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/surf/HostImpl.hpp"
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(simix_vm, simix, "Logging specific to SIMIX Virtual Machines");
14 /* works for VMs and PMs */
15 static long host_get_ramsize(sg_host_t vm, int *overcommit)
18 static_cast<simgrid::s4u::VirtualMachine*>(vm)->parameters(¶ms);
21 *overcommit = params.overcommit;
23 return params.ramsize;
26 /* **** start a VM **** */
27 static int __can_be_started(sg_host_t vm)
29 sg_host_t pm = static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getPm();
31 int pm_overcommit = 0;
32 long pm_ramsize = host_get_ramsize(pm, &pm_overcommit);
33 long vm_ramsize = host_get_ramsize(vm, nullptr);
36 /* We assume users do not want to care about ramsize. */
41 XBT_VERB("%s allows memory overcommit.", sg_host_get_name(pm));
45 long total_ramsize_of_vms = 0;
46 xbt_dynar_t dyn_vms = pm->pimpl_->getVms();
48 unsigned int cursor = 0;
50 xbt_dynar_foreach(dyn_vms, cursor, another_vm) {
51 long another_vm_ramsize = host_get_ramsize(vm, nullptr);
52 total_ramsize_of_vms += another_vm_ramsize;
56 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
57 XBT_WARN("cannnot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
58 sg_host_get_name(vm), sg_host_get_name(pm),
59 vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
60 xbt_dynar_free(&dyn_vms);
67 void SIMIX_vm_start(sg_host_t vm)
69 if (__can_be_started(vm))
70 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->setState(SURF_VM_STATE_RUNNING);
72 THROWF(vm_error, 0, "The VM %s cannot be started", vm->name().c_str());
76 * @brief Function to migrate a SIMIX VM host.
78 * @param host the vm host to migrate (a sg_host_t)
80 void SIMIX_vm_migrate(sg_host_t vm, sg_host_t dst_pm)
82 /* precopy migration makes the VM temporally paused */
83 xbt_assert(static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() == SURF_VM_STATE_SUSPENDED);
85 /* jump to vm_ws_xigrate(). this will update the vm location. */
86 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->migrate(dst_pm);
90 * @brief Function to suspend a SIMIX VM host. This function stops the execution of the
91 * VM. All the processes on this VM will pause. The state of the VM is
92 * preserved on memory. We can later resume it again.
94 * @param vm the vm host to suspend (a sg_host_t)
96 void SIMIX_vm_suspend(sg_host_t vm, smx_actor_t issuer)
98 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
99 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
101 XBT_DEBUG("suspend VM(%s), where %d processes exist", vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
103 /* jump to vm_ws_suspend. The state will be set. */
104 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->suspend();
106 smx_actor_t smx_process, smx_process_safe;
107 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
108 XBT_DEBUG("suspend %s", smx_process->name.c_str());
109 SIMIX_process_suspend(smx_process, issuer);
112 XBT_DEBUG("suspend all processes on the VM done done");
115 void simcall_HANDLER_vm_suspend(smx_simcall_t simcall, sg_host_t vm)
117 xbt_assert(simcall->issuer->host != vm, "cannot suspend the VM where I run");
119 SIMIX_vm_suspend(vm, simcall->issuer);
121 XBT_DEBUG("simcall_HANDLER_vm_suspend done");
126 * @brief Function to resume a SIMIX VM host. This function restart the execution of the
127 * VM. All the processes on this VM will run again.
129 * @param vm the vm host to resume (a sg_host_t)
131 void SIMIX_vm_resume(sg_host_t vm)
133 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_SUSPENDED)
134 THROWF(vm_error, 0, "VM(%s) was not suspended", vm->name().c_str());
136 XBT_DEBUG("resume VM(%s), where %d processes exist",
137 vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
139 /* jump to vm_ws_resume() */
140 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
142 smx_actor_t smx_process, smx_process_safe;
143 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
144 XBT_DEBUG("resume %s", smx_process->name.c_str());
145 SIMIX_process_resume(smx_process);
150 * @brief Function to save a SIMIX VM host.
151 * This function is the same as vm_suspend, but the state of the VM is saved to the disk, and not preserved on memory.
152 * We can later restore it again.
154 * @param vm the vm host to save (a sg_host_t)
156 void SIMIX_vm_save(sg_host_t vm, smx_actor_t issuer)
158 const char *name = sg_host_get_name(vm);
160 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
161 THROWF(vm_error, 0, "VM(%s) is not running", name);
163 XBT_DEBUG("save VM(%s), where %d processes exist", name, xbt_swag_size(sg_host_simix(vm)->process_list));
165 /* jump to vm_ws_save() */
166 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->save();
168 smx_actor_t smx_process, smx_process_safe;
169 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
170 XBT_DEBUG("suspend %s", smx_process->name.c_str());
171 SIMIX_process_suspend(smx_process, issuer);
175 void simcall_HANDLER_vm_save(smx_simcall_t simcall, sg_host_t vm)
177 SIMIX_vm_save(vm, simcall->issuer);
181 * @brief Function to shutdown a SIMIX VM host. This function powers off the
182 * VM. All the processes on this VM will be killed. But, the state of the VM is
183 * preserved on memory. We can later start it again.
185 * @param vm the VM to shutdown (a sg_host_t)
187 void SIMIX_vm_shutdown(sg_host_t vm, smx_actor_t issuer)
189 if (static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->getState() != SURF_VM_STATE_RUNNING)
190 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
192 XBT_DEBUG("shutdown VM %s, that contains %d processes",
193 vm->name().c_str(),xbt_swag_size(sg_host_simix(vm)->process_list));
195 smx_actor_t smx_process, smx_process_safe;
196 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
197 XBT_DEBUG("kill %s", smx_process->name.c_str());
198 SIMIX_process_kill(smx_process, issuer);
201 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
202 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->setState(SURF_VM_STATE_CREATED);
205 void simcall_HANDLER_vm_shutdown(smx_simcall_t simcall, sg_host_t vm)
207 SIMIX_vm_shutdown(vm, simcall->issuer);