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mm: move highest_memmap_pfn

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Move highest_memmap_pfn __read_mostly from page_alloc.c next to zero_pfn
__read_mostly in memory.c: to help them share a cacheline, since they're
very often tested together in vm_normal_page().

Signed-off-by: Hugh Dickins <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Hugh Dickins 2009-09-21 17:03:35 -07:00 • committed by Linus Torvalds
commit 03f6462a3a
3 changed files with 3 additions and 2 deletions
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3
mm/internal.h
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@ -37,6 +37,8 @@ static inline void __put_page(struct page *page)
atomic_dec(&page->_count);
}
extern unsigned long highest_memmap_pfn;
/*
* in mm/vmscan.c:
*/
@ -46,7 +48,6 @@ extern void putback_lru_page(struct page *page);
/*
* in mm/page_alloc.c
*/
extern unsigned long highest_memmap_pfn;
extern void __free_pages_bootmem(struct page *page, unsigned int order);
extern void prep_compound_page(struct page *page, unsigned long order);