Date: Wed, 17 Nov 2004 00:56:03 +0100
From: martin f krafft <madduck@madduck.net>
To: linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: checking if a job still uses the CPU
Message-ID: <20041116235603.GA8120@cirrus.madduck.net>
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I want to check a job periodically whether it still uses the CPU. If
not, I want to kill it. The latest solution I found is at

  http://madduck.net/~madduck/scratch/worker.sh
  http://madduck.net/~madduck/scratch/job.sh

worker.sh starts job.sh and polls /proc/$PID/stat:16 (the 16th
field: cutime) regularly. As soon as it stopped changing, the job is
killed.

This works fine as long as job.sh does not start jobs itself which
run longer than the period used to check in the worker (7 seconds in
my example). If job.sh's children take longer than 7 seconds to
complete, job.sh might get killed because the cutime value of
a process in /proc is only updated whenever a child returns.

Is there another way to achieve what I am trying to do? How can
I kill jobs that are idling and have not used the CPU in $DELAY
time?

Thanks,

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martin;              (greetings from the heart of the sun.)
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