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#ifndef _LINUX_SWAPCTL_H
#define _LINUX_SWAPCTL_H
#include <asm/page.h>
#include <linux/fs.h>
/* Swap tuning control */
/* First, enumerate the different reclaim policies */
enum RCL_POLICY {RCL_ROUND_ROBIN, RCL_BUFF_FIRST, RCL_PERSIST};
typedef struct swap_control_v5
{
unsigned int sc_max_page_age;
unsigned int sc_page_advance;
unsigned int sc_page_decline;
unsigned int sc_page_initial_age;
unsigned int sc_max_buff_age;
unsigned int sc_buff_advance;
unsigned int sc_buff_decline;
unsigned int sc_buff_initial_age;
unsigned int sc_age_cluster_fract;
unsigned int sc_age_cluster_min;
unsigned int sc_pageout_weight;
unsigned int sc_bufferout_weight;
unsigned int sc_buffer_grace;
unsigned int sc_nr_buffs_to_free;
unsigned int sc_nr_pages_to_free;
enum RCL_POLICY sc_policy;
} swap_control_v5;
typedef struct swap_control_v5 swap_control_t;
extern swap_control_t swap_control;
typedef struct swapstat_v1
{
unsigned int wakeups;
unsigned int pages_reclaimed;
unsigned int pages_shm;
unsigned int pages_mmap;
unsigned int pages_swap;
} swapstat_v1;
typedef swapstat_v1 swapstat_t;
extern swapstat_t swapstats;
extern int min_free_pages, free_pages_low, free_pages_high;
#define SC_VERSION 1
#define SC_MAX_VERSION 1
#ifdef __KERNEL__
/* Define the maximum (least urgent) priority for the page reclaim code */
#define RCL_MAXPRI 6
/* We use an extra priority in the swap accounting code to represent
failure to free a resource at any priority */
#define RCL_FAILURE (RCL_MAXPRI + 1)
#define RCL_POLICY (swap_control.sc_policy)
#define AGE_CLUSTER_FRACT (swap_control.sc_age_cluster_fract)
#define AGE_CLUSTER_MIN (swap_control.sc_age_cluster_min)
#define PAGEOUT_WEIGHT (swap_control.sc_pageout_weight)
#define BUFFEROUT_WEIGHT (swap_control.sc_bufferout_weight)
#define NR_BUFFS_TO_FREE (swap_control.sc_nr_buffs_to_free)
#define NR_PAGES_TO_FREE (swap_control.sc_nr_pages_to_free)
#define BUFFERMEM_GRACE (swap_control.sc_buffer_grace)
/* Page aging (see mm/swap.c) */
#define MAX_PAGE_AGE (swap_control.sc_max_page_age)
#define PAGE_ADVANCE (swap_control.sc_page_advance)
#define PAGE_DECLINE (swap_control.sc_page_decline)
#define PAGE_INITIAL_AGE (swap_control.sc_page_initial_age)
#define MAX_BUFF_AGE (swap_control.sc_max_buff_age)
#define BUFF_ADVANCE (swap_control.sc_buff_advance)
#define BUFF_DECLINE (swap_control.sc_buff_decline)
#define BUFF_INITIAL_AGE (swap_control.sc_buff_initial_age)
/* Given a resource of N units (pages or buffers etc), we only try to
* age and reclaim AGE_CLUSTER_FRACT per 1024 resources each time we
* scan the resource list. */
static inline int AGE_CLUSTER_SIZE(int resources)
{
unsigned int n = (resources * AGE_CLUSTER_FRACT) >> 10;
if (n < AGE_CLUSTER_MIN)
return AGE_CLUSTER_MIN;
else
return n;
}
static inline void touch_page(struct page *page)
{
if (page->age < (MAX_PAGE_AGE - PAGE_ADVANCE))
page->age += PAGE_ADVANCE;
else
page->age = MAX_PAGE_AGE;
}
static inline void age_page(struct page *page)
{
if (page->age > PAGE_DECLINE)
page->age -= PAGE_DECLINE;
else
page->age = 0;
}
static inline int age_of(unsigned long addr)
{
return mem_map[MAP_NR(addr)].age;
}
static inline void set_page_new(unsigned long addr)
{
mem_map[MAP_NR(addr)].age = PAGE_INITIAL_AGE;
}
#endif /* __KERNEL */
#endif /* _LINUX_SWAPCTL_H */
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