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diff --git a/src/traced/probes/common/cpu_freq_info.h b/src/traced/probes/common/cpu_freq_info.h
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+++ b/src/traced/probes/common/cpu_freq_info.h
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+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SRC_TRACED_PROBES_COMMON_CPU_FREQ_INFO_H_
+#define SRC_TRACED_PROBES_COMMON_CPU_FREQ_INFO_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "perfetto/ext/base/scoped_file.h"
+
+namespace perfetto {
+
+class CpuFreqInfo {
+ public:
+  explicit CpuFreqInfo(std::string cpu_dir_path = "/sys/devices/system/cpu");
+  virtual ~CpuFreqInfo();
+
+  using Range =
+      std::pair</* begin */ const uint32_t*, /* end */ const uint32_t*>;
+  Range GetFreqs(uint32_t cpu);
+  uint32_t GetCpuFreqIndex(uint32_t cpu, uint32_t freq);
+
+ private:
+  // All frequencies of all CPUs, ordered by CPU and frequency. Includes a guard
+  // at the end.
+  std::vector<uint32_t> frequencies_;
+  // frequencies_index_[cpu] points to first frequency in frequencies_. Includes
+  // a guard at the end.
+  std::vector<size_t> frequencies_index_;
+
+  std::string ReadFile(std::string path);
+};
+
+}  // namespace perfetto
+
+#endif  // SRC_TRACED_PROBES_COMMON_CPU_FREQ_INFO_H_