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From ahu...@apache.org
Subject [44/50] [abbrv] git commit: updated refs/heads/vmsync to 05cb734
Date Mon, 20 May 2013 18:47:59 GMT
CLOUDSTACK-2554: Ensuring that we honor hypervisor xen's memory constraints

When setting memory constraints on Xen guests we should honor:
static-min <= dynamic-min <= dynamic-max <= static-max

Our VmSpec while allows the guests to like between dynamic-min and
dynamic-max the memory set by the resource set the static min to be
equal to the dynamic max. This restricts the hypervisor from ensuring
optimized memory handling of guests.

see: http://wiki.xen.org/wiki/XCP_FAQ_Dynamic_Memory_Control#How_does_XCP_choose_targets_for_guests_in_dynamic_range_mode.3F

Another fix was related the restrict_dmc option. when enabled (true)
this option disallows scaling a vm. The logic was reverse handled
allowing scaling when restrict_dmc was on. This control flow is now
fixed.

Signed-off-by: Prasanna Santhanam <tsp@apache.org>


Project: http://git-wip-us.apache.org/repos/asf/cloudstack/repo
Commit: http://git-wip-us.apache.org/repos/asf/cloudstack/commit/7ea2c950
Tree: http://git-wip-us.apache.org/repos/asf/cloudstack/tree/7ea2c950
Diff: http://git-wip-us.apache.org/repos/asf/cloudstack/diff/7ea2c950

Branch: refs/heads/vmsync
Commit: 7ea2c950f5c1c2446ae94087d7f78812cc94a658
Parents: 6ea2b06
Author: Prasanna Santhanam <tsp@apache.org>
Authored: Sun May 19 16:07:18 2013 +0530
Committer: Prasanna Santhanam <tsp@apache.org>
Committed: Sun May 19 18:34:27 2013 +0530

----------------------------------------------------------------------
 .../xen/resource/CitrixResourceBase.java           |   25 +++++-
 .../hypervisor/xen/resource/XcpServerResource.java |   73 ++++++++++++---
 .../xen/resource/XenServer56FP1Resource.java       |   36 ++++----
 3 files changed, 98 insertions(+), 36 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/cloudstack/blob/7ea2c950/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
----------------------------------------------------------------------
diff --git a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
index a166347..78bca32 100644
--- a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
+++ b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
@@ -335,6 +335,9 @@ public abstract class CitrixResourceBase implements ServerResource, HypervisorRe
     long _xs_memory_used = 128 * 1024 * 1024L; // xen hypervisor used 128 M
     double _xs_virtualization_factor = 63.0/64.0;  // 1 - virtualization overhead
 
+    //static min values for guests on xen
+    private static final long mem_128m = 134217728L;
+
     protected boolean _canBridgeFirewall = false;
     protected boolean _isOvs = false;
     protected List<VIF> _tmpDom0Vif = new ArrayList<VIF>();
@@ -1208,8 +1211,11 @@ public abstract class CitrixResourceBase implements ServerResource,
HypervisorRe
         }
         Set<VM> templates = VM.getByNameLabel(conn, guestOsTypeName);
         assert templates.size() == 1 : "Should only have 1 template but found " + templates.size();
+        if (!templates.iterator().hasNext()) {
+            throw new CloudRuntimeException("No matching OS type found for starting a ["
+ vmSpec.getOs()
+                    + "] VM on host " + host.getHostname(conn));
+        }
         VM template = templates.iterator().next();
-
         VM vm = template.createClone(conn, vmSpec.getName());
         VM.Record vmr = vm.getRecord(conn);
         if (s_logger.isDebugEnabled()) {
@@ -3503,8 +3509,21 @@ public abstract class CitrixResourceBase implements ServerResource,
HypervisorRe
         }
     }
 
