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// Copyright 2015 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.
#include <stddef.h>
#include <map>
#include <unordered_map>
#include <vector>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/trace_event/heap_profiler_allocation_context.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/memory_allocator_dump_guid.h"
#include "base/trace_event/memory_dump_request_args.h"
#include "build/build_config.h"
// Define COUNT_RESIDENT_BYTES_SUPPORTED if platform supports counting of the
// resident memory.
#if !defined(OS_NACL)
namespace base {
class SharedMemory;
class UnguessableToken;
namespace trace_event {
class TracedValue;
// ProcessMemoryDump is as a strongly typed container which holds the dumps
// produced by the MemoryDumpProvider(s) for a specific process.
class BASE_EXPORT ProcessMemoryDump {
struct BASE_EXPORT MemoryAllocatorDumpEdge {
bool operator==(const MemoryAllocatorDumpEdge&) const;
bool operator!=(const MemoryAllocatorDumpEdge&) const;
MemoryAllocatorDumpGuid source;
MemoryAllocatorDumpGuid target;
int importance = 0;
bool overridable = false;
// Maps allocator dumps absolute names (allocator_name/heap/subheap) to
// MemoryAllocatorDump instances.
using AllocatorDumpsMap =
std::map<std::string, std::unique_ptr<MemoryAllocatorDump>>;
// Stores allocator dump edges indexed by source allocator dump GUID.
using AllocatorDumpEdgesMap =
std::map<MemoryAllocatorDumpGuid, MemoryAllocatorDumpEdge>;
// Returns the number of bytes in a kernel memory page. Some platforms may
// have a different value for kernel page sizes from user page sizes. It is
// important to use kernel memory page sizes for resident bytes calculation.
// In most cases, the two are the same.
static size_t GetSystemPageSize();
// Returns the total bytes resident for a virtual address range, with given
// |start_address| and |mapped_size|. |mapped_size| is specified in bytes. The
// value returned is valid only if the given range is currently mmapped by the
// process. The |start_address| must be page-aligned.
static size_t CountResidentBytes(void* start_address, size_t mapped_size);
// The same as above, but the given mapped range should belong to the
// shared_memory's mapped region.
static base::Optional<size_t> CountResidentBytesInSharedMemory(
void* start_address,
size_t mapped_size);
explicit ProcessMemoryDump(const MemoryDumpArgs& dump_args);
ProcessMemoryDump& operator=(ProcessMemoryDump&&);
// Creates a new MemoryAllocatorDump with the given name and returns the
// empty object back to the caller.
// Arguments:
// absolute_name: a name that uniquely identifies allocator dumps produced
// by this provider. It is possible to specify nesting by using a
// path-like string (e.g., v8/isolate1/heap1, v8/isolate1/heap2).
// Leading or trailing slashes are not allowed.
// guid: an optional identifier, unique among all processes within the
// scope of a global dump. This is only relevant when using
// AddOwnershipEdge() to express memory sharing. If omitted,
// it will be automatically generated.
// ProcessMemoryDump handles the memory ownership of its MemoryAllocatorDumps.
MemoryAllocatorDump* CreateAllocatorDump(const std::string& absolute_name);
MemoryAllocatorDump* CreateAllocatorDump(const std::string& absolute_name,
const MemoryAllocatorDumpGuid& guid);
// Looks up a MemoryAllocatorDump given its allocator and heap names, or
// nullptr if not found.
MemoryAllocatorDump* GetAllocatorDump(const std::string& absolute_name) const;
// Do NOT use this method. All dump providers should use
// CreateAllocatorDump(). Tries to create a new MemoryAllocatorDump only if it
// doesn't already exist. Creating multiple dumps with same name using
// GetOrCreateAllocatorDump() would override the existing scalars in MAD and
// cause misreporting. This method is used only in rare cases multiple
// components create allocator dumps with same name and only one of them adds
// size.
MemoryAllocatorDump* GetOrCreateAllocatorDump(
const std::string& absolute_name);
// Creates a shared MemoryAllocatorDump, to express cross-process sharing.
// Shared allocator dumps are allowed to have duplicate guids within the
// global scope, in order to reference the same dump from multiple processes.
// See the design doc for reference usage patterns.
MemoryAllocatorDump* CreateSharedGlobalAllocatorDump(
const MemoryAllocatorDumpGuid& guid);
// Creates a shared MemoryAllocatorDump as CreateSharedGlobalAllocatorDump,
// but with a WEAK flag. A weak dump will be discarded unless a non-weak dump
// is created using CreateSharedGlobalAllocatorDump by at least one process.
// The WEAK flag does not apply if a non-weak dump with the same GUID already
// exists or is created later. All owners and children of the discarded dump
// will also be discarded transitively.
MemoryAllocatorDump* CreateWeakSharedGlobalAllocatorDump(
const MemoryAllocatorDumpGuid& guid);
// Looks up a shared MemoryAllocatorDump given its guid.
MemoryAllocatorDump* GetSharedGlobalAllocatorDump(
const MemoryAllocatorDumpGuid& guid) const;
// Returns the map of the MemoryAllocatorDumps added to this dump.
const AllocatorDumpsMap& allocator_dumps() const { return allocator_dumps_; }
AllocatorDumpsMap* mutable_allocator_dumps_for_serialization() const {
// Mojo takes a const input argument even for move-only types that can be
// mutate while serializing (like this one). Hence the const_cast.
return const_cast<AllocatorDumpsMap*>(&allocator_dumps_);
void SetAllocatorDumpsForSerialization(
// Only for mojo serialization.
std::vector<MemoryAllocatorDumpEdge> GetAllEdgesForSerialization() const;
void SetAllEdgesForSerialization(const std::vector<MemoryAllocatorDumpEdge>&);
// Dumps heap usage with |allocator_name|.
void DumpHeapUsage(
const std::unordered_map<base::trace_event::AllocationContext,
base::trace_event::TraceEventMemoryOverhead& overhead,
const char* allocator_name);
// Adds an ownership relationship between two MemoryAllocatorDump(s) with the
// semantics: |source| owns |target|, and has the effect of attributing
// the memory usage of |target| to |source|. |importance| is optional and
// relevant only for the cases of co-ownership, where it acts as a z-index:
// the owner with the highest importance will be attributed |target|'s memory.
