Messages in this thread Patch in this message | | | Date | Tue, 15 Sep 2009 21:38:21 +0100 (BST) | From | Hugh Dickins <> | Subject | [PATCH 4/4] mm: move highest_memmap_pfn |
| |
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> ---
mm/internal.h | 3 ++- mm/memory.c | 1 + mm/page_alloc.c | 1 - 3 files changed, 3 insertions(+), 2 deletions(-)
--- mm3/mm/internal.h 2009-09-14 16:34:37.000000000 +0100 +++ mm4/mm/internal.h 2009-09-15 17:32:27.000000000 +0100 @@ -37,6 +37,8 @@ static inline void __put_page(struct pag 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 /* * 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); --- mm3/mm/memory.c 2009-09-15 17:32:19.000000000 +0100 +++ mm4/mm/memory.c 2009-09-15 17:32:27.000000000 +0100 @@ -108,6 +108,7 @@ static int __init disable_randmaps(char __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() --- mm3/mm/page_alloc.c 2009-09-14 16:34:37.000000000 +0100 +++ mm4/mm/page_alloc.c 2009-09-15 17:32:27.000000000 +0100 @@ -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;
| |