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virtio_balloon: add array of stat names 

Jason Wang points out that it's very hard for users to build an array of
stat names. The naive thing is to use VIRTIO_BALLOON_S_NR but that
breaks if we add more stats - as done e.g. recently by commit 6c64fe7f2
("virtio_balloon: export hugetlb page allocation counts").

Let's add an array of reasonably readable names.

Fixes: 6c64fe7f2 ("virtio_balloon: export hugetlb page allocation counts")
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jonathan Helman <jonathan.helman@oracle.com>
This commit is contained in:
Michael S. Tsirkin 2018-04-13 16:37:04 +03:00
parent 6d08b06e67
commit b400003250
1 changed files with 15 additions and 0 deletions
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15
include/uapi/linux/virtio_balloon.h
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@ -57,6 +57,21 @@ struct virtio_balloon_config {
#define VIRTIO_BALLOON_S_HTLB_PGFAIL 9 /* Hugetlb page allocation failures */
#define VIRTIO_BALLOON_S_NR 10
#define VIRTIO_BALLOON_S_NAMES_WITH_PREFIX(VIRTIO_BALLOON_S_NAMES_prefix) { \
VIRTIO_BALLOON_S_NAMES_prefix "swap-in", \
VIRTIO_BALLOON_S_NAMES_prefix "swap-out", \
VIRTIO_BALLOON_S_NAMES_prefix "major-faults", \
VIRTIO_BALLOON_S_NAMES_prefix "minor-faults", \
VIRTIO_BALLOON_S_NAMES_prefix "free-memory", \
VIRTIO_BALLOON_S_NAMES_prefix "total-memory", \
VIRTIO_BALLOON_S_NAMES_prefix "available-memory", \
VIRTIO_BALLOON_S_NAMES_prefix "disk-caches", \
VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-allocations", \
VIRTIO_BALLOON_S_NAMES_prefix "hugetlb-failures" \
}
#define VIRTIO_BALLOON_S_NAMES VIRTIO_BALLOON_S_NAMES_WITH_PREFIX("")
/*
* Memory statistics structure.
* Driver fills an array of these structures and passes to device.