msgpassing cpu time and sac output

A little curiosity about ‘sac’ utility statistics.

Suppose there’s 2 processes, A and B, at different priorities. A makes a
simple Send() to B, and B a simple Receive()+Reply() back to A.

The microkernel takes TA us to copy the send buffer data from A to B,
and TB us to copy the reply buffer data from B to A.

My question is: at which priority gets the TA and TB counted in the
‘sac’ output?


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