[PATCH 0/2] Fix node meminfo corruption.

[Tang Chen]

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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