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

[Izumi, Taku]

 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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