1 /* Copyright (c) 2013-2017. 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/plugins/vm/VirtualMachineImpl.hpp"
8 #include "src/simix/ActorImpl.hpp"
9 #include "src/simix/smx_host_private.h"
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_vm, surf, "Logging specific to the SURF VM module");
13 simgrid::vm::VMModel* surf_vm_model = nullptr;
15 void surf_vm_model_init_HL13()
17 if (surf_cpu_model_vm) {
18 surf_vm_model = new simgrid::vm::VMModel();
19 all_existing_models->push_back(surf_vm_model);
30 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> onVmCreation;
31 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> onVmDestruction;
32 simgrid::xbt::signal<void(simgrid::vm::VirtualMachineImpl*)> onVmStateChange;
38 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
40 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
41 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
42 * FIXME: add a configuration flag for this
44 const double virt_overhead = 1; // 0.95
46 static void hostStateChange(s4u::Host& host)
48 if (host.isOff()) { // just turned off.
49 std::vector<s4u::VirtualMachine*> trash;
50 /* Find all VMs living on that host */
51 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
52 if (vm->getPm() == &host)
54 for (s4u::VirtualMachine* vm : trash)
55 vm->pimpl_vm_->shutdown(SIMIX_process_self());
60 s4u::Host::onStateChange.connect(hostStateChange);
63 double VMModel::nextOccuringEvent(double now)
65 /* TODO: update action's cost with the total cost of processes on the VM. */
67 /* 1. Now we know how many resource should be assigned to each virtual
68 * machine. We update constraints of the virtual machine layer.
70 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
71 * X1 + X2 = C (Equation 1)
73 * the resource share of VM1: X1
74 * the resource share of VM2: X2
75 * the capacity of PM1: C
77 * Then, if we have two process (P1 and P2) on VM1.
78 * X1_1 + X1_2 = X1 (Equation 2)
80 * the resource share of P1: X1_1
81 * the resource share of P2: X1_2
82 * the capacity of VM1: X1
84 * Equation 1 was solved in the physical machine layer.
85 * Equation 2 is solved in the virtual machine layer (here).
86 * X1 must be passed to the virtual machine layer as a constraint value.
89 /* iterate for all virtual machines */
90 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
91 surf::Cpu* cpu = ws_vm->pimpl_cpu;
92 xbt_assert(cpu, "cpu-less host");
94 double solved_value = ws_vm->pimpl_vm_->action_->getVariable()
95 ->value; // this is X1 in comment above, what this VM got in the sharing on the PM
96 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->getCname(), ws_vm->pimpl_vm_->getPm()->getCname());
98 // TODO: check lmm_update_constraint_bound() works fine instead of the below manual substitution.
99 // cpu_cas01->constraint->bound = solved_value;
100 xbt_assert(cpu->model() == surf_cpu_model_vm);
101 lmm_system_t vcpu_system = cpu->model()->getMaxminSystem();
102 lmm_update_constraint_bound(vcpu_system, cpu->constraint(), virt_overhead * solved_value);
105 /* 2. Calculate resource share at the virtual machine layer. */
106 ignoreEmptyVmInPmLMM();
108 /* 3. Ready. Get the next occurring event */
109 return surf_cpu_model_vm->nextOccuringEvent(now);
116 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::VirtualMachine* piface, simgrid::s4u::Host* host_PM,
118 : HostImpl(piface), hostPM_(host_PM), coreAmount_(coreAmount)
120 /* Register this VM to the list of all VMs */
121 allVms_.push_back(piface);
123 /* We create cpu_action corresponding to a VM process on the host operating system. */
124 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
125 action_ = host_PM->pimpl_cpu->execution_start(0, coreAmount);
127 /* Initialize the VM parameters */
130 XBT_VERB("Create VM(%s)@PM(%s)", piface->getCname(), hostPM_->getCname());
134 xbt_log_no_loc; /* ugly pimpl to ensure that the debug info in the known issue below don't break the test */
135 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
136 VirtualMachineImpl::~VirtualMachineImpl()
138 onVmDestruction(this);
139 /* I was already removed from the allVms set if the VM was destroyed cleanly */
140 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
141 if (iter != allVms_.end())
144 /* dirty page tracking */
145 unsigned int size = dp_objs.size();
146 static bool already_warned = false;
147 if (size > 0 && not already_warned) {
148 auto front = dp_objs.begin();
149 XBT_WARN("Dirty page tracking: %u pending task(s) on a destroyed VM (first one is %s).\n"
150 "If you don't understand why your task was not properly removed, please report that bug.\n"
151 "This is a known bug if you turned the host off during the VM execution.\n"
152 "Please remind us of that problem at some point: our code base is not ready to fix this harmless issue in "
