10.2 Subsystems

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10.2 Subsystems

10.2.1 blkio Parameters
10.2.2 cpu Parameters
10.2.3 cpuacct Parameters
10.2.4 cpuset Parameters
10.2.5 devices Parameters
10.2.6 freezer Parameter
10.2.7 memory Parameters
10.2.8 net_cls Parameter

You control the access that cgroups have to system resources by specifying parameters to various kernel modules known as subsystems (or as resource controllers in some cgroups documentation).

The following table lists the subsystems that are provided with the cgroups package.

Subsystem	Description
`blkio`	Controls and reports block I/O operations. See Section 10.2.1, “blkio Parameters”. Note The `blkio` subsystem is enabled in the 2.6.39 UEK, but not in the 2.6.32 UEK.
`cpu`	Controls access to CPU resources. See Section 10.2.2, “cpu Parameters”.
`cpuacct`	Reports usage of CPU resources. See Section 10.2.3, “cpuacct Parameters”.
`cpuset`	Controls access to CPU cores and memory nodes (for systems with NUMA architectures). See Section 10.2.4, “cpuset Parameters”.
`devices`	Controls access to system devices. See Section 10.2.5, “devices Parameters”.
`freezer`	Suspends or resumes cgroup tasks. See Section 10.2.6, “freezer Parameter”.
`memory`	Controls access to memory resources, and reports on memory usage. See Section 10.2.7, “memory Parameters”.
`net_cls`	Tags network packets for use by network traffic control. See Section 10.2.8, “net_cls Parameter”.

You can set the following parameters for each subsystem.