Linux cgroups: Difference between revisions

From NovaOrdis Knowledge Base
Jump to navigation Jump to search
No edit summary
No edit summary
Line 3: Line 3:
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/resource_management_guide/ch01
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/resource_management_guide/ch01
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/resource_management_guide/chap-introduction_to_control_groups
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/resource_management_guide/chap-introduction_to_control_groups
* https://www.kernel.org/doc/Documentation/cgroup-v1/cgroups.txt
* https://en.wikipedia.org/wiki/Cgroups
* https://en.wikipedia.org/wiki/Cgroups
* http://man7.org/linux/man-pages/man7/cgroups.7.html
* http://man7.org/linux/man-pages/man7/cgroups.7.html

Revision as of 19:41, 6 February 2018

External

Internal

Overview

cgroups is a Linux kernel feature that allows allocation of resources (CPU, system memory, network bandwidth, or a combination of these) among user-defined groups of processes running on the system.

cgroups are organized hierarchically, child cgroups inheriting certain attributes from their parent group. Many different hierarchies of cgroups can exist simultaneously on a system. Each hierarchy is attached to one or more subsystem, where a subsystem represents a single resource like CPU time or memory.

cgroups can be configured via the cgconfig service.

cgroups Subsystems

  • blkio - sets limits on input/output access from and to block devices.
  • cpu - uses the scheduler to provide cgroup tasks access to the CPU.
  • cpuacct - generates automatic reports on CPU resources.
  • cpuset - assigns individual CPUs and memory nodes to tasks in a cgroup.
  • devices.
  • freezer.
  • memory.
  • net_cls - tags network packets with a tag identifier (classid) that allow the Linux traffic controller (tc) to identify packets.
  • net_prio.
  • ns - the namespace subsystem.
  • perf_event.

Operations

The recommended location for cgroup hierarchies:

/sys/fs/cgroup