diff options
Diffstat (limited to 'include/linux/vmstat.h')
| -rw-r--r-- | include/linux/vmstat.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h new file mode 100644 index 00000000000..3ca0c1989fc --- /dev/null +++ b/include/linux/vmstat.h @@ -0,0 +1,138 @@ +#ifndef _LINUX_VMSTAT_H +#define _LINUX_VMSTAT_H + +#include <linux/types.h> +#include <linux/percpu.h> + +/* + * Global page accounting. One instance per CPU. Only unsigned longs are + * allowed. + * + * - Fields can be modified with xxx_page_state and xxx_page_state_zone at + * any time safely (which protects the instance from modification by + * interrupt. + * - The __xxx_page_state variants can be used safely when interrupts are + * disabled. + * - The __xxx_page_state variants can be used if the field is only + * modified from process context and protected from preemption, or only + * modified from interrupt context. In this case, the field should be + * commented here. + */ +struct page_state { + unsigned long nr_dirty; /* Dirty writeable pages */ + unsigned long nr_writeback; /* Pages under writeback */ + unsigned long nr_unstable; /* NFS unstable pages */ + unsigned long nr_page_table_pages;/* Pages used for pagetables */ + unsigned long nr_mapped; /* mapped into pagetables. + * only modified from process context */ + unsigned long nr_slab; /* In slab */ +#define GET_PAGE_STATE_LAST nr_slab + + /* + * The below are zeroed by get_page_state(). Use get_full_page_state() + * to add up all these. + */ + unsigned long pgpgin; /* Disk reads */ + unsigned long pgpgout; /* Disk writes */ + unsigned long pswpin; /* swap reads */ + unsigned long pswpout; /* swap writes */ + + unsigned long pgalloc_high; /* page allocations */ + unsigned long pgalloc_normal; + unsigned long pgalloc_dma32; + unsigned long pgalloc_dma; + + unsigned long pgfree; /* page freeings */ + unsigned long pgactivate; /* pages moved inactive->active */ + unsigned long pgdeactivate; /* pages moved active->inactive */ + + unsigned long pgfault; /* faults (major+minor) */ + unsigned long pgmajfault; /* faults (major only) */ + + unsigned long pgrefill_high; /* inspected in refill_inactive_zone */ + unsigned long pgrefill_normal; + unsigned long pgrefill_dma32; + unsigned long pgrefill_dma; + + unsigned long pgsteal_high; /* total highmem pages reclaimed */ + unsigned long pgsteal_normal; + unsigned long pgsteal_dma32; + unsigned long pgsteal_dma; + + unsigned long pgscan_kswapd_high;/* total highmem pages scanned */ + unsigned long pgscan_kswapd_normal; + unsigned long pgscan_kswapd_dma32; + unsigned long pgscan_kswapd_dma; + + unsigned long pgscan_direct_high;/* total highmem pages scanned */ + unsigned long pgscan_direct_normal; + unsigned long pgscan_direct_dma32; + unsigned long pgscan_direct_dma; + + unsigned long pginodesteal; /* pages reclaimed via inode freeing */ + unsigned long slabs_scanned; /* slab objects scanned */ + unsigned long kswapd_steal; /* pages reclaimed by kswapd */ + unsigned long kswapd_inodesteal;/* reclaimed via kswapd inode freeing */ + unsigned long pageoutrun; /* kswapd's calls to page reclaim */ + unsigned long allocstall; /* direct reclaim calls */ + + unsigned long pgrotated; /* pages rotated to tail of the LRU */ + unsigned long nr_bounce; /* pages for bounce buffers */ +}; + +extern void get_page_state(struct page_state *ret); +extern void get_page_state_node(struct page_state *ret, int node); +extern void get_full_page_state(struct page_state *ret); +extern unsigned long read_page_state_offset(unsigned long offset); +extern void mod_page_state_offset(unsigned long offset, unsigned long delta); +extern void __mod_page_state_offset(unsigned long offset, unsigned long delta); + +#define read_page_state(member) \ + read_page_state_offset(offsetof(struct page_state, member)) + +#define mod_page_state(member, delta) \ + mod_page_state_offset(offsetof(struct page_state, member), (delta)) + +#define __mod_page_state(member, delta) \ + __mod_page_state_offset(offsetof(struct page_state, member), (delta)) + +#define inc_page_state(member) mod_page_state(member, 1UL) +#define dec_page_state(member) mod_page_state(member, 0UL - 1) +#define add_page_state(member,delta) mod_page_state(member, (delta)) +#define sub_page_state(member,delta) mod_page_state(member, 0UL - (delta)) + +#define __inc_page_state(member) __mod_page_state(member, 1UL) +#define __dec_page_state(member) __mod_page_state(member, 0UL - 1) +#define __add_page_state(member,delta) __mod_page_state(member, (delta)) +#define __sub_page_state(member,delta) __mod_page_state(member, 0UL - (delta)) + +#define page_state(member) (*__page_state(offsetof(struct page_state, member))) + +#define state_zone_offset(zone, member) \ +({ \ + unsigned offset; \ + if (is_highmem(zone)) \ + offset = offsetof(struct page_state, member##_high); \ + else if (is_normal(zone)) \ + offset = offsetof(struct page_state, member##_normal); \ + else if (is_dma32(zone)) \ + offset = offsetof(struct page_state, member##_dma32); \ + else \ + offset = offsetof(struct page_state, member##_dma); \ + offset; \ +}) + +#define __mod_page_state_zone(zone, member, delta) \ + do { \ + __mod_page_state_offset(state_zone_offset(zone, member), (delta)); \ + } while (0) + +#define mod_page_state_zone(zone, member, delta) \ + do { \ + mod_page_state_offset(state_zone_offset(zone, member), (delta)); \ + } while (0) + +DECLARE_PER_CPU(struct page_state, page_states); + +#endif /* _LINUX_VMSTAT_H */ + |