1 /* Copyright (c) 2007-2015. 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. */
7 #include "simgrid/s4u/VirtualMachine.hpp"
8 #include "smx_private.h"
9 #include "src/plugins/vm/VirtualMachineImpl.hpp"
10 #include "src/plugins/vm/VmHostExt.hpp"
11 #include "src/surf/HostImpl.hpp"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_vm, simix, "Logging specific to SIMIX Virtual Machines");
15 /* works for VMs and PMs */
16 static long host_get_ramsize(sg_host_t vm, int *overcommit)
19 static_cast<simgrid::s4u::VirtualMachine*>(vm)->parameters(¶ms);
22 *overcommit = params.overcommit;
24 return params.ramsize;
27 /* **** start a VM **** */
28 static int __can_be_started(sg_host_t vm)
30 simgrid::vm::VmHostExt::ensureVmExtInstalled();
32 sg_host_t pm = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getPm();
34 int pm_overcommit = 0;
35 if (pm->extension<simgrid::vm::VmHostExt>() == nullptr)
36 pm->extension_set(new simgrid::vm::VmHostExt());
37 long pm_ramsize = pm->extension<simgrid::vm::VmHostExt>()->ramsize;
38 long vm_ramsize = host_get_ramsize(vm, nullptr);
41 /* We assume users do not want to care about ramsize. */
46 XBT_VERB("%s allows memory overcommit.", sg_host_get_name(pm));
50 long total_ramsize_of_vms = 0;
51 xbt_dynar_t dyn_vms = pm->pimpl_->getVms();
53 unsigned int cursor = 0;
55 xbt_dynar_foreach(dyn_vms, cursor, another_vm) {
56 long another_vm_ramsize = host_get_ramsize(vm, nullptr);
57 total_ramsize_of_vms += another_vm_ramsize;
61 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
62 XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
63 sg_host_get_name(vm), sg_host_get_name(pm),
64 vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
65 xbt_dynar_free(&dyn_vms);
72 void SIMIX_vm_start(sg_host_t vm)
74 if (__can_be_started(vm))
75 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->setState(SURF_VM_STATE_RUNNING);
77 THROWF(vm_error, 0, "The VM %s cannot be started", vm->name().c_str());
81 * @brief Function to migrate a SIMIX VM host.
83 * @param host the vm host to migrate (a sg_host_t)
85 void SIMIX_vm_migrate(sg_host_t vm, sg_host_t dst_pm)
87 /* precopy migration makes the VM temporally paused */
88 xbt_assert(static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() == SURF_VM_STATE_SUSPENDED);
90 /* jump to vm_ws_xigrate(). this will update the vm location. */
91 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->migrate(dst_pm);
95 * @brief Function to suspend a SIMIX VM host. This function stops the execution of the
96 * VM. All the processes on this VM will pause. The state of the VM is
97 * preserved on memory. We can later resume it again.
99 * @param vm the vm host to suspend (a sg_host_t)
101 void SIMIX_vm_suspend(sg_host_t vm, smx_actor_t issuer)
103 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
104 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
106 XBT_DEBUG("suspend VM(%s), where %d processes exist", vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
108 /* jump to vm_ws_suspend. The state will be set. */
109 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->suspend();
111 smx_actor_t smx_process, smx_process_safe;
112 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
113 XBT_DEBUG("suspend %s", smx_process->name.c_str());
114 SIMIX_process_suspend(smx_process, issuer);
117 XBT_DEBUG("suspend all processes on the VM done done");
120 void simcall_HANDLER_vm_suspend(smx_simcall_t simcall, sg_host_t vm)
122 xbt_assert(simcall->issuer->host != vm, "cannot suspend the VM where I run");
124 SIMIX_vm_suspend(vm, simcall->issuer);
126 XBT_DEBUG("simcall_HANDLER_vm_suspend done");
131 * @brief Function to resume a SIMIX VM host. This function restart the execution of the
132 * VM. All the processes on this VM will run again.
134 * @param vm the vm host to resume (a sg_host_t)
136 void SIMIX_vm_resume(sg_host_t vm)
138 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_SUSPENDED)
139 THROWF(vm_error, 0, "VM(%s) was not suspended", vm->name().c_str());
141 XBT_DEBUG("resume VM(%s), where %d processes exist",
142 vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
144 /* jump to vm_ws_resume() */
145 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
147 smx_actor_t smx_process, smx_process_safe;
148 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
149 XBT_DEBUG("resume %s", smx_process->name.c_str());
150 SIMIX_process_resume(smx_process);
155 * @brief Function to save a SIMIX VM host.
156 * This function is the same as vm_suspend, but the state of the VM is saved to the disk, and not preserved on memory.
157 * We can later restore it again.
159 * @param vm the vm host to save (a sg_host_t)
161 void SIMIX_vm_save(sg_host_t vm, smx_actor_t issuer)
163 const char *name = sg_host_get_name(vm);
165 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
166 THROWF(vm_error, 0, "VM(%s) is not running", name);
168 XBT_DEBUG("save VM(%s), where %d processes exist", name, xbt_swag_size(sg_host_simix(vm)->process_list));
170 /* jump to vm_ws_save() */
171 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->save();
173 smx_actor_t smx_process, smx_process_safe;
174 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
175 XBT_DEBUG("suspend %s", smx_process->name.c_str());
176 SIMIX_process_suspend(smx_process, issuer);
180 void simcall_HANDLER_vm_save(smx_simcall_t simcall, sg_host_t vm)
182 SIMIX_vm_save(vm, simcall->issuer);
186 * @brief Function to shutdown a SIMIX VM host. This function powers off the
187 * VM. All the processes on this VM will be killed. But, the state of the VM is
188 * preserved on memory. We can later start it again.
190 * @param vm the VM to shutdown (a sg_host_t)
192 void SIMIX_vm_shutdown(sg_host_t vm, smx_actor_t issuer)
194 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
195 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
197 XBT_DEBUG("shutdown VM %s, that contains %d processes",
198 vm->name().c_str(),xbt_swag_size(sg_host_simix(vm)->process_list));
200 smx_actor_t smx_process, smx_process_safe;
201 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
202 XBT_DEBUG("kill %s", smx_process->name.c_str());
203 SIMIX_process_kill(smx_process, issuer);
206 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
207 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->setState(SURF_VM_STATE_CREATED);
210 void simcall_HANDLER_vm_shutdown(smx_simcall_t simcall, sg_host_t vm)
212 SIMIX_vm_shutdown(vm, simcall->issuer);