[PATCH 2/3] virtio_balloon: introduce memory allocation stall counter

[zhenwei pi <pizhenwei@bytedance.com>]

Memory allocation stall counter represents the performance/latency of
memory allocation, expose this counter to the host side by virtio
balloon device via out-of-bound way.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
 drivers/virtio/virtio_balloon.c     | 20 +++++++++++++++++++-
 include/uapi/linux/virtio_balloon.h |  6 ++++--
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index fd19934a847f..e88e6573afa5 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -321,7 +321,7 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
 	unsigned long events[NR_VM_EVENT_ITEMS];
 	struct sysinfo i;
 	unsigned int idx = 0;
-	long available;
+	long available, stall = 0;
 	unsigned long caches;
 
 	all_vm_events(events);
@@ -338,6 +338,24 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
 	update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]);
 	update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]);
 	update_stat(vb, idx++, VIRTIO_BALLOON_S_OOM_KILL, events[OOM_KILL]);
+
+	/* sum all the stall events */
+#ifdef CONFIG_ZONE_DMA
+	stall += events[ALLOCSTALL_DMA];
+#endif
+#ifdef CONFIG_ZONE_DMA32
+	stall += events[ALLOCSTALL_DMA32];
+#endif
+#ifdef CONFIG_HIGHMEM
+	stall += events[ALLOCSTALL_HIGH];
+#endif
+#ifdef CONFIG_ZONE_DEVICE
+	stall += events[ALLOCSTALL_DEVICE];
+#endif
+	stall += events[ALLOCSTALL_NORMAL];
+	stall += events[ALLOCSTALL_MOVABLE];
+	update_stat(vb, idx++, VIRTIO_BALLOON_S_ALLOC_STALL, stall);
+
 #ifdef CONFIG_HUGETLB_PAGE
 	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
 		    events[HTLB_BUDDY_PGALLOC]);
diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index b17bbe033697..487b893a160e 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h
@@ -72,7 +72,8 @@ struct virtio_balloon_config {
 #define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page allocations */
 #define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation failures */
 #define VIRTIO_BALLOON_S_OOM_KILL      10 /* OOM killer invocations */
-#define VIRTIO_BALLOON_S_NR       11
+#define VIRTIO_BALLOON_S_ALLOC_STALL   11 /* Stall count of memory allocatoin */
+#define VIRTIO_BALLOON_S_NR       12
 
 #define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
 	VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
@@ -85,7 +86,8 @@ struct virtio_balloon_config {
 	VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
 	VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
 	VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures", \
-	VIRTIO_BALLOON_S_NAMES_prefix "oom-kills" \
+	VIRTIO_BALLOON_S_NAMES_prefix "oom-kills", \
+	VIRTIO_BALLOON_S_NAMES_prefix "alloc-stalls" \
 }
 
 #define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
-- 
2.34.1