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docs: List cpuacct in controllers used by QEMU driver
The cpuacct controller is used to get cpu stats. Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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<p>
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The QEMU driver is capable of using the <code>cpuset</code>,
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<code>cpu</code>, <code>memory</code>, <code>blkio</code> and
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<code>devices</code> controllers. None of them are compulsory.
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If any controller is not mounted, the resource management APIs
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which use it will cease to operate. It is possible to explicitly
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turn off use of a controller, even when mounted, via the
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<code>/etc/libvirt/qemu.conf</code> configuration file.
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<code>cpu</code>, <code>cpuacct</code>, <code>memory</code>,
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<code>blkio</code> and <code>devices</code> controllers.
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None of them are compulsory. If any controller is not mounted,
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the resource management APIs which use it will cease to operate.
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It is possible to explicitly turn off use of a controller,
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even when mounted, via the <code>/etc/libvirt/qemu.conf</code>
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configuration file.
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</p>
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<p>
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