Provide a function to generically release pages that were isolated back
to the LRU. The function supports mixing zones etc.
Signed-off-by: Christoph Lameter <[email protected]>
---
mm/vmscan.c | 72 ++++++++++++++++++++++++++++++++++--------------------------
1 file changed, 41 insertions(+), 31 deletions(-)
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c 2007-08-19 23:12:43.000000000 -0700
+++ linux-2.6/mm/vmscan.c 2007-08-19 23:13:24.000000000 -0700
@@ -581,6 +581,42 @@ keep:
return nr_reclaimed;
}
+/*
+ * Put back any unfreeable pages.
+ */
+void release_lru_pages(struct list_head *page_list)
+{
+ struct page *page;
+ struct pagevec pvec;
+ struct zone *zone = NULL;
+
+ pagevec_init(&pvec, 1);
+ while (!list_empty(page_list)) {
+ page = lru_to_page(page_list);
+ VM_BUG_ON(PageLRU(page));
+ if (zone != page_zone(page)) {
+ if (zone)
+ spin_unlock_irq(&zone->lru_lock);
+ zone = page_zone(page);
+ spin_lock_irq(&zone->lru_lock);
+ }
+ SetPageLRU(page);
+ list_del(&page->lru);
+ if (PageActive(page))
+ add_page_to_active_list(zone, page);
+ else
+ add_page_to_inactive_list(zone, page);
+ if (!pagevec_add(&pvec, page)) {
+ spin_unlock_irq(&zone->lru_lock);
+ __pagevec_release(&pvec);
+ spin_lock_irq(&zone->lru_lock);
+ }
+ }
+ if (zone)
+ spin_unlock_irq(&zone->lru_lock);
+ pagevec_release(&pvec);
+}
+
/* LRU Isolation modes. */
#define ISOLATE_INACTIVE 0 /* Isolate inactive pages. */
#define ISOLATE_ACTIVE 1 /* Isolate active pages. */
@@ -756,21 +792,17 @@ static unsigned long shrink_inactive_lis
struct zone *zone, struct scan_control *sc)
{
LIST_HEAD(page_list);
- struct pagevec pvec;
unsigned long nr_scanned = 0;
unsigned long nr_reclaimed = 0;
- pagevec_init(&pvec, 1);
-
lru_add_drain();
- spin_lock_irq(&zone->lru_lock);
do {
- struct page *page;
unsigned long nr_taken;
unsigned long nr_scan;
unsigned long nr_freed;
unsigned long nr_active;
+ spin_lock_irq(&zone->lru_lock);
nr_taken = isolate_lru_pages(sc->swap_cluster_max,
&zone->inactive_list,
&page_list, &nr_scan, sc->order,
@@ -794,34 +826,12 @@ static unsigned long shrink_inactive_lis
} else
__count_zone_vm_events(PGSCAN_DIRECT, zone, nr_scan);
__count_zone_vm_events(PGSTEAL, zone, nr_freed);
+ local_irq_enable();
+ release_lru_pages(&page_list);
- if (nr_taken == 0)
- goto done;
-
- spin_lock(&zone->lru_lock);
- /*
- * Put back any unfreeable pages.
- */
- while (!list_empty(&page_list)) {
- page = lru_to_page(&page_list);
- VM_BUG_ON(PageLRU(page));
- SetPageLRU(page);
- list_del(&page->lru);
- if (PageActive(page))
- add_page_to_active_list(zone, page);
- else
- add_page_to_inactive_list(zone, page);
- if (!pagevec_add(&pvec, page)) {
- spin_unlock_irq(&zone->lru_lock);
- __pagevec_release(&pvec);
- spin_lock_irq(&zone->lru_lock);
- }
- }
+ if (!nr_taken)
+ break;
} while (nr_scanned < max_scan);
- spin_unlock(&zone->lru_lock);
-done:
- local_irq_enable();
- pagevec_release(&pvec);
return nr_reclaimed;
}
--
-
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