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Conflicts: arch/x86/kernel/io_apic.c kernel/sched.c kernel/sched_stats.h
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CPU Accounting Controller | ||
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The CPU accounting controller is used to group tasks using cgroups and | ||
account the CPU usage of these groups of tasks. | ||
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The CPU accounting controller supports multi-hierarchy groups. An accounting | ||
group accumulates the CPU usage of all of its child groups and the tasks | ||
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 | ||
# mount -t cgroup -ocpuacct none /cgroups | ||
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With the above step, the initial or the parent accounting group | ||
becomes visible at /cgroups. At bootup, this group includes all the | ||
tasks in the system. /cgroups/tasks lists the tasks in this cgroup. | ||
/cgroups/cpuacct.usage gives the CPU time (in nanoseconds) obtained by | ||
this group which is essentially the CPU time obtained by all the tasks | ||
in the system. | ||
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New accounting groups can be created under the parent group /cgroups. | ||
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# cd /cgroups | ||
# mkdir g1 | ||
# echo $$ > g1 | ||
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The above steps create a new group g1 and move the current shell | ||
process (bash) into it. CPU time consumed by this bash and its children | ||
can be obtained from g1/cpuacct.usage and the same is accumulated in | ||
/cgroups/cpuacct.usage also. |
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