of_scheduling_policy.hh

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/*
 * Copyright (c) 2014-2017 Advanced Micro Devices, Inc.
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#ifndef __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__
#define __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__
 
#include <vector>
 
#include "gpu-compute/scheduling_policy.hh"
#include "gpu-compute/wavefront.hh"
 
namespace gem5
{
 
// oldest first where age is marked by the wave id
class OFSchedulingPolicy final : public __SchedulingPolicy<OFSchedulingPolicy>
{
  public:
    OFSchedulingPolicy()
    {
    }
 
    static Wavefront*
    __chooseWave(std::vector<Wavefront*> *sched_list)
    {
        panic_if(!sched_list->size(), "OF scheduling policy sched list is "
            "empty.\n");
        // set when policy choose a wave to schedule
        Wavefront *selected_wave(nullptr);
        int selected_wave_id = -1;
        int selected_position = 0;
 
        for (int position = 0; position < sched_list->size(); ++position) {
            Wavefront *cur_wave = sched_list->at(position);
            int cur_wave_id = cur_wave->wfDynId;
 
            // Choosed wave with the lowest wave ID
            if (selected_wave_id == -1 || cur_wave_id < selected_wave_id) {
                selected_wave_id = cur_wave_id;
                selected_wave = cur_wave;
                selected_position = position;
            }
        }
 
        // Check to make sure ready list had at least one schedulable wave
        panic_if(!selected_wave, "No wave found by OF scheduling policy.\n");
        sched_list->erase(sched_list->begin() + selected_position);
 
        return selected_wave;
    }
};
 
} // namespace gem5
 
#endif // __GPU_COMPUTE_OF_SCHEDULING_POLICY_HH__