[IA64] Sparse virtual implementation Equip IA64 sparsemem with a virtual memmap. This is similar to the existing CONFIG_VMEMMAP functionality for discontig. It uses a page size mapping. This is provided as a minimally intrusive solution. We split the 128TB VMALLOC area into two 64TB areas and use one for the virtual memmap. Signed-off-by: Christoph Lameter <clameter@xxxxxxx> Index: linux-2.6.21-rc5-mm2/arch/ia64/Kconfig =================================================================== --- linux-2.6.21-rc5-mm2.orig/arch/ia64/Kconfig 2007-04-02 16:15:29.000000000 -0700 +++ linux-2.6.21-rc5-mm2/arch/ia64/Kconfig 2007-04-02 16:15:50.000000000 -0700 @@ -350,6 +350,10 @@ config ARCH_SPARSEMEM_ENABLE def_bool y depends on ARCH_DISCONTIGMEM_ENABLE +config SPARSE_VIRTUAL + def_bool y + depends on ARCH_SPARSEMEM_ENABLE + config ARCH_DISCONTIGMEM_DEFAULT def_bool y if (IA64_SGI_SN2 || IA64_GENERIC || IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB) depends on ARCH_DISCONTIGMEM_ENABLE Index: linux-2.6.21-rc5-mm2/include/asm-ia64/page.h =================================================================== --- linux-2.6.21-rc5-mm2.orig/include/asm-ia64/page.h 2007-04-02 16:15:29.000000000 -0700 +++ linux-2.6.21-rc5-mm2/include/asm-ia64/page.h 2007-04-02 16:15:50.000000000 -0700 @@ -106,6 +106,9 @@ extern int ia64_pfn_valid (unsigned long # define ia64_pfn_valid(pfn) 1 #endif +#define vmemmap ((struct page *)(RGN_BASE(RGN_GATE) + \ + (1UL << (4*PAGE_SHIFT - 10)))) + #ifdef CONFIG_VIRTUAL_MEM_MAP extern struct page *vmem_map; #ifdef CONFIG_DISCONTIGMEM Index: linux-2.6.21-rc5-mm2/include/asm-ia64/pgtable.h =================================================================== --- linux-2.6.21-rc5-mm2.orig/include/asm-ia64/pgtable.h 2007-04-02 16:15:29.000000000 -0700 +++ linux-2.6.21-rc5-mm2/include/asm-ia64/pgtable.h 2007-04-02 16:15:50.000000000 -0700 @@ -236,8 +236,13 @@ ia64_phys_addr_valid (unsigned long addr # define VMALLOC_END vmalloc_end extern unsigned long vmalloc_end; #else +#if defined(CONFIG_SPARSEMEM) && defined(CONFIG_SPARSE_VIRTUAL) +/* SPARSE_VIRTUAL uses half of vmalloc... */ +# define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 10))) +#else # define VMALLOC_END (RGN_BASE(RGN_GATE) + (1UL << (4*PAGE_SHIFT - 9))) #endif +#endif /* fs/proc/kcore.c */ #define kc_vaddr_to_offset(v) ((v) - RGN_BASE(RGN_GATE)) - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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