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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/performance_monitor/metric.h"
#include "base/basictypes.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/time.h"
#include "chrome/browser/performance_monitor/constants.h"
namespace performance_monitor {
namespace {
// For certain metrics (for instance, bytes read), it is possible that there is
// no maximum value which we can safely assume.
const double kNoMaximum = -1.0;
// These constants are designed to keep metrics reasonable. However, due to the
// variety of system configurations which can run chrome, these values may not
// catch *all* erroneous values. For instance, on a one-CPU machine, any CPU
// usage > 100 is erroneous, but on a 16-CPU machine, it's perfectly normal.
// These are "best-guesses" in order to weed out obviously-false values. A
// metric is valid if it is greater than or equal to the minimum and less than
// the maximum, i.e. if it falls in the range [min, max).
const double kMinUndefined = 0.0;
const double kMaxUndefined = 0.0; // No undefined metric is valid.
const double kMinCpuUsage = 0.0;
const double kMaxCpuUsage = 100000.0; // 100% on a 1000-CPU machine.
const double kMinPrivateMemoryUsage = 0.0;
const double kMaxPrivateMemoryUsage = kBytesPerTerabyte;
const double kMinSharedMemoryUsage = 0.0;
const double kMaxSharedMemoryUsage = kBytesPerTerabyte;
const double kMinStartupTime = 0.0;
const double kMaxStartupTime = base::Time::kMicrosecondsPerMinute * 15.0;
const double kMinTestStartupTime = 0.0;
const double kMaxTestStartupTime = base::Time::kMicrosecondsPerMinute * 15.0;
const double kMinSessionRestoreTime = 0.0;
const double kMaxSessionRestoreTime = base::Time::kMicrosecondsPerMinute * 15.0;
const double kMinPageLoadTime = 0.0;
const double kMaxPageLoadTime = base::Time::kMicrosecondsPerMinute * 15.0;
const double kMinNetworkBytesRead = 0.0;
const double kMaxNetworkBytesRead = kNoMaximum;
struct MetricBound {
double min;
double max;
};
const MetricBound kMetricBounds[] = {
{ kMinUndefined, kMaxUndefined },
{ kMinCpuUsage, kMaxCpuUsage },
{ kMinPrivateMemoryUsage, kMaxPrivateMemoryUsage },
{ kMinSharedMemoryUsage, kMaxSharedMemoryUsage },
{ kMinStartupTime, kMaxStartupTime },
{ kMinTestStartupTime, kMaxTestStartupTime },
{ kMinSessionRestoreTime, kMaxSessionRestoreTime },
{ kMinPageLoadTime, kMaxPageLoadTime },
{ kMinNetworkBytesRead, kMaxNetworkBytesRead },
};
COMPILE_ASSERT(ARRAYSIZE_UNSAFE(kMetricBounds) == METRIC_NUMBER_OF_METRICS,
metric_bounds_size_doesnt_match_metric_count);
} // namespace
Metric::Metric() : type(METRIC_UNDEFINED), value(0.0) {
}
Metric::Metric(MetricType metric_type,
const base::Time& metric_time,
const double metric_value)
: type(metric_type), time(metric_time), value(metric_value) {
}
Metric::Metric(MetricType metric_type,
const std::string& metric_time,
const std::string& metric_value) : type(metric_type) {
int64 conversion = 0;
base::StringToInt64(metric_time, &conversion);
time = base::Time::FromInternalValue(conversion);
CHECK(base::StringToDouble(metric_value, &value));
}
Metric::~Metric() {
}
bool Metric::IsValid() const {
return type < METRIC_NUMBER_OF_METRICS &&
(value < kMetricBounds[type].max ||
kMetricBounds[type].max == kNoMaximum) &&
value >= kMetricBounds[type].min;
}
std::string Metric::ValueAsString() const {
return base::DoubleToString(value);
}
} // namespace performance_monitor
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