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Subject: Re: [virtio-dev] Re: [PATCH v2] virtio_balloon: export hugetlb page allocation counts

On 03/22/2018 07:38 PM, Jason Wang wrote:

On 2018年03月22日 11:10, Michael S. Tsirkin wrote:
On Thu, Mar 22, 2018 at 09:52:18AM +0800, Jason Wang wrote:
On 2018年03月20日 12:26, Jonathan Helman wrote:
On Mar 19, 2018, at 7:31 PM, Jason Wang<jasowang@redhat.com>  wrote:

On 2018年03月20日 06:14, Jonathan Helman wrote:
Export the number of successful and failed hugetlb page
allocations via the virtio balloon driver. These 2 counts
come directly from the vm_events HTLB_BUDDY_PGALLOC and

Signed-off-by: Jonathan Helman<jonathan.helman@oracle.com>
Reviewed-by: Jason Wang<jasowang@redhat.com>

   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)
       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_HTLB_PGALLOC,
+            events[HTLB_BUDDY_PGALLOC]);
+    update_stat(vb, idx++, VIRTIO_BALLOON_S_HTLB_PGFAIL,
+            events[HTLB_BUDDY_PGALLOC_FAIL]);
       update_stat(vb, idx++, VIRTIO_BALLOON_S_MEMFREE,
diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
index 4e8b830..40297a3 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  /* Hugetlb page allocations */ +#define VIRTIO_BALLOON_S_HTLB_PGFAIL   9  /* Hugetlb page allocation failures */
+#define VIRTIO_BALLOON_S_NR       10
    * Memory statistics structure.
Not for this patch, but it looks to me that exporting such nr through uapi is fragile.
Sorry, can you explain what you mean here?

Spec said "Within an output buffer submitted to the statsq, the device MUST
ignore entries with tag values that it does not recognize". So exporting
VIRTIO_BALLOON_S_NR seems useless and device implementation can not depend
on such number in uapi.

Suggestions? I don't like to break build for people ...

Didn't have a good idea. But maybe we should keep VIRTIO_BALLOON_S_NR unchanged, and add a comment here.


I think Jason's comment is for a future patch. Didn't see this patch get applied, so wondering if it could be.


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