Hi Andrew, The patch-set aims to linux-3.8. So we would like you to merge the patch-set into your tree. The patch-set applied many comments. Currently there is no comment to the patch-set. Additionally, we have spent a lot of time on the verification of the patch-set. And we found many bugs, and fixed them. So we believe that Linux on x86_64 can support memory hot remove by the patch-set. Thanks, Yasuaki Ishimatsu 2012/11/01 18:44, Wen Congyang wrote: > The patch-set was divided from following thread's patch-set. > https://lkml.org/lkml/2012/9/5/201 > > The last version of this patchset: > https://lkml.org/lkml/2012/10/23/213 > > If you want to know the reason, please read following thread. > > https://lkml.org/lkml/2012/10/2/83 > > The patch-set has only the function of kernel core side for physical > memory hot remove. So if you use the patch, please apply following > patches. > > - bug fix for memory hot remove > https://lkml.org/lkml/2012/10/31/269 > > - acpi framework > https://lkml.org/lkml/2012/10/26/175 > > The patches can free/remove the following things: > > - /sys/firmware/memmap/X/{end, start, type} : [PATCH 2/10] > - mem_section and related sysfs files : [PATCH 3-4/10] > - memmap of sparse-vmemmap : [PATCH 5-7/10] > - page table of removed memory : [RFC PATCH 8/10] > - node and related sysfs files : [RFC PATCH 9-10/10] > > * [PATCH 2/10] checks whether the memory can be removed or not. > > If you find lack of function for physical memory hot-remove, please let me > know. > > How to test this patchset? > 1. apply this patchset and build the kernel. MEMORY_HOTPLUG, MEMORY_HOTREMOVE, > ACPI_HOTPLUG_MEMORY must be selected. > 2. load the module acpi_memhotplug > 3. hotplug the memory device(it depends on your hardware) > You will see the memory device under the directory /sys/bus/acpi/devices/. > Its name is PNP0C80:XX. > 4. online/offline pages provided by this memory device > You can write online/offline to /sys/devices/system/memory/memoryX/state to > online/offline pages provided by this memory device > 5. hotremove the memory device > You can hotremove the memory device by the hardware, or writing 1 to > /sys/bus/acpi/devices/PNP0C80:XX/eject. > > Note: if the memory provided by the memory device is used by the kernel, it > can't be offlined. It is not a bug. > > Known problems: > 1. hotremoving memory device may cause kernel panicked > This bug will be fixed by Liu Jiang's patch: > https://lkml.org/lkml/2012/7/3/1 > > > Changelogs from v2 to v3: > Patch9: call sync_global_pgds() if pgd is changed > Patch10: fix a problem int the patch > > Changelogs from v1 to v2: > Patch1: new patch, offline memory twice. 1st iterate: offline every non primary > memory block. 2nd iterate: offline primary (i.e. first added) memory > block. > > Patch3: new patch, no logical change, just remove reduntant codes. > > Patch9: merge the patch from wujianguo into this patch. flush tlb on all cpu > after the pagetable is changed. > > Patch12: new patch, free node_data when a node is offlined > > Wen Congyang (6): > memory-hotplug: try to offline the memory twice to avoid dependence > memory-hotplug: remove redundant codes > memory-hotplug: introduce new function arch_remove_memory() for > removing page table depends on architecture > memory-hotplug: remove page table of x86_64 architecture > memory-hotplug: remove sysfs file of node > memory-hotplug: free node_data when a node is offlined > > Yasuaki Ishimatsu (6): > memory-hotplug: check whether all memory blocks are offlined or not > when removing memory > memory-hotplug: remove /sys/firmware/memmap/X sysfs > memory-hotplug: unregister memory section on SPARSEMEM_VMEMMAP > memory-hotplug: implement register_page_bootmem_info_section of > sparse-vmemmap > memory-hotplug: remove memmap of sparse-vmemmap > memory-hotplug: memory_hotplug: clear zone when removing the memory > > arch/ia64/mm/discontig.c | 14 ++ > arch/ia64/mm/init.c | 18 ++ > arch/powerpc/mm/init_64.c | 14 ++ > arch/powerpc/mm/mem.c | 12 + > arch/s390/mm/init.c | 12 + > arch/s390/mm/vmem.c | 14 ++ > arch/sh/mm/init.c | 17 ++ > arch/sparc/mm/init_64.c | 14 ++ > arch/tile/mm/init.c | 8 + > arch/x86/include/asm/pgtable_types.h | 1 + > arch/x86/mm/init_32.c | 12 + > arch/x86/mm/init_64.c | 417 +++++++++++++++++++++++++++++++++++ > arch/x86/mm/pageattr.c | 47 ++-- > drivers/acpi/acpi_memhotplug.c | 8 +- > drivers/base/memory.c | 6 + > drivers/firmware/memmap.c | 98 +++++++- > include/linux/firmware-map.h | 6 + > include/linux/memory_hotplug.h | 15 +- > include/linux/mm.h | 5 +- > mm/memory_hotplug.c | 409 ++++++++++++++++++++++++++++++++-- > mm/sparse.c | 5 +- > 21 files changed, 1095 insertions(+), 57 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
