace relies on these features being implemented:
>  STACKTRACE_SUPPORT - implement save_stack_trace()
>  TRACE_IRQFLAGS_SUPPORT - implement include/asm/irqflags.h
>

Yeah, I read that too. Perhaps the real question should be:

Is it just not implemented on this platform or is there no way to implement it?
(and is it a wanted feature by the m68k users?)

But, I'm still confused on why this stuff is needed to get trace events.

Thanks!

    Ezequiel
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Re: Event tracing support on m68k

[Andreas Schwab]

Ezequiel Garcia <elezegarcia@gmail.com> writes:

> Is it just not implemented on this platform or is there no way to implement it?
> (and is it a wanted feature by the m68k users?)

Probably nobody has looked into it yet.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Event tracing support on m68k

[Greg Ungerer]

On 23/10/12 01:26, Andreas Schwab wrote:
> Ezequiel Garcia <elezegarcia@gmail.com> writes:
>> Is it just not implemented on this platform or is there no way to implement it?
>> (and is it a wanted feature by the m68k users?)
>
> Probably nobody has looked into it yet.

That would be my guess.

Regards
Greg


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