Re: [PATCH] ftrace: add an fsync tracer

[Frédéric Weisbecker]

2008/11/6 Peter Zijlstra <peterz@xxxxxxxxxxxxx>:
> Please work on getting something like a syscall tracer, or lttng like
> event tracer.
>
> Both of those should be able to find such badness, but are also able to
> diagnose many more issues.


BTW. Why not adding a kind of tracer_ctrl callback on the
struct_tracer? This way we could add some custom
options on the iter_ctrl file that could be transmitted to the current_tracer.

For example considering a syscall tracer.
By default if we don't write anything on iter_ctrl, it traces all
syscalls. But if we do:
echo fsync > iter_ctrl
Only the fsync call will be traced (unused tracepoint would be disabled).

A tracer just have to implement this new callback and transmit the
options it support.
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