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Define public API for receiving guest memory balloon events

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When the guest changes its memory balloon applications may want
to know what the new value is, without having to periodically
poll on XML / domain info. Introduce a "balloon change" event
to let apps see this

* include/libvirt/libvirt.h.in: Define the
  virConnectDomainEventBalloonChangeCallback callback
  and VIR_DOMAIN_EVENT_ID_BALLOON_CHANGE constant
* python/libvirt-override-virConnect.py,
  python/libvirt-override.c: Wire up helpers for new event
* daemon/remote.c: Helper for serializing balloon event
* examples/domain-events/events-c/event-test.c,
  examples/domain-events/events-python/event-test.py: Add
  example of balloon event usage
* src/conf/domain_event.c, src/conf/domain_event.h: Handling
  of balloon events
* src/remote/remote_driver.c: Add handler of balloon events
* src/remote/remote_protocol.x: Define wire protocol for
  balloon events
* src/remote_protocol-structs: Likewise.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange
2012-07-13 17:05:17 +08:00
committed by Guannan Ren
parent db4eba91a7
commit 7ed6d7dda7
12 changed files with 211 additions and 2 deletions
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28
daemon/remote.c
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@@ -582,6 +582,33 @@ static int remoteRelayDomainEventPMSuspend(virConnectPtr conn ATTRIBUTE_UNUSED,
return 0;
}
static int
remoteRelayDomainEventBalloonChange(virConnectPtr conn ATTRIBUTE_UNUSED,
virDomainPtr dom,
unsigned long long actual,
void *opaque)
{
virNetServerClientPtr client = opaque;
remote_domain_event_balloon_change_msg data;
if (!client)
return -1;
VIR_DEBUG("Relaying domain balloon change event %s %d %lld", dom->name, dom->id, actual);
/* build return data */
memset(&data, 0, sizeof(data));
make_nonnull_domain(&data.dom, dom);
data.actual = actual;
remoteDispatchDomainEventSend(client, remoteProgram,
REMOTE_PROC_DOMAIN_EVENT_BALLOON_CHANGE,
(xdrproc_t)xdr_remote_domain_event_balloon_change_msg, &data);
return 0;
}
static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventLifecycle),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventReboot),
@@ -596,6 +623,7 @@ static virConnectDomainEventGenericCallback domainEventCallbacks[] = {
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventTrayChange),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventPMWakeup),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventPMSuspend),
VIR_DOMAIN_EVENT_CALLBACK(remoteRelayDomainEventBalloonChange),
};
verify(ARRAY_CARDINALITY(domainEventCallbacks) == VIR_DOMAIN_EVENT_ID_LAST);