154 size, (xbt_log_no_loc ? "(name hidden)" : front->first.c_str()));
155 already_warned = true;
158 /* Free the cpu_action of the VM. */
159 XBT_ATTRIB_UNUSED int ret = action_->unref();
160 xbt_assert(ret == 1, "Bug: some resource still remains");
163 e_surf_vm_state_t VirtualMachineImpl::getState()
168 void VirtualMachineImpl::setState(e_surf_vm_state_t state)
172 void VirtualMachineImpl::suspend(smx_actor_t issuer)
175 THROWF(vm_error, 0, "Cannot suspend VM '%s': it is migrating", piface_->getCname());
176 if (getState() != SURF_VM_STATE_RUNNING)
177 THROWF(vm_error, 0, "Cannot suspend VM %s: it is not running.", piface_->getCname());
178 if (issuer->host == piface_)
179 THROWF(vm_error, 0, "Actor %s cannot suspend the VM %s in which it runs", issuer->cname(), piface_->getCname());
181 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
182 XBT_DEBUG("suspend VM(%s), where %d processes exist", piface_->getCname(), xbt_swag_size(process_list));
186 smx_actor_t smx_process;
187 smx_actor_t smx_process_safe;
188 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
189 XBT_DEBUG("suspend %s", smx_process->name.c_str());
190 smx_process->suspend(issuer);
193 XBT_DEBUG("suspend all processes on the VM done done");
195 vmState_ = SURF_VM_STATE_SUSPENDED;
198 void VirtualMachineImpl::resume()
200 if (getState() != SURF_VM_STATE_SUSPENDED)
201 THROWF(vm_error, 0, "Cannot resume VM %s: it was not suspended", piface_->getCname());
203 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
204 XBT_DEBUG("Resume VM %s, containing %d processes.", piface_->getCname(), xbt_swag_size(process_list));
208 smx_actor_t smx_process;
209 smx_actor_t smx_process_safe;
210 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
211 XBT_DEBUG("resume %s", smx_process->cname());
212 smx_process->resume();
215 vmState_ = SURF_VM_STATE_RUNNING;
218 /** @brief Power off a VM.
220 * All hosted processes will be killed, but the VM state is preserved on memory.
221 * It can later be restarted.
223 * @param issuer the actor requesting the shutdown
225 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
227 if (getState() != SURF_VM_STATE_RUNNING) {
228 const char* stateName = "(unknown state)";
229 switch (getState()) {
230 case SURF_VM_STATE_CREATED:
231 stateName = "created, but not yet started";
233 case SURF_VM_STATE_SUSPENDED:
234 stateName = "suspended";
236 case SURF_VM_STATE_DESTROYED:
237 stateName = "destroyed";
239 default: /* SURF_VM_STATE_RUNNING or unexpected values */
243 XBT_VERB("Shutting down the VM %s even if it's not running but %s", piface_->getCname(), stateName);
246 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
247 XBT_DEBUG("shutdown VM %s, that contains %d processes", piface_->getCname(), xbt_swag_size(process_list));
249 smx_actor_t smx_process;
250 smx_actor_t smx_process_safe;
251 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
252 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", smx_process->cname(), smx_process->host->getCname(),
254 SIMIX_process_kill(smx_process, issuer);
257 setState(SURF_VM_STATE_DESTROYED);
259 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
262 /** @brief returns the physical machine on which the VM is running **/
263 s4u::Host* VirtualMachineImpl::getPm()
268 /** @brief Change the physical host on which the given VM is running
270 * This is an instantaneous migration.
272 void VirtualMachineImpl::setPm(s4u::Host* destination)
274 const char* vm_name = piface_->getCname();
275 const char* pm_name_src = hostPM_->getCname();
276 const char* pm_name_dst = destination->getCname();
278 /* update net_elm with that of the destination physical host */
279 piface_->pimpl_netpoint = destination->pimpl_netpoint;
281 hostPM_ = destination;
283 /* Update vcpu's action for the new pm */
284 /* create a cpu action bound to the pm model at the destination. */
285 surf::CpuAction* new_cpu_action =
286 static_cast<surf::CpuAction*>(destination->pimpl_cpu->execution_start(0, this->coreAmount_));
288 if (action_->getRemainsNoUpdate() > 0)
289 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->getRemainsNoUpdate());
291 /* keep the bound value of the cpu action of the VM. */
292 double old_bound = action_->getBound();
294 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
295 new_cpu_action->setBound(old_bound);
298 XBT_ATTRIB_UNUSED int ret = action_->unref();
299 xbt_assert(ret == 1, "Bug: some resource still remains");
301 action_ = new_cpu_action;
303 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
306 sg_size_t VirtualMachineImpl::getRamsize()
308 return params_.ramsize;
311 void VirtualMachineImpl::setBound(double bound)
313 action_->setBound(bound);
316 void VirtualMachineImpl::getParams(vm_params_t params)
321 void VirtualMachineImpl::setParams(vm_params_t params)
323 /* may check something here. */