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    Subject[23/41] compound pages: vmstat support
    Add support for compound pages so that

    inc_xxxx_state() and dec_xxx_state()

    will increment the ZVCs by the number of base pages of the compound page.

    Signed-off-by: Christoph Lameter <clameter@sgi.com>
    ---
    include/linux/vmstat.h | 5 ++---
    mm/vmstat.c | 18 +++++++++++++-----
    2 files changed, 15 insertions(+), 8 deletions(-)

    diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
    index 75370ec..6d03a5a 100644
    --- a/include/linux/vmstat.h
    +++ b/include/linux/vmstat.h
    @@ -234,7 +234,7 @@ static inline void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
    static inline void __inc_zone_page_state(struct page *page,
    enum zone_stat_item item)
    {
    - __inc_zone_state(page_zone(page), item);
    + __mod_zone_page_state(page_zone(page), item, compound_pages(page));
    }

    static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
    @@ -246,8 +246,7 @@ static inline void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
    static inline void __dec_zone_page_state(struct page *page,
    enum zone_stat_item item)
    {
    - atomic_long_dec(&page_zone(page)->vm_stat[item]);
    - atomic_long_dec(&vm_stat[item]);
    + __mod_zone_page_state(page_zone(page), item, -compound_pages(page));
    }

    /*
    diff --git a/mm/vmstat.c b/mm/vmstat.c
    index c64d169..3e07215 100644
    --- a/mm/vmstat.c
    +++ b/mm/vmstat.c
    @@ -225,7 +225,12 @@ void __inc_zone_state(struct zone *zone, enum zone_stat_item item)

    void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
    {
    - __inc_zone_state(page_zone(page), item);
    + struct zone *z = page_zone(page);
    +
    + if (likely(!PageHead(page)))
    + __inc_zone_state(z, item);
    + else
    + __mod_zone_page_state(z, item, compound_pages(page));
    }
    EXPORT_SYMBOL(__inc_zone_page_state);

    @@ -246,7 +251,12 @@ void __dec_zone_state(struct zone *zone, enum zone_stat_item item)

    void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
    {
    - __dec_zone_state(page_zone(page), item);
    + struct zone *z = page_zone(page);
    +
    + if (likely(!PageHead(page)))
    + __dec_zone_state(z, item);
    + else
    + __mod_zone_page_state(z, item, -compound_pages(page));
    }
    EXPORT_SYMBOL(__dec_zone_page_state);

    @@ -262,11 +272,9 @@ void inc_zone_state(struct zone *zone, enum zone_stat_item item)
    void inc_zone_page_state(struct page *page, enum zone_stat_item item)
    {
    unsigned long flags;
    - struct zone *zone;

    - zone = page_zone(page);
    local_irq_save(flags);
    - __inc_zone_state(zone, item);
    + __inc_zone_page_state(page, item);
    local_irq_restore(flags);
    }
    EXPORT_SYMBOL(inc_zone_page_state);
    --
    1.5.2.5
    --
    -
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