aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/virtio_balloon.h
diff options
context:
space:
mode:
authorAdam Litke <agl@us.ibm.com>2009-11-30 11:14:15 -0500
committerRusty Russell <rusty@rustcorp.com.au>2010-02-23 22:52:08 -0500
commit9564e138b1f6eb137f7149772438d3f3fb3277dd (patch)
tree2e53562c2b7ab7051d448b8f81766dc61ad524b5 /include/linux/virtio_balloon.h
parent1f08b833ddbdb1c8e81c4b1053c2ebb7b89cb437 (diff)
virtio: Add memory statistics reporting to the balloon driver (V4)
Changes since V3: - Do not do endian conversions as they will be done in the host - Report stats that reference a quantity of memory in bytes - Minor coding style updates Changes since V2: - Increase stat field size to 64 bits - Report all sizes in kb (not pages) - Drop anon_pages stat and fix endianness conversion Changes since V1: - Use a virtqueue instead of the device config space When using ballooning to manage overcommitted memory on a host, a system for guests to communicate their memory usage to the host can provide information that will minimize the impact of ballooning on the guests. The current method employs a daemon running in each guest that communicates memory statistics to a host daemon at a specified time interval. The host daemon aggregates this information and inflates and/or deflates balloons according to the level of host memory pressure. This approach is effective but overly complex since a daemon must be installed inside each guest and coordinated to communicate with the host. A simpler approach is to collect memory statistics in the virtio balloon driver and communicate them directly to the hypervisor. This patch enables the guest-side support by adding stats collection and reporting to the virtio balloon driver. Signed-off-by: Adam Litke <agl@us.ibm.com> Cc: Anthony Liguori <anthony@codemonkey.ws> Cc: virtualization@lists.linux-foundation.org Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (minor fixes)
Diffstat (limited to 'include/linux/virtio_balloon.h')
-rw-r--r--include/linux/virtio_balloon.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/virtio_balloon.h b/include/linux/virtio_balloon.h
index 1418f048cb34..a50ecd1b81a2 100644
--- a/include/linux/virtio_balloon.h
+++ b/include/linux/virtio_balloon.h
@@ -7,6 +7,7 @@
7 7
8/* The feature bitmap for virtio balloon */ 8/* The feature bitmap for virtio balloon */
9#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ 9#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
10#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory Stats virtqueue */
10 11
11/* Size of a PFN in the balloon interface. */ 12/* Size of a PFN in the balloon interface. */
12#define VIRTIO_BALLOON_PFN_SHIFT 12 13#define VIRTIO_BALLOON_PFN_SHIFT 12
@@ -18,4 +19,18 @@ struct virtio_balloon_config
18 /* Number of pages we've actually got in balloon. */ 19 /* Number of pages we've actually got in balloon. */
19 __le32 actual; 20 __le32 actual;
20}; 21};
22
23#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */
24#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */
25#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */
26#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */
27#define VIRTIO_BALLOON_S_MEMFREE 4 /* Total amount of free memory */
28#define VIRTIO_BALLOON_S_MEMTOT 5 /* Total amount of memory */
29#define VIRTIO_BALLOON_S_NR 6
30
31struct virtio_balloon_stat {
32 u16 tag;
33 u64 val;
34} __attribute__((packed));
35
21#endif /* _LINUX_VIRTIO_BALLOON_H */ 36#endif /* _LINUX_VIRTIO_BALLOON_H */