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Subject[patch 3/12] mm: release opt
Date
Optimise some pagevec functions by not reenabling irqs while
switching lru locks.

Signed-off-by: Nick Piggin <npiggin@suse.de>

Index: linux-2.6/mm/swap.c
===================================================================
--- linux-2.6.orig/mm/swap.c
+++ linux-2.6/mm/swap.c
@@ -220,10 +220,13 @@ void release_pages(struct page **pages,

pagezone = page_zone(page);
if (pagezone != zone) {
- if (zone)
- spin_unlock_irq(&zone->lru_lock);
+ spin_lock_prefetch(&pagezone->lru_lock);
+ if (!zone)
+ local_irq_disable();
+ else
+ spin_unlock(&zone->lru_lock);
zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
+ spin_lock(&zone->lru_lock);
}
if (TestClearPageLRU(page))
del_page_from_lru(zone, page);
@@ -297,10 +300,12 @@ void __pagevec_lru_add(struct pagevec *p
struct zone *pagezone = page_zone(page);

if (pagezone != zone) {
+ if (!zone)
+ local_irq_disable();
if (zone)
- spin_unlock_irq(&zone->lru_lock);
+ spin_unlock(&zone->lru_lock);
zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
+ spin_lock(&zone->lru_lock);
}
if (TestSetPageLRU(page))
BUG();
@@ -324,10 +329,12 @@ void __pagevec_lru_add_active(struct pag
struct zone *pagezone = page_zone(page);

if (pagezone != zone) {
+ if (!zone)
+ local_irq_disable();
if (zone)
- spin_unlock_irq(&zone->lru_lock);
+ spin_unlock(&zone->lru_lock);
zone = pagezone;
- spin_lock_irq(&zone->lru_lock);
+ spin_lock(&zone->lru_lock);
}
if (TestSetPageLRU(page))
BUG();
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