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