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/*
* Copyright (c) 2014-2017 Advanced Micro Devices, Inc.
* All rights reserved.
*
* For use for simulation and test purposes only
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Sooraj Puthoor,
* Anthony Gutierrez
*/
#ifndef __GPU_COMPUTE_RR_SCHEDULING_POLICY_HH__
#define __GPU_COMPUTE_RR_SCHEDULING_POLICY_HH__
#include <vector>
#include "gpu-compute/scheduling_policy.hh"
#include "gpu-compute/wavefront.hh"
// round-robin pick among the list of ready waves
class RRSchedulingPolicy final : public __SchedulingPolicy<RRSchedulingPolicy>
{
public:
RRSchedulingPolicy()
{
}
static Wavefront*
__chooseWave(std::vector<Wavefront*> *sched_list)
{
panic_if(!sched_list->size(), "RR scheduling policy sched list is "
"empty.\n");
Wavefront *selected_wave(nullptr);
/**
* For RR policy, select the wave that is at the front of
* the list. The selected wave is popped out from the schedule
* list immediately after selection to avoid starvation. It
* is the responsibility of the module invoking the RR scheduler
* to make sure it is scheduling eligible waves are added to the
* back of the schedule list.
*/
selected_wave = sched_list->front();
panic_if(!selected_wave, "No wave found by RR scheduling policy.\n");
sched_list->erase(sched_list->begin());
return selected_wave;
}
};
#endif // __GPU_COMPUTE_RR_SCHEDULING_POLICY_HH__
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