On 02/27/2018 07:20 AM, Michael S. Tsirkin wrote:

On Fri, Feb 16, 2018 at 09:44:32PM -0800, Jonathan Helman wrote:

quoted

Export statistics for successful and failed huge page allocations
from the virtio balloon driver. These 2 stats come directly from
the vm_events HTLB_BUDDY_PGALLOC and HTLB_BUDDY_PGALLOC_FAIL.
Signed-off-by: Jonathan Helman <redacted>

Any host/guest intergace changes need to be copied to
the virtio TC mailing list (subscriber-only, sorry about that):
virtio-dev@lists.oasis-open.org

Sorry, will do on v2.

quoted

---
  drivers/virtio/virtio_balloon.c     | 6 ++++++
  include/uapi/linux/virtio_balloon.h | 4 +++-
  2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index dfe5684..6b237e3 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c

@@ -272,6 +272,12 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
  				pages_to_bytes(events[PSWPOUT]));
  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MAJFLT, events[PGMAJFAULT]);
  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MINFLT, events[PGFAULT]);
+#ifdef CONFIG_HUGETLB_PAGE
+	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGALLOC,
+		    events[HTLB_BUDDY_PGALLOC]);
+	update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL,
+		    events[HTLB_BUDDY_PGALLOC_FAIL]);
+#endif
  #endif
  	update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE,
  				pages_to_bytes(i.freeram));

diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 4e8b830..e3e8071 100644
--- a/include/uapi/linux/virtio_balloon.h
+++ b/include/uapi/linux/virtio_balloon.h

@@ -53,7 +53,9 @@ struct virtio_balloon_config {
  #define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
  #define VIRTIO_BALLOON_S_AVAIL    6   /* Available memory as in /proc */
  #define VIRTIO_BALLOON_S_CACHES   7   /* Disk caches */
-#define VIRTIO_BALLOON_S_NR       8
+#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Number of htlb pgalloc successes */
+#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Number of htlb pgalloc failures */
+#define VIRTIO_BALLOON_S_NR       10

Can you clarify the comments pls? Eschew abbreviation.

Sure. How about the following instead? Hoping it makes things clearer, 
without going over the 80 character limit ;)

#define VIRTIO_BALLOON_S_HTLB_PGALLOC  8  /* Hugetlb page allocations */
#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation 
failures */

If this is better, I'll send out a v2.

Thanks,
Jon

quoted

  
  /*
   * Memory statistics structure.
-- 
1.8.3.1