tools/traceline/traceline/rdtsc.h

   1 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef TRACELINE_RDTSC_H_
   6 #define TRACELINE_RDTSC_H_
   7
   8 #include <windows.h>
   9 #include <powrprof.h>
  10
  11 #include <map>
  12
  13 #include "logging.h"
  14
  15 class RDTSCNormalizer {
  16  public:
  17   RDTSCNormalizer() { }
  18   ~RDTSCNormalizer() { }
  19
  20   void Start() {
  21     LARGE_INTEGER freq, now;
  22     if (QueryPerformanceFrequency(&freq) == 0) {
  23       NOTREACHED("");
  24     }
  25     freq_ = freq.QuadPart;
  26
  27     if (QueryPerformanceCounter(&now) == 0) {
  28       NOTREACHED("");
  29     }
  30     start_ = now.QuadPart;
  31   }
  32
  33   // Calculate the time from start for a given processor.
  34   double MsFromStart(void* procid, __int64 stamp) {
  35     return (stamp - start_) / (freq_ / 1000.0);
  36   }
  37
  38  private:
  39   __int64 freq_;
  40   __int64 start_;
  41 };
  42
  43 #endif  // TRACELINE_RDTSC_H_