linux-kernel - Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

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Date:   Wed, 07 Jun 2017 22:08:40 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     Michael Bringmann <mwb@...ux.vnet.ibm.com>,
        Reza Arbab <arbab@...ux.vnet.ibm.com>
Cc:     Balbir Singh <bsingharora@...il.com>, linux-kernel@...r.kernel.org,
        Paul Mackerras <paulus@...ba.org>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Bharata B Rao <bharata@...ux.vnet.ibm.com>,
        Shailendra Singh <shailendras@...dia.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linuxppc-dev@...ts.ozlabs.org,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Michael Bringmann from Kernel Team <mbringm@...ibm.com>
Subject: Re: [Patch 2/2]: powerpc/hotplug/mm: Fix hot-add memory node assoc

Michael Bringmann <mwb@...ux.vnet.ibm.com> writes:

> On 06/06/2017 04:48 AM, Michael Ellerman wrote:
>> Michael Bringmann <mwb@...ux.vnet.ibm.com> writes:
>>> On 06/01/2017 04:36 AM, Michael Ellerman wrote:
>>>> Do you actually see mention of nodes 0 and 8 in the dmesg?
>>>
>>> When the 'numa.c' code is built with debug messages, and the system was
>>> given that configuration by pHyp, yes, I did.
>>>
>>>> What does it say?
>>>
>>> The debug message for each core thread would be something like,
>>>
>>>     removing cpu 64 from node 0
>>>     adding cpu 64 to node 8
>>>
>>> repeated for all 8 threads of the CPU, and usually with the messages
>>> for all of the CPUs coming out intermixed on the console/dmesg log.
>> 
>> OK. I meant what do you see at boot.
>
> Here is an example with nodes 0,2,6,7, node 0 starts out empty:
>
> [    0.000000] Initmem setup node 0
> [    0.000000]   NODE_DATA [mem 0x3bff7d6300-0x3bff7dffff]
> [    0.000000]     NODE_DATA(0) on node 7
> [    0.000000] Initmem setup node 2 [mem 0x00000000-0x13ffffffff]
> [    0.000000]   NODE_DATA [mem 0x13ffff6300-0x13ffffffff]
> [    0.000000] Initmem setup node 6 [mem 0x1400000000-0x34afffffff]
> [    0.000000]   NODE_DATA [mem 0x34afff6300-0x34afffffff]
> [    0.000000] Initmem setup node 7 [mem 0x34b0000000-0x3bffffffff]
> [    0.000000]   NODE_DATA [mem 0x3bff7cc600-0x3bff7d62ff]
>
> [    0.000000] Zone ranges:
> [    0.000000]   DMA      [mem 0x0000000000000000-0x0000003bffffffff]
> [    0.000000]   DMA32    empty
> [    0.000000]   Normal   empty
> [    0.000000] Movable zone start for each node
> [    0.000000] Early memory node ranges
> [    0.000000]   node   2: [mem 0x0000000000000000-0x00000013ffffffff]
> [    0.000000]   node   6: [mem 0x0000001400000000-0x00000034afffffff]
> [    0.000000]   node   7: [mem 0x00000034b0000000-0x0000003bffffffff]
> [    0.000000] Could not find start_pfn for node 0
> [    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000000000000]
> [    0.000000] Initmem setup node 2 [mem 0x0000000000000000-0x00000013ffffffff]
> [    0.000000] Initmem setup node 6 [mem 0x0000001400000000-0x00000034afffffff]
> [    0.000000] Initmem setup node 7 [mem 0x00000034b0000000-0x0000003bffffffff]
> [    0.000000] percpu: Embedded 3 pages/cpu @c000003bf8000000 s155672 r0 d40936 u262144
> [    0.000000] Built 4 zonelists in Node order, mobility grouping on.  Total pages: 3928320
>
> and,
>
> [root@...alpine2-lp20 ~]# numactl --hardware
> available: 4 nodes (0,2,6-7)
> node 0 cpus:
> node 0 size: 0 MB
> node 0 free: 0 MB
> node 2 cpus: 16 17 18 19 20 21 22 23 32 33 34 35 36 37 38 39 56 57 58 59 60 61 62 63
> node 2 size: 81792 MB
> node 2 free: 81033 MB
> node 6 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 24 25 26 27 28 29 30 31 40 41 42 43 44 45 46 47
> node 6 size: 133743 MB
> node 6 free: 133097 MB
> node 7 cpus: 48 49 50 51 52 53 54 55
> node 7 size: 29877 MB
> node 7 free: 29599 MB
> node distances:
> node   0   2   6   7
>   0:  10  40  40  40
>   2:  40  10  40  40
>   6:  40  40  10  20
>   7:  40  40  20  10
> [root@...alpine2-lp20 ~]#

What kernel is that running?

And can you show me the full ibm,dynamic-memory and lookup-arrays
properties for that system?

cheers