Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Technické informace stáhnout pdf (Strana 143)

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

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Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP BEGINNERS GUIDE Technické informace Strana 143