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

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Message-ID: <1415781410-19825-1-git-send-email-tangchen@cn.fujitsu.com>
Date:	Wed, 12 Nov 2014 16:36:48 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	<akpm@...ux-foundation.org>, <grygorii.strashko@...com>,
	<yinghai@...nel.org>, <isimatu.yasuaki@...fujitsu.com>,
	<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: [PATCH 0/2] Fix node meminfo corruption.

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(-)

-- 
1.8.3.1

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