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

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Date:	Tue, 4 Nov 2014 09:10:46 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<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>, <qiuxishi@...wei.com>, <mgorman@...e.de>,
	<rientjes@...gle.com>, <hannes@...xchg.org>
CC:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<tangchen@...fujitsu.com>
Subject: Re: [PATCH 0/2] Fix node meminfo corruption.

Hi all,

I thinks these two problems are very important and should be merged ASAP.
Would you please help to have a look at it ?

Thanks.

On 10/31/2014 05:46 PM, Tang Chen wrote:
> There are two problems when calculating node meminfo:
>
> 1. When hot-adding a node without onlining any page, MemTotal 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, MemFree of node3 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 */
> Node 3 MemUsed:               0 kB
> ......
>
> This patch-set fixes them.
>
> Tang Chen (2):
>    mem-hotplug: Reset node managed pages when hot-adding a new pgdat.
>    mem-hotplug: Fix wrong check for zone->pageset initialization in
>      online_pages().
>
>   include/linux/bootmem.h |  1 +
>   include/linux/mm.h      |  1 +
>   mm/bootmem.c            |  9 +++++----
>   mm/memory_hotplug.c     | 15 ++++++++++++++-
>   mm/nobootmem.c          |  8 +++++---
>   mm/page_alloc.c         |  5 +++++
>   6 files changed, 31 insertions(+), 8 deletions(-)
>

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