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

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Message-ID: <496A982E.3020103@cn.fujitsu.com>
Date:	Mon, 12 Jan 2009 09:09:02 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	paulmck@...ux.vnet.ibm.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

>> 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. :)

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