linux-kernel - Re: [PATCH v2 0/2] Fix node meminfo and zoneinfo corruption.

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Date:	Mon, 10 Nov 2014 17:36:06 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	<akpm@...ux-foundation.org>, <santosh.shilimkar@...com>,
	<grygorii.strashko@...com>, <yinghai@...nel.org>,
	<isimatu.yasuaki@...fujitsu.co>, <fabf@...net.be>,
	<nzimmer@....com>, <wangnan0@...wei.com>, <vdavydov@...allels.com>,
	<toshi.kani@...com>, <phacht@...ux.vnet.ibm.com>, <tj@...nel.org>,
	<kirill.shutemov@...ux.intel.com>, <riel@...hat.com>,
	<luto@...capital.net>, <hpa@...ux.intel.com>,
	<aarcange@...hat.com>, <mgorman@...e.de>, <rientjes@...gle.com>,
	<hannes@...xchg.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <miaox@...fujitsu.com>
Subject: Re: [PATCH v2 0/2] Fix node meminfo and zoneinfo corruption.

On 2014/11/7 17:44, Tang Chen wrote:

> There are two problems in memory hot-add progress:
> 
> 1. When hot-adding a node without onlining any page, node meminfo corrupted:
> 
> # hot-add node2 (memory not onlined)
> # cat /sys/device/system/node/node2/meminfo
> Node 2 MemTotal:       33554432 kB			/* corrupted */
> Node 2 MemFree:               0 kB
> Node 2 MemUsed:        33554432 kB
> Node 2 Active:                0 kB
> ......
> 
> 
> 2. When onlining memory on node2, node2 zoneinfo and node3 meminfo corrupted:
> 
> # for ((i = 2048; i < 2064; i++)); do echo online_movable > /sys/devices/system/node/node2/memory$i/state; done
> # cat /sys/devices/system/node/node2/meminfo
> Node 2 MemTotal:       33554432 kB
> Node 2 MemFree:        33549092 kB
> Node 2 MemUsed:            5340 kB
> ......
> # cat /sys/devices/system/node/node3/meminfo
> Node 3 MemTotal:              0 kB
> Node 3 MemFree:               248 kB      /* corrupted, should be 0 */
> Node 3 MemUsed:               0 kB
> ......
> 
> # cat /proc/zoneinfo
> ......
> Node 2, zone   Movable
> ......
>         spanned  8388608
>         present  16777216		/* corrupted, should be 8388608 */
>         managed  8388608
> 
> 
> 
> Change log v1 -> v2:
> 1. Replace patch 2/2 with a new one. It provides the simplest way to
>    fix problem 2. 
> 
> Tang Chen (2):
>   mem-hotplug: Reset node managed pages when hot-adding a new pgdat.
>   mem-hotplug: Reset node present pages when hot-adding a new pgdat.
> 
>  include/linux/bootmem.h |  1 +
>  mm/bootmem.c            |  9 +++++----
>  mm/memory_hotplug.c     | 24 ++++++++++++++++++++++++
>  mm/nobootmem.c          |  8 +++++---
>  4 files changed, 35 insertions(+), 7 deletions(-)
> 

Hi Tang,

How about cc stable ?
 

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