ftrace: trace_pipe_raw, blocking, and splice()

[Slava Pestov]

Hi ftrace users,

I notice that tracing_buffers_splice_read() has this comment in it
around line 3900:

/* TODO: block */

Was the original intention that reading from trace_pipe_raw with
tracing enabled should block if there is no data available, rather
than returning with end of file?

If so, I suggest adding a new trace_raw special file which behaves
like the current trace_pipe_raw (return 0 on EOF). Then we'd change
trace_pipe_raw to block on EOF.

Does this sound reasonable or is breaking APIs like this unacceptable?

Slava
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