linux-kernel - [PATCH v3 4/4] mm: add vm event counters for balloon pages compaction

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Message-Id: <6145b865655933ffdcb8f1e7c9732539ee098bf2.1341353014.git.aquini@redhat.com>
Date:	Tue,  3 Jul 2012 20:48:52 -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>, Mel Gorman <mel@....ul.ie>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Minchan Kim <minchan@...nel.org>,
	Rafael Aquini <aquini@...hat.com>
Subject: [PATCH v3 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                 |    1 +
 mm/migrate.c                    |    6 ++++--
 mm/vmstat.c                     |    4 ++++
 5 files changed, 12 insertions(+), 2 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 887d0fc..8f7df01 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -72,6 +72,7 @@ static bool isolate_balloon_page(struct page *page)
 			if (is_balloon_page(page) && (page_count(page) == 2)) {
 				__isolate_balloon_page(page);
 				unlock_page(page);
+				count_vm_event(COMPACTBALLOONISOLATED);
 				return true;
 			}
 			unlock_page(page);
diff --git a/mm/migrate.c b/mm/migrate.c
index 59c7bc5..5838719 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(is_balloon_page(page)))
+		if (unlikely(is_balloon_page(page))) {
+			count_vm_event(COMPACTBALLOONFAILED);
 			WARN_ON(!putback_balloon_page(page));
-		else
+		} 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
-- 
1.7.10.4

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