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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 #include "base/metrics/histogram_snapshot_manager.h" | 5 #include "base/metrics/histogram_snapshot_manager.h" |
6 | 6 |
7 #include "base/memory/scoped_ptr.h" | 7 #include "base/memory/scoped_ptr.h" |
8 #include "base/metrics/histogram_flattener.h" | 8 #include "base/metrics/histogram_flattener.h" |
9 #include "base/metrics/histogram_samples.h" | 9 #include "base/metrics/histogram_samples.h" |
10 #include "base/metrics/statistics_recorder.h" | 10 #include "base/metrics/statistics_recorder.h" |
11 #include "base/stl_util.h" | 11 #include "base/stl_util.h" |
12 | 12 |
13 using std::map; | 13 using std::map; |
14 using std::string; | 14 using std::string; |
15 | 15 |
16 namespace base { | 16 namespace base { |
17 | 17 |
18 HistogramSnapshotManager::HistogramSnapshotManager( | 18 HistogramSnapshotManager::HistogramSnapshotManager( |
19 HistogramFlattener* histogram_flattener) | 19 HistogramFlattener* histogram_flattener) |
20 : histogram_flattener_(histogram_flattener) { | 20 : histogram_flattener_(histogram_flattener) { |
21 DCHECK(histogram_flattener_); | 21 DCHECK(histogram_flattener_); |
22 } | 22 } |
23 | 23 |
24 HistogramSnapshotManager::~HistogramSnapshotManager() { | 24 HistogramSnapshotManager::~HistogramSnapshotManager() { |
25 STLDeleteValues(&logged_samples_); | 25 STLDeleteValues(&logged_samples_); |
26 } | 26 } |
27 | 27 |
28 void HistogramSnapshotManager::PrepareDeltas(Histogram::Flags flag_to_set, | 28 void HistogramSnapshotManager::PrepareDeltas(HistogramBase::Flags flag_to_set, |
29 bool record_only_uma) { | 29 bool record_only_uma) { |
30 StatisticsRecorder::Histograms histograms; | 30 StatisticsRecorder::Histograms histograms; |
31 StatisticsRecorder::GetHistograms(&histograms); | 31 StatisticsRecorder::GetHistograms(&histograms); |
32 for (StatisticsRecorder::Histograms::const_iterator it = histograms.begin(); | 32 for (StatisticsRecorder::Histograms::const_iterator it = histograms.begin(); |
33 histograms.end() != it; | 33 histograms.end() != it; |
34 ++it) { | 34 ++it) { |
35 (*it)->SetFlags(flag_to_set); | 35 (*it)->SetFlags(flag_to_set); |
36 if (record_only_uma && | 36 if (record_only_uma && |
37 0 == ((*it)->flags() & Histogram::kUmaTargetedHistogramFlag)) | 37 0 == ((*it)->flags() & Histogram::kUmaTargetedHistogramFlag)) |
38 continue; | 38 continue; |
39 PrepareDelta(**it); | 39 PrepareDelta(**it); |
40 } | 40 } |
41 } | 41 } |
42 | 42 |
43 void HistogramSnapshotManager::PrepareDelta(const Histogram& histogram) { | 43 void HistogramSnapshotManager::PrepareDelta(const HistogramBase& histogram) { |
44 DCHECK(histogram_flattener_); | 44 DCHECK(histogram_flattener_); |
45 | 45 |
46 // Get up-to-date snapshot of sample stats. | 46 // Get up-to-date snapshot of sample stats. |
47 scoped_ptr<HistogramSamples> snapshot(histogram.SnapshotSamples()); | 47 scoped_ptr<HistogramSamples> snapshot(histogram.SnapshotSamples()); |
48 const std::string& histogram_name = histogram.histogram_name(); | 48 const std::string& histogram_name = histogram.histogram_name(); |
49 | 49 |
50 int corruption = histogram.FindCorruption(*snapshot); | 50 int corruption = histogram.FindCorruption(*snapshot); |
51 | 51 |
52 // Crash if we detect that our histograms have been overwritten. This may be | 52 // Crash if we detect that our histograms have been overwritten. This may be |
53 // a fair distance from the memory smasher, but we hope to correlate these | 53 // a fair distance from the memory smasher, but we hope to correlate these |
54 // crashes with other events, such as plugins, or usage patterns, etc. | 54 // crashes with other events, such as plugins, or usage patterns, etc. |
