[PATCH v11 7/7] mm: add vm event counters for balloon pages compaction

[Rafael Aquini <aquini@redhat.com>]

This patch introduces a new set of vm event counters to keep track of
ballooned pages compaction activity.

Signed-off-by: Rafael Aquini <aquini@redhat.com>
---
 drivers/virtio/virtio_balloon.c |  1 +
 include/linux/vm_event_item.h   |  8 +++++++-
 mm/balloon_compaction.c         |  2 ++
 mm/migrate.c                    |  1 +
 mm/vmstat.c                     | 10 +++++++++-
 5 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 69eede7..3756fc1 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -411,6 +411,7 @@ int virtballoon_migratepage(struct address_space *mapping,
 	tell_host(vb, vb->deflate_vq);
 
 	mutex_unlock(&vb->balloon_lock);
+	balloon_event_count(COMPACTBALLOONMIGRATED);
 
 	return MIGRATEPAGE_BALLOON_SUCCESS;
 }
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 3d31145..cbd72fc 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -41,7 +41,13 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 #ifdef CONFIG_COMPACTION
 		COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,
 		COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
-#endif
+#ifdef CONFIG_BALLOON_COMPACTION
+		COMPACTBALLOONISOLATED, /* isolated from balloon pagelist */
+		COMPACTBALLOONMIGRATED, /* balloon page sucessfully migrated */
+		COMPACTBALLOONRELEASED, /* old-page released after migration */
+		COMPACTBALLOONRETURNED, /* putback to pagelist, not-migrated */
+#endif /* CONFIG_BALLOON_COMPACTION */
+#endif /* CONFIG_COMPACTION */
 #ifdef CONFIG_HUGETLB_PAGE
 		HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
 #endif
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c
index 90935aa..32927eb 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -215,6 +215,7 @@ bool balloon_page_isolate(struct page *page)
 			if (__is_movable_balloon_page(page) &&
 			    page_count(page) == 2) {
 				__isolate_balloon_page(page);
+				balloon_event_count(COMPACTBALLOONISOLATED);
 				unlock_page(page);
 				return true;
 			}
@@ -237,6 +238,7 @@ void balloon_page_putback(struct page *page)
 	if (__is_movable_balloon_page(page)) {
 		__putback_balloon_page(page);
 		put_page(page);
+		balloon_event_count(COMPACTBALLOONRETURNED);
 	} else {
 		__WARN();
 		dump_page(page);
diff --git a/mm/migrate.c b/mm/migrate.c
index adb3d44..ee3037d 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -896,6 +896,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
 				    page_is_file_cache(page));
 		put_page(page);
 		__free_page(page);
+		balloon_event_count(COMPACTBALLOONRELEASED);
 		return 0;
 	}
 out:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..1363edc 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -781,7 +781,15 @@ const char * const vmstat_text[] = {
 	"compact_stall",
 	"compact_fail",
 	"compact_success",
-#endif
+
+#ifdef CONFIG_BALLOON_COMPACTION
+	"compact_balloon_isolated",
+	"compact_balloon_migrated",
+	"compact_balloon_released",
+	"compact_balloon_returned",
+#endif /* CONFIG_BALLOON_COMPACTION */
+
+#endif /* CONFIG_COMPACTION */
 
 #ifdef CONFIG_HUGETLB_PAGE
 	"htlb_buddy_alloc_success",
-- 
1.7.11.7

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