Messages in this thread | | | Date | Sat, 6 Sep 2008 13:39:55 +0200 | From | "Frédéric Weisbecker" <> | Subject | Re: [Patch] Tracing/ftrace: Adds a marker to allow user comments |
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2008/9/4 Steven Rostedt <rostedt@goodmis.org>:
> For logdev (my pet project from way back, and the latest ftrace is based > on), I had a CUSTOM type. The API allowed to register a callback to a > type, and it would associate that type to some number (descriptor) and > pass that number back to you. Then you could use this number to write to > the buffer using the CUSTOM type and registered number. On output, when a > CUSTOM type is detected, it would read the custom.id (the number) and > search for any registered callbacks to handle the entry. > > This probably would not be too difficult to implement. Especially since it > is already implemented in logdev. > (see http://rostedt.homelinux.com/logdev/) > > -- Steve
Why not. It is a way for a tracer to handle output for any type of entries. But will this feature really be used for other special types than TRACE_PRINT? I'm not sure... If it is not the case, the Pekka's solution seems to me far more simple.
But actually I don't know the needs of others tracers...
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