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authorChristoph Lameter <clameter@sgi.com>2006-01-08 04:00:52 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 23:12:42 -0500
commit8419c3181086c86664e8246bc997afc2e4ffba4f (patch)
tree25938e6f99bdaaffe8f6d357582eca56692b091c /mm/vmscan.c
parent39743889aaf76725152f16aa90ca3c45f6d52da3 (diff)
[PATCH] SwapMig: CONFIG_MIGRATION fixes
Move move_to_lru, putback_lru_pages and isolate_lru in section surrounded by CONFIG_MIGRATION saving some codesize for single processor kernels. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c152
1 files changed, 76 insertions, 76 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 58270aea669a..daed4a73b761 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -569,6 +569,40 @@ keep:
569} 569}
570 570
571#ifdef CONFIG_MIGRATION 571#ifdef CONFIG_MIGRATION
572static inline void move_to_lru(struct page *page)
573{
574 list_del(&page->lru);
575 if (PageActive(page)) {
576 /*
577 * lru_cache_add_active checks that
578 * the PG_active bit is off.
579 */
580 ClearPageActive(page);
581 lru_cache_add_active(page);
582 } else {
583 lru_cache_add(page);
584 }
585 put_page(page);
586}
587
588/*
589 * Add isolated pages on the list back to the LRU
590 *
591 * returns the number of pages put back.
592 */
593int putback_lru_pages(struct list_head *l)
594{
595 struct page *page;
596 struct page *page2;
597 int count = 0;
598
599 list_for_each_entry_safe(page, page2, l, lru) {
600 move_to_lru(page);
601 count++;
602 }
603 return count;
604}
605
572/* 606/*
573 * swapout a single page 607 * swapout a single page
574 * page is locked upon entry, unlocked on exit 608 * page is locked upon entry, unlocked on exit
@@ -709,6 +743,48 @@ retry_later:
709 743
710 return nr_failed + retry; 744 return nr_failed + retry;
711} 745}
746
747static void lru_add_drain_per_cpu(void *dummy)
748{
749 lru_add_drain();
750}
751
752/*
753 * Isolate one page from the LRU lists and put it on the
754 * indicated list. Do necessary cache draining if the
755 * page is not on the LRU lists yet.
756 *
757 * Result:
758 * 0 = page not on LRU list
759 * 1 = page removed from LRU list and added to the specified list.
760 * -ENOENT = page is being freed elsewhere.
761 */
762int isolate_lru_page(struct page *page)
763{
764 int rc = 0;
765 struct zone *zone = page_zone(page);
766
767redo:
768 spin_lock_irq(&zone->lru_lock);
769 rc = __isolate_lru_page(page);
770 if (rc == 1) {
771 if (PageActive(page))
772 del_page_from_active_list(zone, page);
773 else
774 del_page_from_inactive_list(zone, page);
775 }
776 spin_unlock_irq(&zone->lru_lock);
777 if (rc == 0) {
778 /*
779 * Maybe this page is still waiting for a cpu to drain it
780 * from one of the lru lists?
781 */
782 rc = schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
783 if (rc == 0 && PageLRU(page))
784 goto redo;
785 }
786 return rc;
787}
712#endif 788#endif
713 789
714/* 790/*
@@ -758,48 +834,6 @@ static int isolate_lru_pages(int nr_to_scan, struct list_head *src,
758 return nr_taken; 834 return nr_taken;
759} 835}
760 836
761static void lru_add_drain_per_cpu(void *dummy)
762{
763 lru_add_drain();
764}
765
766/*
767 * Isolate one page from the LRU lists and put it on the
768 * indicated list. Do necessary cache draining if the
769 * page is not on the LRU lists yet.
770 *
771 * Result:
772 * 0 = page not on LRU list
773 * 1 = page removed from LRU list and added to the specified list.
774 * -ENOENT = page is being freed elsewhere.
775 */
776int isolate_lru_page(struct page *page)
777{
778 int rc = 0;
779 struct zone *zone = page_zone(page);
780
781redo:
782 spin_lock_irq(&zone->lru_lock);
783 rc = __isolate_lru_page(page);
784 if (rc == 1) {
785 if (PageActive(page))
786 del_page_from_active_list(zone, page);
787 else
788 del_page_from_inactive_list(zone, page);
789 }
790 spin_unlock_irq(&zone->lru_lock);
791 if (rc == 0) {
792 /*
793 * Maybe this page is still waiting for a cpu to drain it
794 * from one of the lru lists?
795 */
796 rc = schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
797 if (rc == 0 && PageLRU(page))
798 goto redo;
799 }
800 return rc;
801}
802
803/* 837/*
804 * shrink_cache() adds the number of pages reclaimed to sc->nr_reclaimed 838 * shrink_cache() adds the number of pages reclaimed to sc->nr_reclaimed
805 */ 839 */
@@ -865,40 +899,6 @@ done:
865 pagevec_release(&pvec); 899 pagevec_release(&pvec);
866} 900}
867 901
868static inline void move_to_lru(struct page *page)
869{
870 list_del(&page->lru);
871 if (PageActive(page)) {
872 /*
873 * lru_cache_add_active checks that
874 * the PG_active bit is off.
875 */
876 ClearPageActive(page);
877 lru_cache_add_active(page);
878 } else {
879 lru_cache_add(page);
880 }
881 put_page(page);
882}
883
884/*
885 * Add isolated pages on the list back to the LRU
886 *
887 * returns the number of pages put back.
888 */
889int putback_lru_pages(struct list_head *l)
890{
891 struct page *page;
892 struct page *page2;
893 int count = 0;
894
895 list_for_each_entry_safe(page, page2, l, lru) {
896 move_to_lru(page);
897 count++;
898 }
899 return count;
900}
901
902/* 902/*
903 * This moves pages from the active list to the inactive list. 903 * This moves pages from the active list to the inactive list.
904 * 904 *