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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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