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virtio-balloon: add hugetlb page allocation counts

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qemu should read and report hugetlb page allocation
counts exported in the following kernel patch:

    commit 4c3ca37c4a4394978fd0f005625f6064ed2b9a64
    Author: Jonathan Helman <jonathan.helman@oracle.com>
    Date:   Mon Mar 19 11:00:35 2018 -0700

    virtio_balloon: export hugetlb page allocation counts

    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@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Jonathan Helman 2018-03-19 15:28:49 -07:00 committed by Michael S. Tsirkin
parent 50a6fa8f93
commit b7b1264429
3 changed files with 7 additions and 1 deletions
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2
docs/virtio-balloon-stats.txt
View File

@ -34,6 +34,8 @@ which will return a dictionary containing:
- stat-total-memory
- stat-available-memory
- stat-disk-caches
- stat-htlb-pgalloc
- stat-htlb-pgfail
o A key named last-update, which contains the last stats update
timestamp in seconds. Since this timestamp is generated by the host,

2
hw/virtio/virtio-balloon.c
View File

@ -52,6 +52,8 @@ static const char *balloon_stat_names[] = {
[VIRTIO_BALLOON_S_MEMTOT] = "stat-total-memory",
[VIRTIO_BALLOON_S_AVAIL] = "stat-available-memory",
[VIRTIO_BALLOON_S_CACHES] = "stat-disk-caches",
[VIRTIO_BALLOON_S_HTLB_PGALLOC] = "stat-htlb-pgalloc",
[VIRTIO_BALLOON_S_HTLB_PGFAIL] = "stat-htlb-pgfail",
[VIRTIO_BALLOON_S_NR] = NULL
};

4
include/standard-headers/linux/virtio_balloon.h
View File

@ -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.