Messages in this thread | | | Date | Sun, 11 Jan 2009 17:59:54 -0800 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH] rcu: convert rcupreempt trace to seq file |
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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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