On 2018年03月20日 12:26, Jonathan Helman wrote:
On Mar 19, 2018, at 7:31 PM, Jason Wang <jasowang@xxxxxxxxxx> 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
HTLB_BUDDY_PGALLOC_FAIL.
Signed-off-by: Jonathan Helman <jonathan.helman@xxxxxxxxxx>
Reviewed-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks.
---
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..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?
Jon
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.
Thanks
Thanks
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