98 lines
3.0 KiB
C++
98 lines
3.0 KiB
C++
//===--------------------- SchedulerStatistics.h ----------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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, 6 (2.9%)
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/// 1, 106 (50.7%)
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/// 2, 97 (46.4%)
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///
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/// Scheduler's queue usage:
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/// [1] Resource name.
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/// [2] Average number of used buffer entries.
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/// [3] Maximum number of used buffer entries.
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/// [4] Total number of buffer entries.
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///
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/// [1] [2] [3] [4]
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/// JALU01 0 0 20
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/// JFPU01 15 18 18
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/// JLSAGU 0 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 "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MCA/View.h"
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#include <map>
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namespace llvm {
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namespace mca {
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class SchedulerStatistics final : public View {
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const llvm::MCSchedModel &SM;
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unsigned LQResourceID;
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unsigned SQResourceID;
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unsigned NumIssued;
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unsigned NumCycles;
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unsigned MostRecentLoadDispatched;
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unsigned MostRecentStoreDispatched;
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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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uint64_t CumulativeNumUsedSlots;
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};
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using Histogram = std::map<unsigned, unsigned>;
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Histogram IssueWidthPerCycle;
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std::vector<BufferUsage> Usage;
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void updateHistograms();
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void printSchedulerStats(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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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(const InstRef &IR,
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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(const InstRef &IR,
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llvm::ArrayRef<unsigned> Buffers) override;
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void printView(llvm::raw_ostream &OS) const override;
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StringRef getNameAsString() const override { return "SchedulerStatistics"; }
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bool isSerializable() const override { return false; }
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};
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} // namespace mca
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} // namespace llvm
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#endif
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