Commit 4d32029b authored by Tomáš Golembiovský's avatar Tomáš Golembiovský Committed by Michael S. Tsirkin
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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: default avatarTomáš Golembiovský <tgolembi@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent d8a5b805

drivers/virtio/virtio_balloon.c

+4 −0
Original line number Diff line number Diff line
@@ -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;

}

include/uapi/linux/virtio_balloon.h

+2 −1
Original line number Diff line number Diff line
@@ -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.

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