This patch introduces a new set of vm event counters to keep track of
ballooned pages compaction activity.
Signed-off-by: Rafael Aquini <aquini@xxxxxxxxxx>
---
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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