forked from mirrors/linux
a72232eabd
The Miscellaneous cgroup provides the resource limiting and tracking
mechanism for the scalar resources which cannot be abstracted like the
other cgroup resources. Controller is enabled by the CONFIG_CGROUP_MISC
config option.
A resource can be added to the controller via enum misc_res_type{} in
the include/linux/misc_cgroup.h file and the corresponding name via
misc_res_name[] in the kernel/cgroup/misc.c file. Provider of the
resource must set its capacity prior to using the resource by calling
misc_cg_set_capacity().
Once a capacity is set then the resource usage can be updated using
charge and uncharge APIs. All of the APIs to interact with misc
controller are in include/linux/misc_cgroup.h.
Miscellaneous controller provides 3 interface files. If two misc
resources (res_a and res_b) are registered then:
misc.capacity
A read-only flat-keyed file shown only in the root cgroup. It shows
miscellaneous scalar resources available on the platform along with
their quantities::
$ cat misc.capacity
res_a 50
res_b 10
misc.current
A read-only flat-keyed file shown in the non-root cgroups. It shows
the current usage of the resources in the cgroup and its children::
$ cat misc.current
res_a 3
res_b 0
misc.max
A read-write flat-keyed file shown in the non root cgroups. Allowed
maximum usage of the resources in the cgroup and its children.::
$ cat misc.max
res_a max
res_b 4
Limit can be set by::
# echo res_a 1 > misc.max
Limit can be set to max by::
# echo res_a max > misc.max
Limits can be set more than the capacity value in the misc.capacity
file.
Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
77 lines
1.2 KiB
C
77 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* List of cgroup subsystems.
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*
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* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
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*/
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/*
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* This file *must* be included with SUBSYS() defined.
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*/
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#if IS_ENABLED(CONFIG_CPUSETS)
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SUBSYS(cpuset)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_SCHED)
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SUBSYS(cpu)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_CPUACCT)
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SUBSYS(cpuacct)
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#endif
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#if IS_ENABLED(CONFIG_BLK_CGROUP)
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SUBSYS(io)
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#endif
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#if IS_ENABLED(CONFIG_MEMCG)
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SUBSYS(memory)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_DEVICE)
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SUBSYS(devices)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_FREEZER)
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SUBSYS(freezer)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_NET_CLASSID)
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SUBSYS(net_cls)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_PERF)
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SUBSYS(perf_event)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
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SUBSYS(net_prio)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_HUGETLB)
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SUBSYS(hugetlb)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_PIDS)
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SUBSYS(pids)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_RDMA)
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SUBSYS(rdma)
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#endif
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#if IS_ENABLED(CONFIG_CGROUP_MISC)
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SUBSYS(misc)
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#endif
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/*
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* The following subsystems are not supported on the default hierarchy.
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*/
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#if IS_ENABLED(CONFIG_CGROUP_DEBUG)
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SUBSYS(debug)
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#endif
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/*
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* DO NOT ADD ANY SUBSYSTEM WITHOUT EXPLICIT ACKS FROM CGROUP MAINTAINERS.
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*/
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