Am 15.02.2014 13:59, schrieb Alexandre DERUMIER:
cpu hot add is already implemented. (even in proxmox ;)
https://git.proxmox.com/?p=qemu-server.git;a=commit;h=838776ab650f0593b48c234070c1a189fdbd72c7
cpu hot del is not yet implemented. (but they are some prelimary patches in the
qemu mailing list)
memory hotplug is not yet implemented. (should be ok for next qemu 2.0 release
I think)
But maybe they are cheating, like I do : just use ballonning with a fixed size ?
No they don't ;-) here an output of a running vm adding more memory:
[ 356.984360] Hotplug Mem Device
[ 356.985973] init_memory_mapping: 0000000040000000-0000000080000000
[ 356.986070] 0040000000 - 0080000000 page 1G
[ 356.988604] [ffffea0001000000-ffffea00011fffff] PMD ->
[ffff88003ce00000-ffff88003cffffff] on node 0
[ 356.997027] [ffffea0001200000-ffffea00013fffff] PMD ->
[ffff88003c800000-ffff88003c9fffff] on node 0
[ 356.998495] [ffffea0001400000-ffffea00015fffff] PMD ->
[ffff88003c600000-ffff88003c7fffff] on node 0
[ 357.000084] [ffffea0001600000-ffffea00017fffff] PMD ->
[ffff88003b000000-ffff88003b1fffff] on node 0
[ 357.001459] [ffffea0001800000-ffffea00019fffff] PMD ->
[ffff880034c00000-ffff880034dfffff] on node 0
[ 357.004401] [ffffea0001a00000-ffffea0001dfffff] PMD ->
[ffff88003c000000-ffff88003c3fffff] on node 0
[ 357.007038] Hotplug Mem Device
[ 357.024941] Built 1 zonelists in Node order, mobility grouping on.
Total pages: 273785
[ 357.024941] Policy zone: Normal
[ 357.038623] init_memory_mapping: 0000000080000000-00000000c0000000
[ 357.038636] 0080000000 - 00c0000000 page 1G
[ 357.038782] [ffffea0001e00000-ffffea0001ffffff] PMD ->
[ffff88003b400000-ffff88003b5fffff] on node 0
[ 357.040088] [ffffea0002000000-ffffea00021fffff] PMD ->
[ffff880047e00000-ffff880047ffffff] on node 0
[ 357.040756] [ffffea0002200000-ffffea00025fffff] PMD ->
[ffff88007fc00000-ffff88007fffffff] on node 0
[ 357.044036] [ffffea0002600000-ffffea00029fffff] PMD ->
[ffff88007f800000-ffff88007fbfffff] on node 0
[ 357.062995] [ffffea0002a00000-ffffea0002dfffff] PMD ->
[ffff88007f400000-ffff88007f7fffff] on node 0
[ 357.072594] Hotplug Mem Device
[ 357.119388] init_memory_mapping: 0000000100000000-0000000140000000
[ 357.119388] 0100000000 - 0140000000 page 1G
[ 357.121941] [ffffea0002e00000-ffffea00041fffff] PMD ->
[ffff88007f000000-ffff88007f3fffff] on node 0
[ 357.125199] [ffffea0004200000-ffffea00045fffff] PMD ->
[ffff880087800000-ffff880087bfffff] on node 0
[ 357.128890] [ffffea0004600000-ffffea00049fffff] PMD ->
[ffff880087400000-ffff8800877fffff] on node 0
[ 357.132014] [ffffea0004a00000-ffffea0004dfffff] PMD ->
[ffff880087000000-ffff8800873fffff] on node 0
[ 357.135378] Hotplug Mem Device
[ 357.170010] init_memory_mapping: 0000000140000000-0000000180000000
[ 357.170010] 0140000000 - 0180000000 page 1G
[ 357.170174] [ffffea0004e00000-ffffea00051fffff] PMD ->
[ffff880086c00000-ffff880086ffffff] on node 0
[ 357.172473] [ffffea0005200000-ffffea00055fffff] PMD ->
[ffff880127c00000-ffff880127ffffff] on node 0
[ 357.175795] [ffffea0005600000-ffffea00059fffff] PMD ->
[ffff880127800000-ffff880127bfffff] on node 0
[ 357.180010] [ffffea0005a00000-ffffea0005dfffff] PMD ->
[ffff880127400000-ffff8801277fffff] on node 0
[ 357.195142] Hotplug Mem Device
[ 357.195409] init_memory_mapping: 0000000180000000-00000001c0000000
[ 357.195409] 0180000000 - 01c0000000 page 1G
[ 357.197770] [ffffea0005e00000-ffffea00061fffff] PMD ->
[ffff880127000000-ffff8801273fffff] on node 0
[ 357.199525] [ffffea0006200000-ffffea00063fffff] PMD ->
[ffff880137e00000-ffff880137ffffff] on node 0
[ 357.202982] [ffffea0006400000-ffffea00067fffff] PMD ->
[ffff880137800000-ffff880137bfffff] on node 0
[ 357.206225] [ffffea0006800000-ffffea0006bfffff] PMD ->
[ffff880137400000-ffff8801377fffff] on node 0
[ 357.210314] Hotplug Mem Device
[ 357.280089] init_memory_mapping: 00000001c0000000-0000000200000000
[ 357.280089] 01c0000000 - 0200000000 page 1G
[ 357.280295] [ffffea0006c00000-ffffea0006ffffff] PMD ->
[ffff880137000000-ffff8801373fffff] on node 0
[ 357.280898] [ffffea0007000000-ffffea00073fffff] PMD ->
[ffff8801b7c00000-ffff8801b7ffffff] on node 0
[ 357.284138] [ffffea0007400000-ffffea00077fffff] PMD ->
[ffff8801b7800000-ffff8801b7bfffff] on node 0
[ 357.290084] [ffffea0007800000-ffffea0007bfffff] PMD ->
[ffff8801b7400000-ffff8801b77fffff] on node 0
Stefan
----- Mail original -----
De: "Stefan Priebe" <[email protected]>
À: [email protected]
Envoyé: Vendredi 14 Février 2014 21:18:47
Objet: [pve-devel] CPU and Memory hot add
Hi,
while browsing the web, i found profitbricks, which is active in germany
and the us (http://www.profitbricks.com/technical-info).
They use KVM and offer memory and cpu hot add on the fly? Anybody an
idea how this works if kvm does not already support it?
Greets,
Stefan
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