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mm: don't drop a partial page in a zone's memory map size

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In a zone's present pages number, account for all pages occupied by the
memory map, including a partial.

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2008-05-23 13:04:21 -07:00 committed by Linus Torvalds
parent f899b0adc6
commit f723215419
1 changed files with 2 additions and 1 deletions
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3
mm/page_alloc.c
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@ -3378,7 +3378,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
* is used by this zone for memmap. This affects the watermark
* and per-cpu initialisations
*/
memmap_pages = (size * sizeof(struct page)) >> PAGE_SHIFT;
memmap_pages =
PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT;
if (realsize >= memmap_pages) {
realsize -= memmap_pages;
printk(KERN_DEBUG