perf/ftrace: does PERF_EVENT_IOC_SET_FILTER serve any purpose?

[Vince Weaver]

Hello

I've been working on documenting the PERF_EVENT_IOC_SET_FILTER ioctl.

I've been trying for the past 2 days and have been unable to get any 
result except EINVAL.

Does anyone ever use this ioctl?  Does anyone know how to use this ioctl?

I understand it takes a pointer to a string that contains an 
"ftrace_filter" but the ftrace documentation is very confusing and it's 
unclear exactly what, if any, string is appropriate here.  I've even 
resorted to sprinkling printk()s throughout the parser code and still 
can't figure out what's going on.

Vince 
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