1 // Copyright (c) 2012 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 CHROME_BROWSER_PERFORMANCE_MONITOR_CONSTANTS_H_ 6 #define CHROME_BROWSER_PERFORMANCE_MONITOR_CONSTANTS_H_ 7 8 #include "base/basictypes.h" 9 #include "base/time/time.h" 10 11 namespace performance_monitor { 12 13 // Constants which are used by the PerformanceMonitor and its related classes. 14 // The constants should be documented alongside the definition of their values 15 // in the .cc file. 16 17 extern const char kMetricNotFoundError[]; 18 extern const char kProcessChromeAggregate[]; 19 20 // State tokens 21 extern const char kStateChromeVersion[]; 22 extern const char kStateProfilePrefix[]; 23 24 // The interval the watched processes are sampled for performance metrics. 25 const int kSampleIntervalInSeconds = 10; 26 // The default interval at which PerformanceMonitor performs its timed 27 // collections; this can be overridden by using the kPerformanceMonitorGathering 28 // switch with an associated (positive integer) value. 29 const int kDefaultGatherIntervalInSeconds = 120; 30 31 // Unit values (for use in metric, and on the UI side). 32 33 // Memory measurements 34 const int64 kBytesPerKilobyte = 1 << 10; 35 const int64 kBytesPerMegabyte = kBytesPerKilobyte * (1 << 10); 36 const int64 kBytesPerGigabyte = kBytesPerMegabyte * (1 << 10); 37 const int64 kBytesPerTerabyte = kBytesPerGigabyte * (1 << 10); 38 39 // Time measurements - Most of these are imported from base/time/time.h 40 // These units are used for display (and it's related calculations), not for 41 // any mathematical analysis. Thus we can estimate for values without an exact 42 // conversion. 43 const int64 kMicrosecondsPerMonth = base::Time::kMicrosecondsPerDay * 30; 44 const int64 kMicrosecondsPerYear = base::Time::kMicrosecondsPerDay * 365; 45 46 // Performance alert thresholds 47 48 // If a process is consistently above this CPU utilization percentage over time, 49 // we consider it as high and may take action. 50 const float kHighCPUUtilizationThreshold = 90.0f; 51 } // namespace performance_monitor 52 53 #endif // CHROME_BROWSER_PERFORMANCE_MONITOR_CONSTANTS_H_ 54
