mirror of https://github.com/mkerrisk/man-pages
cgroups.7: Relocate "Cgroups version 1 controllers" subsection
No text changes Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk
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man7/cgroups.7
228
man7/cgroups.7
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@ -228,6 +228,120 @@ in particular,
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.BR systemd (1)
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automatically creates such mount points.
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.\"
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.SS Cgroups version 1 controllers
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Each of the cgroups version 1 controllers is governed
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by a kernel configuration option (listed below).
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Additionally, the availability of the cgroups feature is governed by the
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.BR CONFIG_CGROUPS
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kernel configuration option.
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.TP
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.IR cpu " (since Linux 2.6.24; " \fBCONFIG_CGROUP_SCHED\fP )
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Cgroups can be guaranteed a minimum number of "CPU shares"
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when a system is busy.
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This does not limit a cgroup's CPU usage if the CPUs are not busy.
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Further information can be found in the kernel source file
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.IR Documentation/scheduler/sched\-bwc.txt .
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.TP
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.IR cpuacct " (since Linux 2.6.24; " \fBCONFIG_CGROUP_CPUACCT\fP )
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This provides accounting for CPU usage by groups of processes.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/cpuacct.txt .
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.TP
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.IR cpuset " (since Linux 2.6.24; " \fBCONFIG_CPUSETS\fP )
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This cgroup can be used to bind the processes in a cgroup to
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a specified set of CPUs and NUMA nodes.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/cpusets.txt .
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.TP
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.IR memory " (since Linux 2.6.25; " \fBCONFIG_MEMCG\fP )
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The memory controller supports reporting and limiting of process memory, kernel
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memory, and swap used by cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/memory.txt .
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.TP
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.IR devices " (since Linux 2.6.26; " \fBCONFIG_CGROUP_DEVICE\fP )
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This supports controlling which processes may create (mknod) devices as
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well as open them for reading or writing.
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The policies may be specified as whitelists and blacklists.
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Hierarchy is enforced, so new rules must not
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violate existing rules for the target or ancestor cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/devices.txt .
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.TP
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.IR freezer " (since Linux 2.6.28; " \fBCONFIG_CGROUP_FREEZER\fP )
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The
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.IR freezer
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cgroup can suspend and restore (resume) all processes in a cgroup.
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Freezing a cgroup
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.I /A
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also causes its children, for example, processes in
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.IR /A/B ,
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to be frozen.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/freezer-subsystem.txt .
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.TP
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.IR net_cls " (since Linux 2.6.29; " \fBCONFIG_CGROUP_NET_CLASSID\fP )
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This places a classid, specified for the cgroup, on network packets
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created by a cgroup.
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These classids can then be used in firewall rules,
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as well as used to shape traffic using
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.BR tc (8).
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This applies only to packets
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leaving the cgroup, not to traffic arriving at the cgroup.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/net_cls.txt .
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.TP
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.IR blkio " (since Linux 2.6.33; " \fBCONFIG_BLK_CGROUP\fP )
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The
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.I blkio
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cgroup controls and limits access to specified block devices by
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applying IO control in the form of throttling and upper limits against leaf
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nodes and intermediate nodes in the storage hierarchy.
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Two policies are available.
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The first is a proportional-weight time-based division
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of disk implemented with CFQ.
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This is in effect for leaf nodes using CFQ.
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The second is a throttling policy which specifies
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upper I/O rate limits on a device.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/blkio-controller.txt .
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.TP
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.IR perf_event " (since Linux 2.6.39; " \fBCONFIG_CGROUP_PERF\fP )
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This controller allows
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.I perf
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monitoring of the set of processes grouped in a cgroup.
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Further information can be found in the kernel source file
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.IR Documentation/perf-record.txt .
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.TP
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.IR net_prio " (since Linux 3.3; " \fBCONFIG_CGROUP_NET_PRIO\fP )
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This allows priorities to be specified, per network interface, for cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/net_prio.txt .
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.TP
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.IR hugetlb " (since Linux 3.5; " \fBCONFIG_CGROUP_HUGETLB\fP )
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This supports limiting the use of huge pages by cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/hugetlb.txt .
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.TP
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.IR pids " (since Linux 4.3; " \fBCONFIG_CGROUP_PIDS\fP )
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This controller permits limiting the number of process that may be created
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in a cgroup (and its descendants).
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/pids.txt .
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.\"
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.SS Creating cgroups and moving processes
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A cgroup filesystem initially contains a single root cgroup, '/',
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which all processes belong to.
