linux-kernel - Re: systemtap broken by removal of register_timer

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Message-ID: <CAFTL4hxx_GHoa4uguSAtY0A=cC43qJPKvpqaoguS-WAjFj+HSw@mail.gmail.com>
Date:	Wed, 3 Apr 2013 14:49:53 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Mel Gorman <mgorman@...e.de>, Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	SystemTap <systemtap@...rceware.org>
Subject: Re: systemtap broken by removal of register_timer_hook

2013/4/3 Frank Ch. Eigler <fche@...hat.com>:
> Frederic Weisbecker <fweisbec@...il.com> writes:
>
>> [...]
>> Sometimes I don't mind keeping around code in the kernel for out of
>> tree users, depending on the case. But in this specific matter we have
>> more standard ways to do this kind of hook: kprobes, static
>> tracepoints. A tracepoint on the timer tick would be useful BTW, and
>> you could reuse it.
>
> Thanks for noticing!  IMO kprobes would be too heavyweight for this.
> A new static tracepoint would be fine, especially if it passes the
> same pt_regs* pointer as the former hook did.

Sounds good, would you like to propose a version? We are also
interested in a timer tick event tracepoint for dynticks debugging.

Thanks!
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