Messages in this thread Patch in this message | | | Subject | [Patch1/4]: fake numa for x86_64 patch | From | Rohit Seth <> | Date | Wed, 22 Nov 2006 17:34:09 -0800 |
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This patch provides a IO hole size in a given address range.
Signed-off-by: David Rientjes <reintjes@google.com> Signed-off-by: Paul Menage <menage@google.com> Signed-off-by: Rohit Seth <rohitseth@google.com>
--- linux-2.6.19-rc5-mm2.org/include/asm-x86_64/e820.h 2006-11-22 12:20:39.000000000 -0800 +++ linux-2.6.19-rc5-mm2/include/asm-x86_64/e820.h 2006-11-22 12:17:25.000000000 -0800 @@ -46,6 +46,7 @@ extern void e820_mark_nosave_regions(voi extern void e820_print_map(char *who); extern int e820_any_mapped(unsigned long start, unsigned long end, unsigned type); extern int e820_all_mapped(unsigned long start, unsigned long end, unsigned type); +extern unsigned long e820_hole_size(unsigned long start, unsigned long end); extern void e820_setup_gap(void); extern void e820_register_active_regions(int nid, --- linux-2.6.19-rc5-mm2.org/arch/x86_64/kernel/e820.c 2006-11-22 12:20:55.000000000 -0800 +++ linux-2.6.19-rc5-mm2/arch/x86_64/kernel/e820.c 2006-11-21 18:48:15.000000000 -0800 @@ -184,6 +184,38 @@ unsigned long __init e820_end_of_ram(voi } /* + * Find the hole size in the range. + */ +unsigned long __init e820_hole_size(unsigned long start, unsigned long end) +{ + unsigned long ram = 0; + int i; + + for (i = 0; i < e820.nr_map; i++) { + struct e820entry *ei = &e820.map[i]; + unsigned long last, addr; + + if (ei->type != E820_RAM || + ei->addr+ei->size <= start || + ei->addr >= end) + continue; + + addr = round_up(ei->addr, PAGE_SIZE); + if (addr < start) + addr = start; + + last = round_down(ei->addr + ei->size, PAGE_SIZE); + if (last >= end) + last = end; + + if (last > addr) + ram += last - addr; + } + return ((end - start) - ram); +} + + +/* * Mark e820 reserved areas as busy for the resource manager. */ void __init e820_reserve_resources(void)
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