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@ -363,120 +477,6 @@ For more changes, see the
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.I Documentation/cgroup-v2.txt
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file in the kernel source.
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.\"
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.SS Cgroups version 1 controllers
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Each of the cgroups version 1 controllers is governed
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by a kernel configuration option (listed below).
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Additionally, the availability of the cgroups feature is governed by the
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.BR CONFIG_CGROUPS
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kernel configuration option.
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.TP
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.IR cpu " (since Linux 2.6.24; " \fBCONFIG_CGROUP_SCHED\fP )
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Cgroups can be guaranteed a minimum number of "CPU shares"
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when a system is busy.
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This does not limit a cgroup's CPU usage if the CPUs are not busy.
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Further information can be found in the kernel source file
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.IR Documentation/scheduler/sched\-bwc.txt .
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.TP
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.IR cpuacct " (since Linux 2.6.24; " \fBCONFIG_CGROUP_CPUACCT\fP )
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This provides accounting for CPU usage by groups of processes.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/cpuacct.txt .
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.TP
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.IR cpuset " (since Linux 2.6.24; " \fBCONFIG_CPUSETS\fP )
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This cgroup can be used to bind the processes in a cgroup to
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a specified set of CPUs and NUMA nodes.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/cpusets.txt .
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.TP
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.IR memory " (since Linux 2.6.25; " \fBCONFIG_MEMCG\fP )
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The memory controller supports reporting and limiting of process memory, kernel
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memory, and swap used by cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup\-v1/memory.txt .
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.TP
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.IR devices " (since Linux 2.6.26; " \fBCONFIG_CGROUP_DEVICE\fP )
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This supports controlling which processes may create (mknod) devices as
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well as open them for reading or writing.
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The policies may be specified as whitelists and blacklists.
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Hierarchy is enforced, so new rules must not
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violate existing rules for the target or ancestor cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/devices.txt .
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.TP
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.IR freezer " (since Linux 2.6.28; " \fBCONFIG_CGROUP_FREEZER\fP )
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The
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.IR freezer
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cgroup can suspend and restore (resume) all processes in a cgroup.
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Freezing a cgroup
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.I /A
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also causes its children, for example, processes in
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.IR /A/B ,
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to be frozen.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/freezer-subsystem.txt .
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.TP
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.IR net_cls " (since Linux 2.6.29; " \fBCONFIG_CGROUP_NET_CLASSID\fP )
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This places a classid, specified for the cgroup, on network packets
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created by a cgroup.
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These classids can then be used in firewall rules,
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as well as used to shape traffic using
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.BR tc (8).
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This applies only to packets
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leaving the cgroup, not to traffic arriving at the cgroup.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/net_cls.txt .
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.TP
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.IR blkio " (since Linux 2.6.33; " \fBCONFIG_BLK_CGROUP\fP )
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The
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.I blkio
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cgroup controls and limits access to specified block devices by
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applying IO control in the form of throttling and upper limits against leaf
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nodes and intermediate nodes in the storage hierarchy.
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Two policies are available.
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The first is a proportional-weight time-based division
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of disk implemented with CFQ.
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This is in effect for leaf nodes using CFQ.
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The second is a throttling policy which specifies
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upper I/O rate limits on a device.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/blkio-controller.txt .
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.TP
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.IR perf_event " (since Linux 2.6.39; " \fBCONFIG_CGROUP_PERF\fP )
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This controller allows
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.I perf
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monitoring of the set of processes grouped in a cgroup.
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Further information can be found in the kernel source file
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.IR Documentation/perf-record.txt .
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.TP
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.IR net_prio " (since Linux 3.3; " \fBCONFIG_CGROUP_NET_PRIO\fP )
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This allows priorities to be specified, per network interface, for cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/net_prio.txt .
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.TP
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.IR hugetlb " (since Linux 3.5; " \fBCONFIG_CGROUP_HUGETLB\fP )
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This supports limiting the use of huge pages by cgroups.
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/hugetlb.txt .
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.TP
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.IR pids " (since Linux 4.3; " \fBCONFIG_CGROUP_PIDS\fP )
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This controller permits limiting the number of process that may be created
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in a cgroup (and its descendants).
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Further information can be found in the kernel source file
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.IR Documentation/cgroup-v1/pids.txt .
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.\"
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.SS Release notification
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A special file in each cgroup hierarchy,
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.IR release_agent ,
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