[RFCv2 4/5] mm/compaction: compaction calls generic migration

[Gioh Kim]

Compaction calls interfaces of driver page migration
instead of calling balloon migration directly.

Signed-off-by: Gioh Kim <gioh.kim@xxxxxxx>
---
 drivers/virtio/virtio_balloon.c |  1 +
 mm/compaction.c                 |  9 +++++----
 mm/migrate.c                    | 21 ++++++++++++---------
 3 files changed, 18 insertions(+), 13 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index c49b553..5e5cbea 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -30,6 +30,7 @@
 #include <linux/balloon_compaction.h>
 #include <linux/oom.h>
 #include <linux/wait.h>
+#include <linux/anon_inodes.h>
 
 /*
  * Balloon device works in 4K page units.  So each page is pointed to by
diff --git a/mm/compaction.c b/mm/compaction.c
index 16e1b57..cc5ec81 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -14,7 +14,7 @@
 #include <linux/backing-dev.h>
 #include <linux/sysctl.h>
 #include <linux/sysfs.h>
-#include <linux/balloon_compaction.h>
+#include <linux/compaction.h>
 #include <linux/page-isolation.h>
 #include <linux/kasan.h>
 #include "internal.h"
@@ -714,12 +714,13 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 
 		/*
 		 * Check may be lockless but that's ok as we recheck later.
-		 * It's possible to migrate LRU pages and balloon pages
+		 * It's possible to migrate LRU pages and driver pages
 		 * Skip any other type of page
 		 */
 		if (!PageLRU(page)) {
-			if (unlikely(balloon_page_movable(page))) {
-				if (balloon_page_isolate(page)) {
+			if (unlikely(driver_page_migratable(page))) {
+				if (page->mapping->a_ops->isolatepage(page,
+								isolate_mode)) {
 					/* Successfully isolated */
 					goto isolate_success;
 				}
diff --git a/mm/migrate.c b/mm/migrate.c
index 236ee25..a0bc1e4 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -35,7 +35,7 @@
 #include <linux/hugetlb.h>
 #include <linux/hugetlb_cgroup.h>
 #include <linux/gfp.h>
-#include <linux/balloon_compaction.h>
+#include <linux/compaction.h>
 #include <linux/mmu_notifier.h>
 
 #include <asm/tlbflush.h>
@@ -76,7 +76,7 @@ int migrate_prep_local(void)
  * from where they were once taken off for compaction/migration.
  *
  * This function shall be used whenever the isolated pageset has been
- * built from lru, balloon, hugetlbfs page. See isolate_migratepages_range()
+ * built from lru, driver, hugetlbfs page. See isolate_migratepages_range()
  * and isolate_huge_page().
  */
 void putback_movable_pages(struct list_head *l)
@@ -92,8 +92,8 @@ void putback_movable_pages(struct list_head *l)
 		list_del(&page->lru);
 		dec_zone_page_state(page, NR_ISOLATED_ANON +
 				page_is_file_cache(page));
-		if (unlikely(isolated_balloon_page(page)))
-			balloon_page_putback(page);
+		if (unlikely(driver_page_migratable(page)))
+			page->mapping->a_ops->putbackpage(page);
 		else
 			putback_lru_page(page);
 	}
@@ -844,15 +844,18 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
 		}
 	}
 
-	if (unlikely(isolated_balloon_page(page))) {
+	if (unlikely(driver_page_migratable(page))) {
 		/*
-		 * A ballooned page does not need any special attention from
+		 * A driver 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);
+		rc = page->mapping->a_ops->migratepage(page->mapping,
+						       newpage,
+						       page,
+						       mode);
 		goto out_unlock;
 	}
 
@@ -962,8 +965,8 @@ out:
 	if (rc != MIGRATEPAGE_SUCCESS && put_new_page) {
 		ClearPageSwapBacked(newpage);
 		put_new_page(newpage, private);
-	} else if (unlikely(__is_movable_balloon_page(newpage))) {
-		/* drop our reference, page already in the balloon */
+	} else if (unlikely(driver_page_migratable(newpage))) {
+		/* drop our reference */
 		put_page(newpage);
 	} else
 		putback_lru_page(newpage);
-- 
1.9.1

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