1 /* Copyright (c) 2015-2017. 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 "simgrid/s4u/Actor.hpp"
7 #include "src/instr/instr_private.hpp"
8 #include "src/plugins/vm/VirtualMachineImpl.hpp"
9 #include "src/plugins/vm/VmHostExt.hpp"
10 #include "src/simix/smx_host_private.hpp"
11 #include "src/surf/cpu_cas01.hpp"
12 #include <src/plugins/vm/VmLiveMigration.hpp>
14 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_vm, "S4U virtual machines");
19 VirtualMachine::VirtualMachine(const char* name, s4u::Host* pm, int coreAmount)
20 : VirtualMachine(name, pm, coreAmount, 0)
24 VirtualMachine::VirtualMachine(const char* name, s4u::Host* pm, int coreAmount, size_t ramsize)
25 : Host(name), pimpl_vm_(new vm::VirtualMachineImpl(this, pm, coreAmount, ramsize))
27 XBT_DEBUG("Create VM %s", name);
29 /* Currently, a VM uses the network resource of its physical host */
30 pimpl_netpoint = pm->pimpl_netpoint;
31 // Create a VCPU for this VM
32 surf::CpuCas01* sub_cpu = dynamic_cast<surf::CpuCas01*>(pm->pimpl_cpu);
34 pimpl_cpu = surf_cpu_model_vm->createCpu(this, sub_cpu->getSpeedPeakList(), coreAmount);
35 if (sub_cpu->getPState() != 0)
36 pimpl_cpu->setPState(sub_cpu->getPState());
38 /* Make a process container */
39 extension_set<simgrid::simix::Host>(new simgrid::simix::Host());
41 if (TRACE_msg_vm_is_enabled()) {
42 container_t host_container = simgrid::instr::Container::byName(pm->getName());
43 new simgrid::instr::Container(name, "MSG_VM", host_container);
47 VirtualMachine::~VirtualMachine()
51 XBT_DEBUG("destroy %s", getCname());
53 /* FIXME: this is really strange that everything fails if the next line is removed.
54 * This is as if we shared these data with the PM, which definitely should not be the case...
56 * We need to test that suspending a VM does not suspends the processes running on its PM, for example.
57 * Or we need to simplify this code enough to make it actually readable (but this sounds harder than testing)
59 extension_set<simgrid::simix::Host>(nullptr);
61 /* Don't free these things twice: they are the ones of my physical host */
62 pimpl_netpoint = nullptr;
65 void VirtualMachine::start()
67 simgrid::simix::kernelImmediate([this]() {
68 simgrid::vm::VmHostExt::ensureVmExtInstalled();
70 simgrid::s4u::Host* pm = this->pimpl_vm_->getPm();
71 if (pm->extension<simgrid::vm::VmHostExt>() == nullptr)
72 pm->extension_set(new simgrid::vm::VmHostExt());
74 long pm_ramsize = pm->extension<simgrid::vm::VmHostExt>()->ramsize;
75 int pm_overcommit = pm->extension<simgrid::vm::VmHostExt>()->overcommit;
76 long vm_ramsize = this->getRamsize();
78 if (pm_ramsize && not pm_overcommit) { /* Only verify that we don't overcommit on need */
79 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
80 long total_ramsize_of_vms = 0;
81 for (simgrid::s4u::VirtualMachine* const& ws_vm : simgrid::vm::VirtualMachineImpl::allVms_)
82 if (pm == ws_vm->pimpl_vm_->getPm())
83 total_ramsize_of_vms += ws_vm->pimpl_vm_->getRamsize();
85 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
86 XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
87 this->getCname(), pm->getCname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
88 THROWF(vm_error, 0, "Memory shortage on host '%s', VM '%s' cannot be started", pm->getCname(),
93 this->pimpl_vm_->setState(SURF_VM_STATE_RUNNING);
97 void VirtualMachine::suspend()
99 smx_actor_t issuer = SIMIX_process_self();
100 simgrid::simix::kernelImmediate([this, issuer]() { pimpl_vm_->suspend(issuer); });
101 XBT_DEBUG("vm_suspend done");
104 void VirtualMachine::resume()
109 void VirtualMachine::shutdown()
111 smx_actor_t issuer = SIMIX_process_self();
112 simgrid::simix::kernelImmediate([this, issuer]() { pimpl_vm_->shutdown(issuer); });
115 bool VirtualMachine::isMigrating()
117 return pimpl_vm_ && pimpl_vm_->isMigrating;
120 simgrid::s4u::Host* VirtualMachine::getPm()
122 return pimpl_vm_->getPm();
125 void VirtualMachine::setPm(simgrid::s4u::Host* pm)
127 simgrid::simix::kernelImmediate([this, pm]() { pimpl_vm_->setPm(pm); });
130 e_surf_vm_state_t VirtualMachine::getState()
132 return pimpl_vm_->getState();
135 size_t VirtualMachine::getRamsize()
137 return pimpl_vm_->getRamsize();
140 void VirtualMachine::setRamsize(size_t ramsize)
142 pimpl_vm_->setRamsize(ramsize);
144 /** @brief Set a CPU bound for a given VM.
147 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
150 * On PM0, there are Task1 and VM0.
151 * On VM0, there is Task2.
152 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
154 * Task1\@PM0 gets 50%.
155 * Task2\@VM0 gets 25%.
156 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
158 * This is because a VM has the dummy CPU action in the PM layer. Putting a task on the VM does not affect the bound of
159 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
161 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
162 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
163 * on the VM in share_resource() or we have to trap both the start and end of task execution.
165 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
167 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
168 * computation task (or a VM) never exceeds the capacity of a CPU core.
170 void VirtualMachine::setBound(double bound)
172 simgrid::simix::kernelImmediate([this, bound]() { pimpl_vm_->setBound(bound); });
174 /** @brief Retrieve a copy of the parameters of that VM/PM
175 * @details The ramsize and overcommit fields are used on the PM too */
176 void VirtualMachine::getParameters(vm_params_t params)
178 pimpl_vm_->getParams(params);
180 /** @brief Sets the params of that VM/PM */
181 void VirtualMachine::setParameters(vm_params_t params)
183 simgrid::simix::kernelImmediate([this, params] { pimpl_vm_->setParams(params); });
186 } // namespace simgrid