linux-kernel - Re: [PATCH v2] ftrace: add a tracepoint for __raise_softirq

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Date:	Mon, 27 Apr 2009 11:32:14 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	mingo@...e.hu, fweisbec@...il.com, rostedt@...dmis.org,
	zhaolei@...fujitsu.com, laijs@...fujitsu.com,
	Li Zefan <lizf@...fujitsu.com>, tzanussi@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ftrace: add a tracepoint for
	__raise_softirq_irqoff()

* Xiao Guangrong (xiaoguangrong@...fujitsu.com) wrote:
> 
> 
> Mathieu Desnoyers 写道:
> > * Xiao Guangrong (xiaoguangrong@...fujitsu.com) 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. 
> >>
> >> Change log for v1 -> v2: 
> >> 1: Use TRACE_EVENT instead of DEFINE_TRACE
> >> 2: Move the tracepoint from raise_softirq_irqoff() to __raise_softirq_irqoff()
> >>
> > 
> > Hi Xiao,
> > 
> >> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> >> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
> >>
> >> ---
> >>  include/linux/interrupt.h  |    9 ++++++++-
> >>  include/trace/events/irq.h |   18 ++++++++++++++++++
> >>  2 files changed, 26 insertions(+), 1 deletions(-)
> >>
> >> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> >> index 912c52c..86bae89 100644
> >> --- a/include/linux/interrupt.h
> >> +++ b/include/linux/interrupt.h
> >> @@ -361,7 +361,14 @@ asmlinkage void do_softirq(void);
> >>  asmlinkage void __do_softirq(void);
> >>  extern void open_softirq(int nr, void (*action)(struct softirq_action *));
> >>  extern void softirq_init(void);
> >> -#define __raise_softirq_irqoff(nr) do { or_softirq_pending(1UL << (nr)); } while (0)
> >> +
> >> +#include <trace/events/irq.h>
> > 
> > Includes are usually at the beginning of the files.
> > 
> > Besides that, the patch looks good.
> > 
> Hi Mathieu: 
> I attempted to include <trace/events/irq.h> as your suggestion, but this results
> in a cross references: 
> struct softirq_action have been used in tarce/event/irq.h. 
> so I move “include <trace/events/irq.h>” in the front of __raise_softirq_irqoff. 

Steven : so, what's the current deal with

- #include <trace/irq.h> vs #include <trace/events/irq.h> ?

- Having header dependency in the ftrace-specific parts of the
  TRACE_EVENT macros ?

Mathieu

> 
> > Which tree is it for ? mainline 2.6.30-rc or Ingo's tip tree ?
> > 
> > Working with Ingo on -tip is probably better so the work can be
> > synchronized with Steven's work more easily.
> > 
> This patch is work with Ingo on -tip tree
> 
> Thank you!
> Xiao Guangrong
> > Thanks a lot !
> > 
> > Mathieu
> > 
> >> +static inline void __raise_softirq_irqoff(unsigned int nr)
> >> +{
> >> +	trace_irq_softirq_raise(nr);
> >> +	or_softirq_pending(1UL << nr);
> >> +}
> >> +
> >>  extern void raise_softirq_irqoff(unsigned int nr);
> >>  extern void raise_softirq(unsigned int nr);
> >>  extern void wakeup_softirqd(void);
> >> diff --git a/include/trace/events/irq.h b/include/trace/events/irq.h
> >> index 7686864..2628e08 100644
> >> --- a/include/trace/events/irq.h
> >> +++ b/include/trace/events/irq.h
> >> @@ -90,6 +90,24 @@ TRACE_EVENT(softirq_exit,
> >>  	TP_printk("softirq=%d action=%s", __entry->vec, __get_str(name))
> >>  );
> >>  
> >> +TRACE_EVENT(irq_softirq_raise,
> >> +
> >> +	TP_PROTO(unsigned int nr),
> >> +
> >> +	TP_ARGS(nr),
> >> +
> >> +	TP_STRUCT__entry(
> >> +		__field(	unsigned int,	nr	)
> >> +	),
> >> +
> >> +	TP_fast_assign(
> >> +		__entry->nr	= nr;
> >> +	),
> >> +
> >> +	TP_printk("softirq=%d action=%s is raised",
> >> +		__entry->nr, softirq_to_name[__entry->nr])
> >> +);
> >> +
> >>  #endif /*  _TRACE_IRQ_H */
> >>  
> >>  /* This part must be outside protection */
> >> -- 
> >> 1.6.1.2
> >>
> > 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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