On Sun, Nov 12, 2017 at 01:05:38PM +0100, Tomáš Golembiovský wrote:
> Add a new field VIRTIO_BALLOON_S_CACHES to virtio_balloon memory
> statistics protocol. The value represents all disk/file caches.
>
> In this case it corresponds to the sum of values
> Buffers+Cached+SwapCached from /proc/meminfo.
>
> Signed-off-by: Tomáš Golembiovský <tgolembi@xxxxxxxxxx>
I parked this on vhost branch, part of linux next.
> ---
> drivers/virtio/virtio_balloon.c | 4 ++++
> include/uapi/linux/virtio_balloon.h | 3 ++-
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index f0b3a0b9d42f..d2bd13bbaf9f 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -244,11 +244,13 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
> struct sysinfo i;
> unsigned int idx = 0;
> long available;
> + unsigned long caches;
>
> all_vm_events(events);
> si_meminfo(&i);
>
> available = si_mem_available();
> + caches = global_node_page_state(NR_FILE_PAGES);
>
> #ifdef CONFIG_VM_EVENT_COUNTERS
> update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN,
> @@ -264,6 +266,8 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
> pages_to_bytes(i.totalram));
> update_stat(vb, idx++, VIRTIO_BALLOON_S_AVAIL,
> pages_to_bytes(available));
> + update_stat(vb, idx++, VIRTIO_BALLOON_S_CACHES,
> + pages_to_bytes(caches));
>
> return idx;
> }
> diff --git a/include/uapi/linux/virtio_balloon.h b/include/uapi/linux/virtio_balloon.h
> index 343d7ddefe04..4e8b8304b793 100644
> --- a/include/uapi/linux/virtio_balloon.h
> +++ b/include/uapi/linux/virtio_balloon.h
> @@ -52,7 +52,8 @@ struct virtio_balloon_config {
> #define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
> #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_NR 7
> +#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
> +#define VIRTIO_BALLOON_S_NR 8
>
> /*
> * Memory statistics structure.
> --
> 2.15.0
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