The following patch-set from Yinghai allocates pagetables to local nodes.
v1: https://lkml.org/lkml/2013/3/7/642
v2: https://lkml.org/lkml/2013/3/10/47
v3: https://lkml.org/lkml/2013/4/4/639
v4: https://lkml.org/lkml/2013/4/11/829
Since pagetable pages are used by the kernel, they cannot be offlined.
As a result, they cannot be hot-remove.
This patch fix this problem with the following solution:
1. Introduce a new bootmem type LOCA_NODE_DATAL, and register local
pagetable pages as LOCA_NODE_DATAL by setting page->lru.next to
LOCA_NODE_DATAL, just like we register SECTION_INFO pages.
2. Skip LOCA_NODE_DATAL pages in offline/online procedures. When the
whole memory block they reside in is offlined, the kernel can
still access the pagetables.
(This changes the semantics of offline/online a little bit.)
3. Do not free LOCA_NODE_DATAL pages to buddy system because they
were skipped when in offline/online procedures. The memory block
they reside in could have been offlined.
Anyway, this problem should be fixed. Any better idea is welcome.
Tang Chen (4):
bootmem, mem-hotplug: Register local pagetable pages with
LOCAL_NODE_DATA when freeing bootmem.
mem-hotplug: Skip LOCAL_NODE_DATA pages in memory offline procedure.
mem-hotplug: Skip LOCAL_NODE_DATA pages in memory online procedure.
mem-hotplug: Do not free LOCAL_NODE_DATA pages to buddy system in
hot-remove procedure.
arch/x86/mm/init_64.c | 2 +
include/linux/memblock.h | 22 +++++++++++++++++
include/linux/memory_hotplug.h | 13 ++++++++-
mm/memblock.c | 52 ++++++++++++++++++++++++++++++++++++++++
mm/memory_hotplug.c | 42 +++++++++++++++++++++++++++++++-
mm/page_alloc.c | 18 ++++++++++++-
mm/page_isolation.c | 6 ++++
7 files changed, 150 insertions(+), 5 deletions(-)
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