Embed a single sample in histogram metadata.

base/metrics/histogram.cc

 // 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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 // See header file for details and examples.
 
 #include "base/metrics/histogram.h"
@@ skipping 258 matching lines @@
                                          int32_t flags) {
   return FactoryTimeGet(std::string(name), minimum, maximum, bucket_count,
                         flags);
 }
 
 std::unique_ptr<HistogramBase> Histogram::PersistentCreate(
     const std::string& name,
     Sample minimum,
     Sample maximum,
     const BucketRanges* ranges,
-    HistogramBase::AtomicCount* counts,
-    HistogramBase::AtomicCount* logged_counts,
-    uint32_t counts_size,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
     HistogramSamples::Metadata* meta,
     HistogramSamples::Metadata* logged_meta) {
   return WrapUnique(new Histogram(name, minimum, maximum, ranges, counts,
-                                  logged_counts, counts_size, meta,
-                                  logged_meta));
+                                  logged_counts, meta, logged_meta));
 }
 
 // Calculate what range of values are held in each bucket.
 // We have to be careful that we don't pick a ratio between starting points in
 // consecutive buckets that is sooo small, that the integer bounds are the same
 // (effectively making one bucket get no values).  We need to avoid:
 //   ranges(i) == ranges(i + 1)
 // To avoid that, we just do a fine-grained bucket width as far as we need to
 // until we get a ratio that moves us along at least 2 units at a time.  From
 // that bucket onward we do use the exponential growth of buckets.
@@ skipping 227 matching lines @@
     declared_min_(minimum),
     declared_max_(maximum) {
   if (ranges)
     samples_.reset(new SampleVector(HashMetricName(name), ranges));
 }
 
 Histogram::Histogram(const std::string& name,
                      Sample minimum,
                      Sample maximum,
                      const BucketRanges* ranges,
-                     HistogramBase::AtomicCount* counts,
-                     HistogramBase::AtomicCount* logged_counts,
-                     uint32_t counts_size,
+                     const DelayedPersistentAllocation& counts,
+                     const DelayedPersistentAllocation& logged_counts,
                      HistogramSamples::Metadata* meta,
                      HistogramSamples::Metadata* logged_meta)
-  : HistogramBase(name),
-    bucket_ranges_(ranges),
-    declared_min_(minimum),
-    declared_max_(maximum) {
+    : HistogramBase(name),
+      bucket_ranges_(ranges),
+      declared_min_(minimum),
+      declared_max_(maximum) {
   if (ranges) {
-    samples_.reset(new SampleVector(HashMetricName(name),
-                                    counts, counts_size, meta, ranges));
-    logged_samples_.reset(new SampleVector(samples_->id(), logged_counts,
-                                           counts_size, logged_meta, ranges));
+    samples_.reset(
+        new PersistentSampleVector(HashMetricName(name), ranges, meta, counts));
+    logged_samples_.reset(new PersistentSampleVector(
+        samples_->id(), ranges, logged_meta, logged_counts));
   }
 }
 
 Histogram::~Histogram() {
 }
 
 bool Histogram::PrintEmptyBucket(uint32_t index) const {
   return true;
 }
 
@@ skipping 110 matching lines @@
     double current_size = GetBucketSize(current, i);
     if (graph_it)
       WriteAsciiBucketGraph(current_size, max_size, output);
     WriteAsciiBucketContext(past, current, remaining, i, output);
     output->append(newline);
     past += current;
   }
   DCHECK_EQ(sample_count, past);
 }
 
-double Histogram::GetPeakBucketSize(const SampleVector& samples) const {
+double Histogram::GetPeakBucketSize(const SampleVectorBase& samples) const {
   double max = 0;
   for (uint32_t i = 0; i < bucket_count() ; ++i) {
     double current_size = GetBucketSize(samples.GetCountAtIndex(i), i);
     if (current_size > max)
       max = current_size;
   }
   return max;
 }
 
