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

[Xishi Qiu]

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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