1 /* Copyright (c) 2013-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
7 #include "src/surf/VirtualMachineImpl.hpp"
8 #include "simgrid/s4u/VirtualMachine.hpp"
10 #include <xbt/signal.hpp>
12 #include "cpu_cas01.hpp"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_vm, surf, "Logging specific to the SURF VM module");
16 simgrid::surf::VMModel* surf_vm_model = nullptr;
18 void surf_vm_model_init_HL13()
20 if (surf_cpu_model_vm) {
21 surf_vm_model = new simgrid::surf::VMModel();
22 all_existing_models->push_back(surf_vm_model);
33 simgrid::xbt::signal<void(simgrid::surf::VirtualMachineImpl*)> onVmCreation;
34 simgrid::xbt::signal<void(simgrid::surf::VirtualMachineImpl*)> onVmDestruction;
35 simgrid::xbt::signal<void(simgrid::surf::VirtualMachineImpl*)> onVmStateChange;
41 std::deque<VirtualMachineImpl*> VirtualMachineImpl::allVms_;
43 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
44 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system. */
45 // const double virt_overhead = 0.95;
46 const double virt_overhead = 1;
48 double VMModel::nextOccuringEvent(double now)
50 /* TODO: update action's cost with the total cost of processes on the VM. */
52 /* 1. Now we know how many resource should be assigned to each virtual
53 * machine. We update constraints of the virtual machine layer.
55 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
56 * X1 + X2 = C (Equation 1)
58 * the resource share of VM1: X1
59 * the resource share of VM2: X2
60 * the capacity of PM1: C
62 * Then, if we have two process (P1 and P2) on VM1.
63 * X1_1 + X1_2 = X1 (Equation 2)
65 * the resource share of P1: X1_1
66 * the resource share of P2: X1_2
67 * the capacity of VM1: X1
69 * Equation 1 was solved in the physical machine layer.
70 * Equation 2 is solved in the virtual machine layer (here).
71 * X1 must be passed to the virtual machine laye as a constraint value.
74 /* iterate for all virtual machines */
75 for (VirtualMachineImpl* ws_vm : VirtualMachineImpl::allVms_) {
76 Cpu* cpu = ws_vm->piface_->pimpl_cpu;
77 xbt_assert(cpu, "cpu-less host");
79 double solved_value = ws_vm->action_->getVariable()->value;
80 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->piface_->name().c_str(),
81 ws_vm->getPm()->name().c_str());
83 // TODO: check lmm_update_constraint_bound() works fine instead of the below manual substitution.
84 // cpu_cas01->constraint->bound = solved_value;
85 xbt_assert(cpu->getModel() == surf_cpu_model_vm);
86 lmm_system_t vcpu_system = cpu->getModel()->getMaxminSystem();
87 lmm_update_constraint_bound(vcpu_system, cpu->getConstraint(), virt_overhead * solved_value);
90 /* 2. Calculate resource share at the virtual machine layer. */
91 adjustWeightOfDummyCpuActions();
93 /* 3. Ready. Get the next occuring event */
94 return surf_cpu_model_vm->nextOccuringEvent(now);
101 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::Host* piface, simgrid::s4u::Host* host_PM)
102 : HostImpl(piface, nullptr /*storage*/), hostPM_(host_PM)
104 /* Register this VM to the list of all VMs */
105 allVms_.push_back(this);
107 /* Currently, a VM uses the network resource of its physical host. In
108 * host_lib, this network resource object is referred from two different keys.
109 * When deregistering the reference that points the network resource object
110 * from the VM name, we have to make sure that the system does not call the
111 * free callback for the network resource object. The network resource object
112 * is still used by the physical machine. */
113 piface_->pimpl_netcard = host_PM->pimpl_netcard;
115 // //// CPU RELATED STUFF ////
116 // Roughly, create a vcpu resource by using the values of the sub_cpu one.
117 CpuCas01* sub_cpu = dynamic_cast<CpuCas01*>(host_PM->pimpl_cpu);
119 piface_->pimpl_cpu = surf_cpu_model_vm->createCpu(piface_, sub_cpu->getSpeedPeakList(), 1 /*cores*/);
120 if (sub_cpu->getPState() != 0)
121 piface_->pimpl_cpu->setPState(sub_cpu->getPState());
123 /* We create cpu_action corresponding to a VM process on the host operating system. */
124 /* FIXME: TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
125 action_ = sub_cpu->execution_start(0);
127 XBT_VERB("Create VM(%s)@PM(%s) with %ld mounted disks", piface->name().c_str(), hostPM_->name().c_str(),
128 xbt_dynar_length(storage_));
132 * A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation.
134 VirtualMachineImpl::~VirtualMachineImpl()
136 onVmDestruction(this);
137 allVms_.erase(find(allVms_.begin(), allVms_.end(), this));
139 /* Free the cpu_action of the VM. */
140 XBT_ATTRIB_UNUSED int ret = action_->unref();
141 xbt_assert(ret == 1, "Bug: some resource still remains");
144 e_surf_vm_state_t VirtualMachineImpl::getState()
149 void VirtualMachineImpl::setState(e_surf_vm_state_t state)
153 void VirtualMachineImpl::suspend()
156 vmState_ = SURF_VM_STATE_SUSPENDED;
159 void VirtualMachineImpl::resume()
162 vmState_ = SURF_VM_STATE_RUNNING;
165 void VirtualMachineImpl::save()
167 vmState_ = SURF_VM_STATE_SAVING;
169 vmState_ = SURF_VM_STATE_SAVED;
172 void VirtualMachineImpl::restore()
174 vmState_ = SURF_VM_STATE_RESTORING;
176 vmState_ = SURF_VM_STATE_RUNNING;
179 /** @brief returns the physical machine on which the VM is running **/
180 s4u::Host* VirtualMachineImpl::getPm()
185 /* Update the physical host of the given VM */
186 void VirtualMachineImpl::migrate(s4u::Host* host_dest)
188 const char* vm_name = piface_->name().c_str();
189 const char* pm_name_src = hostPM_->name().c_str();
190 const char* pm_name_dst = host_dest->name().c_str();
192 /* update net_elm with that of the destination physical host */
193 piface_->pimpl_netcard = host_dest->pimpl_netcard;
197 /* Update vcpu's action for the new pm */
198 /* create a cpu action bound to the pm model at the destination. */
199 CpuAction* new_cpu_action = static_cast<CpuAction*>(host_dest->pimpl_cpu->execution_start(0));
201 Action::State state = action_->getState();
202 if (state != Action::State::done)
203 XBT_CRITICAL("FIXME: may need a proper handling, %d", static_cast<int>(state));
204 if (action_->getRemainsNoUpdate() > 0)
205 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->getRemainsNoUpdate());
207 /* keep the bound value of the cpu action of the VM. */
208 double old_bound = action_->getBound();
209 if (old_bound != 0) {
210 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
211 new_cpu_action->setBound(old_bound);
214 XBT_ATTRIB_UNUSED int ret = action_->unref();
215 xbt_assert(ret == 1, "Bug: some resource still remains");
217 action_ = new_cpu_action;
219 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
222 void VirtualMachineImpl::setBound(double bound)
224 action_->setBound(bound);