linux-kernel - RE: [PATCH] mm: Introduce kernelcore=reliable option

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Message-ID: <E86EADE93E2D054CBCD4E708C38D364A54280C26@G01JPEXMBYT01>
Date:	Fri, 23 Oct 2015 01:01:12 +0000
From:	"Izumi, Taku" <izumi.taku@...fujitsu.com>
To:	"Luck, Tony" <tony.luck@...el.com>,
	"Kamezawa, Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
CC:	"qiuxishi@...wei.com" <qiuxishi@...wei.com>,
	"mel@....ul.ie" <mel@....ul.ie>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"Hansen, Dave" <dave.hansen@...el.com>,
	"matt@...eblueprint.co.uk" <matt@...eblueprint.co.uk>
Subject: RE: [PATCH] mm: Introduce kernelcore=reliable option

 Dear Tony,

> -----Original Message-----
> From: Luck, Tony [mailto:tony.luck@...el.com]
> Sent: Friday, October 23, 2015 8:27 AM
> To: Kamezawa, Hiroyuki/亀澤 寛之; Izumi, Taku/泉 拓; linux-kernel@...r.kernel.org; linux-mm@...ck.org
> Cc: qiuxishi@...wei.com; mel@....ul.ie; akpm@...ux-foundation.org; Hansen, Dave; matt@...eblueprint.co.uk
> 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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