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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 <hugh.dickins@tiscali.co.uk>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Nick Piggin <npiggin@suse.de>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2009-09-21 17:03:35 -07:00 committed by Linus Torvalds
parent 62eede62da
commit 03f6462a3a
3 changed files with 3 additions and 2 deletions
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3
mm/internal.h
View File

@ -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);

1
mm/memory.c
View File

@ -109,6 +109,7 @@ static int __init disable_randmaps(char *s)
__setup("norandmaps", disable_randmaps);
unsigned long zero_pfn __read_mostly;
unsigned long highest_memmap_pfn __read_mostly;
/*
* CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()

1
mm/page_alloc.c
View File

@ -72,7 +72,6 @@ EXPORT_SYMBOL(node_states);
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
unsigned long highest_memmap_pfn __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;