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 LOCAL_NODE_DATAL, and register local pagetable pages as LOCAL_NODE_DATAL by setting page->lru.next to LOCAL_NODE_DATAL, just like we register SECTION_INFO pages. 2. Skip LOCAL_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 LOCAL_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. Change log: v1 -> v2: patch2: As suggested by Wu Jianguo, define a macro to check if a page cantains local node data. patch4: As suggested by Wu Jianguo, prevent freeing LOCAL_NODE_DATA pages in free_pagetable() instead of in put_page_bootmem(). 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 | 10 +++++++- include/linux/memblock.h | 22 +++++++++++++++++ include/linux/memory_hotplug.h | 20 +++++++++++++-- mm/memblock.c | 52 ++++++++++++++++++++++++++++++++++++++++ mm/memory_hotplug.c | 31 +++++++++++++++++++++++ mm/page_alloc.c | 15 ++++++++++- mm/page_isolation.c | 5 ++++ 7 files changed, 149 insertions(+), 6 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
