[zfs-discuss] how to measure in kernel how much time one operation takes

[shri]

what call to be used in kernel to measure time taken for a operation if time 
quantum i s smaller than tick(frequency).
i tried using ddi_get_lbolt  at time t1 and t2.(at time t1 operation started 
and t2 it finished) but it always gives me zero(t2-t1).
 
 
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