// If an edge is present, its importance will not be updated unless
// |importance| is larger.
void AddOwnershipEdge(const MemoryAllocatorDumpGuid& source,
const MemoryAllocatorDumpGuid& target,
int importance);
void AddOwnershipEdge(const MemoryAllocatorDumpGuid& source,
const MemoryAllocatorDumpGuid& target);
// Adds edges that can be overriden by a later or earlier call to
// AddOwnershipEdge() with the same source and target with a different
// |importance| value.
void AddOverridableOwnershipEdge(const MemoryAllocatorDumpGuid& source,
const MemoryAllocatorDumpGuid& target,
int importance);
// Creates ownership edges for memory backed by base::SharedMemory. Handles
// the case of cross process sharing and importnace of ownership for the case
// with and without the base::SharedMemory dump provider. The new version
// should just use global dumps created by SharedMemoryTracker and this
// function handles the transition until we get SharedMemory IDs through mojo
// channel The weak version creates a weak global dump.
// |client_local_dump_guid| The guid of the local dump created by the client
// of base::SharedMemory.
// |shared_memory_guid| The ID of the base::SharedMemory that is assigned
// globally, used to create global dump edges in the new model.
// |importance| Importance of the global dump edges to say if the current
// process owns the memory segment.
void CreateSharedMemoryOwnershipEdge(
const MemoryAllocatorDumpGuid& client_local_dump_guid,
const UnguessableToken& shared_memory_guid,
int importance);
void CreateWeakSharedMemoryOwnershipEdge(
const MemoryAllocatorDumpGuid& client_local_dump_guid,
const UnguessableToken& shared_memory_guid,
int importance);
const AllocatorDumpEdgesMap& allocator_dumps_edges() const {
return allocator_dumps_edges_;
// Utility method to add a suballocation relationship with the following
// semantics: |source| is suballocated from |target_node_name|.
// This creates a child node of |target_node_name| and adds an ownership edge
// between |source| and the new child node. As a result, the UI will not
// account the memory of |source| in the target node.
void AddSuballocation(const MemoryAllocatorDumpGuid& source,
const std::string& target_node_name);
// Removes all the MemoryAllocatorDump(s) contained in this instance. This
// ProcessMemoryDump can be safely reused as if it was new once this returns.
void Clear();
// Merges all MemoryAllocatorDump(s) contained in |other| inside this
// ProcessMemoryDump, transferring their ownership to this instance.
// |other| will be an empty ProcessMemoryDump after this method returns.
// This is to allow dump providers to pre-populate ProcessMemoryDump instances
// and later move their contents into the ProcessMemoryDump passed as argument
// of the MemoryDumpProvider::OnMemoryDump(ProcessMemoryDump*) callback.
void TakeAllDumpsFrom(ProcessMemoryDump* other);
// Populate the traced value with information about the memory allocator
// dumps.
void SerializeAllocatorDumpsInto(TracedValue* value) const;
const MemoryDumpArgs& dump_args() const { return dump_args_; }
FRIEND_TEST_ALL_PREFIXES(ProcessMemoryDumpTest, BackgroundModeTest);
FRIEND_TEST_ALL_PREFIXES(ProcessMemoryDumpTest, SharedMemoryOwnershipTest);
FRIEND_TEST_ALL_PREFIXES(ProcessMemoryDumpTest, GuidsTest);
MemoryAllocatorDump* AddAllocatorDumpInternal(
std::unique_ptr<MemoryAllocatorDump> mad);
// A per-process token, valid throughout all the lifetime of the current
// process, used to disambiguate dumps with the same name generated in
// different processes.
const UnguessableToken& process_token() const { return process_token_; }
void set_process_token_for_testing(UnguessableToken token) {
process_token_ = token;
// Returns the Guid of the dump for the given |absolute_name| for
// for the given process' token. |process_token| is used to disambiguate GUIDs
// derived from the same name under different processes.
MemoryAllocatorDumpGuid GetDumpId(const std::string& absolute_name);
void CreateSharedMemoryOwnershipEdgeInternal(
const MemoryAllocatorDumpGuid& client_local_dump_guid,
const UnguessableToken& shared_memory_guid,
int importance,
bool is_weak);
MemoryAllocatorDump* GetBlackHoleMad();
UnguessableToken process_token_;
AllocatorDumpsMap allocator_dumps_;
// Keeps track of relationships between MemoryAllocatorDump(s).
AllocatorDumpEdgesMap allocator_dumps_edges_;
// Level of detail of the current dump.
MemoryDumpArgs dump_args_;
// This allocator dump is returned when an invalid dump is created in
// background mode. The attributes of the dump are ignored and not added to
// the trace.
std::unique_ptr<MemoryAllocatorDump> black_hole_mad_;
// When set to true, the DCHECK(s) for invalid dump creations on the
// background mode are disabled for testing.
static bool is_black_hole_non_fatal_for_testing_;
} // namespace trace_event
} // namespace base