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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>
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@ -257,11 +257,13 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
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struct sysinfo i;
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unsigned int idx = 0;
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long available;
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unsigned long caches;
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all_vm_events(events);
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si_meminfo(&i);
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available = si_mem_available();
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caches = global_node_page_state(NR_FILE_PAGES);
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#ifdef CONFIG_VM_EVENT_COUNTERS
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update_stat(vb, idx++, VIRTIO_BALLOON_S_SWAP_IN,
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@ -277,6 +279,8 @@ static unsigned int update_balloon_stats(struct virtio_balloon *vb)
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pages_to_bytes(i.totalram));
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update_stat(vb, idx++, VIRTIO_BALLOON_S_AVAIL,
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pages_to_bytes(available));
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update_stat(vb, idx++, VIRTIO_BALLOON_S_CACHES,
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pages_to_bytes(caches));
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return idx;
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}
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@ -52,7 +52,8 @@ struct virtio_balloon_config {
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#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
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#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
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#define VIRTIO_BALLOON_S_AVAIL 6 /* Available memory as in /proc */
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#define VIRTIO_BALLOON_S_NR 7
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#define VIRTIO_BALLOON_S_CACHES 7 /* Disk caches */
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#define VIRTIO_BALLOON_S_NR 8
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/*
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* Memory statistics structure.
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