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(VirtualMachineImpl*)> VirtualMachineImpl::on_creation;
30 simgrid::xbt::signal<void(VirtualMachineImpl*)> VirtualMachineImpl::on_destruction;
31 simgrid::xbt::signal<void(VirtualMachineImpl*)> VirtualMachineImpl::on_state_change;
36 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
38 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
39 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
40 * FIXME: add a configuration flag for this
42 const double virt_overhead = 1; // 0.95
44 static void hostStateChange(s4u::Host& host)
46 if (host.is_off()) { // just turned off.
47 std::vector<s4u::VirtualMachine*> trash;
48 /* Find all VMs living on that host */
49 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
50 if (vm->get_pm() == &host)
52 for (s4u::VirtualMachine* vm : trash)
59 s4u::Host::on_state_change.connect(hostStateChange);
62 double VMModel::next_occuring_event(double now)
64 /* TODO: update action's cost with the total cost of processes on the VM. */
66 /* 1. Now we know how many resource should be assigned to each virtual
67 * machine. We update constraints of the virtual machine layer.
69 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
70 * X1 + X2 = C (Equation 1)
72 * the resource share of VM1: X1
73 * the resource share of VM2: X2
74 * the capacity of PM1: C
76 * Then, if we have two process (P1 and P2) on VM1.
77 * X1_1 + X1_2 = X1 (Equation 2)
79 * the resource share of P1: X1_1
80 * the resource share of P2: X1_2
81 * the capacity of VM1: X1
83 * Equation 1 was solved in the physical machine layer.
84 * Equation 2 is solved in the virtual machine layer (here).
85 * X1 must be passed to the virtual machine layer as a constraint value.
88 /* iterate for all virtual machines */
89 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
90 surf::Cpu* cpu = ws_vm->pimpl_cpu;
93 ws_vm->get_impl()->action_->get_variable()->get_value(); // this is X1 in comment above, what
94 // this VM got in the sharing on the PM
95 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->get_cname(), ws_vm->get_pm()->get_cname());
97 xbt_assert(cpu->get_model() == surf_cpu_model_vm);
98 kernel::lmm::System* vcpu_system = cpu->get_model()->get_maxmin_system();
99 vcpu_system->update_constraint_bound(cpu->get_constraint(), virt_overhead * solved_value);
102 /* 2. Calculate resource share at the virtual machine layer. */
103 ignore_empty_vm_in_pm_LMM();
105 /* 3. Ready. Get the next occurring event */
106 return surf_cpu_model_vm->next_occuring_event(now);
113 VirtualMachineImpl::VirtualMachineImpl(simgrid::s4u::VirtualMachine* piface, simgrid::s4u::Host* host_PM,
114 int core_amount, size_t ramsize)
115 : HostImpl(piface), physical_host_(host_PM), core_amount_(core_amount), ramsize_(ramsize)
117 /* Register this VM to the list of all VMs */
118 allVms_.push_back(piface);
120 /* We create cpu_action corresponding to a VM process on the host operating system. */
121 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ? */
122 action_ = host_PM->pimpl_cpu->execution_start(0, core_amount);
124 XBT_VERB("Create VM(%s)@PM(%s)", piface->get_cname(), physical_host_->get_cname());
128 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
129 VirtualMachineImpl::~VirtualMachineImpl()
131 on_destruction(this);
132 /* I was already removed from the allVms set if the VM was destroyed cleanly */
133 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
134 if (iter != allVms_.end())
137 /* Free the cpu_action of the VM. */
138 XBT_ATTRIB_UNUSED bool ret = action_->unref();
139 xbt_assert(ret, "Bug: some resource still remains");
142 void VirtualMachineImpl::suspend(smx_actor_t issuer)
144 if (get_state() != s4u::VirtualMachine::state::RUNNING)
145 THROWF(vm_error, 0, "Cannot suspend VM %s: it is not running.", piface_->get_cname());
146 if (issuer->host == piface_)
