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docs: Clarify restrictive numatune mode

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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2185184
Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Martin Kletzander 2023-04-20 08:51:14 +02:00
parent 383caddea1
commit 2f4f381871
1 changed files with 10 additions and 1 deletions
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docs/formatdomain.rst
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@ -1207,7 +1207,10 @@ NUMA Node Tuning
'restrictive', defaults to 'strict'. The value 'restrictive' specifies
using system default policy and only cgroups is used to restrict the
memory nodes, and it requires setting mode to 'restrictive' in ``memnode``
elements. Attribute ``nodeset`` specifies the NUMA nodes, using the same
elements (see quirk below). This exists solely for the purpose of being able
to request movement of such memory for a running domain using ``virsh
numatune`` or ``virDomainSetNumaParameters` and is not guaranteed to happen.
Attribute ``nodeset`` specifies the NUMA nodes, using the same
syntax as attribute ``cpuset`` of element ``vcpu``. Attribute ``placement`` (
:since:`since 0.9.12` ) can be used to indicate the memory placement mode for
domain process, its value can be either "static" or "auto", defaults to
@ -1227,6 +1230,12 @@ NUMA Node Tuning
addresses guest NUMA node for which the settings are applied. Attributes
``mode`` and ``nodeset`` have the same meaning and syntax as in ``memory``
element. This setting is not compatible with automatic placement.
Note that for ``memnode`` this will only guide the memory access for the vCPU
threads or similar mechanism and is very hypervisor-specific. This does not
guarantee the placement of the node's memory allocation. For proper
restriction other means should be used (e.g. different mode, preallocated
hugepages).
:since:`QEMU Since 1.2.7`