How to measure time spent in context switch

[Manavendra Nath Manav]

How to measure time spent in context switch in Linux i.e. the time the
application stays suspended while the kernel is doing something else. I
don't want to use any profiling tools. What approach should I take to write
my own C code, which can also run as kernel module if required, to measure
time spent accurately. Will it also require to modify the scheduler code?
Does /proc gives any statistics in this regard?

Ref:
http://stackoverflow.com/questions/2368384/write-a-c-program-to-measure-time-spent-in-context-switch-in-linux-os

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Manavendra Nath Manav
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