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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 // Histogram is an object that aggregates statistics, and can summarize them in | 5 // Histogram is an object that aggregates statistics, and can summarize them in |
| 6 // various forms, including ASCII graphical, HTML, and numerically (as a | 6 // various forms, including ASCII graphical, HTML, and numerically (as a |
| 7 // vector of numbers corresponding to each of the aggregating buckets). | 7 // vector of numbers corresponding to each of the aggregating buckets). |
| 8 // See header file for details and examples. | 8 // See header file for details and examples. |
| 9 | 9 |
| 10 #include "base/metrics/histogram.h" | 10 #include "base/metrics/histogram.h" |
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| 125 | 125 |
| 126 HistogramBase* Histogram::FactoryTimeGet(const string& name, | 126 HistogramBase* Histogram::FactoryTimeGet(const string& name, |
| 127 TimeDelta minimum, | 127 TimeDelta minimum, |
| 128 TimeDelta maximum, | 128 TimeDelta maximum, |
| 129 size_t bucket_count, | 129 size_t bucket_count, |
| 130 int32 flags) { | 130 int32 flags) { |
| 131 return FactoryGet(name, minimum.InMilliseconds(), maximum.InMilliseconds(), | 131 return FactoryGet(name, minimum.InMilliseconds(), maximum.InMilliseconds(), |
| 132 bucket_count, flags); | 132 bucket_count, flags); |
| 133 } | 133 } |
| 134 | 134 |
| 135 TimeTicks Histogram::DebugNow() { | |
| 136 #ifndef NDEBUG | |
| 137 return TimeTicks::Now(); | |
| 138 #else | |
| 139 return TimeTicks(); | |
| 140 #endif | |
| 141 } | |
| 142 | |
| 143 // Calculate what range of values are held in each bucket. | 135 // Calculate what range of values are held in each bucket. |
| 144 // We have to be careful that we don't pick a ratio between starting points in | 136 // We have to be careful that we don't pick a ratio between starting points in |
| 145 // consecutive buckets that is sooo small, that the integer bounds are the same | 137 // consecutive buckets that is sooo small, that the integer bounds are the same |
| 146 // (effectively making one bucket get no values). We need to avoid: | 138 // (effectively making one bucket get no values). We need to avoid: |
| 147 // ranges(i) == ranges(i + 1) | 139 // ranges(i) == ranges(i + 1) |
| 148 // To avoid that, we just do a fine-grained bucket width as far as we need to | 140 // To avoid that, we just do a fine-grained bucket width as far as we need to |
| 149 // until we get a ratio that moves us along at least 2 units at a time. From | 141 // until we get a ratio that moves us along at least 2 units at a time. From |
| 150 // that bucket onward we do use the exponential growth of buckets. | 142 // that bucket onward we do use the exponential growth of buckets. |
| 151 // | 143 // |
| 152 // static | 144 // static |
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| 843 | 835 |
| 844 BucketRanges* bucket_ranges = new BucketRanges(ranges.size()); | 836 BucketRanges* bucket_ranges = new BucketRanges(ranges.size()); |
| 845 for (size_t i = 0; i < ranges.size(); i++) { | 837 for (size_t i = 0; i < ranges.size(); i++) { |
| 846 bucket_ranges->set_range(i, ranges[i]); | 838 bucket_ranges->set_range(i, ranges[i]); |
| 847 } | 839 } |
| 848 bucket_ranges->ResetChecksum(); | 840 bucket_ranges->ResetChecksum(); |
| 849 return bucket_ranges; | 841 return bucket_ranges; |
| 850 } | 842 } |
| 851 | 843 |
| 852 } // namespace base | 844 } // namespace base |
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