Messages in this thread Patch in this message | | | From | Marc-Christian Petersen <> | Subject | Re: Highmem emulation for 2.6? | Date | Sun, 7 Mar 2004 14:19:36 +0100 |
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On Sunday 07 March 2004 13:59, Pavel Machek wrote:
Hi Pavel,
> Does anyone have `subj`? something like attached patch? Only for x86 now. Ontop of 2.6.4-rc1-mm2.
ciao, Marc --- old/include/asm-i386/setup.h 2004-02-26 01:29:43.000000000 +0100 +++ 2.6.4-rc1-mm2/include/asm-i386/setup.h 2004-03-07 14:08:33.000000000 +0100 @@ -13,7 +13,21 @@ /* * Reserved space for vmalloc and iomap - defined in asm/page.h */ +#ifdef CONFIG_HIGHMEM_EMULATION +#define ORDER_DOWN(x) ((x >> (MAX_ORDER-1)) << (MAX_ORDER-1)) +#define MAXMEM_PFN \ +({ \ + int __max_pfn; \ + if (max_pfn > PFN_DOWN(MAXMEM)) \ + __max_pfn = PFN_DOWN(MAXMEM); \ + else \ + __max_pfn = ORDER_DOWN(max_pfn / 5); \ + __max_pfn; \ +)} +#else #define MAXMEM_PFN PFN_DOWN(MAXMEM) +#endif + #define MAX_NONPAE_PFN (1 << 20) /* --- old/arch/i386/Kconfig 2004-03-05 17:16:45.000000000 +0100 +++ 2.6.4-rc1-mm2/arch/i386/Kconfig 2004-03-07 14:11:57.000000000 +0100 @@ -773,6 +773,19 @@ config X86_PAE depends on HIGHMEM64G default y +config HIGHMEM_EMULATION + bool ' Emulate HIGHMEM on lowmem machines' + depends on HIGHMEM + default n + ---help--- + Really obvious. With this option turned on and also selecting + High Memory Support (4GB||64GB) you can emulate HIGHMEM on lowmem + mashines. This does nothing usefull, nothing speed improvement + or anything else but helps you to debug HIGHMEM code on lowmem + mashines. + + If unsure, say N. + # Common NUMA Features config NUMA bool "Numa Memory Allocation Support" | |