+    /**
+     * WARN: static-min <= dynamic-min <= dynamic-max <= static-max
+     * @see XcpServerResource#setMemory(com.xensource.xenapi.Connection, com.xensource.xenapi.VM,
long, long)
+     * @param conn
+     * @param vm
+     * @param minMemsize
+     * @param maxMemsize
+     * @throws XmlRpcException
+     * @throws XenAPIException
+     */
     protected void setMemory(Connection conn, VM vm, long minMemsize, long maxMemsize) throws
XmlRpcException, XenAPIException {
-        vm.setMemoryLimits(conn, maxMemsize, maxMemsize, minMemsize, maxMemsize);
+        vm.setMemoryStaticMin(conn, mem_128m);
+        vm.setMemoryDynamicMin(conn, minMemsize);
+        vm.setMemoryDynamicMax(conn, maxMemsize);
+        vm.setMemoryStaticMax(conn, maxMemsize);
     }
 
     protected void waitForTask(Connection c, Task task, long pollInterval, long timeout)
throws XenAPIException, XmlRpcException {
@@ -4299,7 +4318,7 @@ public abstract class CitrixResourceBase implements ServerResource,
HypervisorRe
      * @throws XenAPIException
      * @throws XmlRpcException
      * 
-     * @see enableVlanNetwork
+     * @see CitrixResourceBase#enableVlanNetwork
      */
     protected XsLocalNetwork getNetworkByName(Connection conn, String name) throws XenAPIException,
XmlRpcException {
         Set<Network> networks = Network.getByNameLabel(conn, name);

http://git-wip-us.apache.org/repos/asf/cloudstack/blob/7ea2c950/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XcpServerResource.java
----------------------------------------------------------------------
diff --git a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XcpServerResource.java
b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XcpServerResource.java
index 77dcb8f..7df4c46 100644
--- a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XcpServerResource.java
+++ b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XcpServerResource.java
@@ -37,6 +37,8 @@ import java.util.List;
 @Local(value=ServerResource.class)
 public class XcpServerResource extends CitrixResourceBase {
     private final static Logger s_logger = Logger.getLogger(XcpServerResource.class);
+    private static final long mem_32m = 33554432L;
+
     private String version;
 
     public XcpServerResource() {
@@ -70,20 +72,6 @@ public class XcpServerResource extends CitrixResourceBase {
         return CitrixHelper.getXcpGuestOsType(stdType);
     }
 
-    @Override
-    protected void setMemory(Connection conn, VM vm, long minMemsize, long maxMemsize) throws
XmlRpcException, XenAPIException {
-
-        vm.setMemoryStaticMin(conn, 33554432L);
-        //vm.setMemoryDynamicMin(conn, 33554432L);
-        //vm.setMemoryDynamicMax(conn, 33554432L);
-        vm.setMemoryStaticMax(conn, 33554432L);
-
-        //vm.setMemoryStaticMax(conn, maxMemsize );
-        vm.setMemoryDynamicMax(conn, maxMemsize );
-        vm.setMemoryDynamicMin(conn, minMemsize );
-        //vm.setMemoryStaticMin(conn,  maxMemsize );
-    }
-    
     protected NetworkUsageAnswer execute(NetworkUsageCommand cmd) {
         try {
             Connection conn = getConnection();
@@ -100,4 +88,61 @@ public class XcpServerResource extends CitrixResourceBase {
             return new NetworkUsageAnswer(cmd, ex);
         }
     }
+
+    /**
+     XCP provides four memory configuration fields through which
+     administrators can control this behaviour:
+
+     * static-min
+     * dynamic-min
+     * dynamic-max
+     * static-max
+
+     The fields static-{min,max} act as *hard* lower and upper
+     bounds for a guest's memory. For a running guest:
+     * it's not possible to assign the guest more memory than
+     static-max without first shutting down the guest.
+     * it's not possible to assign the guest less memory than
+     static-min without first shutting down the guest.
+
+     The fields dynamic-{min,max} act as *soft* lower and upper
+     bounds for a guest's memory. It's possible to change these
+     fields even when a guest is running.
+
+     The dynamic range must lie wholly within the static range. To
+     put it another way, XCP at all times ensures that:
+
+     static-min <= dynamic-min <= dynamic-max <= static-max
+
+     At all times, XCP will attempt to keep a guest's memory usage
+     between dynamic-min and dynamic-max.
+
+     If dynamic-min = dynamic-max, then XCP will attempt to keep
+     a guest's memory allocation at a constant size.
+
+     If dynamic-min < dynamic-max, then XCP will attempt to give
+     the guest as much memory as possible, while keeping the guest
+     within dynamic-min and dynamic-max.
+
+     If there is enough memory on a given host to give all resident
+     guests dynamic-max, then XCP will attempt do so.
+
+     If there is not enough memory to give all guests dynamic-max,
+     then XCP will ask each of the guests (on that host) to use
+     an amount of memory that is the same *proportional* distance
+     between dynamic-min and dynamic-max.
+
+     XCP will refuse to start guests if starting those guests would
+     cause the sum of all the dynamic-min values to exceed the total
+     host memory (taking into account various memory overheads).
+
+     cf: http://wiki.xen.org/wiki/XCP_FAQ_Dynamic_Memory_Control
+     */
+    @Override
+    protected void setMemory(Connection conn, VM vm, long minMemsize, long maxMemsize) throws
XmlRpcException, XenAPIException {
+        vm.setMemoryStaticMin(conn, mem_32m);
+        vm.setMemoryDynamicMin(conn, minMemsize);
+        vm.setMemoryDynamicMax(conn, maxMemsize);
+        vm.setMemoryStaticMax(conn, maxMemsize);
+    }
 }

