卖萌的弱渣

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Linux Cgroup Assign Dedicated CPUs for a VM

Platform

  • Host: Linux-3.10
  • Guest: Linux-3.10
  • Host CPU#: 8
  • Assigned CPUs: CPU #6

Configure Cgroup

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# Create another cgroup folder
mkdir /sys/fs/cgroup/cpuset/test

# You will get a bunch of files in test folder  after create the folder
# Assign the CPU 6 or you can replace 6 by "6-7" if you want more cpus assigned to the VM
echo 6 > /sys/fs/cgroup/cpuset/test/cpuset.cpus

# Assign the memory boundary
echo 0 > /sys/fs/cgroup/cpuset/test/cpuset.mems

Modify your VM boot script

Add qemu process# into cgroup.procs

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# Add the following line at the beginning
echo $$ > /sys/fs/cgroup/cpuset/test/cgroup.procs

# Add "exec" before qemu-system-x86_64 binary
exec qemu-system-x86_64 -enable-kvm -rtc base=utc,clock=vm,driftfix=none -bios bios.bin -device piix3-usb-uhci -soundhw ac97,hda -m 1024 -serial tcp::1223,server,nowait -net nic,macaddr=00:20:18:11:01:23,model=rtl8139,vlan=0 -net tap,vlan=0,script=/data/images/qemu-image/qemu-ifup0.sh -drive file=/data/images/qemu-image/opensuse-50G.raw,if=virtio,boot=on -name 23 -cpu core2duo -monitor stdio -smp sockets=1,cores=1,threads=1 -vnc :23

After that, run the boot script, you will see the qemu process number in /sys/fs/cgroup/cpuset/test/cgroup.procs and all threads in /sys/fs/cgroup/cpuset/test/tasks