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>
---
include/linux/balloon_compaction.h | 7 +++++++
include/linux/vm_event_item.h | 7 ++++++-
mm/balloon_compaction.c | 2 ++
mm/migrate.c | 1 +
mm/vmstat.c | 9 ++++++++-
5 files changed, 24 insertions(+), 2 deletions(-)
diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h
index 2e63d94..68893bc 100644
--- a/include/linux/balloon_compaction.h
+++ b/include/linux/balloon_compaction.h
@@ -197,8 +197,15 @@ static inline bool balloon_compaction_check(void)
return true;
}
+static inline void balloon_event_count(enum vm_event_item item)
+{
+ count_vm_event(item);
+}
#else /* !CONFIG_BALLOON_COMPACTION */
+/* A macro, to avoid generating references to the undefined COMPACTBALLOON* */
+#define balloon_event_count(item) do { } while (0)
+
static inline void *balloon_mapping_alloc(void *balloon_device,
const struct address_space_operations *a_ops)
{
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index 3d31145..bd67c3f 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h
@@ -41,7 +41,12 @@ 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 */
+#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 07dbc8e..2c8ce49 100644
--- a/mm/balloon_compaction.c
+++ b/mm/balloon_compaction.c
@@ -242,6 +242,7 @@ 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;
}
@@ -265,6 +266,7 @@ void balloon_page_putback(struct page *page)
__putback_balloon_page(page);
/* drop the extra ref count taken for page isolation */
put_page(page);
+ balloon_event_count(COMPACTBALLOONRETURNED);
} else {
WARN_ON(1);
dump_page(page);
diff --git a/mm/migrate.c b/mm/migrate.c
index 107a281..ecae213 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -894,6 +894,7 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
dec_zone_page_state(page, NR_ISOLATED_ANON +
page_is_file_cache(page));
balloon_page_free(page);
+ balloon_event_count(COMPACTBALLOONMIGRATED);
return MIGRATEPAGE_SUCCESS;
}
out:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index c737057..18a76ea 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -781,7 +781,14 @@ 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",
+#endif /* CONFIG_BALLOON_COMPACTION */
+
+#endif /* CONFIG_COMPACTION */
#ifdef CONFIG_HUGETLB_PAGE
"htlb_buddy_alloc_success",
--
1.7.11.7
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