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docs: Enhance memoryBacking/locked documentation
Mention the need to set memtune/hard_limit. https://bugzilla.redhat.com/show_bug.cgi?id=1035954
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<dt><code>locked</code></dt>
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<dt><code>locked</code></dt>
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<dd>When set and supported by the hypervisor, memory pages belonging
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<dd>When set and supported by the hypervisor, memory pages belonging
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to the domain will be locked in host's memory and the host will not
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to the domain will be locked in host's memory and the host will not
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be allowed to swap them out.
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be allowed to swap them out. For QEMU/KVM this requires
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<code>hard_limit</code> <a href="#elementsMemoryTuning">memory tunning</a>
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element to be used and set to the maximum memory configured for the
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domain plus any memory consumed by the QEMU process itself.
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<span class="since">Since 1.0.6</span></dd>
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<span class="since">Since 1.0.6</span></dd>
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</dl>
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</dl>
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