X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/1933a95e2b0981f030408fa642adc48877934c75..9e9882ce69af88130c9047bf152c92e19acc805d:/src/plugins/vm/s4u_VirtualMachine.cpp

diff --git a/src/plugins/vm/s4u_VirtualMachine.cpp b/src/plugins/vm/s4u_VirtualMachine.cpp
index 5b0ade8efc..8bda7e7137 100644
--- a/src/plugins/vm/s4u_VirtualMachine.cpp
+++ b/src/plugins/vm/s4u_VirtualMachine.cpp
@@ -92,6 +92,18 @@ void VirtualMachine::start()
   });
 }
 
+void VirtualMachine::suspend()
+{
+  smx_actor_t issuer = SIMIX_process_self();
+  simgrid::simix::kernelImmediate([this, issuer]() { pimpl_vm_->suspend(issuer); });
+  XBT_DEBUG("vm_suspend done");
+}
+
+void VirtualMachine::resume()
+{
+  pimpl_vm_->resume();
+}
+
 bool VirtualMachine::isMigrating()
 {
   return pimpl_vm_ && pimpl_vm_->isMigrating;
@@ -116,7 +128,36 @@ void VirtualMachine::setRamsize(size_t ramsize)
 {
   pimpl_vm_->setRamsize(ramsize);
 }
-
+/** @brief Set a CPU bound for a given VM.
+ *  @ingroup msg_VMs
+ *
+ * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
+ *
+ * For example,
+ *  On PM0, there are Task1 and VM0.
+ *  On VM0, there is Task2.
+ * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
+ * Then,
+ *  Task1\@PM0 gets 50%.
+ *  Task2\@VM0 gets 25%.
+ * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
+ *
+ * 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
+ * the dummy CPU action. The bound of the dummy CPU action is unlimited.
+ *
+ * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
+ * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
+ * on the VM in share_resource() or we have to trap both the start and end of task execution.
+ *
+ * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
+ *
+ * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
+ *    computation task (or a VM) never exceeds the capacity of a CPU core.
+ */
+void VirtualMachine::setBound(double bound)
+{
+  simgrid::simix::kernelImmediate([this, bound]() { pimpl_vm_->setBound(bound); });
+}
 /** @brief Retrieve a copy of the parameters of that VM/PM
  *  @details The ramsize and overcommit fields are used on the PM too */
 void VirtualMachine::getParameters(vm_params_t params)