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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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7
balloon.h
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@ -16,12 +16,13 @@
#include "cpu-defs.h"
typedef ram_addr_t (QEMUBalloonEvent)(void *opaque, ram_addr_t target);
typedef void (QEMUBalloonEvent)(void *opaque, ram_addr_t target,
MonitorCompletion cb, void *cb_data);
void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque);
void qemu_balloon(ram_addr_t target);
int qemu_balloon(ram_addr_t target, MonitorCompletion cb, void *opaque);
ram_addr_t qemu_balloon_status(void);
int qemu_balloon_status(MonitorCompletion cb, void *opaque);
#endif