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

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Date:	Tue, 11 Nov 2014 09:27:05 +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>, <miaox@...fujitsu.com>,
	<stable@...r.kernel.org>
Subject: [PATCH v2 0/2] Fix node meminfo and zoneinfo corruption.

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(-)

-- 
1.8.3.1

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