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![Vipin Sharma](/assets/img/avatar_default.png)
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>
9 lines
325 B
Makefile
9 lines
325 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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obj-y := cgroup.o rstat.o namespace.o cgroup-v1.o freezer.o
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obj-$(CONFIG_CGROUP_FREEZER) += legacy_freezer.o
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obj-$(CONFIG_CGROUP_PIDS) += pids.o
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obj-$(CONFIG_CGROUP_RDMA) += rdma.o
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obj-$(CONFIG_CPUSETS) += cpuset.o
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obj-$(CONFIG_CGROUP_MISC) += misc.o
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obj-$(CONFIG_CGROUP_DEBUG) += debug.o
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