Attachment 577965 Details for Bug 813228 – pm-utils hook to preserve cpuset affinity across suspend/hibernate

pm-utils hook to preserve cpuset affinity across suspend/hibernate

cpusets.sh (text/plain), 2.28 KB, created by Daniel Berrangé on 2012-04-17 09:30:46 UTC

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Creator: Daniel Berrangé

Created: 2012-04-17 09:30:46 UTC

Size: 2.28 KB

patch

obsolete

>Note: Put this script in /usr/<lib or lib64>/pm-utils/sleep.d by prefixing
>appropriate number (eg: /usr/lib64/pm-utils/sleep.d/02cpusets.sh). And then
>give execute permissions to the script. It will save all the cpusets' cpu
>configuration before suspend and restore them after resume. This is a
>workaround until the problem gets fixed in the kernel. 
>
>cpusets.sh
>----
>
>#! /bin/bash
># Script to save and restore the cpusets' cpu configuration after a
># suspend/resume cycle.
># This is a workaround for a Linux kernel bug which results in cpusets
># being reduced to a single cpu (boot cpu) after a suspend/resume
># cycle.
>#
># Author: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
># 16 March 2012
>#
>
>save_cpusets()
>{
>	rm -f saved_cpusets.txt
>
>	# Check if cpusets are mounted separately
>	dir=`mount | grep cpuset`
>	if [ -z "$dir" ]; then
>		# Check if atleast cgroup is mounted
>	        dir=`mount | grep cgroup`
>		if [ -z "$dir" ]; then
>			#Nothing to be done, as cpusets are not being used
>			exit 0
>		fi
>	fi
>
>	dir=`mount | grep cpuset | cut -d' ' -f3`
>
>	# Omit the root cpuset (using mindepth parameter) since it is read-only
>	# (and will be restored properly after resume by the kernel itself).
>
>	# Sorting is necessary because otherwise the hierarchy is not preserved
>	# and restore_cpusets() will have trouble restoring the cpusets.
>	# This is because of the rule that a child cpuset cannot have a cpu that
>	# is not present in its parent cpuset.
>
>	find $dir -mindepth 2 -name "cpuset.cpus" -type f -print | sort > saved_path.txt
>
>	# Delete saved_path.txt if it is NULL
>	val=`cat saved_path.txt`
>	if [ -z "$val" ]; then
>		rm -f saved_path.txt
>		exit 0
>	fi
>
>	for cpuset in `cat saved_path.txt`
>	do
>		cat $cpuset >> saved_cpusets.txt
>	done
>
>	paste saved_path.txt saved_cpusets.txt > temp.txt
>	mv temp.txt saved_cpusets.txt
>	rm -f saved_path.txt
>}
>
>restore_cpusets()
>{
>	if [ ! -f saved_cpusets.txt ]; then
>		# Nothing to be done
>		exit 0
>	fi
>
>	while read line
>	do
>		cpuset_path=`echo $line | cut -d' ' -f1`
>		value=`echo $line | cut -d' ' -f2`
>		echo "$value" > $cpuset_path
>	done < saved_cpusets.txt
>
>	rm -f saved_cpusets.txt
>}
>
>case "$1" in
>        suspend|hibernate)
>                save_cpusets
>                ;;
>        resume|thaw)
>                restore_cpusets
>                ;;
>        *)
>                ;;
>esac
>
>exit $?
>

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Attachments on bug 813228: 577965 | 578035