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virtio_balloon: include disk/file caches memory statistics 

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@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Tomáš Golembiovský 2017-11-12 13:05:38 +01:00 committed by Michael S. Tsirkin
parent d8a5b80568
commit 4d32029b8d
2 changed files with 6 additions and 1 deletions
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4
drivers/virtio/virtio_balloon.c
View File

@ -257,11 +257,13 @@ 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,
@ -277,6 +279,8 @@ 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;
}

3
include/uapi/linux/virtio_balloon.h
View File

@ -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.