For removing memmap region of sparse-vmemmap which is allocated bootmem, memmap region of sparse-vmemmap needs to be registered by get_page_bootmem(). So the patch searches pages of virtual mapping and registers the pages by get_page_bootmem().
Note: register_page_bootmem_memmap() is not implemented for ia64, ppc, s390, and sparc. CC: David Rientjes <rient...@google.com> CC: Jiang Liu <liu...@gmail.com> CC: Len Brown <len.br...@intel.com> CC: Christoph Lameter <c...@linux.com> Cc: Minchan Kim <minchan....@gmail.com> CC: Andrew Morton <a...@linux-foundation.org> CC: KOSAKI Motohiro <kosaki.motoh...@jp.fujitsu.com> Signed-off-by: Wen Congyang <we...@cn.fujitsu.com> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasu...@jp.fujitsu.com> --- arch/ia64/mm/discontig.c | 6 ++++ arch/powerpc/mm/init_64.c | 6 ++++ arch/s390/mm/vmem.c | 6 ++++ arch/sparc/mm/init_64.c | 6 ++++ arch/x86/mm/init_64.c | 52 +++++++++++++++++++++++++++++++++++++++++ include/linux/memory_hotplug.h | 11 +------- include/linux/mm.h | 3 +- mm/memory_hotplug.c | 37 ++++++++++++++++++++++++++--- 8 files changed, 113 insertions(+), 14 deletions(-) Index: linux-3.6/include/linux/memory_hotplug.h =================================================================== --- linux-3.6.orig/include/linux/memory_hotplug.h 2012-10-04 17:15:03.029828127 +0900 +++ linux-3.6/include/linux/memory_hotplug.h 2012-10-04 17:15:59.010833688 +0900 @@ -163,17 +163,10 @@ static inline void arch_refresh_nodedata #endif /* CONFIG_NUMA */ #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ -#ifdef CONFIG_SPARSEMEM_VMEMMAP -static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) -{ -} -static inline void put_page_bootmem(struct page *page) -{ -} -#else extern void register_page_bootmem_info_node(struct pglist_data *pgdat); extern void put_page_bootmem(struct page *page); -#endif +extern void get_page_bootmem(unsigned long ingo, struct page *page, + unsigned long type); /* * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug Index: linux-3.6/mm/memory_hotplug.c =================================================================== --- linux-3.6.orig/mm/memory_hotplug.c 2012-10-04 17:15:27.213831361 +0900 +++ linux-3.6/mm/memory_hotplug.c 2012-10-04 17:37:00.176401540 +0900 @@ -91,9 +91,8 @@ static void release_memory_resource(stru } #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE -#ifndef CONFIG_SPARSEMEM_VMEMMAP -static void get_page_bootmem(unsigned long info, struct page *page, - unsigned long type) +void get_page_bootmem(unsigned long info, struct page *page, + unsigned long type) { unsigned long page_type; @@ -127,6 +126,7 @@ void __ref put_page_bootmem(struct page } +#ifndef CONFIG_SPARSEMEM_VMEMMAP static void register_page_bootmem_info_section(unsigned long start_pfn) { unsigned long *usemap, mapsize, section_nr, i; @@ -160,6 +160,36 @@ static void register_page_bootmem_info_s get_page_bootmem(section_nr, page, MIX_SECTION_INFO); } +#else +static void register_page_bootmem_info_section(unsigned long start_pfn) +{ + unsigned long *usemap, mapsize, section_nr, i; + struct mem_section *ms; + struct page *page, *memmap; + + if (!pfn_valid(start_pfn)) + return; + + section_nr = pfn_to_section_nr(start_pfn); + ms = __nr_to_section(section_nr); + + memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); + + page = virt_to_page(memmap); + mapsize = sizeof(struct page) * PAGES_PER_SECTION; + mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; + + register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); + + usemap = __nr_to_section(section_nr)->pageblock_flags; + page = virt_to_page(usemap); + + mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; + + for (i = 0; i < mapsize; i++, page++) + get_page_bootmem(section_nr, page, MIX_SECTION_INFO); +} +#endif void register_page_bootmem_info_node(struct pglist_data *pgdat) { @@ -202,7 +232,6 @@ void register_page_bootmem_info_node(str register_page_bootmem_info_section(pfn); } } -#endif /* !CONFIG_SPARSEMEM_VMEMMAP */ static void grow_zone_span(struct zone *zone, unsigned long start_pfn, unsigned long end_pfn) Index: linux-3.6/arch/ia64/mm/discontig.c =================================================================== --- linux-3.6.orig/arch/ia64/mm/discontig.c 2012-10-01 