linux-kernel - Re: [PATCH v4] ftrace: add a tracepoint for __raise_softirq

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Date:	Mon, 18 May 2009 11:06:25 +0800
From:	"Zhaolei" <zhaolei@...fujitsu.com>
To:	<mingo@...e.hu>
Cc:	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	<linux-kernel@...r.kernel.org>, <fweisbec@...il.com>,
	<laijs@...fujitsu.com>, "Li Zefan" <lizf@...fujitsu.com>,
	"Xiao Guangrong" <xiaoguangrong@...fujitsu.com>
Subject: Re: [PATCH v4] ftrace: add a tracepoint for __raise_softirq_irqoff()

* From: "Xiao Guangrong" <xiaoguangrong@...fujitsu.com>
> Steven Rostedt wrote:
>> On Thu, 14 May 2009, Mathieu Desnoyers wrote:
>>>> From: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
>>>>
>>>> This patch is modified from Mathieu Desnoyers' patch. The original patch
>>>> can be found here: 
>>>> http://marc.info/?l=linux-kernel&m=123791201816245&w=2
>>>> This tracepoint can trace the time stamp when softirq action is raised. 
>>>>
>>>> Changelog for v1 -> v2: 
>>>> 1: Use TRACE_EVENT instead of DEFINE_TRACE
>>>> 2: Move the tracepoint from raise_softirq_irqoff() to
>>>>    __raise_softirq_irqoff()
>>>>
>>>> Changelog for v2 -> v3: 
>>>> Move the definition of __raise_softifq_irqoff() to .c file when
>>>> CONFIG_TRACEPOINTS is enabled, to avoid recursive includes
>>>>
>>>> Changelog for v3 -> v4: 
>>>> 1: Come back to v2, and use forward declarations to avoid
>>>>    recursive includes as Mathieu's suggestion
>>>> 2: Modifiy the tracepoint name
>>>> 3: Add comments for this tracepoint
>>>>
>>> This is a step in the right direction, but please see my email to Lai
>>> about the fact that this assumes correct and undocumented include
>>> dependencies in kernel/trace/events.c. Not explicitely stating the
>>> include dependencies is a build error waiting to happen.
>>>
>>> Including interrupt.h under a ifdef would allow keeping track of
>>> TRACE_EVENT specific build dependencies neatly on a per header basis.
>> 
>> This is all moot, the events.c file no longer exists and as not an issue.
>> 
> 
> As Steve's says, use ftrace in ftrace.h not in events.c now. 
> So, this mistake does not exist.
> Dose this patch has other error? I expect for your views.
> 
> Thanks for your review, is great help to me. ;-) 

Hello,

It seems Mathieu has no other comments on this patch now.
Ingo, what is your opinion on this patch?

Thanks
Zhaolei

> 
>> -- Steve
>> 
>> 
>> 
>