diff options
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 33f5f82a6006..427343c0c296 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -35,6 +35,7 @@ #include <linux/hugetlb.h> #include <linux/hugetlb_cgroup.h> #include <linux/gfp.h> +#include <linux/balloon_compaction.h> #include <asm/tlbflush.h> @@ -79,7 +80,10 @@ 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); + if (unlikely(balloon_page_movable(page))) + balloon_page_putback(page); + else + putback_lru_page(page); } } @@ -768,6 +772,18 @@ static int __unmap_and_move(struct page *page, struct page *newpage, } } + if (unlikely(balloon_page_movable(page))) { + /* + * A ballooned page does not need any special attention from + * physical to virtual reverse mapping procedures. + * Skip any attempt to unmap PTEs or to remap swap cache, + * in order to avoid burning cycles at rmap level, and perform + * the page migration right away (proteced by page lock). + */ + rc = balloon_page_migrate(newpage, page, mode); + goto uncharge; + } + /* * Corner case handling: * 1. When a new swap-cache page is read into, it is added to the LRU @@ -804,7 +820,9 @@ skip_unmap: put_anon_vma(anon_vma); uncharge: - mem_cgroup_end_migration(mem, page, newpage, rc == MIGRATEPAGE_SUCCESS); + mem_cgroup_end_migration(mem, page, newpage, + (rc == MIGRATEPAGE_SUCCESS || + rc == MIGRATEPAGE_BALLOON_SUCCESS)); unlock: unlock_page(page); out: @@ -836,6 +854,18 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private, goto out; rc = __unmap_and_move(page, newpage, force, offlining, mode); + + if (unlikely(rc == MIGRATEPAGE_BALLOON_SUCCESS)) { + /* + * A ballooned page has been migrated already. + * Now, it's the time to wrap-up counters, + * handle the page back to Buddy and return. + */ + dec_zone_page_state(page, NR_ISOLATED_ANON + + page_is_file_cache(page)); + balloon_page_free(page); + return MIGRATEPAGE_SUCCESS; + } out: if (rc != -EAGAIN) { /* |