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 Encompassing simcall to prevent the removal of the src or the dst node at the end of a VM migration
97 * The simcall actually invokes the following calls:
98 * simcall_vm_migrate(vm, dst_pm);
99 * simcall_vm_resume(vm);
101 * It is called at the end of the migration_rx_fun function from msg/msg_vm.c
103 * @param vm VM to migrate
104 * @param src_pm Source physical host
105 * @param dst_pmt Destination physical host
107 void SIMIX_vm_migratefrom_resumeto(sg_host_t vm, sg_host_t src_pm, sg_host_t dst_pm)
109 /* Update the vm location */
110 SIMIX_vm_migrate(vm, dst_pm);
113 smx_actor_t self = SIMIX_process_self();
114 SIMIX_vm_resume(vm, self);
118 * @brief Function to suspend a SIMIX VM host. This function stops the execution of the
119 * VM. All the processes on this VM will pause. The state of the VM is
120 * preserved on memory. We can later resume it again.
122 * @param vm the vm host to suspend (a sg_host_t)
124 void SIMIX_vm_suspend(sg_host_t vm, smx_actor_t issuer)
126 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
127 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
129 XBT_DEBUG("suspend VM(%s), where %d processes exist", vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
131 /* jump to vm_ws_suspend. The state will be set. */
132 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->suspend();
134 smx_actor_t smx_process, smx_process_safe;
135 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
136 XBT_DEBUG("suspend %s", smx_process->name.c_str());
137 SIMIX_process_suspend(smx_process, issuer);
140 XBT_DEBUG("suspend all processes on the VM done done");
143 void simcall_HANDLER_vm_suspend(smx_simcall_t simcall, sg_host_t vm)
145 xbt_assert(simcall->issuer->host != vm, "cannot suspend the VM where I run");
147 SIMIX_vm_suspend(vm, simcall->issuer);
149 XBT_DEBUG("simcall_HANDLER_vm_suspend done");
154 * @brief Function to resume a SIMIX VM host. This function restart the execution of the
155 * VM. All the processes on this VM will run again.
157 * @param vm the vm host to resume (a sg_host_t)
159 void SIMIX_vm_resume(sg_host_t vm, smx_actor_t issuer)
161 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_SUSPENDED)
162 THROWF(vm_error, 0, "VM(%s) was not suspended", vm->name().c_str());
164 XBT_DEBUG("resume VM(%s), where %d processes exist",
165 vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
167 /* jump to vm_ws_resume() */
168 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
170 smx_actor_t smx_process, smx_process_safe;
171 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
172 XBT_DEBUG("resume %s", smx_process->name.c_str());
173 SIMIX_process_resume(smx_process, issuer);
177 void simcall_HANDLER_vm_resume(smx_simcall_t simcall, sg_host_t vm)
179 SIMIX_vm_resume(vm, simcall->issuer);
184 * @brief Function to save a SIMIX VM host.
185 * This function is the same as vm_suspend, but the state of the VM is saved to the disk, and not preserved on memory.
186 * We can later restore it again.
188 * @param vm the vm host to save (a sg_host_t)
190 void SIMIX_vm_save(sg_host_t vm, smx_actor_t issuer)
192 const char *name = sg_host_get_name(vm);
194 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
195 THROWF(vm_error, 0, "VM(%s) is not running", name);
197 XBT_DEBUG("save VM(%s), where %d processes exist", name, xbt_swag_size(sg_host_simix(vm)->process_list));
199 /* jump to vm_ws_save() */
200 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
202 smx_actor_t smx_process, smx_process_safe;
203 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
204 XBT_DEBUG("suspend %s", smx_process->name.c_str());
205 SIMIX_process_suspend(smx_process, issuer);
209 void simcall_HANDLER_vm_save(smx_simcall_t simcall, sg_host_t vm)
211 SIMIX_vm_save(vm, simcall->issuer);
216 * @brief Function to restore a SIMIX VM host. This function restart the execution of the
217 * VM. All the processes on this VM will run again.
219 * @param vm the vm host to restore (a sg_host_t)
221 void SIMIX_vm_restore(sg_host_t vm, smx_actor_t issuer)
223 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_SAVED)
224 THROWF(vm_error, 0, "VM(%s) was not saved", vm->name().c_str());
226 XBT_DEBUG("restore VM(%s), where %d processes exist",
227 vm->name().c_str(), xbt_swag_size(sg_host_simix(vm)->process_list));
229 /* jump to vm_ws_restore() */
230 static_cast<simgrid::s4u::VirtualMachine*>(vm)->pimpl_vm_->resume();
232 smx_actor_t smx_process, smx_process_safe;
233 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
234 XBT_DEBUG("resume %s", smx_process->name.c_str());
235 SIMIX_process_resume(smx_process, issuer);
239 void simcall_HANDLER_vm_restore(smx_simcall_t simcall, sg_host_t vm)
241 SIMIX_vm_restore(vm, simcall->issuer);
246 * @brief Function to shutdown a SIMIX VM host. This function powers off the
247 * VM. All the processes on this VM will be killed. But, the state of the VM is
248 * preserved on memory. We can later start it again.
250 * @param vm the VM to shutdown (a sg_host_t)
252 void SIMIX_vm_shutdown(sg_host_t vm, smx_actor_t issuer)
254 if (SIMIX_vm_get_state(vm) != SURF_VM_STATE_RUNNING)
255 THROWF(vm_error, 0, "VM(%s) is not running", vm->name().c_str());
257 XBT_DEBUG("shutdown VM %s, that contains %d processes",
258 vm->name().c_str(),xbt_swag_size(sg_host_simix(vm)->process_list));
260 smx_actor_t smx_process, smx_process_safe;
261 xbt_swag_foreach_safe(smx_process, smx_process_safe, sg_host_simix(vm)->process_list) {
262 XBT_DEBUG("kill %s", smx_process->name.c_str());
263 SIMIX_process_kill(smx_process, issuer);
266 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
267 static_cast<simgrid::surf::VirtualMachineImpl*>(vm->pimpl_)->setState(SURF_VM_STATE_CREATED);
270 void simcall_HANDLER_vm_shutdown(smx_simcall_t simcall, sg_host_t vm)
272 SIMIX_vm_shutdown(vm, simcall->issuer);
276 * @brief Function to destroy a SIMIX VM host.
278 * @param vm the vm host to destroy (a sg_host_t)
280 void SIMIX_vm_destroy(sg_host_t vm)
282 /* this code basically performs a similar thing like SIMIX_host_destroy() */
283 XBT_DEBUG("destroy %s", vm->name().c_str());
285 /* FIXME: this is really strange that everything fails if the next line is removed.
286 * This is as if we shared these data with the PM, which definitely should not be the case...
288 * We need to test that suspending a VM does not suspends the processes running on its PM, for example.
289 * Or we need to simplify this code enough to make it actually readable (but this sounds harder than testing)
291 vm->extension_set<simgrid::simix::Host>(nullptr);
293 /* Don't free these things twice: they are the ones of my physical host */
294 vm->pimpl_cpu = nullptr;
295 vm->pimpl_netcard = nullptr;