/**
* drain_cpu_pagevecs:刷新Per-CPU的页临时缓存
*/
static void drain_cpu_pagevecs(int cpu)
{
struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
struct pagevec *pvec;
int lru;
/*将临时缓存中的每种lru类型的页面刷新到其对应
* 的zone LRU链表中去*/
for_each_lru(lru) {
pvec = &pvecs[lru - LRU_BASE];
if (pagevec_count(pvec))
____pagevec_lru_add(pvec, lru);
}
/*刷新页rotate的临时缓存*/
pvec = &per_cpu(lru_rotate_pvecs, cpu);
if (pagevec_count(pvec)) {
unsigned long flags;
/* No harm done if a racing interrupt already did this */
local_irq_save(flags);
pagevec_move_tail(pvec);
local_irq_restore(flags);
}
}
/*
* Drain pages out of the cpu's pagevecs.
* Either "cpu" is the current CPU, and preemption has already been
* disabled; or "cpu" is being hot-unplugged, and is already dead.
*/
static void drain_cpu_pagevecs(int cpu)
{
struct pagevec *pvecs = per_cpu(lru_add_pvecs, cpu);
struct pagevec *pvec;
int lru;
for_each_lru(lru) {
pvec = &pvecs[lru - LRU_BASE];
if (pagevec_count(pvec))
____pagevec_lru_add(pvec, lru);
}
pvec = &per_cpu(lru_rotate_pvecs, cpu);
if (pagevec_count(pvec)) {
unsigned long flags;
/* No harm done if a racing interrupt already did this */
local_irq_save(flags);
pagevec_move_tail(pvec);
local_irq_restore(flags);
}
pvec = &per_cpu(lru_deactivate_pvecs, cpu);
if (pagevec_count(pvec))
pagevec_lru_move_fn(pvec, lru_deactivate_fn, NULL);
activate_page_drain(cpu);
}
void __lru_cache_add(struct page *page, enum lru_list lru)
{
struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
page_cache_get(page);
if (!pagevec_add(pvec, page))
____pagevec_lru_add(pvec, lru);
put_cpu_var(lru_add_pvecs);
}
void __lru_cache_add(struct page *page, enum lru_list lru)
{
struct pagevec *pvec;
int cpu;
pvec = swap_get_cpu_var(lru_add_pvecs, cpu)[lru];
page_cache_get(page);
if (!pagevec_add(pvec, page))
____pagevec_lru_add(pvec, lru);
swap_put_cpu_var(lru_add_pvecs, cpu);
}
/**
* __lru_cache_add:page加入到lru类型的lru_add_pvecs页缓存中
*/
void __lru_cache_add(struct page *page, enum lru_list lru)
{
struct pagevec *pvec = &get_cpu_var(lru_add_pvecs)[lru];
page_cache_get(page);
/*加入页缓存中,当也缓存满时,才加入到page对应
* 的zone的lru链表中*/
if (!pagevec_add(pvec, page))
____pagevec_lru_add(pvec, lru);
put_cpu_var(lru_add_pvecs);
}
/*
* Drain pages out of the cpu's pagevecs.
* Either "cpu" is the current CPU, and preemption has already been
* disabled; or "cpu" is being hot-unplugged, and is already dead.
*/
static void drain_cpu_pagevecs(int cpu)
{
struct pagevec *pvecs, *pvec;
int lru;
pvecs = swap_per_cpu_lock(lru_add_pvecs, cpu)[0];
for_each_lru(lru) {
pvec = &pvecs[lru - LRU_BASE];
if (pagevec_count(pvec))
____pagevec_lru_add(pvec, lru);
}
swap_per_cpu_unlock(lru_add_pvecs, cpu);
pvec = swap_per_cpu_lock(lru_rotate_pvecs, cpu);
if (pagevec_count(pvec)) {
unsigned long flags;
/* No harm done if a racing interrupt already did this */
swap_irq_save(flags);
pagevec_move_tail(pvec);
swap_irq_restore(flags);
}
swap_per_cpu_unlock(lru_rotate_pvecs, cpu);
}
