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Diffstat (limited to 'third_party/abseil-cpp/absl/strings/internal/cordz_statistics.h')
-rw-r--r-- | third_party/abseil-cpp/absl/strings/internal/cordz_statistics.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/abseil-cpp/absl/strings/internal/cordz_statistics.h b/third_party/abseil-cpp/absl/strings/internal/cordz_statistics.h new file mode 100644 index 0000000000..da4c7dbb8c --- /dev/null +++ b/third_party/abseil-cpp/absl/strings/internal/cordz_statistics.h @@ -0,0 +1,87 @@ +// Copyright 2019 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#ifndef ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_ +#define ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_ + +#include <cstdint> + +#include "absl/base/config.h" +#include "absl/strings/internal/cordz_update_tracker.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace cord_internal { + +// CordzStatistics captures some meta information about a Cord's shape. +struct CordzStatistics { + using MethodIdentifier = CordzUpdateTracker::MethodIdentifier; + + // Node counts information + struct NodeCounts { + size_t flat = 0; // #flats + size_t flat_64 = 0; // #flats up to 64 bytes + size_t flat_128 = 0; // #flats up to 128 bytes + size_t flat_256 = 0; // #flats up to 256 bytes + size_t flat_512 = 0; // #flats up to 512 bytes + size_t flat_1k = 0; // #flats up to 1K bytes + size_t external = 0; // #external reps + size_t substring = 0; // #substring reps + size_t concat = 0; // #concat reps + size_t ring = 0; // #ring buffer reps + size_t btree = 0; // #btree reps + }; + + // The size of the cord in bytes. This matches the result of Cord::size(). + int64_t size = 0; + + // The estimated memory used by the sampled cord. This value matches the + // value as reported by Cord::EstimatedMemoryUsage(). + // A value of 0 implies the property has not been recorded. + int64_t estimated_memory_usage = 0; + + // The effective memory used by the sampled cord, inversely weighted by the + // effective indegree of each allocated node. This is a representation of the + // fair share of memory usage that should be attributed to the sampled cord. + // This value is more useful for cases where one or more nodes are referenced + // by multiple Cord instances, and for cases where a Cord includes the same + // node multiple times (either directly or indirectly). + // A value of 0 implies the property has not been recorded. + int64_t estimated_fair_share_memory_usage = 0; + + // The total number of nodes referenced by this cord. + // For ring buffer Cords, this includes the 'ring buffer' node. + // For btree Cords, this includes all 'CordRepBtree' tree nodes as well as all + // the substring, flat and external nodes referenced by the tree. + // A value of 0 implies the property has not been recorded. + int64_t node_count = 0; + + // Detailed node counts per type + NodeCounts node_counts; + + // The cord method responsible for sampling the cord. + MethodIdentifier method = MethodIdentifier::kUnknown; + + // The cord method responsible for sampling the parent cord if applicable. + MethodIdentifier parent_method = MethodIdentifier::kUnknown; + + // Update tracker tracking invocation count per cord method. + CordzUpdateTracker update_tracker; +}; + +} // namespace cord_internal +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_STRINGS_INTERNAL_CORDZ_STATISTICS_H_ |