| //===--------------------- SchedulerStatistics.h ----------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// \file |
| /// |
| /// This file defines class SchedulerStatistics. Class SchedulerStatistics is a |
| /// View that listens to instruction issue events in order to print general |
| /// statistics related to the hardware schedulers. |
| /// |
| /// Example: |
| /// ======== |
| /// |
| /// Schedulers - number of cycles where we saw N instructions issued: |
| /// [# issued], [# cycles] |
| /// 0, 6 (2.9%) |
| /// 1, 106 (50.7%) |
| /// 2, 97 (46.4%) |
| /// |
| /// Scheduler's queue usage: |
| /// [1] Resource name. |
| /// [2] Average number of used buffer entries. |
| /// [3] Maximum number of used buffer entries. |
| /// [4] Total number of buffer entries. |
| /// |
| /// [1] [2] [3] [4] |
| /// JALU01 0 0 20 |
| /// JFPU01 15 18 18 |
| /// JLSAGU 0 0 12 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TOOLS_LLVM_MCA_SCHEDULERSTATISTICS_H |
| #define LLVM_TOOLS_LLVM_MCA_SCHEDULERSTATISTICS_H |
| |
| #include "Views/View.h" |
| #include "llvm/ADT/SmallVector.h" |
| #include "llvm/MC/MCSubtargetInfo.h" |
| #include <map> |
| |
| namespace llvm { |
| namespace mca { |
| |
| class SchedulerStatistics final : public View { |
| const llvm::MCSchedModel &SM; |
| unsigned LQResourceID; |
| unsigned SQResourceID; |
| |
| unsigned NumIssued; |
| unsigned NumCycles; |
| |
| unsigned MostRecentLoadDispatched; |
| unsigned MostRecentStoreDispatched; |
| |
| // Tracks the usage of a scheduler's queue. |
| struct BufferUsage { |
| unsigned SlotsInUse; |
| unsigned MaxUsedSlots; |
| uint64_t CumulativeNumUsedSlots; |
| }; |
| |
| using Histogram = std::map<unsigned, unsigned>; |
| Histogram IssueWidthPerCycle; |
| |
| std::vector<BufferUsage> Usage; |
| |
| void updateHistograms(); |
| void printSchedulerStats(llvm::raw_ostream &OS) const; |
| void printSchedulerUsage(llvm::raw_ostream &OS) const; |
| |
| public: |
| SchedulerStatistics(const llvm::MCSubtargetInfo &STI); |
| void onEvent(const HWInstructionEvent &Event) override; |
| void onCycleBegin() override { NumCycles++; } |
| void onCycleEnd() override { updateHistograms(); } |
| |
| // Increases the number of used scheduler queue slots of every buffered |
| // resource in the Buffers set. |
| void onReservedBuffers(const InstRef &IR, |
| llvm::ArrayRef<unsigned> Buffers) override; |
| |
| // Decreases by one the number of used scheduler queue slots of every |
| // buffered resource in the Buffers set. |
| void onReleasedBuffers(const InstRef &IR, |
| llvm::ArrayRef<unsigned> Buffers) override; |
| |
| void printView(llvm::raw_ostream &OS) const override; |
| StringRef getNameAsString() const override { return "SchedulerStatistics"; } |
| }; |
| } // namespace mca |
| } // namespace llvm |
| |
| #endif |