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::surf::VirtualMachineImpl*>(vm->pimpl_)->setState(SURF_VM_STATE_RUNNING);
72 THROWF(vm_error, 0, "The VM %s cannot be started", vm->name().c_str());
76 e_surf_vm_state_t SIMIX_vm_get_state(sg_host_t vm)
78 return static_cast<simgrid::surf::VirtualMachineImpl*>(vm->pimpl_)->getState();
82 * @brief Function to migrate a SIMIX VM host.
84 * @param host the vm host to migrate (a sg_host_t)
86 void SIMIX_vm_migrate(sg_host_t vm, sg_host_t dst_pm)
88 /* precopy migration makes the VM temporally paused */
89 xbt_assert(SIMIX_vm_get_state(vm) == SURF_VM_STATE_SUSPENDED);
91 /* jump to vm_ws_xigrate(). this will update the vm location. */
92 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->migrate(dst_pm);
96 * @brief Function to suspend a SIMIX VM host. This function stops the execution of the
97 * VM. All the processes on this VM will pause. The state of the VM is
98 * preserved on memory. We can later resume it again.
100 * @param vm the vm host to suspend (a sg_host_t)
102 void SIMIX_vm_suspend(sg_host_t vm, smx_actor_t issuer)
104 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
105 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
107 XBT_DEBUG("suspend VM(%s), where %d processes exist", vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
109 /* jump to vm_ws_suspend. The state will be set. */
110 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->suspend();
112 smx_actor_t smx_process, smx_process_safe;
113 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
114 XBT_DEBUG("suspend %s", smx_process->name.c_str());
115 SIMIX_process_suspend(smx_process, issuer);
118 XBT_DEBUG("suspend all processes on the VM done done");
121 void simcall_HANDLER_vm_suspend(smx_simcall_t simcall, sg_host_t vm)
123 xbt_assert(simcall->issuer->host != vm, "cannot suspend the VM where I run");
125 SIMIX_vm_suspend(vm, simcall->issuer);
127 XBT_DEBUG("simcall_HANDLER_vm_suspend done");
132 * @brief Function to resume a SIMIX VM host. This function restart the execution of the
133 * VM. All the processes on this VM will run again.
135 * @param vm the vm host to resume (a sg_host_t)
137 void SIMIX_vm_resume(sg_host_t vm)
139 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_SUSPENDED)
140 THROWF(vm_error, 0, "VM(%s) was not suspended", vm->name().c_str());
142 XBT_DEBUG("resume VM(%s), where %d processes exist",
143 vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
145 /* jump to vm_ws_resume() */
146 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
148 smx_actor_t smx_process, smx_process_safe;
149 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
150 XBT_DEBUG("resume %s", smx_process->name.c_str());
151 SIMIX_process_resume(smx_process);
156 * @brief Function to save a SIMIX VM host.
157 * This function is the same as vm_suspend, but the state of the VM is saved to the disk, and not preserved on memory.
158 * We can later restore it again.
160 * @param vm the vm host to save (a sg_host_t)
162 void SIMIX_vm_save(sg_host_t vm, smx_actor_t issuer)
164 const char *name = sg_host_get_name(vm);
166 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
167 THROWF(vm_error, 0, "VM(%s) is not running", name);
169 XBT_DEBUG("save VM(%s), where %d processes exist", name, xbt_swag_size(sg_host_simix(vm)->process_list));
171 /* jump to vm_ws_save() */
172 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->save();
174 smx_actor_t smx_process, smx_process_safe;
175 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
176 XBT_DEBUG("suspend %s", smx_process->name.c_str());
177 SIMIX_process_suspend(smx_process, issuer);
181 void simcall_HANDLER_vm_save(smx_simcall_t simcall, sg_host_t vm)
183 SIMIX_vm_save(vm, simcall->issuer);
187 * @brief Function to shutdown a SIMIX VM host. This function powers off the
188 * VM. All the processes on this VM will be killed. But, the state of the VM is
189 * preserved on memory. We can later start it again.
191 * @param vm the VM to shutdown (a sg_host_t)
193 void SIMIX_vm_shutdown(sg_host_t vm, smx_actor_t issuer)
195 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
196 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
198 XBT_DEBUG("shutdown VM %s, that contains %d processes",
199 vm->name().c_str(),xbt_swag_size(sg_host_simix(vm)->process_list));
201 smx_actor_t smx_process, smx_process_safe;
202 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
203 XBT_DEBUG("kill %s", smx_process->name.c_str());
204 SIMIX_process_kill(smx_process, issuer);
207 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
208 static_cast<simgrid::surf::VirtualMachineImpl*>(vm->pimpl_)->setState(SURF_VM_STATE_CREATED);
211 void simcall_HANDLER_vm_shutdown(smx_simcall_t simcall, sg_host_t vm)
213 SIMIX_vm_shutdown(vm, simcall->issuer);