08:47:46.000000000 +0900 +++ linux-3.6/arch/ia64/mm/discontig.c 2012-10-04 17:15:59.209833459 +0900 @@ -822,4 +822,10 @@ int __meminit vmemmap_populate(struct pa { return vmemmap_populate_basepages(start_page, size, node); } + +void register_page_bootmem_memmap(unsigned long section_nr, + struct page *start_page, unsigned long size) +{ + /* TODO */ +} #endif Index: linux-3.6/arch/powerpc/mm/init_64.c =================================================================== --- linux-3.6.orig/arch/powerpc/mm/init_64.c 2012-10-01 08:47:46.000000000 +0900 +++ linux-3.6/arch/powerpc/mm/init_64.c 2012-10-04 17:15:59.217833663 +0900 @@ -298,5 +298,11 @@ int __meminit vmemmap_populate(struct pa return 0; } + +void register_page_bootmem_memmap(unsigned long section_nr, + struct page *start_page, unsigned long size) +{ + /* TODO */ +} #endif /* CONFIG_SPARSEMEM_VMEMMAP */ Index: linux-3.6/arch/s390/mm/vmem.c =================================================================== --- linux-3.6.orig/arch/s390/mm/vmem.c 2012-10-01 08:47:46.000000000 +0900 +++ linux-3.6/arch/s390/mm/vmem.c 2012-10-04 17:15:59.227833764 +0900 @@ -227,6 +227,12 @@ out: return ret; } +void register_page_bootmem_memmap(unsigned long section_nr, + struct page *start_page, unsigned long size) +{ + /* TODO */ +} + /* * Add memory segment to the segment list if it doesn't overlap with * an already present segment. Index: linux-3.6/arch/sparc/mm/init_64.c =================================================================== --- linux-3.6.orig/arch/sparc/mm/init_64.c 2012-10-01 08:47:46.000000000 +0900 +++ linux-3.6/arch/sparc/mm/init_64.c 2012-10-04 17:15:59.232833747 +0900 @@ -2077,6 +2077,12 @@ void __meminit vmemmap_populate_print_la node_start = 0; } } + +void register_page_bootmem_memmap(unsigned long section_nr, + struct page *start_page, unsigned long size) +{ + /* TODO */ +} #endif /* CONFIG_SPARSEMEM_VMEMMAP */ static void prot_init_common(unsigned long page_none, Index: linux-3.6/arch/x86/mm/init_64.c =================================================================== --- linux-3.6.orig/arch/x86/mm/init_64.c 2012-10-04 17:15:03.021828121 +0900 +++ linux-3.6/arch/x86/mm/init_64.c 2012-10-04 17:15:59.240833769 +0900 @@ -993,6 +993,58 @@ vmemmap_populate(struct page *start_page return 0; } +void register_page_bootmem_memmap(unsigned long section_nr, + struct page *start_page, unsigned long size) +{ + unsigned long addr = (unsigned long)start_page; + unsigned long end = (unsigned long)(start_page + size); + unsigned long next; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + + for (; addr < end; addr = next) { + pte_t *pte = NULL; + + pgd = pgd_offset_k(addr); + if (pgd_none(*pgd)) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + continue; + } + get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO); + + pud = pud_offset(pgd, addr); + if (pud_none(*pud)) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + continue; + } + get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO); + + if (!cpu_has_pse) { + next = (addr + PAGE_SIZE) & PAGE_MASK; + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + continue; + get_page_bootmem(section_nr, pmd_page(*pmd), + MIX_SECTION_INFO); + + pte = pte_offset_kernel(pmd, addr); + if (pte_none(*pte)) + continue; + get_page_bootmem(section_nr, pte_page(*pte), + SECTION_INFO); + } else { + next = pmd_addr_end(addr, end); + + pmd = pmd_offset(pud, addr); + if (pmd_none(*pmd)) + continue; + get_page_bootmem(section_nr, pmd_page(*pmd), + SECTION_INFO); + } + } +} + void __meminit vmemmap_populate_print_last(void) { if (p_start) { Index: linux-3.6/include/linux/mm.h =================================================================== --- linux-3.6.orig/include/linux/mm.h 2012-10-01 08:47:46.000000000 +0900 +++ linux-3.6/include/linux/mm.h 2012-10-04 17:15:59.246833767 +0900 @@ -1618,7 +1618,8 @@ int vmemmap_populate_basepages(struct pa unsigned long pages, int node); int vmemmap_populate(struct page *start_page, unsigned long pages, int node); void vmemmap_populate_print_last(void); - +void register_page_bootmem_memmap(unsigned long section_nr, struct page *map, + unsigned long size); enum mf_flags { MF_COUNT_INCREASED = 1 << 0, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/