1 /* Copyright (c) 2013-2019. 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/include/surf/surf.hpp"
8 #include "src/simix/ActorImpl.hpp"
9 #include "src/simix/smx_host_private.hpp"
10 #include "src/kernel/activity/ExecImpl.hpp"
11 #include "xbt/asserts.h" // xbt_log_no_loc
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_vm, surf, "Logging specific to the SURF VM module");
15 simgrid::vm::VMModel* surf_vm_model = nullptr;
17 void surf_vm_model_init_HL13()
19 if (surf_cpu_model_vm != nullptr)
20 surf_vm_model = new simgrid::vm::VMModel();
28 simgrid::xbt::signal<void(VirtualMachineImpl*)> VirtualMachineImpl::on_creation;
29 simgrid::xbt::signal<void(VirtualMachineImpl*)> VirtualMachineImpl::on_destruction;
30 simgrid::xbt::signal<void(VirtualMachineImpl*)> VirtualMachineImpl::on_state_change;
35 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
37 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
38 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
39 * FIXME: add a configuration flag for this
41 const double virt_overhead = 1; // 0.95
43 static void hostStateChange(s4u::Host& host)
45 if (host.is_off()) { // just turned off.
46 std::vector<s4u::VirtualMachine*> trash;
47 /* Find all VMs living on that host */
48 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
49 if (vm->get_pm() == &host)
51 for (s4u::VirtualMachine* vm : trash)
56 static void addActiveTask(kernel::activity::ExecImplPtr exec)
58 s4u::VirtualMachine *vm = dynamic_cast<s4u::VirtualMachine*>(exec->host_);
60 VirtualMachineImpl *vm_impl = vm->get_impl();
61 vm_impl->active_tasks_ = vm_impl->active_tasks_ + 1;
62 vm_impl->update_action_weight();
66 static void removeActiveTask(kernel::activity::ExecImplPtr exec)
68 s4u::VirtualMachine *vm = dynamic_cast<s4u::VirtualMachine*>(exec->host_);
70 VirtualMachineImpl *vm_impl = vm->get_impl();
71 vm_impl->active_tasks_ = vm_impl->active_tasks_ - 1;
72 vm_impl->update_action_weight();
78 all_existing_models.push_back(this);
79 s4u::Host::on_state_change.connect(hostStateChange);
80 kernel::activity::ExecImpl::on_creation.connect(addActiveTask);
81 kernel::activity::ExecImpl::on_completion.connect(removeActiveTask);
82 kernel::activity::ExecImpl::on_resumed.connect(addActiveTask);
83 kernel::activity::ExecImpl::on_suspended.connect(removeActiveTask);
86 double VMModel::next_occuring_event(double now)
88 /* TODO: update action's cost with the total cost of processes on the VM. */
90 /* 1. Now we know how many resource should be assigned to each virtual
91 * machine. We update constraints of the virtual machine layer.
93 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
94 * X1 + X2 = C (Equation 1)
96 * the resource share of VM1: X1
97 * the resource share of VM2: X2
98 * the capacity of PM1: C
100 * Then, if we have two process (P1 and P2) on VM1.
101 * X1_1 + X1_2 = X1 (Equation 2)
103 * the resource share of P1: X1_1
104 * the resource share of P2: X1_2
105 * the capacity of VM1: X1
107 * Equation 1 was solved in the physical machine layer.
108 * Equation 2 is solved in the virtual machine layer (here).
109 * X1 must be passed to the virtual machine layer as a constraint value.
112 /* iterate for all virtual machines */
113 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
114 surf::Cpu* cpu = ws_vm->pimpl_cpu;
116 double solved_value =
117 ws_vm->get_impl()->action_->get_variable()->get_value(); // this is X1 in comment above, what
118 // this VM got in the sharing on the PM
119 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->get_cname(), ws_vm->get_pm()->get_cname());
121 xbt_assert(cpu->get_model() == surf_cpu_model_vm);
122 kernel::lmm::System* vcpu_system = cpu->get_model()->get_maxmin_system();
123 vcpu_system->update_constraint_bound(cpu->get_constraint(), virt_overhead * solved_value);
126 /* 2. Ready. Get the next occurring event */
127 return surf_cpu_model_vm->next_occuring_event(now);
134 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::VirtualMachine* piface, simgrid::s4u::Host* host_PM,
135 int core_amount, size_t ramsize)
136 : HostImpl(piface), physical_host_(host_PM), core_amount_(core_amount), user_bound_(std::numeric_limits<double>::max()), ramsize_(ramsize)
138 /* Register this VM to the list of all VMs */
139 allVms_.push_back(piface);
141 /* We create cpu_action corresponding to a VM process on the host operating system. */
142 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
143 action_ = host_PM->pimpl_cpu->execution_start(0, core_amount);
145 // It's empty for now, so it should not request resources in the PM
146 update_action_weight();
148 XBT_VERB("Create VM(%s)@PM(%s)", piface->get_cname(), physical_host_->get_cname());
152 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
153 VirtualMachineImpl::~VirtualMachineImpl()
