Re: [PATCH] mm: Introduce kernelcore=reliable option

From: Luck, Tony
Date: Thu Oct 22 2015 - 21:44:37 EST


First part of each memory controller. I have two memory controllers on each node

Sent from my iPhone

> On Oct 22, 2015, at 18:01, Izumi, Taku <izumi.taku@xxxxxxxxxxxxxx> wrote:
>
> Dear Tony,
>
>> -----Original Message-----
>> From: Luck, Tony [mailto:tony.luck@xxxxxxxxx]
>> Sent: Friday, October 23, 2015 8:27 AM
>> To: Kamezawa, Hiroyuki/亀澤 寛之; Izumi, Taku/泉 拓; linux-kernel@xxxxxxxxxxxxxxx; linux-mm@xxxxxxxxx
>> Cc: qiuxishi@xxxxxxxxxx; mel@xxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx; Hansen, Dave; matt@xxxxxxxxxxxxxxxxxxx
>> Subject: RE: [PATCH] mm: Introduce kernelcore=reliable option
>>
>>> I think /proc/zoneinfo can show detailed numbers per zone. Do we need some for meminfo ?
>>
>> I wrote a little script (attached) to summarize /proc/zoneinfo ... on my system it says
>>
>> $ zoneinfo
>> Node Normal Movable DMA DMA32
>> 0 0.00 103020.07 8.94 1554.46
>> 1 9284.54 89870.43
>> 2 9626.33 94050.09
>> 3 9602.82 93650.04
>>
>> Not sure why I have zero Normal memory free on node0. The sum of all those
>> free counts is 410667.72 MB ... which is close enough to the boot time message
>> showing the amount of mirror/total memory:
>>
>> [ 0.000000] efi: Memory: 80979/420096M mirrored memory
>>
>> but a fair amount of the 80G of mirrored memory seems to have been miscounted
>> as Movable instead of Normal. Perhaps this is because I have two blocks of mirrored
>> memory on each node and the movable zone code doesn't expect that?
>
> You were saying that OS view of memory of node is something like the following ?
>
> Node X: |MMMMMM------MMMMMM--------|
> (legend) M: mirrored -: not mirrrored
>
> If so, is this a real Box's configuration?
> Sorry, I haven't got a real Address Range Mirror capable boxes yet ...
> I thought mirroring range is concatenated at the first part of each node.
>
> Sincerely,
> Taku Izumi
>
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