System information

Kernel Control Groups 129
mount -t cgroup -ocpuset cpuset /sys/fs/cgroup/cpuset
cd /sys/fs/cgroup/cpuset
mkdir Charlie
cd Charlie
# List of CPUs in this cpuset:
echo 2-3 > cpuset.cpus
# List of memory nodes in this cpuset:
echo 1 > cpuset.mems
echo $$ > tasks
# The subshell 'sh' is now running in cpuset Charlie
# The next line should display '/Charlie'
cat /proc/self/cpuset
3 Remove the cpuset using shell commands:
rmdir /sys/fs/cgroup/cpuset/Charlie
This fails as long as this cpuset is in use. First, you must remove the inside cpusets
or tasks (processes) that belong to it. Check it with:
cat /sys/fs/cgroup/cpuset/Charlie/tasks
For background information and additional configuration flags, see /usr/src/
linux/Documentation/cgroups/cpusets.txt.
With the cset tool, proceed as follows:
# Determine the number of CPUs and memory nodes
cset set --list
# Creating the cpuset hierarchy
cset set --cpu=2-3 --mem=1 --set=Charlie
# Starting processes in a cpuset
cset proc --set Charlie --exec -- stress -c 1 &
# Moving existing processes to a cpuset
cset proc --move --pid PID --toset=Charlie
# List task in a cpuset
cset proc --list --set Charlie
# Removing a cpuset
cset set --destroy Charlie
10.4.4 Example: cgroups
Using shell commands, proceed as follows:
1 Create the cgroups hierarchy:
mount -t cgroup cgroup /sys/fs/cgroup