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This patch adds the main infrastructure for tracing overheads in
LITMUS^RT. It does not yet introduce any tracepoints into the kernel.
Add new overhead tracing event IDs
XCALL_{START,END} -- cross-CPU function calls
SEND_XCALL_{START,END} -- cross-CPU function call latency
SCHED_TIMER_{START,END} -- any additional, plugin-specific scheduling timer
TIMER_LATENCY -- latency of plugin-specific timer
Feather-Trace: Add macros for message-passing timestamps
Add timestamp tracing macros that reverse on which cores the
timestamps are recorded. This intended to reduce tracing contention if
some cores receive a lot of messages.
These macros are useful for plugins based on message-passing such as
the (non-mainline) G-EDF-MP.
Feather-Trace: convert timestamps to atomic_t - patch by Namhoon Kim (UNC)
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