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numa: deprecate implict memory distribution between nodes

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Implicit RAM distribution between nodes has exactly the same issues as:
  "numa: deprecate 'mem' parameter of '-numa node' option"
only with QEMU being the user that's 'adding' 'mem' parameter.

Deprecate it, to get it out of the way so that we could consolidate
guest RAM allocation using memory backends making it consistent and
possibly later on transition to using memory devices instead of
adhoc memory mapping for the initial RAM.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1559205199-233510-4-git-send-email-imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Igor Mammedov 2019-05-30 10:33:19 +02:00 committed by Eduardo Habkost
parent cdf8036520
commit 4bb4a2732e
2 changed files with 11 additions and 0 deletions
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3
hw/core/numa.c
View File

@ -405,6 +405,9 @@ void numa_complete_configuration(MachineState *ms)
if (i == nb_numa_nodes) {
assert(mc->numa_auto_assign_ram);
mc->numa_auto_assign_ram(mc, numa_info, nb_numa_nodes, ram_size);
warn_report("Default splitting of RAM between nodes is deprecated,"
" Use '-numa node,memdev' to explictly define RAM"
" allocation per node");
}
numa_total = 0;

8
qemu-deprecated.texi
View File

@ -104,6 +104,14 @@ In future new machine versions will not accept the option but it will still
work with old machine types. User can check QAPI schema to see if the legacy
option is supported by looking at MachineInfo::numa-mem-supported property.
@subsection -numa node (without memory specified) (since 4.1)
Splitting RAM by default between NUMA nodes has the same issues as @option{mem}
parameter described above with the difference that the role of the user plays
QEMU using implicit generic or board specific splitting rule.
Use @option{memdev} with @var{memory-backend-ram} backend or @option{mem} (if
it's supported by used machine type) to define mapping explictly instead.
@section QEMU Machine Protocol (QMP) commands
@subsection block-dirty-bitmap-add "autoload" parameter (since 2.12.0)