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 v2 -> v3:
1. Also clear pgdat->node_present_pages in patch 2/2.
2. Add Cc: stable@xxxxxxxxxxxxxxx # 3.16+ since it is urgent.
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 | 26 ++++++++++++++++++++++++++
mm/nobootmem.c | 8 +++++---
4 files changed, 37 insertions(+), 7 deletions(-)
--
1.8.3.1
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