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//===--------------------- 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
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