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 | 2 ++
include/linux/vm_event_item.h | 8 +++++++-
mm/balloon_compaction.c | 6 ++++--
mm/migrate.c | 1 +
mm/vmstat.c | 10 +++++++++-
5 files changed, 23 insertions(+), 4 deletions(-)
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index bda7bb0..c358ed3 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -449,6 +449,8 @@ int virtballoon_migratepage(struct address_space *mapping,
set_page_pfns(vb->pfns, page);
tell_host(vb, vb->deflate_vq);
+ /* perform vm accountability on this successful page migration */
+ count_balloon_event(COMPACTBALLOONMIGRATED);
mutex_unlock(&vb->balloon_lock);
return 0;
}
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 57f7b10..6868aba 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 */
+ COMPACTBALLOONRETURNED, /* putback to pagelist, not-migrated */
+ COMPACTBALLOONRELEASED, /* old-page released after migration */
+#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 d79f13d..9186000 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -114,6 +114,7 @@ bool isolate_balloon_page(struct page *page)
(page_count(page) == 2)) {
if (__isolate_balloon_page(page)) {
unlock_page(page);
+ count_vm_event(COMPACTBALLOONISOLATED);
return true;
}
}
@@ -137,9 +138,10 @@ void putback_balloon_page(struct page *page)
* concurrent isolation threads attempting to re-isolate it.
*/
lock_page(page);
- if (movable_balloon_page(page))
+ if (movable_balloon_page(page)) {
__putback_balloon_page(page);
-
+ count_vm_event(COMPACTBALLOONRETURNED);
+ }
unlock_page(page);
}
#endif /* CONFIG_BALLOON_COMPACTION */
diff --git a/mm/migrate.c b/mm/migrate.c
index 0bf2caf..052e59a 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -893,6 +893,7 @@ 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_balloon_event(COMPACTBALLOONRELEASED);
return rc;
}
out:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index df7a674..c7919c4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -768,7 +768,15 @@ const char * const vmstat_text[] = {
"compact_stall",
"compact_fail",
"compact_success",
-#endif
+
+#ifdef CONFIG_BALLOON_COMPACTION
+ "compact_balloon_isolated",
+ "compact_balloon_migrated",
+ "compact_balloon_returned",
+ "compact_balloon_released",
+#endif /* CONFIG_BALLOON_COMPACTION */
+
+#endif /* CONFIG_COMPACTION */
#ifdef CONFIG_HUGETLB_PAGE
"htlb_buddy_alloc_success",
--
1.7.11.4
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