147 THROWF(vm_error, 0, "Actor %s cannot suspend the VM %s in which it runs", issuer->get_cname(),
148 piface_->get_cname());
150 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
151 XBT_DEBUG("suspend VM(%s), where %zu processes exist", piface_->get_cname(), process_list.size());
155 for (auto& smx_process : process_list) {
156 XBT_DEBUG("suspend %s", smx_process.name.c_str());
157 smx_process.suspend(issuer);
160 XBT_DEBUG("suspend all processes on the VM done done");
162 vm_state_ = s4u::VirtualMachine::state::SUSPENDED;
165 void VirtualMachineImpl::resume()
167 if (get_state() != s4u::VirtualMachine::state::SUSPENDED)
168 THROWF(vm_error, 0, "Cannot resume VM %s: it was not suspended", piface_->get_cname());
170 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
171 XBT_DEBUG("Resume VM %s, containing %zu processes.", piface_->get_cname(), process_list.size());
175 for (auto& smx_process : process_list) {
176 XBT_DEBUG("resume %s", smx_process.get_cname());
177 smx_process.resume();
180 vm_state_ = s4u::VirtualMachine::state::RUNNING;
183 /** @brief Power off a VM.
185 * All hosted processes will be killed, but the VM state is preserved on memory.
186 * It can later be restarted.
188 * @param issuer the actor requesting the shutdown
190 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
192 if (get_state() != s4u::VirtualMachine::state::RUNNING) {
193 const char* stateName = "(unknown state)";
194 switch (get_state()) {
195 case s4u::VirtualMachine::state::CREATED:
196 stateName = "created, but not yet started";
198 case s4u::VirtualMachine::state::SUSPENDED:
199 stateName = "suspended";
201 case s4u::VirtualMachine::state::DESTROYED:
202 stateName = "destroyed";
204 default: /* SURF_VM_STATE_RUNNING or unexpected values */
208 XBT_VERB("Shutting down the VM %s even if it's not running but %s", piface_->get_cname(), stateName);
211 auto& process_list = piface_->extension<simgrid::simix::Host>()->process_list;
212 XBT_DEBUG("shutdown VM %s, that contains %zu processes", piface_->get_cname(), process_list.size());
214 for (auto& smx_process : process_list) {
215 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", smx_process.get_cname(),
216 smx_process.host->get_cname(), issuer->get_cname());
217 SIMIX_process_kill(&smx_process, issuer);
220 set_state(s4u::VirtualMachine::state::DESTROYED);
222 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
225 /** @brief Change the physical host on which the given VM is running
227 * This is an instantaneous migration.
229 void VirtualMachineImpl::set_physical_host(s4u::Host* destination)
231 const char* vm_name = piface_->get_cname();
232 const char* pm_name_src = physical_host_->get_cname();
233 const char* pm_name_dst = destination->get_cname();
235 /* update net_elm with that of the destination physical host */
236 piface_->pimpl_netpoint = destination->pimpl_netpoint;
238 physical_host_ = destination;
240 /* Update vcpu's action for the new pm */
241 /* create a cpu action bound to the pm model at the destination. */
242 surf::CpuAction* new_cpu_action =
243 static_cast<surf::CpuAction*>(destination->pimpl_cpu->execution_start(0, this->core_amount_));
245 if (action_->get_remains_no_update() > 0)
246 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->get_remains_no_update());
248 /* keep the bound value of the cpu action of the VM. */
249 double old_bound = action_->get_bound();
251 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name, old_bound, pm_name_dst);
252 new_cpu_action->set_bound(old_bound);
255 XBT_ATTRIB_UNUSED bool ret = action_->unref();
256 xbt_assert(ret, "Bug: some resource still remains");
258 action_ = new_cpu_action;
260 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name, pm_name_src, pm_name_dst);
263 void VirtualMachineImpl::set_bound(double bound)
265 action_->set_bound(bound);