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diff --git a/deps/v8/src/perf-jit.h b/deps/v8/src/perf-jit.h
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+// Copyright 2016 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef V8_PERF_JIT_H_
+#define V8_PERF_JIT_H_
+
+#include "src/log.h"
+
+namespace v8 {
+namespace internal {
+
+#if V8_OS_LINUX
+
+// Linux perf tool logging support
+class PerfJitLogger : public CodeEventLogger {
+ public:
+  PerfJitLogger();
+  virtual ~PerfJitLogger();
+
+  void CodeMoveEvent(AbstractCode* from, Address to) override;
+  void CodeDisableOptEvent(AbstractCode* code,
+                           SharedFunctionInfo* shared) override {}
+
+ private:
+  void OpenJitDumpFile();
+  void CloseJitDumpFile();
+  void* OpenMarkerFile(int fd);
+  void CloseMarkerFile(void* marker_address);
+
+  uint64_t GetTimestamp();
+  void LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo* shared,
+                         const char* name, int length) override;
+
+  // Extension added to V8 log file name to get the low-level log name.
+  static const char kFilenameFormatString[];
+  static const int kFilenameBufferPadding;
+
+  // File buffer size of the low-level log. We don't use the default to
+  // minimize the associated overhead.
+  static const int kLogBufferSize = 2 * MB;
+
+  void LogWriteBytes(const char* bytes, int size);
+  void LogWriteHeader();
+  void LogWriteDebugInfo(Code* code, SharedFunctionInfo* shared);
+
+  static const uint32_t kElfMachIA32 = 3;
+  static const uint32_t kElfMachX64 = 62;
+  static const uint32_t kElfMachARM = 40;
+  static const uint32_t kElfMachMIPS = 10;
+
+  uint32_t GetElfMach() {
+#if V8_TARGET_ARCH_IA32
+    return kElfMachIA32;
+#elif V8_TARGET_ARCH_X64
+    return kElfMachX64;
+#elif V8_TARGET_ARCH_ARM
+    return kElfMachARM;
+#elif V8_TARGET_ARCH_MIPS
+    return kElfMachMIPS;
+#else
+    UNIMPLEMENTED();
+    return 0;
+#endif
+  }
+
+  // Per-process singleton file. We assume that there is one main isolate;
+  // to determine when it goes away, we keep reference count.
+  static base::LazyRecursiveMutex file_mutex_;
+  static FILE* perf_output_handle_;
+  static uint64_t reference_count_;
+  static void* marker_address_;
+  static uint64_t code_index_;
+};
+
+#else
+
+// PerfJitLogger is only implemented on Linux
+class PerfJitLogger : public CodeEventLogger {
+ public:
+  void CodeMoveEvent(AbstractCode* from, Address to) override {
+    UNIMPLEMENTED();
+  }
+
+  void CodeDisableOptEvent(AbstractCode* code,
+                           SharedFunctionInfo* shared) override {
+    UNIMPLEMENTED();
+  }
+
+  void LogRecordedBuffer(AbstractCode* code, SharedFunctionInfo* shared,
+                         const char* name, int length) override {
+    UNIMPLEMENTED();
+  }
+};
+
+#endif  // V8_OS_LINUX
+}  // namespace internal
+}  // namespace v8
+#endif