diff options
| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2010-03-05 13:41:55 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-03-06 11:26:25 -0800 |
| commit | 93e4a89a8c987189b168a530a331ef6d0fcf07a7 (patch) | |
| tree | deb08017c0e4874539549d3ea9bf2d7b447a43be /mm/page_alloc.c | |
| parent | fc91668eaf9e7ba61e867fc2218b7e9fb67faa4f (diff) | |
| download | linux-93e4a89a8c987189b168a530a331ef6d0fcf07a7.tar.gz linux-93e4a89a8c987189b168a530a331ef6d0fcf07a7.tar.bz2 linux-93e4a89a8c987189b168a530a331ef6d0fcf07a7.zip | |
mm: restore zone->all_unreclaimable to independence word
commit e815af95 ("change all_unreclaimable zone member to flags") changed
all_unreclaimable member to bit flag. But it had an undesireble side
effect. free_one_page() is one of most hot path in linux kernel and
increasing atomic ops in it can reduce kernel performance a bit.
Thus, this patch revert such commit partially. at least
all_unreclaimable shouldn't share memory word with other zone flags.
[akpm@linux-foundation.org: fix patch interaction]
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Huang Shijie <shijie8@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 80bcee0c5034..0734bedabd9c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -530,7 +530,7 @@ static void free_pcppages_bulk(struct zone *zone, int count, int batch_free = 0; spin_lock(&zone->lock); - zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE); + zone->all_unreclaimable = 0; zone->pages_scanned = 0; __mod_zone_page_state(zone, NR_FREE_PAGES, count); @@ -568,7 +568,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order, int migratetype) { spin_lock(&zone->lock); - zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE); + zone->all_unreclaimable = 0; zone->pages_scanned = 0; __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order); @@ -2262,7 +2262,7 @@ void show_free_areas(void) K(zone_page_state(zone, NR_BOUNCE)), K(zone_page_state(zone, NR_WRITEBACK_TEMP)), zone->pages_scanned, - (zone_is_all_unreclaimable(zone) ? "yes" : "no") + (zone->all_unreclaimable ? "yes" : "no") ); printk("lowmem_reserve[]:"); for (i = 0; i < MAX_NR_ZONES; i++) |