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 <simgrid/vm.h>
13 #include <src/plugins/vm/VmLiveMigration.hpp>
15 XBT_LOG_NEW_DEFAULT_CATEGORY(s4u_vm, "S4U virtual machines");
17 simgrid::xbt::signal<void(simgrid::s4u::VirtualMachine*)> simgrid::s4u::VirtualMachine::onVmShutdown;
22 VirtualMachine::VirtualMachine(const char* name, s4u::Host* pm, int coreAmount)
23 : VirtualMachine(name, pm, coreAmount, 1024)
27 VirtualMachine::VirtualMachine(const char* name, s4u::Host* pm, int coreAmount, size_t ramsize)
28 : Host(name), pimpl_vm_(new vm::VirtualMachineImpl(this, pm, coreAmount, ramsize))
30 XBT_DEBUG("Create VM %s", name);
32 /* Currently, a VM uses the network resource of its physical host */
33 pimpl_netpoint = pm->pimpl_netpoint;
34 // Create a VCPU for this VM
35 surf::CpuCas01* sub_cpu = dynamic_cast<surf::CpuCas01*>(pm->pimpl_cpu);
37 pimpl_cpu = surf_cpu_model_vm->createCpu(this, sub_cpu->getSpeedPeakList(), coreAmount);
38 if (sub_cpu->getPState() != 0)
39 pimpl_cpu->setPState(sub_cpu->getPState());
41 /* Make a process container */
42 extension_set<simgrid::simix::Host>(new simgrid::simix::Host());
44 if (TRACE_vm_is_enabled()) {
45 container_t host_container = instr::Container::byName(pm->getName());
46 new instr::Container(name, "MSG_VM", host_container);
47 instr::Container::byName(getName())->getState("MSG_VM_STATE")->addEntityValue("start", "0 0 1"); // start is blue
48 instr::Container::byName(getName())->getState("MSG_VM_STATE")->addEntityValue("suspend", "1 0 0"); // suspend is red
52 VirtualMachine::~VirtualMachine()
56 XBT_DEBUG("destroy %s", getCname());
58 /* FIXME: this is really strange that everything fails if the next line is removed.
59 * This is as if we shared these data with the PM, which definitely should not be the case...
61 * We need to test that suspending a VM does not suspends the processes running on its PM, for example.
62 * Or we need to simplify this code enough to make it actually readable (but this sounds harder than testing)
64 extension_set<simgrid::simix::Host>(nullptr);
66 /* Don't free these things twice: they are the ones of my physical host */
67 pimpl_netpoint = nullptr;
69 if (TRACE_vm_is_enabled())
70 simgrid::instr::Container::byName(getName())->removeFromParent();
73 void VirtualMachine::start()
75 if (TRACE_vm_is_enabled())
76 simgrid::instr::Container::byName(getName())->getState("MSG_VM_STATE")->pushEvent("start");
78 simgrid::simix::kernelImmediate([this]() {
79 simgrid::vm::VmHostExt::ensureVmExtInstalled();
81 simgrid::s4u::Host* pm = this->pimpl_vm_->getPm();
82 if (pm->extension<simgrid::vm::VmHostExt>() == nullptr)
83 pm->extension_set(new simgrid::vm::VmHostExt());
85 long pm_ramsize = pm->extension<simgrid::vm::VmHostExt>()->ramsize;
86 int pm_overcommit = pm->extension<simgrid::vm::VmHostExt>()->overcommit;
87 long vm_ramsize = this->getRamsize();
89 if (pm_ramsize && not pm_overcommit) { /* Only verify that we don't overcommit on need */
90 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
91 long total_ramsize_of_vms = 0;
92 for (simgrid::s4u::VirtualMachine* const& ws_vm : simgrid::vm::VirtualMachineImpl::allVms_)
93 if (pm == ws_vm->getPm())
94 total_ramsize_of_vms += ws_vm->getRamsize();
96 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
97 XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
98 this->getCname(), pm->getCname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
99 THROWF(vm_error, 0, "Memory shortage on host '%s', VM '%s' cannot be started", pm->getCname(),
104 this->pimpl_vm_->setState(SURF_VM_STATE_RUNNING);
107 if (TRACE_vm_is_enabled())
108 simgrid::instr::Container::byName(getName())->getState("MSG_VM_STATE")->popEvent();
111 void VirtualMachine::suspend()
113 smx_actor_t issuer = SIMIX_process_self();
114 simgrid::simix::kernelImmediate([this, issuer]() { pimpl_vm_->suspend(issuer); });
115 if (TRACE_vm_is_enabled())
116 simgrid::instr::Container::byName(getName())->getState("MSG_VM_STATE")->pushEvent("suspend");
117 XBT_DEBUG("vm_suspend done");
120 void VirtualMachine::resume()
123 if (TRACE_vm_is_enabled())
124 simgrid::instr::Container::byName(getName())->getState("MSG_VM_STATE")->popEvent();
127 void VirtualMachine::shutdown()
129 smx_actor_t issuer = SIMIX_process_self();
130 simgrid::simix::kernelImmediate([this, issuer]() { pimpl_vm_->shutdown(issuer); });
134 void VirtualMachine::destroy()
136 /* First, terminate all processes on the VM if necessary */
139 /* Then, destroy the VM object */
143 simgrid::s4u::Host* VirtualMachine::getPm()
145 return pimpl_vm_->getPm();
148 void VirtualMachine::setPm(simgrid::s4u::Host* pm)
150 simgrid::simix::kernelImmediate([this, pm]() { pimpl_vm_->setPm(pm); });
153 e_surf_vm_state_t VirtualMachine::getState()
155 return simgrid::simix::kernelImmediate([this]() { return pimpl_vm_->getState(); });
158 size_t VirtualMachine::getRamsize()
160 return pimpl_vm_->getRamsize();
163 void VirtualMachine::setRamsize(size_t ramsize)
165 pimpl_vm_->setRamsize(ramsize);
167 /** @brief Set a CPU bound for a given VM.
