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 <xbt/signal.hpp>
9 #include "cpu_cas01.hpp"
10 #include "virtual_machine.hpp"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_vm, surf, "Logging specific to the SURF VM module");
14 simgrid::surf::VMModel *surf_vm_model = nullptr;
16 void surf_vm_model_init_HL13(){
17 if (surf_cpu_model_vm) {
18 surf_vm_model = new simgrid::surf::VMModel();
19 all_existing_models->push_back(surf_vm_model);
31 simgrid::xbt::signal<void(simgrid::surf::VirtualMachine*)> onVmCreation;
32 simgrid::xbt::signal<void(simgrid::surf::VirtualMachine*)> onVmDestruction;
33 simgrid::xbt::signal<void(simgrid::surf::VirtualMachine*)> onVmStateChange;
39 std::deque<VirtualMachine*> VirtualMachine::allVms_;
41 s4u::Host *VMModel::createVM(const char *name, sg_host_t host_PM)
43 VirtualMachine* vm = new VirtualMachine(this, name, host_PM);
48 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
49 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system. */
50 // const double virt_overhead = 0.95;
51 const double virt_overhead = 1;
53 double VMModel::nextOccuringEvent(double now)
55 /* TODO: update action's cost with the total cost of processes on the VM. */
57 /* 1. Now we know how many resource should be assigned to each virtual
58 * machine. We update constraints of the virtual machine layer.
60 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
61 * X1 + X2 = C (Equation 1)
63 * the resource share of VM1: X1
64 * the resource share of VM2: X2
65 * the capacity of PM1: C
67 * Then, if we have two process (P1 and P2) on VM1.
68 * X1_1 + X1_2 = X1 (Equation 2)
70 * the resource share of P1: X1_1
71 * the resource share of P2: X1_2
72 * the capacity of VM1: X1
74 * Equation 1 was solved in the physical machine layer.
75 * Equation 2 is solved in the virtual machine layer (here).
76 * X1 must be passed to the virtual machine laye as a constraint value.
79 /* iterate for all virtual machines */
80 for (VirtualMachine *ws_vm : VirtualMachine::allVms_) {
81 Cpu* cpu = ws_vm->piface_->pimpl_cpu;
82 xbt_assert(cpu, "cpu-less host");
84 double solved_value = ws_vm->action_->getVariable()->value;
85 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->piface_->name().c_str(),
86 ws_vm->getPm()->name().c_str());
88 // TODO: check lmm_update_constraint_bound() works fine instead of the below manual substitution.
89 // cpu_cas01->constraint->bound = solved_value;
90 xbt_assert(cpu->getModel() == surf_cpu_model_vm);
91 lmm_system_t vcpu_system = cpu->getModel()->getMaxminSystem();
92 lmm_update_constraint_bound(vcpu_system, cpu->getConstraint(), virt_overhead * solved_value);
95 /* 2. Calculate resource share at the virtual machine layer. */
96 adjustWeightOfDummyCpuActions();
98 /* 3. Ready. Get the next occuring event */
99 return surf_cpu_model_vm->nextOccuringEvent(now);
107 VirtualMachine::VirtualMachine(HostModel* model, const char* name, simgrid::s4u::Host* host_PM)
108 : HostImpl(model, name, nullptr /*storage*/), hostPM_(host_PM)
110 /* Register this VM to the list of all VMs */
111 allVms_.push_back(this);
113 piface_ = new simgrid::s4u::Host(name);
114 piface_->pimpl_ = this;
116 /* Currently, a VM uses the network resource of its physical host. In
117 * host_lib, this network resource object is referred from two different keys.
118 * When deregistering the reference that points the network resource object
119 * from the VM name, we have to make sure that the system does not call the
120 * free callback for the network resource object. The network resource object
121 * is still used by the physical machine. */
122 piface_->pimpl_netcard = host_PM->pimpl_netcard;
124 // //// CPU RELATED STUFF ////
125 // Roughly, create a vcpu resource by using the values of the sub_cpu one.
126 CpuCas01 *sub_cpu = dynamic_cast<CpuCas01*>(host_PM->pimpl_cpu);
128 piface_->pimpl_cpu = surf_cpu_model_vm->createCpu(piface_, sub_cpu->getSpeedPeakList(), 1 /*cores*/);
129 if (sub_cpu->getPState() != 0)
130 piface_->pimpl_cpu->setPState(sub_cpu->getPState());
132 /* We create cpu_action corresponding to a VM process on the host operating system. */
133 /* FIXME: TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
134 action_ = sub_cpu->execution_start(0);
136 XBT_VERB("Create VM(%s)@PM(%s) with %ld mounted disks", name, hostPM_->name().c_str(), xbt_dynar_length(storage_));
140 * A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation.
142 VirtualMachine::~VirtualMachine()
144 onVmDestruction(this);
145 allVms_.erase( find(allVms_.begin(), allVms_.end(), this) );
147 /* Free the cpu_action of the VM. */
148 XBT_ATTRIB_UNUSED int ret = action_->unref();
149 xbt_assert(ret == 1, "Bug: some resource still remains");
152 e_surf_vm_state_t VirtualMachine::getState() {
156 void VirtualMachine::setState(e_surf_vm_state_t state)
160 void VirtualMachine::suspend()
163 vmState_ = SURF_VM_STATE_SUSPENDED;
166 void VirtualMachine::resume()
169 vmState_ = SURF_VM_STATE_RUNNING;
172 void VirtualMachine::save()
174 vmState_ = SURF_VM_STATE_SAVING;
176 vmState_ = SURF_VM_STATE_SAVED;
179 void VirtualMachine::restore()
181 vmState_ = SURF_VM_STATE_RESTORING;
183 vmState_ = SURF_VM_STATE_RUNNING;
186 /** @brief returns the physical machine on which the VM is running **/
187 sg_host_t VirtualMachine::getPm() {
191 /* Update the physical host of the given VM */
192 void VirtualMachine::migrate(sg_host_t host_dest)
194 const char* vm_name = piface_->name().c_str();
195 const char* pm_name_src = hostPM_->name().c_str();
196 const char* pm_name_dst = host_dest->name().c_str();
198 /* update net_elm with that of the destination physical host */
199 piface_->pimpl_netcard = host_dest->pimpl_netcard;
203 /* Update vcpu's action for the new pm */
204 /* create a cpu action bound to the pm model at the destination. */
205 CpuAction* new_cpu_action = static_cast<CpuAction*>(host_dest->pimpl_cpu->execution_start(0));
207 Action::State state = action_->getState();
208 if (state != Action::State::done)
209 XBT_CRITICAL("FIXME: may need a proper handling, %d", static_cast<int>(state));
210 if (action_->getRemainsNoUpdate() > 0)
211 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->getRemainsNoUpdate());
213 /* keep the bound value of the cpu action of the VM. */
214 double old_bound = action_->getBound();
215 if (old_bound != 0) {
216 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
217 new_cpu_action->setBound(old_bound);
220 XBT_ATTRIB_UNUSED int ret = action_->unref();
221 xbt_assert(ret == 1, "Bug: some resource still remains");
223 action_ = new_cpu_action;
225 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
228 void VirtualMachine::setBound(double bound){
229 action_->setBound(bound);