fe01014faa
Moved View.h and View.cpp from /tools/llvm-mca/Views/ to /lib/MCA/ and /include/llvm/MCA/. This is so that targets can define their own Views within the /lib/Target/ directory (so that the View can use backend functionality). To enable these Views within mca, targets will need to add them to the vector of Views returned by their target's CustomBehaviour::getViews() methods. Differential Revision: https://reviews.llvm.org/D108520
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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