http://git-wip-us.apache.org/repos/asf/cloudstack/blob/7ea2c950/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
----------------------------------------------------------------------
diff --git a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
index 24cb75c..ad412c1 100644
--- a/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
+++ b/plugins/hypervisors/xen/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
@@ -17,18 +17,6 @@
 package com.cloud.hypervisor.xen.resource;
 
 
-import java.io.File;
-import java.util.ArrayList;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import javax.ejb.Local;
-import org.apache.log4j.Logger;
-import org.apache.xmlrpc.XmlRpcException;
-
 import com.cloud.agent.api.FenceAnswer;
 import com.cloud.agent.api.FenceCommand;
 import com.cloud.agent.api.to.VirtualMachineTO;
@@ -39,13 +27,23 @@ import com.cloud.template.VirtualMachineTemplate.BootloaderType;
 import com.cloud.utils.exception.CloudRuntimeException;
 import com.cloud.utils.script.Script;
 import com.xensource.xenapi.Connection;
-import com.xensource.xenapi.Console;
 import com.xensource.xenapi.Host;
 import com.xensource.xenapi.Types;
+import com.xensource.xenapi.Types.XenAPIException;
 import com.xensource.xenapi.VBD;
 import com.xensource.xenapi.VDI;
 import com.xensource.xenapi.VM;
-import com.xensource.xenapi.Types.XenAPIException;
+import org.apache.log4j.Logger;
+import org.apache.xmlrpc.XmlRpcException;
+
+import javax.ejb.Local;
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 @Local(value=ServerResource.class)
 public class XenServer56FP1Resource extends XenServer56Resource {
@@ -137,17 +135,17 @@ public class XenServer56FP1Resource extends XenServer56Resource {
         record.nameLabel = vmSpec.getName();
         record.actionsAfterCrash = Types.OnCrashBehaviour.DESTROY;
         record.actionsAfterShutdown = Types.OnNormalExit.DESTROY;
-        record.memoryDynamicMax = vmSpec.getMaxRam();
         record.memoryDynamicMin = vmSpec.getMinRam();
+        record.memoryDynamicMax = vmSpec.getMaxRam();
         Map<String, String> hostParams = new HashMap<String, String>();
         hostParams = host.getLicenseParams(conn);
         if (hostParams.get("restrict_dmc").equalsIgnoreCase("false")) {
-            record.memoryStaticMax = 8589934592L; //8GB
-            record.memoryStaticMin = 134217728L; //128MB
+            record.memoryStaticMin = vmSpec.getMinRam();
+            record.memoryStaticMax = vmSpec.getMaxRam();
         } else {
             s_logger.warn("Host "+ _host.uuid + " does not support Dynamic Memory Control,
so we cannot scale up the vm");
-            record.memoryStaticMax = vmSpec.getMaxRam();
-            record.memoryStaticMin = vmSpec.getMinRam();
+            record.memoryStaticMin = 134217728L; //128MB
+            record.memoryStaticMax = 8589934592L; //8GB
         }
 
         if (guestOsTypeName.toLowerCase().contains("windows")) {


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