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tracing/ftrace: make nop-tracer use polling wait for events on pipe
Impact: display events when they arrive Now that the events don't use wake_up() anymore, we need the nop tracer to poll waiting for events on the pipe. Especially because nop is useful to look at orphan traces types (traces types that don't rely on specific tracers) because it doesn't produce traces itself. And unlike other tracers that trigger specific traces periodically, nop triggers no traces by itself that can wake him. Signed-off-by: Frederic Weisbecker <firstname.lastname@example.org> Cc: Steven Rostedt <email@example.com> LKML-Reference: <firstname.lastname@example.org> Signed-off-by: Ingo Molnar <email@example.com>
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