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| author | Adam Litke <agl@us.ibm.com> | 2010-01-26 14:17:35 -0600 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2010-01-26 17:08:03 -0600 |
| commit | 625a5befc2e3200b396594f002218d235e375da5 (patch) | |
| tree | 89b9362c879d319b5061424035e3dbead9555e70 /hw/virtio-balloon.h | |
| parent | 940cc30d0d456781adcc48bf9f8c5582026d7983 (diff) | |
| download | qemu-625a5befc2e3200b396594f002218d235e375da5.tar.gz | |
virtio: Add memory statistics reporting to the balloon driver
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.
Signed-off-by: Adam Litke <agl@us.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/virtio-balloon.h')
| -rw-r--r-- | hw/virtio-balloon.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/hw/virtio-balloon.h b/hw/virtio-balloon.h index 9a0d119e42..e20cf6bc0d 100644 --- a/hw/virtio-balloon.h +++ b/hw/virtio-balloon.h @@ -25,6 +25,7 @@ /* The feature bitmap for virtio balloon */ #define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */ +#define VIRTIO_BALLOON_F_STATS_VQ 1 /* Memory stats virtqueue */ /* Size of a PFN in the balloon interface. */ #define VIRTIO_BALLOON_PFN_SHIFT 12 @@ -37,4 +38,18 @@ struct virtio_balloon_config uint32_t actual; }; +/* Memory Statistics */ +#define VIRTIO_BALLOON_S_SWAP_IN 0 /* Amount of memory swapped in */ +#define VIRTIO_BALLOON_S_SWAP_OUT 1 /* Amount of memory swapped out */ +#define VIRTIO_BALLOON_S_MAJFLT 2 /* Number of major faults */ +#define VIRTIO_BALLOON_S_MINFLT 3 /* Number of minor faults */ +#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_NR 6 + +typedef struct VirtIOBalloonStat { + uint16_t tag; + uint64_t val; +} __attribute__((packed)) VirtIOBalloonStat; + #endif |