#include <asm/div64.h>
#include <linux/swapops.h>
+#include <linux/ckrm_mem.h>
+
+#ifndef AT_LIMIT_SUPPORT
+#warning "ckrm_at_limit disabled due to problems with memory hog tests -- seting ckrm_shrink_list_empty to true"
+#undef ckrm_shrink_list_empty
+#define ckrm_shrink_list_empty() (1)
+#endif
/* possible outcome of pageout() */
typedef enum {
/* This context's GFP mask */
unsigned int gfp_mask;
+ /* Flag used by CKRM */
+ unsigned int ckrm_flags;
+
int may_writepage;
};
long nr; /* objs pending delete */
};
+
+
+void try_to_clip_inodes(void);
+
+
#define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
#ifdef ARCH_HAS_PREFETCH
int may_enter_fs;
int referenced;
+ cond_resched();
+
page = lru_to_page(page_list);
list_del(&page->lru);
{
LIST_HEAD(page_list);
struct pagevec pvec;
- int max_scan = sc->nr_to_scan;
+ int max_scan = sc->nr_to_scan, nr_pass;
+ unsigned int ckrm_flags = sc->ckrm_flags, bit_flag;
pagevec_init(&pvec, 1);
lru_add_drain();
spin_lock_irq(&zone->lru_lock);
+redo:
+ ckrm_get_reclaim_bits(&ckrm_flags, &bit_flag);
+ nr_pass = zone->nr_inactive;
while (max_scan > 0) {
struct page *page;
int nr_taken = 0;
int nr_scan = 0;
int nr_freed;
- while (nr_scan++ < SWAP_CLUSTER_MAX &&
+ while (nr_pass-- && nr_scan++ < SWAP_CLUSTER_MAX &&
!list_empty(&zone->inactive_list)) {
page = lru_to_page(&zone->inactive_list);
SetPageLRU(page);
list_add(&page->lru, &zone->inactive_list);
continue;
+ } else if (bit_flag && !ckrm_kick_page(page, bit_flag)) {
+ __put_page(page);
+ SetPageLRU(page);
+#ifdef CONFIG_CKRM_MEM_LRUORDER_CHANGE
+ list_add_tail(&page->lru, &zone->inactive_list);
+#else
+ list_add(&page->lru, &zone->inactive_list);
+#endif
+ continue;
}
list_add(&page->lru, &page_list);
+ ckrm_mem_dec_inactive(page);
nr_taken++;
}
zone->nr_inactive -= nr_taken;
zone->pages_scanned += nr_taken;
spin_unlock_irq(&zone->lru_lock);
- if (nr_taken == 0)
+ if ((bit_flag == 0) && (nr_taken == 0))
goto done;
max_scan -= nr_scan;
spin_lock_irq(&zone->lru_lock);
}
}
+ if (ckrm_flags && (nr_pass <= 0)) {
+ goto redo;
+ }
}
spin_unlock_irq(&zone->lru_lock);
done:
long mapped_ratio;
long distress;
long swap_tendency;
+ unsigned int ckrm_flags = sc->ckrm_flags, bit_flag;
+ int nr_pass;
lru_add_drain();
pgmoved = 0;
spin_lock_irq(&zone->lru_lock);
- while (pgscanned < nr_pages && !list_empty(&zone->active_list)) {
+redo:
+ ckrm_get_reclaim_bits(&ckrm_flags, &bit_flag);
+ nr_pass = zone->nr_active;
+ while (pgscanned < nr_pages && !list_empty(&zone->active_list) &&
+ nr_pass) {
page = lru_to_page(&zone->active_list);
prefetchw_prev_lru_page(page, &zone->active_list, flags);
if (!TestClearPageLRU(page))
__put_page(page);
SetPageLRU(page);
list_add(&page->lru, &zone->active_list);
+ pgscanned++;
+ } else if (bit_flag && !ckrm_kick_page(page, bit_flag)) {
+ __put_page(page);
+ SetPageLRU(page);
+#ifdef CONFIG_CKRM_MEM_LRUORDER_CHANGE
+ list_add_tail(&page->lru, &zone->active_list);
+#else
+ list_add(&page->lru, &zone->active_list);
+#endif
} else {
list_add(&page->lru, &l_hold);
+ ckrm_mem_dec_active(page);
pgmoved++;
+ pgscanned++;
+ }
+ if (!--nr_pass && ckrm_flags) {
+ goto redo;
}
- pgscanned++;
}
zone->nr_active -= pgmoved;
spin_unlock_irq(&zone->lru_lock);
reclaim_mapped = 1;
while (!list_empty(&l_hold)) {
+ cond_resched();
page = lru_to_page(&l_hold);
list_del(&page->lru);
if (page_mapped(page)) {
if (!TestClearPageActive(page))
BUG();
list_move(&page->lru, &zone->inactive_list);
+ ckrm_mem_inc_inactive(page);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
zone->nr_inactive += pgmoved;
BUG();
BUG_ON(!PageActive(page));
list_move(&page->lru, &zone->active_list);
+ ckrm_mem_inc_active(page);
pgmoved++;
if (!pagevec_add(&pvec, page)) {
zone->nr_active += pgmoved;
sc->nr_to_reclaim = SWAP_CLUSTER_MAX;
while (nr_active || nr_inactive) {
+ sc->ckrm_flags = ckrm_setup_reclamation();
if (nr_active) {
sc->nr_to_scan = min(nr_active,
(unsigned long)SWAP_CLUSTER_MAX);
if (sc->nr_to_reclaim <= 0)
break;
}
+ ckrm_teardown_reclamation();
+ }
+}
+
+#if defined(CONFIG_CKRM_RES_MEM) && defined(AT_LIMIT_SUPPORT)
+// This function needs to be given more thought.
