linux-kernel - [PATCH 4/4] mm: add vm event counters for balloon pages compaction

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Message-Id: <da3d24a93ea248a7bbe107846385428b0cf6f8a6.1340665087.git.aquini@redhat.com>
Date:	Mon, 25 Jun 2012 20:25:59 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Rafael Aquini <aquini@...hat.com>
Subject: [PATCH 4/4] mm: add vm event counters for balloon pages compaction

This patch is only for testing report purposes and shall be dropped in case of
the rest of this patchset getting accepted for merging.

Signed-off-by: Rafael Aquini <aquini@...hat.com>
---
 drivers/virtio/virtio_balloon.c |    1 +
 include/linux/vm_event_item.h   |    2 ++
 mm/compaction.c                 |    4 +++-
 mm/migrate.c                    |    6 ++++--
 mm/vmstat.c                     |    4 ++++
 5 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 53386aa..c4a929d 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -406,6 +406,7 @@ int virtballoon_migratepage(struct address_space *mapping,
 	spin_unlock(&vb->pfn_list_lock);
 	tell_host(vb, vb->deflate_vq, &sg);
 
+	count_vm_event(COMPACTBALLOONMIGRATED);
 	return 0;
 }
 
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 06f8e38..e330c5a 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -40,6 +40,8 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT,
 #ifdef CONFIG_COMPACTION
 		COMPACTBLOCKS, COMPACTPAGES, COMPACTPAGEFAILED,
 		COMPACTSTALL, COMPACTFAIL, COMPACTSUCCESS,
+		COMPACTBALLOONMIGRATED, COMPACTBALLOONFAILED,
+		COMPACTBALLOONISOLATED, COMPACTBALLOONFREED,
 #endif
 #ifdef CONFIG_HUGETLB_PAGE
 		HTLB_BUDDY_PGALLOC, HTLB_BUDDY_PGALLOC_FAIL,
diff --git a/mm/compaction.c b/mm/compaction.c
index 8835d55..cf250b8 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -318,8 +318,10 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc,
 		 * for PageLRU, as well as skip the LRU page isolation steps.
 		 */
 		if (PageBalloon(page))
-			if (isolate_balloon_page(page))
+			if (isolate_balloon_page(page)) {
+				count_vm_event(COMPACTBALLOONISOLATED);
 				goto isolated_balloon_page;
+		}
 
 		if (!PageLRU(page))
 			continue;
diff --git a/mm/migrate.c b/mm/migrate.c
index ffc02a4..3dbca33 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -78,9 +78,10 @@ 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));
-		if (unlikely(PageBalloon(page)))
+		if (unlikely(PageBalloon(page))) {
 			VM_BUG_ON(!putback_balloon_page(page));
-		else
+			count_vm_event(COMPACTBALLOONFAILED);
+		} else
 			putback_lru_page(page);
 	}
 }
@@ -878,6 +879,7 @@ 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);
+		count_vm_event(COMPACTBALLOONFREED);
 		return rc;
 	}
 out:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 1bbbbd9..3b7109f 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -767,6 +767,10 @@ const char * const vmstat_text[] = {
 	"compact_stall",
 	"compact_fail",
 	"compact_success",
+	"compact_balloon_migrated",
+	"compact_balloon_failed",
+	"compact_balloon_isolated",
+	"compact_balloon_freed",
 #endif
 
 #ifdef CONFIG_HUGETLB_PAGE
-- 
1.7.10.2

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