33 lines
1.2 KiB
Plaintext
33 lines
1.2 KiB
Plaintext
CPU Accounting Controller
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The CPU accounting controller is used to group tasks using cgroups and
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account the CPU usage of these groups of tasks.
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The CPU accounting controller supports multi-hierarchy groups. An accounting
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group accumulates the CPU usage of all of its child groups and the tasks
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directly present in its group.
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Accounting groups can be created by first mounting the cgroup filesystem.
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# mkdir /cgroups
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# mount -t cgroup -ocpuacct none /cgroups
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With the above step, the initial or the parent accounting group
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becomes visible at /cgroups. At bootup, this group includes all the
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tasks in the system. /cgroups/tasks lists the tasks in this cgroup.
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/cgroups/cpuacct.usage gives the CPU time (in nanoseconds) obtained by
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this group which is essentially the CPU time obtained by all the tasks
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in the system.
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New accounting groups can be created under the parent group /cgroups.
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# cd /cgroups
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# mkdir g1
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# echo $$ > g1
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The above steps create a new group g1 and move the current shell
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process (bash) into it. CPU time consumed by this bash and its children
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can be obtained from g1/cpuacct.usage and the same is accumulated in
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/cgroups/cpuacct.usage also.
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