-void Histogram::WriteAsciiHeader(const SampleVector& samples,
+void Histogram::WriteAsciiHeader(const SampleVectorBase& samples,
                                  Count sample_count,
                                  std::string* output) const {
   StringAppendF(output,
                 "Histogram: %s recorded %d samples",
                 histogram_name().c_str(),
                 sample_count);
   if (sample_count == 0) {
     DCHECK_EQ(samples.sum(), 0);
   } else {
     double mean = static_cast<float>(samples.sum()) / sample_count;
@@ skipping 128 matching lines @@
                                                int32_t flags) {
   return FactoryTimeGet(std::string(name),  minimum, maximum, bucket_count,
                         flags);
 }
 
 std::unique_ptr<HistogramBase> LinearHistogram::PersistentCreate(
     const std::string& name,
     Sample minimum,
     Sample maximum,
     const BucketRanges* ranges,
-    HistogramBase::AtomicCount* counts,
-    HistogramBase::AtomicCount* logged_counts,
-    uint32_t counts_size,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
     HistogramSamples::Metadata* meta,
     HistogramSamples::Metadata* logged_meta) {
-  return WrapUnique(new LinearHistogram(name, minimum, maximum, ranges,
-                                              counts, logged_counts,
-                                              counts_size, meta, logged_meta));
+  return WrapUnique(new LinearHistogram(name, minimum, maximum, ranges, counts,
+                                        logged_counts, meta, logged_meta));
 }
 
 HistogramBase* LinearHistogram::FactoryGetWithRangeDescription(
     const std::string& name,
     Sample minimum,
     Sample maximum,
     uint32_t bucket_count,
     int32_t flags,
     const DescriptionPair descriptions[]) {
   bool valid_arguments = Histogram::InspectConstructionArguments(
       name, &minimum, &maximum, &bucket_count);
   DCHECK(valid_arguments);
 
   return Factory(name, minimum, maximum, bucket_count, flags, descriptions)
       .Build();
 }
 
 HistogramType LinearHistogram::GetHistogramType() const {
   return LINEAR_HISTOGRAM;
 }
 
 LinearHistogram::LinearHistogram(const std::string& name,
                                  Sample minimum,
                                  Sample maximum,
                                  const BucketRanges* ranges)
     : Histogram(name, minimum, maximum, ranges) {
 }
 
-LinearHistogram::LinearHistogram(const std::string& name,
-                                 Sample minimum,
-                                 Sample maximum,
-                                 const BucketRanges* ranges,
-                                 HistogramBase::AtomicCount* counts,
-                                 HistogramBase::AtomicCount* logged_counts,
-                                 uint32_t counts_size,
-                                 HistogramSamples::Metadata* meta,
-                                 HistogramSamples::Metadata* logged_meta)
-    : Histogram(name, minimum, maximum, ranges, counts, logged_counts,
-                counts_size, meta, logged_meta) {}
+LinearHistogram::LinearHistogram(
+    const std::string& name,
+    Sample minimum,
+    Sample maximum,
+    const BucketRanges* ranges,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
+    HistogramSamples::Metadata* meta,
+    HistogramSamples::Metadata* logged_meta)
+    : Histogram(name,
+                minimum,
+                maximum,
+                ranges,
+                counts,
+                logged_counts,
+                meta,
+                logged_meta) {}
 
 double LinearHistogram::GetBucketSize(Count current, uint32_t i) const {
   DCHECK_GT(ranges(i + 1), ranges(i));
   // Adjacent buckets with different widths would have "surprisingly" many (few)
   // samples in a histogram if we didn't normalize this way.
   double denominator = ranges(i + 1) - ranges(i);
   return current/denominator;
 }
 
 const std::string LinearHistogram::GetAsciiBucketRange(uint32_t i) const {
@@ skipping 79 matching lines @@
   return Factory(name, flags).Build();
 }
 
 HistogramBase* BooleanHistogram::FactoryGet(const char* name, int32_t flags) {
   return FactoryGet(std::string(name), flags);
 }
 
 std::unique_ptr<HistogramBase> BooleanHistogram::PersistentCreate(
     const std::string& name,
     const BucketRanges* ranges,
-    HistogramBase::AtomicCount* counts,
-    HistogramBase::AtomicCount* logged_counts,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
     HistogramSamples::Metadata* meta,
     HistogramSamples::Metadata* logged_meta) {
-  return WrapUnique(new BooleanHistogram(
-      name, ranges, counts, logged_counts, meta, logged_meta));
+  return WrapUnique(new BooleanHistogram(name, ranges, counts, logged_counts,
+                                         meta, logged_meta));
 }
 
 HistogramType BooleanHistogram::GetHistogramType() const {
   return BOOLEAN_HISTOGRAM;
 }
 
 BooleanHistogram::BooleanHistogram(const std::string& name,
                                    const BucketRanges* ranges)
     : LinearHistogram(name, 1, 2, ranges) {}
 
