--- /dev/null
+/* Copyright (c) 2004-2021. The SimGrid Team. All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#ifndef CPU_IMPL_HPP_
+#define CPU_IMPL_HPP_
+
+#include "simgrid/kernel/resource/Model.hpp"
+#include "simgrid/s4u/Host.hpp"
+#include "src/kernel/lmm/maxmin.hpp"
+#include "src/kernel/resource/Resource.hpp"
+
+#include <list>
+
+namespace simgrid {
+namespace kernel {
+namespace resource {
+
+/***********
+ * Classes *
+ ***********/
+
+class CpuAction;
+
+/*********
+ * Model *
+ *********/
+class XBT_PUBLIC CpuModel : public Model {
+public:
+ using Model::Model;
+
+ /**
+ * @brief Create a Cpu
+ *
+ * @param host The host that will have this CPU
+ * @param speed_per_pstate Processor speed (in Flops) of each pstate.
+ * This ignores any potential external load coming from a trace.
+ * @param core The number of core of this Cpu
+ */
+ virtual CpuImpl* create_cpu(s4u::Host* host, const std::vector<double>& speed_per_pstate) = 0;
+
+ void update_actions_state_lazy(double now, double delta) override;
+ void update_actions_state_full(double now, double delta) override;
+};
+
+/************
+ * Resource *
+ ************/
+
+class XBT_PUBLIC CpuImpl : public Resource_T<CpuImpl> {
+ friend VirtualMachineImpl; // Resets the VCPU
+
+ s4u::Host* piface_;
+ int core_count_ = 1;
+ unsigned long pstate_ = 0; /*< Current pstate (index in the speed_per_pstate_)*/
+ std::vector<double> speed_per_pstate_; /*< List of supported CPU capacities (pstate related). Not 'const' because VCPU
+ get modified on migration */
+ s4u::Host::SharingPolicy sharing_policy_ = s4u::Host::SharingPolicy::LINEAR;
+ s4u::NonLinearResourceCb sharing_policy_cb_;
+
+ void apply_sharing_policy_cfg() const;
+
+public:
+ /**
+ * @brief Cpu constructor
+ *
+ * @param host The host in which this Cpu should be plugged
+ * @param speed_per_pstate Processor speed (in flop per second) for each pstate
+ */
+ CpuImpl(s4u::Host* host, const std::vector<double>& speed_per_pstate);
+
+ CpuImpl(const CpuImpl&) = delete;
+ CpuImpl& operator=(const CpuImpl&) = delete;
+
+ /** @brief Public interface */
+ s4u::Host* get_iface() const { return piface_; }
+
+ CpuImpl* set_core_count(int core_count);
+ virtual int get_core_count() const { return core_count_; }
+
+ void seal() override;
+
+ /** @brief Get a forecast of the speed (in flops/s) if the load were as provided.
+ *
+ * The provided load should encompasses both the application's activities and the external load that come from a
+ * trace.
+ *
+ * Use a load of 1.0 to compute the amount of flops that the Cpu would deliver with one CPU-bound task.
+ * If you use a load of 0, this function will return 0: when nobody is using the Cpu, it delivers nothing.
+ *
+ * If you want to know the amount of flops currently delivered, use load = get_load()*get_speed_ratio()
+ */
+ virtual double get_speed(double load) const { return load * speed_.peak; }
+
+ /** @brief Get the available speed ratio, in [0:1]. This accounts for external load (see @ref set_speed_profile()). */
+ virtual double get_speed_ratio() { return speed_.scale; }
+
+ /** @brief Get the peak processor speed (in flops/s), at the specified pstate */
+ virtual double get_pstate_peak_speed(unsigned long pstate_index) const;
+
+ virtual unsigned long get_pstate_count() const { return speed_per_pstate_.size(); }
+
+ virtual unsigned long get_pstate() const { return pstate_; }
+ virtual CpuImpl* set_pstate(unsigned long pstate_index);
+
+ /*< @brief Setup the profile file with availability events (peak speed changes due to external load).
+ * Profile must contain relative values (ratio between 0 and 1)
+ */
+ virtual CpuImpl* set_speed_profile(profile::Profile* profile);
+
+ /**
+ * @brief Set the CPU's speed
+ *
+ * @param speed_per_state list of powers for this processor (default power is at index 0)
+ */
+ CpuImpl* set_pstate_speed(const std::vector<double>& speed_per_state);
+
+ void set_sharing_policy(s4u::Host::SharingPolicy policy, const s4u::NonLinearResourceCb& cb);
+ s4u::Host::SharingPolicy get_sharing_policy() const { return sharing_policy_; }
+
+ /**
+ * @brief Sets factor callback
+ * Implemented only for cas01
+ */
+ virtual void set_factor_cb(const std::function<s4u::Host::CpuFactorCb>& cb) { THROW_UNIMPLEMENTED; }
+
+ /**
+ * @brief Execute some quantity of computation
+ *
+ * @param size The value of the processing amount (in flop) needed to process
+ * @param user_bound User's bound for execution speed
+ * @return The CpuAction corresponding to the processing
+ */
+ virtual CpuAction* execution_start(double size, double user_bound) = 0;
+
+ /**
+ * @brief Execute some quantity of computation on more than one core
+ *
+ * @param size The value of the processing amount (in flop) needed to process
+ * @param requested_cores The desired amount of cores. Must be >= 1
+ * @param user_bound User's bound for execution speed
+ * @return The CpuAction corresponding to the processing
+ */
+ virtual CpuAction* execution_start(double size, int requested_cores, double user_bound) = 0;
+
+ /**
+ * @brief Make a process sleep for duration (in seconds)
+ *
+ * @param duration The number of seconds to sleep
+ * @return The CpuAction corresponding to the sleeping
+ */
+ virtual CpuAction* sleep(double duration) = 0;
+
+protected:
+ /** @brief Take speed changes (either load or max) into account */
+ virtual void on_speed_change();
+
+ /** Reset most characteristics of this CPU to the one of that CPU.
+ *
+ * Used to reset a VCPU when its VM migrates to another host, so it only resets the fields that should be in this
+ *case.
+ **/
+ virtual void reset_vcpu(CpuImpl* that);
+
+ Metric speed_ = {1.0, 0, nullptr};
+};
+
+/**********
+ * Action *
+ **********/
+
+/** @ingroup SURF_cpu_interface
+ * @brief A CpuAction represents the execution of code on one or several Cpus
+ */
+class XBT_PUBLIC CpuAction : public Action {
+public:
+ using Action::Action;
+
+ /** @brief Signal emitted when the action state changes (ready/running/done, etc)
+ * Signature: `void(CpuAction const& action, simgrid::kernel::resource::Action::State previous)`
+ */
+ static xbt::signal<void(CpuAction const&, Action::State)> on_state_change;
+
+ void set_state(Action::State state) override;
+
+ void update_remains_lazy(double now) override;
+ std::list<CpuImpl*> cpus() const;
+
+ void suspend() override;
+ void resume() override;
+};
+} // namespace resource
+} // namespace kernel
+} // namespace simgrid
+
+#endif /* CPU_IMPL_HPP_ */
