NAME

       pip_stress - test priority inheritance between processes

SYNOPSIS

       pip_stress

DESCRIPTION

       pip_stress creates a priority inversion using three processes and a priority inheritance mutex shared via
       shared memory.  All three processes are bound to run on the  same  cpu.   The  process  with  the  lowest
       priority  holds  a  mutex and is prempted by the medium priority process that just runs an infinite loop.
       The third process with the highest priority tries to grab the mutex that is hold by the low prio process.
       As  a  priority  inheritance  mutex  is  used  the  low priority process lends the high priority process'
       priority to unlock the mutex and so stops the medium priority process blocking the high priority one.

       pip_stress doesn't take any options and quits as soon as the priority inversion is resolved which  should
       happen instantly.

AUTHOR

       pip_stress was written by John Kacur <jkacur@redhat.com>.

                                                   2011-06-24                                      pip_stress(8)