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If !CONFIG_SCHED_TASK_TRACE, but CONFIG_SCHED_LITMUS_TRACEPOINT, then
we still need to define the tracepoint structures.
This patch should be integrated with the earlier sched_task_trace.c
patches during one of the next major rebasing efforts.
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This patch integrates LITMUS^RT's sched_trace_XXX() macros with
Linux's notion of tracepoints. This is useful to visualize schedules
in kernel shark and similar tools. Historically, LITMUS^RT's
sched_trace predates Linux's tracepoint infrastructure.
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This patch introduces the sched_trace infrastructure, which in
principle allows tracing the generated schedule. However, this patch
does not yet integrate the callbacks with the kernel.
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