Messages in this thread | | | Date | Mon, 12 Jan 2009 09:09:02 +0800 | From | Li Zefan <> | Subject | Re: [PATCH] rcu: convert rcupreempt trace to seq file |
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>> 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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