| //===-- X86Counter.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 |
| /// Perf counter that reads the LBRs for measuring the benchmarked block's |
| /// throughput. |
| /// |
| /// More info at: https://lwn.net/Articles/680985 |
| //===----------------------------------------------------------------------===// |
| #ifndef LLVM_TOOLS_LLVM_EXEGESIS_LIB_X86_X86COUNTER_H |
| #define LLVM_TOOLS_LLVM_EXEGESIS_LIB_X86_X86COUNTER_H |
| |
| #include "../PerfHelper.h" |
| #include "llvm/Support/Error.h" |
| |
| // FIXME: Use appropriate wrappers for poll.h and mman.h |
| // to support Windows and remove this linux-only guard. |
| #if defined(__linux__) && defined(HAVE_LIBPFM) && \ |
| defined(LIBPFM_HAS_FIELD_CYCLES) |
| |
| namespace llvm { |
| namespace exegesis { |
| |
| class X86LbrPerfEvent : public pfm::PerfEvent { |
| public: |
| X86LbrPerfEvent(unsigned SamplingPeriod); |
| }; |
| |
| class X86LbrCounter : public pfm::Counter { |
| public: |
| static llvm::Error checkLbrSupport(); |
| |
| explicit X86LbrCounter(pfm::PerfEvent &&Event); |
| |
| virtual ~X86LbrCounter(); |
| |
| void start() override; |
| |
| llvm::Expected<llvm::SmallVector<int64_t, 4>> |
| readOrError(StringRef FunctionBytes) const override; |
| |
| private: |
| llvm::Expected<llvm::SmallVector<int64_t, 4>> |
| doReadCounter(const void *From, const void *To) const; |
| |
| void *MMappedBuffer = nullptr; |
| }; |
| |
| } // namespace exegesis |
| } // namespace llvm |
| |
| #endif // defined(__linux__) && defined(HAVE_LIBPFM) && |
| // defined(LIBPFM_HAS_FIELD_CYCLES) |
| |
| #endif // LLVM_TOOLS_LLVM_EXEGESIS_LIB_X86_X86COUNTER_H |