+// Shrink the class to be at 90% of its limit
+static void
+ckrm_shrink_class(ckrm_mem_res_t *cls)
+{
+ struct scan_control sc;
+ struct zone *zone;
+ int zindex = 0, active_credit = 0, inactive_credit = 0;
+
+ if (ckrm_test_set_shrink(cls)) { // set the SHRINK bit atomically
+ // if it is already set somebody is working on it. so... leave
+ return;
+ }
+ sc.nr_mapped = read_page_state(nr_mapped);
+ sc.nr_scanned = 0;
+ sc.ckrm_flags = ckrm_get_reclaim_flags(cls);
+ sc.nr_reclaimed = 0;
+ sc.priority = 0; // always very high priority
+
+ for_each_zone(zone) {
+ int zone_total, zone_limit, active_limit, inactive_limit;
+ int active_over, inactive_over;
+ unsigned long nr_active, nr_inactive;
+ u64 temp;
+
+ zone->temp_priority = zone->prev_priority;
+ zone->prev_priority = sc.priority;
+
+ zone_total = zone->nr_active + zone->nr_inactive + zone->free_pages;
+
+ temp = (u64) cls->pg_limit * zone_total;
+ do_div(temp, ckrm_tot_lru_pages);
+ zone_limit = (int) temp;
+ active_limit = (6 * zone_limit) / 10; // 2/3rd in active list
+ inactive_limit = (3 * zone_limit) / 10; // 1/3rd in inactive list
+
+ active_over = cls->nr_active[zindex] - active_limit + active_credit;
+ inactive_over = active_over +
+ (cls->nr_inactive[zindex] - inactive_limit) + inactive_credit;
+
+ if (active_over > 0) {
+ zone->nr_scan_active += active_over + 1;
+ nr_active = zone->nr_scan_active;
+ active_credit = 0;
+ } else {
+ active_credit += active_over;
+ nr_active = 0;
+ }
+
+ if (inactive_over > 0) {
+ zone->nr_scan_inactive += inactive_over;
+ nr_inactive = zone->nr_scan_inactive;
+ inactive_credit = 0;
+ } else {
+ inactive_credit += inactive_over;
+ nr_inactive = 0;
+ }
+ while (nr_active || nr_inactive) {
+ if (nr_active) {
+ sc.nr_to_scan = min(nr_active,
+ (unsigned long)SWAP_CLUSTER_MAX);
+ nr_active -= sc.nr_to_scan;
+ refill_inactive_zone(zone, &sc);
+ }
+
+ if (nr_inactive) {
+ sc.nr_to_scan = min(nr_inactive,
+ (unsigned long)SWAP_CLUSTER_MAX);
+ nr_inactive -= sc.nr_to_scan;
+ shrink_cache(zone, &sc);
+ if (sc.nr_to_reclaim <= 0)
+ break;
+ }
+ }
+ zone->prev_priority = zone->temp_priority;
+ zindex++;
}
+ ckrm_clear_shrink(cls);
}
+static void
+ckrm_shrink_classes(void)
+{
+ ckrm_mem_res_t *cls;
+
+ spin_lock(&ckrm_mem_lock);
+ while (!ckrm_shrink_list_empty()) {
+ cls = list_entry(ckrm_shrink_list.next, ckrm_mem_res_t,
+ shrink_list);
+ spin_unlock(&ckrm_mem_lock);
+ ckrm_shrink_class(cls);
+ spin_lock(&ckrm_mem_lock);
+ list_del(&cls->shrink_list);
+ cls->flags &= ~MEM_AT_LIMIT;
+ }
+ spin_unlock(&ckrm_mem_lock);
+}
+
+#else
+
+#if defined(CONFIG_CKRM_RES_MEM) && !defined(AT_LIMIT_SUPPORT)
+#warning "disabling ckrm_at_limit -- setting ckrm_shrink_classes to noop "
+#endif
+
+#define ckrm_shrink_classes() do { } while(0)
+#endif
+
/*
* This is the direct reclaim path, for page-allocating processes. We only
* try to reclaim pages from zones which will satisfy the caller's allocation
prepare_to_wait(&pgdat->kswapd_wait, &wait, TASK_INTERRUPTIBLE);
schedule();
finish_wait(&pgdat->kswapd_wait, &wait);
+ try_to_clip_inodes();
+ if (!ckrm_shrink_list_empty())
+ ckrm_shrink_classes();
+ else
balance_pgdat(pgdat, 0);
}
return 0;
*/
void wakeup_kswapd(struct zone *zone)
{
- if (zone->free_pages > zone->pages_low)
+ if ((zone->free_pages > zone->pages_low) && ckrm_shrink_list_empty())
return;
if (!waitqueue_active(&zone->zone_pgdat->kswapd_wait))
return;
git://git.onelab.eu / linux-2.6.git / blobdiff