//===--------------------- SchedulerStatistics.h ----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file defines class SchedulerStatistics. Class SchedulerStatistics is a
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/// View that listens to instruction issue events in order to print general
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/// statistics related to the hardware schedulers.
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///
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/// Example:
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/// ========
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///
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/// Schedulers - number of cycles where we saw N instructions issued:
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/// [# issued], [# cycles]
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/// 0, 7 (5.4%)
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/// 1, 4 (3.1%)
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/// 2, 8 (6.2%)
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///
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/// Scheduler's queue usage:
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/// JALU01, 0/20
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/// JFPU01, 18/18
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/// JLSAGU, 0/12
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_SCHEDULERSTATISTICS_H
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#define LLVM_TOOLS_LLVM_MCA_SCHEDULERSTATISTICS_H
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#include "View.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include <map>
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namespace mca {
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class SchedulerStatistics : public View {
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const llvm::MCSchedModel &SM;
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using Histogram = std::map<unsigned, unsigned>;
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Histogram IssuedPerCycle;
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unsigned NumIssued;
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unsigned NumCycles;
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// Tracks the usage of a scheduler's queue.
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struct BufferUsage {
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unsigned SlotsInUse;
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unsigned MaxUsedSlots;
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};
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std::map<unsigned, BufferUsage> BufferedResources;
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void updateHistograms() {
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IssuedPerCycle[NumIssued]++;
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NumIssued = 0;
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}
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void printSchedulerStatistics(llvm::raw_ostream &OS) const;
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void printSchedulerUsage(llvm::raw_ostream &OS) const;
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public:
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SchedulerStatistics(const llvm::MCSubtargetInfo &STI)
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: SM(STI.getSchedModel()), NumIssued(0), NumCycles(0) {}
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void onEvent(const HWInstructionEvent &Event) override;
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void onCycleBegin() override { NumCycles++; }
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void onCycleEnd() override { updateHistograms(); }
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// Increases the number of used scheduler queue slots of every buffered
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// resource in the Buffers set.
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void onReservedBuffers(llvm::ArrayRef<unsigned> Buffers) override;
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// Decreases by one the number of used scheduler queue slots of every
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// buffered resource in the Buffers set.
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void onReleasedBuffers(llvm::ArrayRef<unsigned> Buffers) override;
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void printView(llvm::raw_ostream &OS) const override {
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printSchedulerStatistics(OS);
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printSchedulerUsage(OS);
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}
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};
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} // namespace mca
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#endif
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