Commit 4bb4a273 authored by Igor Mammedov's avatar Igor Mammedov Committed by Eduardo Habkost
Browse files

numa: deprecate implict memory distribution between nodes 



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: default avatarIgor Mammedov <imammedo@redhat.com>
Message-Id: <1559205199-233510-4-git-send-email-imammedo@redhat.com>
Signed-off-by: default avatarEduardo Habkost <ehabkost@redhat.com>
parent cdf80365

hw/core/numa.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

qemu-deprecated.texi

+8 −0
Original line number Diff line number Diff line
@@ -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)