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10218ae6d0
Let's make it easier to pin threads created via a ThreadContext to
all host CPUs currently belonging to a given set of host NUMA nodes --
which is the common case.
"node-affinity" is simply a shortcut for setting "cpu-affinity" manually
to the list of host CPUs belonging to the set of host nodes. This property
can only be written.
A simple QEMU example to set the CPU affinity to host node 1 on a system
with two nodes, 24 CPUs each, whereby odd-numbered host CPUs belong to
host node 1:
qemu-system-x86_64 -S \
-object thread-context,id=tc1,node-affinity=1
And we can query the cpu-affinity via HMP/QMP:
(qemu) qom-get tc1 cpu-affinity
[
1,
3,
5,
7,
9,
11,
13,
15,
17,
19,
21,
23,
25,
27,
29,
31,
33,
35,
37,
39,
41,
43,
45,
47
]
We cannot query the node-affinity:
(qemu) qom-get tc1 node-affinity
Error: Insufficient permission to perform this operation
But note that due to dynamic library loading this example will not work
before we actually make use of thread_context_create_thread() in QEMU
code, because the type will otherwise not get registered. We'll wire
this up next to make it work.
Note that if the host CPUs for a host node change due do CPU hot(un)plug
CPU onlining/offlining (i.e., lscpu output changes) after the ThreadContext
was started, the CPU affinity will not get updated.
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20221014134720.168738-5-david@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
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| .. | ||
| acpi.json | ||
| audio.json | ||
| authz.json | ||
| block-core.json | ||
| block-export.json | ||
| block.json | ||
| char.json | ||
| common.json | ||
| compat.json | ||
| control.json | ||
| crypto.json | ||
| dump.json | ||
| error.json | ||
| introspect.json | ||
| job.json | ||
| machine-target.json | ||
| machine.json | ||
| meson.build | ||
| migration.json | ||
| misc-target.json | ||
| misc.json | ||
| net.json | ||
| opts-visitor.c | ||
| pci.json | ||
| pragma.json | ||
| qapi-clone-visitor.c | ||
| qapi-dealloc-visitor.c | ||
| qapi-forward-visitor.c | ||
| qapi-schema.json | ||
| qapi-type-helpers.c | ||
| qapi-util.c | ||
| qapi-visit-core.c | ||
| qdev.json | ||
| qmp-dispatch.c | ||
| qmp-event.c | ||
| qmp-registry.c | ||
| qobject-input-visitor.c | ||
| qobject-output-visitor.c | ||
| qom.json | ||
| rdma.json | ||
| replay.json | ||
| rocker.json | ||
| run-state.json | ||
| sockets.json | ||
| stats.json | ||
| string-input-visitor.c | ||
| string-output-visitor.c | ||
| tpm.json | ||
| trace-events | ||
| trace.h | ||
| trace.json | ||
| transaction.json | ||
| ui.json | ||
| virtio.json | ||
| yank.json | ||