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SubjectRe: [PATCH v5 06/14] memory-hotplug: implement register_page_bootmem_info_section of sparse-vmemmap
On 2012/12/24 20:09, Tang Chen wrote:

> From: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
>
> 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.
>
> Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@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 | 33 ++++++++++++++++++++++---
> 8 files changed, 109 insertions(+), 14 deletions(-)
>
> diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
> index c641333..33943db 100644
> --- a/arch/ia64/mm/discontig.c
> +++ b/arch/ia64/mm/discontig.c
> @@ -822,4 +822,10 @@ int __meminit vmemmap_populate(struct page *start_page,
> {
> 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
> diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
> index 95a4529..6466440 100644
> --- a/arch/powerpc/mm/init_64.c
> +++ b/arch/powerpc/mm/init_64.c
> @@ -297,5 +297,11 @@ int __meminit vmemmap_populate(struct page *start_page,
>
> return 0;
> }
> +
> +void register_page_bootmem_memmap(unsigned long section_nr,
> + struct page *start_page, unsigned long size)
> +{
> + /* TODO */
> +}
> #endif /* CONFIG_SPARSEMEM_VMEMMAP */
>
> diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c
> index 6ed1426..2c14bc2 100644
> --- a/arch/s390/mm/vmem.c
> +++ b/arch/s390/mm/vmem.c
> @@ -272,6 +272,12 @@ 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.
> diff --git a/arch/sparc/mm/init_64.c b/arch/sparc/mm/init_64.c
> index 85be1ca..7e28c9e 100644
> --- a/arch/sparc/mm/init_64.c
> +++ b/arch/sparc/mm/init_64.c
> @@ -2231,6 +2231,12 @@ void __meminit vmemmap_populate_print_last(void)
> 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,
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index f78509c..aeaa27e 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -1000,6 +1000,58 @@ vmemmap_populate(struct page *start_page, unsigned long size, int node)
> 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);

Hi Tang,
In this case, pmd maps 512 pages, but you only get_page_bootmem() on the first page.
I think the whole 512 pages should be get_page_bootmem(), what do you think?

Thanks,
Jianguo Wu

> + }
> + }
> +}
> +
> void __meminit vmemmap_populate_print_last(void)
> {
> if (p_start) {
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 31a563b..2441f36 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -174,17 +174,10 @@ static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
> #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
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 6320407..1eca498 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1709,7 +1709,8 @@ int vmemmap_populate_basepages(struct page *start_page,
> 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,
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 2c5d734..34c656b 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -91,9 +91,8 @@ static void release_memory_resource(struct resource *res)
> }
>
> #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)
> {
> page->lru.next = (struct list_head *) type;
> SetPagePrivate(page);
> @@ -128,6 +127,7 @@ void __ref put_page_bootmem(struct page *page)
>
> }
>
> +#ifndef CONFIG_SPARSEMEM_VMEMMAP
> static void register_page_bootmem_info_section(unsigned long start_pfn)
> {
> unsigned long *usemap, mapsize, section_nr, i;
> @@ -161,6 +161,32 @@ static void register_page_bootmem_info_section(unsigned long start_pfn)
> 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);
> +
> + 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)
> {
> @@ -203,7 +229,6 @@ void register_page_bootmem_info_node(struct pglist_data *pgdat)
> 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)



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