sched/rt: Add comments describing the RT IPI pull method

While looking into optimizations for the RT scheduler IPI logic, I realized
that the comments are lacking to describe it efficiently. It deserves a
lengthy description describing its design.

Signed-off-by: Steven Rostedt (VMware) <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Clark Williams <[email protected]>
Cc: Daniel Bristot de Oliveira <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mike Galbraith <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
[ Small typographical edits. ]
Signed-off-by: Ingo Molnar <[email protected]>

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