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/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 = 0.95;
45 const double virt_overhead = 1;
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)
56 vm->pimpl_vm_->shutdown(SIMIX_process_self());
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->pimpl_vm_->action_->getVariable()
96 ->value; // this is X1 in comment above, what 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->pimpl_vm_->getPm()->getCname());
99 // TODO: check lmm_update_constraint_bound() works fine instead of the below manual substitution.
100 // cpu_cas01->constraint->bound = solved_value;
101 xbt_assert(cpu->model() == surf_cpu_model_vm);
102 lmm_system_t vcpu_system = cpu->model()->getMaxminSystem();
103 lmm_update_constraint_bound(vcpu_system, cpu->constraint(), virt_overhead * solved_value);
106 /* 2. Calculate resource share at the virtual machine layer. */
107 ignoreEmptyVmInPmLMM();
109 /* 3. Ready. Get the next occurring event */
110 return surf_cpu_model_vm->nextOccuringEvent(now);
117 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::VirtualMachine* piface, simgrid::s4u::Host* host_PM,
119 : HostImpl(piface), hostPM_(host_PM), coreAmount_(coreAmount)
121 /* Register this VM to the list of all VMs */
122 allVms_.push_back(piface);
124 /* We create cpu_action corresponding to a VM process on the host operating system. */
125 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
126 action_ = host_PM->pimpl_cpu->execution_start(0, coreAmount);
128 /* Initialize the VM parameters */
131 XBT_VERB("Create VM(%s)@PM(%s)", piface->getCname(), hostPM_->getCname());
135 xbt_log_no_loc; /* ugly pimpl to ensure that the debug info in the known issue below don't break the test */
136 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
137 VirtualMachineImpl::~VirtualMachineImpl()
139 onVmDestruction(this);
140 /* I was already removed from the allVms set if the VM was destroyed cleanly */
141 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
142 if (iter != allVms_.end())
145 /* dirty page tracking */
146 unsigned int size = dp_objs.size();
147 static bool already_warned = false;
148 if (size > 0 && not already_warned) {
149 auto front = dp_objs.begin();
150 XBT_WARN("Dirty page tracking: %u pending task(s) on a destroyed VM (first one is %s).\n"
151 "If you don't understand why your task was not properly removed, please report that bug.\n"
152 "This is a known bug if you turned the host off during the VM execution.\n"
153 "Please remind us of that problem at some point: our code base is not ready to fix this harmless issue in "
155 size, (xbt_log_no_loc ? "(name hidden)" : front->first.c_str()));
156 already_warned = true;
159 /* Free the cpu_action of the VM. */
160 XBT_ATTRIB_UNUSED int ret = action_->unref();
161 xbt_assert(ret == 1, "Bug: some resource still remains");
164 e_surf_vm_state_t VirtualMachineImpl::getState()
169 void VirtualMachineImpl::setState(e_surf_vm_state_t state)
173 void VirtualMachineImpl::suspend(smx_actor_t issuer)
176 THROWF(vm_error, 0, "Cannot suspend VM '%s': it is migrating", piface_->getCname());
177 if (getState() != SURF_VM_STATE_RUNNING)
178 THROWF(vm_error, 0, "Cannot suspend VM %s: it is not running.", piface_->getCname());
179 if (issuer->host == piface_)
180 THROWF(vm_error, 0, "Actor %s cannot suspend the VM %s in which it runs", issuer->cname(), piface_->getCname());
182 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
183 XBT_DEBUG("suspend VM(%s), where %d processes exist", piface_->getCname(), xbt_swag_size(process_list));
187 smx_actor_t smx_process;
188 smx_actor_t smx_process_safe;
189 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
190 XBT_DEBUG("suspend %s", smx_process->name.c_str());
191 smx_process->suspend(issuer);
194 XBT_DEBUG("suspend all processes on the VM done done");
196 vmState_ = SURF_VM_STATE_SUSPENDED;
199 void VirtualMachineImpl::resume()
201 if (getState() != SURF_VM_STATE_SUSPENDED)
202 THROWF(vm_error, 0, "Cannot resume VM %s: it was not suspended", piface_->getCname());
204 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
205 XBT_DEBUG("Resume VM %s, containing %d processes.", piface_->getCname(), xbt_swag_size(process_list));
209 smx_actor_t smx_process;
210 smx_actor_t smx_process_safe;
211 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
212 XBT_DEBUG("resume %s", smx_process->cname());
213 smx_process->resume();
216 vmState_ = SURF_VM_STATE_RUNNING;
219 /** @brief Power off a VM.
221 * All hosted processes will be killed, but the VM state is preserved on memory.
222 * It can later be restarted.
224 * @param issuer the actor requesting the shutdown
226 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
228 if (getState() != SURF_VM_STATE_RUNNING) {
229 const char* stateName = "(unknown state)";
230 switch (getState()) {
231 case SURF_VM_STATE_CREATED:
232 stateName = "created, but not yet started";
234 case SURF_VM_STATE_SUSPENDED:
235 stateName = "suspended";
237 case SURF_VM_STATE_DESTROYED:
238 stateName = "destroyed";
240 default: /* SURF_VM_STATE_RUNNING or unexpected values */
244 XBT_VERB("Shutting down the VM %s even if it's not running but %s", piface_->getCname(), stateName);
247 xbt_swag_t process_list = piface_->extension<simgrid::simix::Host>()->process_list;
248 XBT_DEBUG("shutdown VM %s, that contains %d processes", piface_->getCname(), xbt_swag_size(process_list));
250 smx_actor_t smx_process;
251 smx_actor_t smx_process_safe;
252 xbt_swag_foreach_safe(smx_process, smx_process_safe, process_list) {
253 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", smx_process->cname(), smx_process->host->getCname(),
255 SIMIX_process_kill(smx_process, issuer);
258 setState(SURF_VM_STATE_DESTROYED);
260 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
263 /** @brief returns the physical machine on which the VM is running **/
264 s4u::Host* VirtualMachineImpl::getPm()
269 /** @brief Change the physical host on which the given VM is running
271 * This is an instantaneous migration.
273 void VirtualMachineImpl::setPm(s4u::Host* destination)
275 const char* vm_name = piface_->getCname();
276 const char* pm_name_src = hostPM_->getCname();
277 const char* pm_name_dst = destination->getCname();
279 /* update net_elm with that of the destination physical host */
280 piface_->pimpl_netpoint = destination->pimpl_netpoint;
282 hostPM_ = destination;
284 /* Update vcpu's action for the new pm */
285 /* create a cpu action bound to the pm model at the destination. */
286 surf::CpuAction* new_cpu_action =
287 static_cast<surf::CpuAction*>(destination->pimpl_cpu->execution_start(0, this->coreAmount_));
289 if (action_->getRemainsNoUpdate() > 0)
290 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->getRemainsNoUpdate());
292 /* keep the bound value of the cpu action of the VM. */
293 double old_bound = action_->getBound();
295 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
296 new_cpu_action->setBound(old_bound);
299 XBT_ATTRIB_UNUSED int ret = action_->unref();
300 xbt_assert(ret == 1, "Bug: some resource still remains");
302 action_ = new_cpu_action;
304 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
307 sg_size_t VirtualMachineImpl::getRamsize()
309 return params_.ramsize;
312 void VirtualMachineImpl::setBound(double bound)
314 action_->setBound(bound);
317 void VirtualMachineImpl::getParams(vm_params_t params)
322 void VirtualMachineImpl::setParams(vm_params_t params)
324 /* may check something here. */