25.2. Distribution models of system sources

You can distribute the resource by adding up the weights of all sub-groups and giving each sub-group the fraction matching its ratio against the sum.

For example, if you have 10 cgroups, each with weight of value 100, the sum is 1000. Each cgroup receives one tenth of the resource.

Weight is usually used to distribute stateless resources. For example the CPUWeight= option is an implementation of this resource distribution model.

A cgroup can consume up to the configured amount of the resource. The sum of sub-group limits can exceed the limit of the parent cgroup. Therefore it is possible to overcommit resources in this model.

For example the MemoryMax= option is an implementation of this resource distribution model.

You can set up a protected amount of a resource for a cgroup. If the resource usage is below the protection boundary, the kernel will try not to penalize this cgroup in favor of other cgroups that compete for the same resource. An overcommit is also possible.

For example the MemoryLow= option is an implementation of this resource distribution model.

A setting for resource control configuration.

For example, you can configure CPU resource with options like CPUAccounting=, or CPUQuota=. Similarly, you can configure memory or I/O resources with options like AllowedMemoryNodes= and IOAccounting=.