File: tcp_init_cwnd.stp

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#! /usr/bin/stap -g

# Based upon http://blog.yufeng.info/archives/1173, bring the goodness
# of linux commit 442b9635c5 to the pre-2.6.39 masses.

probe kernel.function("tcp_init_cwnd").return
{
  r = $return
  if (r > 0 && r < 10) 
    $return = 10;
  counts[r,$return] <<< 1
}

global counts  # will be automatically summarized at shutdown