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new 3381c38 CLOUDSTACK-10073: KVM host RAM overprovisioning (#2266)
3381c38 is described below
commit 3381c38cc73f3e52b2f02107db8f74c9294de712
Author: Bitworks Software, Ltd <b...@users.noreply.github.com>
AuthorDate: Fri Sep 29 13:16:09 2017 +0700
CLOUDSTACK-10073: KVM host RAM overprovisioning (#2266)
Commit enables a new feature for KVM hypervisor which purpose is to
increase virtually amount of RAM available beyond the actual limit.
There is a new parameter in agent.properties: host.overcommit.mem.mb which
enables adding specified amount of RAM to actually available. It is necessary
to utilize KSM and ZSwap features which extend RAM with deduplication and
compression.
---
agent/conf/agent.properties | 8 ++++++--
.../hypervisor/kvm/resource/LibvirtComputingResource.java | 11 +++++++++--
2 files changed, 15 insertions(+), 4 deletions(-)
diff --git a/agent/conf/agent.properties b/agent/conf/agent.properties
index 22741b5..0354ace 100644
--- a/agent/conf/agent.properties
+++ b/agent/conf/agent.properties
@@ -176,11 +176,15 @@ hypervisor.type=kvm
# vm.rng.rate.period=1000
# The number of milliseconds in which the guest is allowed to obtain the bytes
# specified above.
-
+#
# router.aggregation.command.each.timeout=600
# timeout value for aggregation commands send to virtual router
#
-
+# host.overcommit.mem.mb = 0
+# allows to increase amount of ram available on host virtually to utilize
Zswap, KSM features
+# and modern fast SSD/3D XPoint devices. Specified amount of MBs is added to
the memory agent
+# reports to the Management Server
+# Default: 0
#
# vm.watchdog.model=i6300esb
# The model of Watchdog timer to present to the Guest
diff --git
a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
index 104d435..7794249 100644
---
a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
+++
b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
@@ -304,6 +304,8 @@ public class LibvirtComputingResource extends
ServerResourceBase implements Serv
private long _dom0MinMem;
+ private long _dom0OvercommitMem;
+
protected boolean _disconnected = true;
protected int _cmdsTimeout;
protected int _stopTimeout;
@@ -849,6 +851,11 @@ public class LibvirtComputingResource extends
ServerResourceBase implements Serv
// Reserve 1GB unless admin overrides
_dom0MinMem = NumbersUtil.parseInt(value, 1024) * 1024 * 1024L;
+ value = (String)params.get("host.overcommit.mem.mb");
+ // Support overcommit memory for host if host uses ZSWAP, KSM and
other memory
+ // compressing technologies
+ _dom0OvercommitMem = NumbersUtil.parseInt(value, 0) * 1024 * 1024L;
+
value = (String) params.get("kvmclock.disable");
if (Boolean.parseBoolean(value)) {
_noKvmClock = true;
@@ -2782,12 +2789,12 @@ public class LibvirtComputingResource extends
ServerResourceBase implements Serv
info.add((int)cpus);
info.add(speed);
// Report system's RAM as actual RAM minus host OS reserved RAM
- ram = ram - _dom0MinMem;
+ ram = ram - _dom0MinMem + _dom0OvercommitMem;
info.add(ram);
info.add(cap);
info.add(_dom0MinMem);
info.add(cpuSockets);
- s_logger.debug("cpus=" + cpus + ", speed=" + speed + ", ram=" + ram +
", _dom0MinMem=" + _dom0MinMem + ", cpu sockets=" + cpuSockets);
+ s_logger.debug("cpus=" + cpus + ", speed=" + speed + ", ram=" + ram +
", _dom0MinMem=" + _dom0MinMem + ", _dom0OvercommitMem=" + _dom0OvercommitMem +
", cpu sockets=" + cpuSockets);
return info;
}
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