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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef INCLUDE_CPPGC_HEAP_STATISTICS_H_
#define INCLUDE_CPPGC_HEAP_STATISTICS_H_
#include <cstddef>
#include <cstdint>
#include <string>
#include <vector>
namespace cppgc {
/**
* `HeapStatistics` contains memory consumption and utilization statistics for a
* cppgc heap.
*/
struct HeapStatistics final {
/**
* Specifies the detail level of the heap statistics. Brief statistics contain
* only the top-level allocated and used memory statistics for the entire
* heap. Detailed statistics also contain a break down per space and page, as
* well as freelist statistics and object type histograms. Note that used
* memory reported by brief statistics and detailed statistics might differ
* slightly.
*/
enum DetailLevel : uint8_t {
kBrief,
kDetailed,
};
/**
* Object statistics for a single type.
*/
struct ObjectStatsEntry {
/**
* Number of allocated bytes.
*/
size_t allocated_bytes;
/**
* Number of allocated objects.
*/
size_t object_count;
};
/**
* Page granularity statistics. For each page the statistics record the
* allocated memory size and overall used memory size for the page.
*/
struct PageStatistics {
/** Overall committed amount of memory for the page. */
size_t committed_size_bytes = 0;
/** Resident amount of memory held by the page. */
size_t resident_size_bytes = 0;
/** Amount of memory actually used on the page. */
size_t used_size_bytes = 0;
/** Statistics for object allocated on the page. Filled only when
* NameProvider::SupportsCppClassNamesAsObjectNames() is true. */
std::vector<ObjectStatsEntry> object_statistics;
};
/**
* Statistics of the freelist (used only in non-large object spaces). For
* each bucket in the freelist the statistics record the bucket size, the
* number of freelist entries in the bucket, and the overall allocated memory
* consumed by these freelist entries.
*/
struct FreeListStatistics {
/** bucket sizes in the freelist. */
std::vector<size_t> bucket_size;
/** number of freelist entries per bucket. */
std::vector<size_t> free_count;
/** memory size consumed by freelist entries per size. */
std::vector<size_t> free_size;
};
/**
* Space granularity statistics. For each space the statistics record the
* space name, the amount of allocated memory and overall used memory for the
* space. The statistics also contain statistics for each of the space's
* pages, its freelist and the objects allocated on the space.
*/
struct SpaceStatistics {
/** The space name */
std::string name;
/** Overall committed amount of memory for the heap. */
size_t committed_size_bytes = 0;
/** Resident amount of memory held by the heap. */
size_t resident_size_bytes = 0;
/** Amount of memory actually used on the space. */
size_t used_size_bytes = 0;
/** Statistics for each of the pages in the space. */
std::vector<PageStatistics> page_stats;
/** Statistics for the freelist of the space. */
FreeListStatistics free_list_stats;
};
/** Overall committed amount of memory for the heap. */
size_t committed_size_bytes = 0;
/** Resident amount of memory held by the heap. */
size_t resident_size_bytes = 0;
/** Amount of memory actually used on the heap. */
size_t used_size_bytes = 0;
/** Detail level of this HeapStatistics. */
DetailLevel detail_level;
/** Statistics for each of the spaces in the heap. Filled only when
* `detail_level` is `DetailLevel::kDetailed`. */
std::vector<SpaceStatistics> space_stats;
/**
* Vector of `cppgc::GarbageCollected` type names.
*/
std::vector<std::string> type_names;
};
} // namespace cppgc
#endif // INCLUDE_CPPGC_HEAP_STATISTICS_H_
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| internal | Folder | 0755 |
|
|
| allocation.h | File | 11.61 KB | 0644 |
|
| common.h | File | 643 B | 0644 |
|
| cross-thread-persistent.h | File | 14.81 KB | 0644 |
|
| custom-space.h | File | 2.4 KB | 0644 |
|
| default-platform.h | File | 2.18 KB | 0644 |
|
| ephemeron-pair.h | File | 804 B | 0644 |
|
| explicit-management.h | File | 3.29 KB | 0644 |
|
| garbage-collected.h | File | 3.11 KB | 0644 |
|
| heap-consistency.h | File | 11.74 KB | 0644 |
|
| heap-handle.h | File | 1.26 KB | 0644 |
|
| heap-state.h | File | 2.57 KB | 0644 |
|
| heap-statistics.h | File | 3.89 KB | 0644 |
|
| heap.h | File | 5.7 KB | 0644 |
|
| liveness-broker.h | File | 2.34 KB | 0644 |
|
| macros.h | File | 1.31 KB | 0644 |
|
| member.h | File | 23.55 KB | 0644 |
|
| name-provider.h | File | 1.99 KB | 0644 |
|
| object-size-trait.h | File | 1.6 KB | 0644 |
|
| persistent.h | File | 13.61 KB | 0644 |
|
| platform.h | File | 5.9 KB | 0644 |
|
| prefinalizer.h | File | 2.88 KB | 0644 |
|
| process-heap-statistics.h | File | 1009 B | 0644 |
|
| sentinel-pointer.h | File | 1.18 KB | 0644 |
|
| source-location.h | File | 414 B | 0644 |
|
| testing.h | File | 2.96 KB | 0644 |
|
| trace-trait.h | File | 3.4 KB | 0644 |
|
| type-traits.h | File | 8.45 KB | 0644 |
|
| visitor.h | File | 18.08 KB | 0644 |
|