155 on_destruction(this);
156 /* I was already removed from the allVms set if the VM was destroyed cleanly */
157 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
158 if (iter != allVms_.end())
161 /* Free the cpu_action of the VM. */
162 XBT_ATTRIB_UNUSED bool ret = action_->unref();
163 xbt_assert(ret, "Bug: some resource still remains");
166 void VirtualMachineImpl::suspend(smx_actor_t issuer)
168 if (get_state() != s4u::VirtualMachine::state::RUNNING)
169 THROWF(vm_error, 0, "Cannot suspend VM %s: it is not running.", piface_->get_cname());
170 if (issuer->host_ == piface_)
171 THROWF(vm_error, 0, "Actor %s cannot suspend the VM %s in which it runs", issuer->get_cname(),
172 piface_->get_cname());
174 XBT_DEBUG("suspend VM(%s), where %zu processes exist", piface_->get_cname(), process_list_.size());
178 for (auto& smx_process : process_list_) {
179 XBT_DEBUG("suspend %s", smx_process.get_cname());
180 smx_process.suspend(issuer);
183 XBT_DEBUG("suspend all processes on the VM done done");
185 vm_state_ = s4u::VirtualMachine::state::SUSPENDED;
188 void VirtualMachineImpl::resume()
190 if (get_state() != s4u::VirtualMachine::state::SUSPENDED)
191 THROWF(vm_error, 0, "Cannot resume VM %s: it was not suspended", piface_->get_cname());
193 XBT_DEBUG("Resume VM %s, containing %zu processes.", piface_->get_cname(), process_list_.size());
197 for (auto& smx_process : process_list_) {
198 XBT_DEBUG("resume %s", smx_process.get_cname());
199 smx_process.resume();
202 vm_state_ = s4u::VirtualMachine::state::RUNNING;
205 /** @brief Power off a VM.
207 * All hosted processes will be killed, but the VM state is preserved on memory.
208 * It can later be restarted.
210 * @param issuer the actor requesting the shutdown
212 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
214 if (get_state() != s4u::VirtualMachine::state::RUNNING) {
215 const char* stateName = "(unknown state)";
216 switch (get_state()) {
217 case s4u::VirtualMachine::state::CREATED:
218 stateName = "created, but not yet started";
220 case s4u::VirtualMachine::state::SUSPENDED:
221 stateName = "suspended";
223 case s4u::VirtualMachine::state::DESTROYED:
224 stateName = "destroyed";
226 default: /* SURF_VM_STATE_RUNNING or unexpected values */
230 XBT_VERB("Shutting down the VM %s even if it's not running but %s", piface_->get_cname(), stateName);
233 XBT_DEBUG("shutdown VM %s, that contains %zu processes", piface_->get_cname(), process_list_.size());
235 for (auto& smx_process : process_list_) {
236 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", smx_process.get_cname(),
237 smx_process.host_->get_cname(), issuer->get_cname());
238 SIMIX_process_kill(&smx_process, issuer);
241 set_state(s4u::VirtualMachine::state::DESTROYED);
243 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
246 /** @brief Change the physical host on which the given VM is running
248 * This is an instantaneous migration.
250 void VirtualMachineImpl::set_physical_host(s4u::Host* destination)
252 std::string vm_name = piface_->get_name();
253 std::string pm_name_src = physical_host_->get_name();
254 std::string pm_name_dst = destination->get_name();
256 /* update net_elm with that of the destination physical host */
257 piface_->pimpl_netpoint = destination->pimpl_netpoint;
259 physical_host_ = destination;
261 /* Update vcpu's action for the new pm */
262 /* create a cpu action bound to the pm model at the destination. */
263 surf::CpuAction* new_cpu_action =
264 static_cast<surf::CpuAction*>(destination->pimpl_cpu->execution_start(0, this->core_amount_));
266 if (action_->get_remains_no_update() > 0)
267 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->get_remains_no_update());
269 /* keep the bound value of the cpu action of the VM. */
270 double old_bound = action_->get_bound();
272 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name.c_str(), old_bound, pm_name_dst.c_str());
273 new_cpu_action->set_bound(old_bound);
276 XBT_ATTRIB_UNUSED bool ret = action_->unref();
277 xbt_assert(ret, "Bug: some resource still remains");
279 action_ = new_cpu_action;
281 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name.c_str(), pm_name_src.c_str(), pm_name_dst.c_str());
284 void VirtualMachineImpl::set_bound(double bound)
287 update_action_weight();
290 void VirtualMachineImpl::update_action_weight(){
291 /* The impact of the VM over its PM is the min between its vCPU amount and the amount of tasks it contains */
292 int impact = std::min(active_tasks_, get_core_amount());
294 XBT_DEBUG("set the weight of the dummy CPU action of VM%p on PM to %d (#tasks: %d)", this, impact, active_tasks_);
297 action_->set_priority(1. / impact);
299 action_->set_priority(0.);
301 action_->set_bound(std::min(impact * physical_host_->get_speed(), user_bound_));