linux-kernel - Re: [PATCH] rcu: convert rcupreempt trace to seq file

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Message-ID: <20090112015954.GC6864@linux.vnet.ibm.com>
Date:	Sun, 11 Jan 2009 17:59:54 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] rcu: convert rcupreempt trace to seq file

On Mon, Jan 12, 2009 at 09:09:02AM +0800, Li Zefan wrote:
> >> The debugfs and seqfile handling and handled in the statistical
> >> tracing engine.
> >>
> >> You just have to provide an iterator for your stat entries through two callbacks:
> >>
> >> _ stat_start() -> gives the first entry
> >> _ stat_next() -> iterates over the next entry
> >>
> >> And an output callback
> >>
> >> _ stat_show() -> print one entry from your stat list
> >>
> >> And two optional things:
> >>
> >> _ stat_cmp() -> compare two entries, useful if you want your stats to be sorted
> >> _ stat_headers() -> provide the first line in your stat file, typically to describe your columns
> >>
> >> The last thing you need is to give a name to your trace file.
> >> You will retrieve it into /debugfs/tracing/trace_stat/your_file_name as a current snapshot
> >> of your stats.
> >>
> >> It is currently used by the branch tracer, and by a pending patch for a new workqueue
> >> tracer which will provide you a simple example.
> >>
> >> If you have any question about how to use it, don't hesitate to ask.
> > 
> > Li Zefan, is this something you would be willing to try?  Sounds like
> > it might be a good addition.
> 
> Sure, I'll try. :)

Very cool!  I look forward to seeing it!!!

							Thanx, Paul
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