1 /* Copyright (c) 2013-2018. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "src/plugins/vm/VirtualMachineImpl.hpp"
7 #include "src/simix/ActorImpl.hpp"
8 #include "src/simix/smx_host_private.hpp"
10 #include <xbt/asserts.h> // xbt_log_no_loc
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_vm, surf, "Logging specific to the SURF VM module");
14 simgrid::vm::VMModel* surf_vm_model = nullptr;
16 void surf_vm_model_init_HL13()
18 if (surf_cpu_model_vm) {
19 surf_vm_model = new simgrid::vm::VMModel();
20 all_existing_models->push_back(surf_vm_model);
29 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> simgrid::vm::VirtualMachineImpl::onVmCreation;
30 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> simgrid::vm::VirtualMachineImpl::onVmDestruction;
31 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> simgrid::vm::VirtualMachineImpl::onVmStateChange;
39 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
41 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
42 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
43 * FIXME: add a configuration flag for this
45 const double virt_overhead = 1; // 0.95
47 static void hostStateChange(s4u::Host& host)
49 if (host.isOff()) { // just turned off.
50 std::vector<s4u::VirtualMachine*> trash;
51 /* Find all VMs living on that host */
52 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
53 if (vm->getPm() == &host)
55 for (s4u::VirtualMachine* vm : trash)
61 s4u::Host::onStateChange.connect(hostStateChange);
64 double VMModel::nextOccuringEvent(double now)
66 /* TODO: update action's cost with the total cost of processes on the VM. */
68 /* 1. Now we know how many resource should be assigned to each virtual
69 * machine. We update constraints of the virtual machine layer.
71 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
72 * X1 + X2 = C (Equation 1)
74 * the resource share of VM1: X1
75 * the resource share of VM2: X2
76 * the capacity of PM1: C
78 * Then, if we have two process (P1 and P2) on VM1.
79 * X1_1 + X1_2 = X1 (Equation 2)
81 * the resource share of P1: X1_1
82 * the resource share of P2: X1_2
83 * the capacity of VM1: X1
85 * Equation 1 was solved in the physical machine layer.
86 * Equation 2 is solved in the virtual machine layer (here).
87 * X1 must be passed to the virtual machine layer as a constraint value.
90 /* iterate for all virtual machines */
91 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
92 surf::Cpu* cpu = ws_vm->pimpl_cpu;
93 xbt_assert(cpu, "cpu-less host");
95 double solved_value = ws_vm->getImpl()->action_->getVariable()->get_value(); // this is X1 in comment above, what
96 // this VM got in the sharing on the PM
97 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->getCname(), ws_vm->getPm()->getCname());
99 xbt_assert(cpu->model() == surf_cpu_model_vm);
100 kernel::lmm::System* vcpu_system = cpu->model()->getMaxminSystem();
101 vcpu_system->update_constraint_bound(cpu->constraint(), virt_overhead * solved_value);
104 /* 2. Calculate resource share at the virtual machine layer. */
105 ignoreEmptyVmInPmLMM();
107 /* 3. Ready. Get the next occurring event */
108 return surf_cpu_model_vm->nextOccuringEvent(now);
115 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::VirtualMachine* piface, simgrid::s4u::Host* host_PM,
116 int coreAmount, size_t ramsize)
117 : HostImpl(piface), hostPM_(host_PM), coreAmount_(coreAmount), ramsize_(ramsize)
119 /* Register this VM to the list of all VMs */
120 allVms_.push_back(piface);
122 /* We create cpu_action corresponding to a VM process on the host operating system. */
123 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
124 action_ = host_PM->pimpl_cpu->execution_start(0, coreAmount);
126 XBT_VERB("Create VM(%s)@PM(%s)", piface->getCname(), hostPM_->getCname());
130 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
131 VirtualMachineImpl::~VirtualMachineImpl()
133 onVmDestruction(this);
134 /* I was already removed from the allVms set if the VM was destroyed cleanly */
135 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
