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virtio: Add memory statistics reporting to the balloon driver

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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>
This commit is contained in:
Adam Litke 2010-01-26 14:17:35 -06:00 • committed by Anthony Liguori
parent 940cc30d0d
commit 625a5befc2
6 changed files with 219 additions and 52 deletions
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3
qemu-monitor.hx
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@ -891,7 +891,8 @@ ETEXI
.params = "target",
.help = "request VM to change it's memory allocation (in MB)",
.user_print = monitor_user_noop,
.mhandler.cmd_new = do_balloon,
.mhandler.cmd_async = do_balloon,
.async = 1,
},
STEXI