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//===--------------------- SchedulerStatistics.h ----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \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 mca {
class SchedulerStatistics final : public View {
const llvm::MCSchedModel &SM;
unsigned NumIssued;
unsigned NumCycles;
// Tracks the usage of a scheduler's queue.
struct BufferUsage {
unsigned SlotsInUse;
unsigned MaxUsedSlots;
uint64_t CumulativeNumUsedSlots;
};
std::vector<unsigned> IssuedPerCycle;
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)
: SM(STI.getSchedModel()), NumIssued(0), NumCycles(0),
IssuedPerCycle(STI.getSchedModel().NumProcResourceKinds, 0),
Usage(STI.getSchedModel().NumProcResourceKinds, {0, 0, 0}) {}
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;
};
} // namespace mca
#endif
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