diff options
author | Adam Litke <agl@us.ibm.com> | 2009-11-30 11:14:15 -0500 |
---|---|---|
committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-02-23 22:52:08 -0500 |
commit | 9564e138b1f6eb137f7149772438d3f3fb3277dd (patch) | |
tree | 2e53562c2b7ab7051d448b8f81766dc61ad524b5 /include | |
parent | 1f08b833ddbdb1c8e81c4b1053c2ebb7b89cb437 (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')
-rw-r--r-- | include/linux/virtio_balloon.h | 15 |
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 | |||
31 | struct 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 */ |