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authorNick Piggin <nickpiggin@yahoo.com.au>2006-01-08 01:00:42 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:12:40 -0800
commit48db57f8ff10eb09ab887ccb6150b0da0c7be24e (patch)
tree5c9fba3937bb802aa2944af189aae57b7bf7aa8b /mm/page_alloc.c
parent23316bc86fd31c5d644a71c398ec41d9fecacec4 (diff)
downloadop-kernel-dev-48db57f8ff10eb09ab887ccb6150b0da0c7be24e.zip
op-kernel-dev-48db57f8ff10eb09ab887ccb6150b0da0c7be24e.tar.gz
[PATCH] mm: free_pages opt
Try to streamline free_pages_bulk by ensuring callers don't pass in a 'count' that exceeds the list size. Some cleanups: Rename __free_pages_bulk to __free_one_page. Put the page list manipulation from __free_pages_ok into free_one_page. Make __free_pages_ok static. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c58
1 files changed, 30 insertions, 28 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6b92a94..ad3d020 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -308,7 +308,7 @@ static inline int page_is_buddy(struct page *page, int order)
* -- wli
*/
-static inline void __free_pages_bulk (struct page *page,
+static inline void __free_one_page(struct page *page,
struct zone *zone, unsigned int order)
{
unsigned long page_idx;
@@ -383,40 +383,42 @@ static inline int free_pages_check(struct page *page)
* And clear the zone's pages_scanned counter, to hold off the "all pages are
* pinned" detection logic.
*/
-static int
-free_pages_bulk(struct zone *zone, int count,
- struct list_head *list, unsigned int order)
+static void free_pages_bulk(struct zone *zone, int count,
+ struct list_head *list, int order)
{
- struct page *page = NULL;
- int ret = 0;
-
spin_lock(&zone->lock);
zone->all_unreclaimable = 0;
zone->pages_scanned = 0;
- while (!list_empty(list) && count--) {
+ while (count--) {
+ struct page *page;
+
+ BUG_ON(list_empty(list));
page = list_entry(list->prev, struct page, lru);
- /* have to delete it as __free_pages_bulk list manipulates */
+ /* have to delete it as __free_one_page list manipulates */
list_del(&page->lru);
- __free_pages_bulk(page, zone, order);
- ret++;
+ __free_one_page(page, zone, order);
}
spin_unlock(&zone->lock);
- return ret;
}
-void __free_pages_ok(struct page *page, unsigned int order)
+static void free_one_page(struct zone *zone, struct page *page, int order)
{
- unsigned long flags;
LIST_HEAD(list);
+ list_add(&page->lru, &list);
+ free_pages_bulk(zone, 1, &list, order);
+}
+
+static void __free_pages_ok(struct page *page, unsigned int order)
+{
+ unsigned long flags;
int i;
int reserved = 0;
arch_free_page(page, order);
#ifndef CONFIG_MMU
- if (order > 0)
- for (i = 1 ; i < (1 << order) ; ++i)
- __put_page(page + i);
+ for (i = 1 ; i < (1 << order) ; ++i)
+ __put_page(page + i);
#endif
for (i = 0 ; i < (1 << order) ; ++i)
@@ -424,11 +426,10 @@ void __free_pages_ok(struct page *page, unsigned int order)
if (reserved)
return;
- list_add(&page->lru, &list);
- kernel_map_pages(page, 1<<order, 0);
+ kernel_map_pages(page, 1 << order, 0);
local_irq_save(flags);
__mod_page_state(pgfree, 1 << order);
- free_pages_bulk(page_zone(page), 1, &list, order);
+ free_one_page(page_zone(page), page, order);
local_irq_restore(flags);
}
@@ -602,9 +603,8 @@ void drain_remote_pages(void)
struct per_cpu_pages *pcp;
pcp = &pset->pcp[i];
- if (pcp->count)
- pcp->count -= free_pages_bulk(zone, pcp->count,
- &pcp->list, 0);
+ free_pages_bulk(zone, pcp->count, &pcp->list, 0);
+ pcp->count = 0;
}
}
local_irq_restore(flags);
@@ -627,8 +627,8 @@ static void __drain_pages(unsigned int cpu)
pcp = &pset->pcp[i];
local_irq_save(flags);
- pcp->count -= free_pages_bulk(zone, pcp->count,
- &pcp->list, 0);
+ free_pages_bulk(zone, pcp->count, &pcp->list, 0);
+ pcp->count = 0;
local_irq_restore(flags);
}
}
@@ -719,8 +719,10 @@ static void fastcall free_hot_cold_page(struct page *page, int cold)
__inc_page_state(pgfree);
list_add(&page->lru, &pcp->list);
pcp->count++;
- if (pcp->count >= pcp->high)
- pcp->count -= free_pages_bulk(zone, pcp->batch, &pcp->list, 0);
+ if (pcp->count >= pcp->high) {
+ free_pages_bulk(zone, pcp->batch, &pcp->list, 0);
+ pcp->count -= pcp->batch;
+ }
local_irq_restore(flags);
put_cpu();
}
@@ -759,7 +761,7 @@ static struct page *buffered_rmqueue(struct zonelist *zonelist,
again:
cpu = get_cpu();
- if (order == 0) {
+ if (likely(order == 0)) {
struct per_cpu_pages *pcp;
pcp = &zone_pcp(zone, cpu)->pcp[cold];
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