55 if (Histogram::BUCKET_ORDER_ERROR & corruption) { | 55 if (HistogramBase::BUCKET_ORDER_ERROR & corruption) { |
56 // The checksum should have caught this, so crash separately if it didn't. | 56 // The checksum should have caught this, so crash separately if it didn't. |
57 CHECK_NE(0, Histogram::RANGE_CHECKSUM_ERROR & corruption); | 57 CHECK_NE(0, HistogramBase::RANGE_CHECKSUM_ERROR & corruption); |
58 CHECK(false); // Crash for the bucket order corruption. | 58 CHECK(false); // Crash for the bucket order corruption. |
59 } | 59 } |
60 // Checksum corruption might not have caused order corruption. | 60 // Checksum corruption might not have caused order corruption. |
61 CHECK_EQ(0, Histogram::RANGE_CHECKSUM_ERROR & corruption); | 61 CHECK_EQ(0, HistogramBase::RANGE_CHECKSUM_ERROR & corruption); |
62 | 62 |
63 // Note, at this point corruption can only be COUNT_HIGH_ERROR or | 63 // Note, at this point corruption can only be COUNT_HIGH_ERROR or |
64 // COUNT_LOW_ERROR and they never arise together, so we don't need to extract | 64 // COUNT_LOW_ERROR and they never arise together, so we don't need to extract |
65 // bits from corruption. | 65 // bits from corruption. |
66 if (corruption) { | 66 if (corruption) { |
67 DLOG(ERROR) << "Histogram: " << histogram_name | 67 DLOG(ERROR) << "Histogram: " << histogram_name |
68 << " has data corruption: " << corruption; | 68 << " has data corruption: " << corruption; |
69 histogram_flattener_->InconsistencyDetected( | 69 histogram_flattener_->InconsistencyDetected( |
70 static_cast<Histogram::Inconsistencies>(corruption)); | 70 static_cast<HistogramBase::Inconsistency>(corruption)); |
71 // Don't record corrupt data to metrics services. | 71 // Don't record corrupt data to metrics services. |
72 int old_corruption = inconsistencies_[histogram_name]; | 72 int old_corruption = inconsistencies_[histogram_name]; |
73 if (old_corruption == (corruption | old_corruption)) | 73 if (old_corruption == (corruption | old_corruption)) |
74 return; // We've already seen this corruption for this histogram. | 74 return; // We've already seen this corruption for this histogram. |
75 inconsistencies_[histogram_name] |= corruption; | 75 inconsistencies_[histogram_name] |= corruption; |
76 histogram_flattener_->UniqueInconsistencyDetected( | 76 histogram_flattener_->UniqueInconsistencyDetected( |
77 static_cast<Histogram::Inconsistencies>(corruption)); | 77 static_cast<HistogramBase::Inconsistency>(corruption)); |
78 return; | 78 return; |
79 } | 79 } |
80 | 80 |
81 HistogramSamples* to_log; | 81 HistogramSamples* to_log; |
82 map<string, HistogramSamples*>::iterator it = | 82 map<string, HistogramSamples*>::iterator it = |
83 logged_samples_.find(histogram_name); | 83 logged_samples_.find(histogram_name); |
84 if (it == logged_samples_.end()) { | 84 if (it == logged_samples_.end()) { |
85 to_log = snapshot.release(); | 85 to_log = snapshot.release(); |
86 | 86 |
87 // This histogram has not been logged before, add a new entry. | 87 // This histogram has not been logged before, add a new entry. |
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108 | 108 |
109 histogram_flattener_->InconsistencyDetectedInLoggedCount(discrepancy); | 109 histogram_flattener_->InconsistencyDetectedInLoggedCount(discrepancy); |
110 if (discrepancy > Histogram::kCommonRaceBasedCountMismatch) { | 110 if (discrepancy > Histogram::kCommonRaceBasedCountMismatch) { |
111 // Fix logged_samples. | 111 // Fix logged_samples. |
112 logged_samples->Subtract(*logged_samples); | 112 logged_samples->Subtract(*logged_samples); |
113 logged_samples->Add(new_snapshot); | 113 logged_samples->Add(new_snapshot); |
114 } | 114 } |
115 } | 115 } |
116 | 116 |
117 } // namespace base | 117 } // namespace base |
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