170 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
173 * On PM0, there are Task1 and VM0.
174 * On VM0, there is Task2.
175 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
177 * Task1\@PM0 gets 50%.
178 * Task2\@VM0 gets 25%.
179 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
181 * 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
182 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
184 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
185 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
186 * on the VM in share_resource() or we have to trap both the start and end of task execution.
188 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
190 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
191 * computation task (or a VM) never exceeds the capacity of a CPU core.
193 void VirtualMachine::setBound(double bound)
195 simgrid::simix::kernelImmediate([this, bound]() { pimpl_vm_->setBound(bound); });
198 } // namespace simgrid
201 /* **************************** Public C interface *************************** */
204 /** @brief Create a new VM object with the default parameters
205 * A VM is treated as a host. The name of the VM must be unique among all hosts.
207 sg_vm_t sg_vm_create_core(sg_host_t pm, const char* name)
209 return sg_vm_create_multicore(pm, name, 1);
211 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
212 * A VM is treated as a host. The name of the VM must be unique among all hosts.
214 sg_vm_t sg_vm_create_multicore(sg_host_t pm, const char* name, int coreAmount)
216 xbt_assert(sg_host_by_name(name) == nullptr,
217 "Cannot create a VM named %s: this name is already used by an host or a VM", name);
219 return new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
222 const char* sg_vm_get_name(sg_vm_t vm)
224 return vm->getCname();
227 /** @brief Get the physical host of a given VM. */
228 sg_host_t sg_vm_get_pm(sg_vm_t vm)
233 void sg_vm_set_ramsize(sg_vm_t vm, size_t size)
235 vm->setRamsize(size);
238 size_t sg_vm_get_ramsize(sg_vm_t vm)
240 return vm->getRamsize();
243 void sg_vm_set_bound(sg_vm_t vm, double bound)
248 /** @brief Returns whether the given VM has just created, not running. */
249 int sg_vm_is_created(sg_vm_t vm)
251 return vm->getState() == SURF_VM_STATE_CREATED;
254 /** @brief Returns whether the given VM is currently running */
255 int sg_vm_is_running(sg_vm_t vm)
257 return vm->getState() == SURF_VM_STATE_RUNNING;
260 /** @brief Returns whether the given VM is currently suspended, not running. */
261 int sg_vm_is_suspended(sg_vm_t vm)
263 return vm->getState() == SURF_VM_STATE_SUSPENDED;
266 /** @brief Start a vm (i.e., boot the guest operating system)
267 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
269 void sg_vm_start(sg_vm_t vm)
274 /** @brief Immediately suspend the execution of all processes within the given VM.
276 * This function stops the execution of the VM. All the processes on this VM
277 * will pause. The state of the VM is preserved. We can later resume it again.
279 * No suspension cost occurs.
281 void sg_vm_suspend(sg_vm_t vm)
286 /** @brief Resume the execution of the VM. All processes on the VM run again.
287 * No resume cost occurs.
289 void sg_vm_resume(sg_vm_t vm)
294 /** @brief Immediately kills all processes within the given VM.
295 * Any memory that they allocated will be leaked, unless you used #MSG_process_on_exit().
297 * No extra delay occurs. If you want to simulate this too, you want to use a #MSG_process_sleep().
299 void sg_vm_shutdown(sg_vm_t vm)
304 /** @brief Destroy a VM. Destroy the VM object from the simulation. */
305 void sg_vm_destroy(sg_vm_t vm)