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    DateMon, 10 Sep 2007 23:04:13 -0700
    FromChristoph Lameter <>
    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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