136 if (iter != allVms_.end())
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)
154 void VirtualMachineImpl::suspend(smx_actor_t issuer)
156 if (getState() != SURF_VM_STATE_RUNNING)
157 THROWF(vm_error, 0, "Cannot suspend VM %s: it is not running.", piface_->getCname());
158 if (issuer->host == piface_)
159 THROWF(vm_error, 0, "Actor %s cannot suspend the VM %s in which it runs", issuer->getCname(), piface_->getCname());
161 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
162 XBT_DEBUG("suspend VM(%s), where %zu processes exist", piface_->getCname(), process_list.size());
166 for (auto& smx_process : process_list) {
167 XBT_DEBUG("suspend %s", smx_process.name.c_str());
168 smx_process.suspend(issuer);
171 XBT_DEBUG("suspend all processes on the VM done done");
173 vmState_ = SURF_VM_STATE_SUSPENDED;
176 void VirtualMachineImpl::resume()
178 if (getState() != SURF_VM_STATE_SUSPENDED)
179 THROWF(vm_error, 0, "Cannot resume VM %s: it was not suspended", piface_->getCname());
181 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
182 XBT_DEBUG("Resume VM %s, containing %zu processes.", piface_->getCname(), process_list.size());
186 for (auto& smx_process : process_list) {
187 XBT_DEBUG("resume %s", smx_process.getCname());
188 smx_process.resume();
191 vmState_ = SURF_VM_STATE_RUNNING;
194 /** @brief Power off a VM.
196 * All hosted processes will be killed, but the VM state is preserved on memory.
197 * It can later be restarted.
199 * @param issuer the actor requesting the shutdown
201 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
203 if (getState() != SURF_VM_STATE_RUNNING) {
204 const char* stateName = "(unknown state)";
205 switch (getState()) {
206 case SURF_VM_STATE_CREATED:
207 stateName = "created, but not yet started";
209 case SURF_VM_STATE_SUSPENDED:
210 stateName = "suspended";
212 case SURF_VM_STATE_DESTROYED:
213 stateName = "destroyed";
215 default: /* SURF_VM_STATE_RUNNING or unexpected values */
219 XBT_VERB("Shutting down the VM %s even if it's not running but %s", piface_->getCname(), stateName);
222 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
223 XBT_DEBUG("shutdown VM %s, that contains %zu processes", piface_->getCname(), process_list.size());
225 for (auto& smx_process : process_list) {
226 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", smx_process.getCname(),
227 smx_process.host->getCname(), issuer->getCname());
228 SIMIX_process_kill(&smx_process, issuer);
231 setState(SURF_VM_STATE_DESTROYED);
233 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
236 /** @brief returns the physical machine on which the VM is running **/
237 s4u::Host* VirtualMachineImpl::getPm()
242 /** @brief Change the physical host on which the given VM is running
244 * This is an instantaneous migration.
246 void VirtualMachineImpl::setPm(s4u::Host* destination)
248 const char* vm_name = piface_->getCname();
249 const char* pm_name_src = hostPM_->getCname();
250 const char* pm_name_dst = destination->getCname();
252 /* update net_elm with that of the destination physical host */
253 piface_->pimpl_netpoint = destination->pimpl_netpoint;
255 hostPM_ = destination;
257 /* Update vcpu's action for the new pm */
258 /* create a cpu action bound to the pm model at the destination. */
259 surf::CpuAction* new_cpu_action =
260 static_cast<surf::CpuAction*>(destination->pimpl_cpu->execution_start(0, this->coreAmount_));
262 if (action_->getRemainsNoUpdate() > 0)
263 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->getRemainsNoUpdate());
265 /* keep the bound value of the cpu action of the VM. */
266 double old_bound = action_->getBound();
268 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
269 new_cpu_action->setBound(old_bound);
272 XBT_ATTRIB_UNUSED int ret = action_->unref();
273 xbt_assert(ret == 1, "Bug: some resource still remains");
275 action_ = new_cpu_action;
277 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
280 void VirtualMachineImpl::setBound(double bound)
282 action_->setBound(bound);