[PATCH] modularization of mem_init() for 2.4.19pre8

From: Patricia Gaughen (gone@us.ibm.com)
Date: Wed May 08 2002 - 19:19:27 EST


Please consider this patch for inclusion into the next 2.4 release.
It was accepted into the 2.4.19pre6aa1, with slight modifications
by Andrea that I have incorporated into this version of my patch.

This patch restructures the mem_init() code to make it easier to
include the i386 numa changes (for CONFIG_DISCONTIGMEM) I've been
working on.

I'm also submitting a patch for setup_arch(), the two patches do not
depend on each other, but my discontigmem patch does depend on both.

All of the above mentioned patches are available at:

http://sourceforge.net/project/showfiles.php?group_id=8875&release_id=87263

I've booted with the patches on the following systems:

UP system
4 Proc SMP system
8 Proc NUMA system

Feedback regarding these patches is greatly appreciated.

Thanks,
Pat

-- 
Patricia Gaughen (gone@us.ibm.com)
IBM Linux Technology Center
http://www.ibm.com/linux/ltc/

--- linux-2.4.19pre8/arch/i386/mm/init.c Tue May 7 11:54:04 2002 +++ linux-2.4.19pre8-cleanup/arch/i386/mm/init.c Tue May 7 15:39:04 2002 @@ -444,18 +444,58 @@ return 0; } -void __init mem_init(void) +void __init init_one_highpage(struct page *page, int pfn, int bad_ppro) +{ + if (!page_is_ram(pfn)) { + SetPageReserved(page); + return; + } + + if (bad_ppro && page_kills_ppro(pfn)) { + SetPageReserved(page); + return; + } + + ClearPageReserved(page); + set_bit(PG_highmem, &page->flags); + atomic_set(&page->count, 1); + __free_page(page); + totalhigh_pages++; +} + +static int __init mem_init_free_pages(void) { extern int ppro_with_ram_bug(void); + int bad_ppro, reservedpages, pfn; + + bad_ppro = ppro_with_ram_bug(); + + /* this will put all low memory onto the freelists */ + totalram_pages += free_all_bootmem(); + + reservedpages = 0; + for (pfn = 0; pfn < max_low_pfn; pfn++) { + /* + * Only count reserved RAM pages + */ + if (page_is_ram(pfn) && PageReserved(mem_map+pfn)) + reservedpages++; + } +#ifdef CONFIG_HIGHMEM + for (pfn = highend_pfn-1; pfn >= highstart_pfn; pfn--) + init_one_highpage((struct page *) (mem_map + pfn), pfn, bad_ppro); + totalram_pages += totalhigh_pages; +#endif + return reservedpages; +} + +void __init mem_init(void) +{ int codesize, reservedpages, datasize, initsize; - int tmp; - int bad_ppro; if (!mem_map) BUG(); - bad_ppro = ppro_with_ram_bug(); - #ifdef CONFIG_HIGHMEM highmem_start_page = mem_map + highstart_pfn; max_mapnr = num_physpages = highend_pfn; @@ -468,37 +508,8 @@ /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); - /* this will put all low memory onto the freelists */ - totalram_pages += free_all_bootmem(); - - reservedpages = 0; - for (tmp = 0; tmp < max_low_pfn; tmp++) - /* - * Only count reserved RAM pages - */ - if (page_is_ram(tmp) && PageReserved(mem_map+tmp)) - reservedpages++; -#ifdef CONFIG_HIGHMEM - for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { - struct page *page = mem_map + tmp; + reservedpages = mem_init_free_pages(); - if (!page_is_ram(tmp)) { - SetPageReserved(page); - continue; - } - if (bad_ppro && page_kills_ppro(tmp)) - { - SetPageReserved(page); - continue; - } - ClearPageReserved(page); - set_bit(PG_highmem, &page->flags); - atomic_set(&page->count, 1); - __free_page(page); - totalhigh_pages++; - } - totalram_pages += totalhigh_pages; -#endif codesize = (unsigned long) &_etext - (unsigned long) &_text; datasize = (unsigned long) &_edata - (unsigned long) &_etext; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;

- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Tue May 14 2002 - 12:00:10 EST