63 lines
1.7 KiB
Text
63 lines
1.7 KiB
Text
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#!/bin/sh
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#
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# This is a tricky script to understand. When run in M5, it creates
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# a checkpoint after Linux boot up, but before any benchmarks have
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# been run. By playing around with environment variables, we can
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# detect whether the checkpoint has been taken.
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# - If the checkpoint hasn't been taken, the script allows M5 to checkpoint the system,
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# re-read this script into a new tmp file, and re-run it. On the
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# second execution of this script (checkpoint has been taken), the
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# environment variable is already set, so the script will exit the
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# simulation
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# - When we restore the simulation from a checkpoint, we can
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# specify a new script for M5 to execute in the full-system simulation,
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# and it will be executed as if a checkpoint had just been taken.
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#
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# Author:
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# Joel Hestness, hestness@cs.utexas.edu
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# while at AMD Research and Advanced Development Lab
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# Date:
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# 10/5/2010
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#
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# Test if the RUNSCRIPT_VAR environment variable is already set
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if [ "${RUNSCRIPT_VAR+set}" != set ]
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then
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# Signal our future self that it's safe to continue
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export RUNSCRIPT_VAR=1
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else
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# We've already executed once, so we should exit
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/sbin/m5 exit
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fi
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# Checkpoint the first execution
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echo "Checkpointing simulation..."
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/sbin/m5 checkpoint
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# Test if we previously okayed ourselves to run this script
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if [ "$RUNSCRIPT_VAR" -eq 1 ]
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then
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# Signal our future self not to recurse infinitely
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export RUNSCRIPT_VAR=2
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# Read the script for the checkpoint restored execution
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echo "Loading new script..."
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/sbin/m5 readfile > /tmp/runscript
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chmod 755 /tmp/runscript
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# Execute the new runscript
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if [ -s /tmp/runscript ]
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then
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exec /tmp/runscript
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else
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echo "Script not specified. Dropping into shell..."
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/bin/bash
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fi
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fi
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echo "Fell through script. Exiting..."
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/sbin/m5 exit
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