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add document of cgroup/CPUIdle
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man/systemd.resource-control.xml

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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>CPUIdle=</varname></term>
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<listitem>
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<para>Assign the idle scheduling strategy to the processes executed, both the unified and
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legacy control group is effiecient.
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this options only take 1 or 0 currently, default to 0.</para>
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<itemizedlist>
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<listitem>
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<para>1: SCHED_IDLE, which means it is configured with mininum sched weight and could be preempt by other non-idle processes in the same level of task group</para>
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</listitem>
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<listitem>
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<para>0: default behavior</para>
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</listitem>
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</itemizedlist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>CPUQuota=</varname></term>
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