-BooleanHistogram::BooleanHistogram(const std::string& name,
-                                   const BucketRanges* ranges,
-                                   HistogramBase::AtomicCount* counts,
-                                   HistogramBase::AtomicCount* logged_counts,
-                                   HistogramSamples::Metadata* meta,
-                                   HistogramSamples::Metadata* logged_meta)
-    : LinearHistogram(name, 1, 2, ranges, counts, logged_counts, 2, meta,
+BooleanHistogram::BooleanHistogram(
+    const std::string& name,
+    const BucketRanges* ranges,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
+    HistogramSamples::Metadata* meta,
+    HistogramSamples::Metadata* logged_meta)
+    : LinearHistogram(name,
+                      1,
+                      2,
+                      ranges,
+                      counts,
+                      logged_counts,
+                      meta,
                       logged_meta) {}
 
 HistogramBase* BooleanHistogram::DeserializeInfoImpl(PickleIterator* iter) {
   std::string histogram_name;
   int flags;
   int declared_min;
   int declared_max;
   uint32_t bucket_count;
   uint32_t range_checksum;
 
@@ skipping 64 matching lines @@
 HistogramBase* CustomHistogram::FactoryGet(
     const char* name,
     const std::vector<Sample>& custom_ranges,
     int32_t flags) {
   return FactoryGet(std::string(name), custom_ranges, flags);
 }
 
 std::unique_ptr<HistogramBase> CustomHistogram::PersistentCreate(
     const std::string& name,
     const BucketRanges* ranges,
-    HistogramBase::AtomicCount* counts,
-    HistogramBase::AtomicCount* logged_counts,
-    uint32_t counts_size,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
     HistogramSamples::Metadata* meta,
     HistogramSamples::Metadata* logged_meta) {
-  return WrapUnique(new CustomHistogram(
-      name, ranges, counts, logged_counts, counts_size, meta, logged_meta));
+  return WrapUnique(new CustomHistogram(name, ranges, counts, logged_counts,
+                                        meta, logged_meta));
 }
 
 HistogramType CustomHistogram::GetHistogramType() const {
   return CUSTOM_HISTOGRAM;
 }
 
 // static
 std::vector<Sample> CustomHistogram::ArrayToCustomRanges(
     const Sample* values, uint32_t num_values) {
   std::vector<Sample> all_values;
   for (uint32_t i = 0; i < num_values; ++i) {
     Sample value = values[i];
     all_values.push_back(value);
 
     // Ensure that a guard bucket is added. If we end up with duplicate
     // values, FactoryGet will take care of removing them.
     all_values.push_back(value + 1);
   }
   return all_values;
 }
 
 CustomHistogram::CustomHistogram(const std::string& name,
                                  const BucketRanges* ranges)
     : Histogram(name,
                 ranges->range(1),
                 ranges->range(ranges->bucket_count() - 1),
                 ranges) {}
 
-CustomHistogram::CustomHistogram(const std::string& name,
-                                 const BucketRanges* ranges,
-                                 HistogramBase::AtomicCount* counts,
-                                 HistogramBase::AtomicCount* logged_counts,
-                                 uint32_t counts_size,
-                                 HistogramSamples::Metadata* meta,
-                                 HistogramSamples::Metadata* logged_meta)
+CustomHistogram::CustomHistogram(
+    const std::string& name,
+    const BucketRanges* ranges,
+    const DelayedPersistentAllocation& counts,
+    const DelayedPersistentAllocation& logged_counts,
+    HistogramSamples::Metadata* meta,
+    HistogramSamples::Metadata* logged_meta)
     : Histogram(name,
                 ranges->range(1),
                 ranges->range(ranges->bucket_count() - 1),
                 ranges,
                 counts,
                 logged_counts,
-                counts_size,
                 meta,
                 logged_meta) {}
 
 bool CustomHistogram::SerializeInfoImpl(Pickle* pickle) const {
   if (!Histogram::SerializeInfoImpl(pickle))
     return false;
 
   // Serialize ranges. First and last ranges are alwasy 0 and INT_MAX, so don't
   // write them.
   for (uint32_t i = 1; i < bucket_ranges()->bucket_count(); ++i) {
@@ skipping 48 matching lines @@
     Sample sample = custom_ranges[i];
     if (sample < 0 || sample > HistogramBase::kSampleType_MAX - 1)
       return false;
     if (sample != 0)
       has_valid_range = true;
   }
   return has_valid_range;
 }
 
 }  // namespace base