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internal	[ DIR ]	drwxr-xr-x
allocation.h	11.61 KB	-rw-r--r--
common.h	643 B	-rw-r--r--
cross-thread-persistent.h	14.81 KB	-rw-r--r--
custom-space.h	2.4 KB	-rw-r--r--
default-platform.h	2.18 KB	-rw-r--r--
ephemeron-pair.h	804 B	-rw-r--r--
explicit-management.h	3.29 KB	-rw-r--r--
garbage-collected.h	3.11 KB	-rw-r--r--
heap-consistency.h	11.74 KB	-rw-r--r--
heap-handle.h	1.26 KB	-rw-r--r--
heap-state.h	2.57 KB	-rw-r--r--
heap-statistics.h	3.89 KB	-rw-r--r--
heap.h	5.7 KB	-rw-r--r--
liveness-broker.h	2.34 KB	-rw-r--r--
macros.h	1.31 KB	-rw-r--r--
member.h	22.75 KB	-rw-r--r--
name-provider.h	1.99 KB	-rw-r--r--
object-size-trait.h	1.6 KB	-rw-r--r--
persistent.h	13.5 KB	-rw-r--r--
platform.h	5.56 KB	-rw-r--r--
prefinalizer.h	2.88 KB	-rw-r--r--
process-heap-statistics.h	1009 B	-rw-r--r--
sentinel-pointer.h	935 B	-rw-r--r--
source-location.h	2.57 KB	-rw-r--r--
testing.h	2.96 KB	-rw-r--r--
trace-trait.h	3.14 KB	-rw-r--r--
type-traits.h	7.78 KB	-rw-r--r--
visitor.h	14.84 KB	-rw-r--r--

Code Editor : heap-statistics.h

// 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_

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Code Editor : heap-statistics.h