The PATCH "mm: introduce compaction and migration for virtio ballooned pages" hacks around putback_lru_pages() in order to allow ballooned pages to be re-inserted on balloon page list as if a ballooned page was like a LRU page. As ballooned pages are not legitimate LRU pages, this patch introduces putback_movable_pages() to properly cope with cases where the isolated pageset contains ballooned pages and LRU pages, thus fixing the mentioned inelegant hack around putback_lru_pages(). Signed-off-by: Rafael Aquini <aquini@xxxxxxxxxx> --- include/linux/migrate.h | 2 ++ mm/compaction.c | 4 ++-- mm/migrate.c | 20 ++++++++++++++++++++ mm/page_alloc.c | 2 +- 4 files changed, 25 insertions(+), 3 deletions(-) diff --git a/include/linux/migrate.h b/include/linux/migrate.h index ce7e667..ff103a1 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -10,6 +10,7 @@ typedef struct page *new_page_t(struct page *, unsigned long private, int **); #ifdef CONFIG_MIGRATION extern void putback_lru_pages(struct list_head *l); +extern void putback_movable_pages(struct list_head *l); extern int migrate_page(struct address_space *, struct page *, struct page *, enum migrate_mode); extern int migrate_pages(struct list_head *l, new_page_t x, @@ -33,6 +34,7 @@ extern int migrate_huge_page_move_mapping(struct address_space *mapping, #else static inline void putback_lru_pages(struct list_head *l) {} +static inline void putback_movable_pages(struct list_head *l) {} static inline int migrate_pages(struct list_head *l, new_page_t x, unsigned long private, bool offlining, enum migrate_mode mode) { return -ENOSYS; } diff --git a/mm/compaction.c b/mm/compaction.c index e4e871b..8567bb8 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -837,9 +837,9 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) trace_mm_compaction_migratepages(nr_migrate - nr_remaining, nr_remaining); - /* Release LRU pages not migrated */ + /* Release isolated pages not migrated */ if (err) { - putback_lru_pages(&cc->migratepages); + putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; if (err == -ENOMEM) { ret = COMPACT_PARTIAL; diff --git a/mm/migrate.c b/mm/migrate.c index 80f22bb..1165134 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -79,6 +79,26 @@ void putback_lru_pages(struct list_head *l) list_del(&page->lru); dec_zone_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); + putback_lru_page(page); + } +} + +/* + * Put previously isolated pages back onto the appropriated lists + * from where they were once taken off for compaction/migration. + * + * This function shall be used instead of putback_lru_pages(), + * whenever the isolated pageset has been built by isolate_migratepages_range() + */ +void putback_movable_pages(struct list_head *l) +{ + struct page *page; + struct page *page2; + + list_for_each_entry_safe(page, page2, l, lru) { + list_del(&page->lru); + dec_zone_page_state(page, NR_ISOLATED_ANON + + page_is_file_cache(page)); if (unlikely(movable_balloon_page(page))) putback_balloon_page(page); else diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 009ac28..78b7663 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5669,7 +5669,7 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end) 0, false, MIGRATE_SYNC); } - putback_lru_pages(&cc.migratepages); + putback_movable_pages(&cc.migratepages); return ret > 0 ? 0 : ret; } -- 1.7.11.2 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx"> email@xxxxxxxxx </a>