blob: d020c7d652f8f919908fb60ad297757c07249d1a [file] [log] [blame]
// 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 <unordered_map>
#include <vector>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_vector.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 "base/trace_event/memory_dump_session_state.h"
#include "base/trace_event/process_memory_maps.h"
#include "base/trace_event/process_memory_totals.h"
#include "build/build_config.h"
// Define COUNT_RESIDENT_BYTES_SUPPORTED if platform supports counting of the
// resident memory.
#if (defined(OS_POSIX) && !defined(OS_NACL)) || defined(OS_WIN)
namespace base {
namespace trace_event {
class MemoryDumpManager;
class MemoryDumpSessionState;
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 MemoryAllocatorDumpEdge {
MemoryAllocatorDumpGuid source;
MemoryAllocatorDumpGuid target;
int importance;
const char* type;
// Maps allocator dumps absolute names (allocator_name/heap/subheap) to
// MemoryAllocatorDump instances.
using AllocatorDumpsMap =
std::unordered_map<std::string, std::unique_ptr<MemoryAllocatorDump>>;
using HeapDumpsMap =
std::unordered_map<std::string, std::unique_ptr<TracedValue>>;
// 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);
ProcessMemoryDump(scoped_refptr<MemoryDumpSessionState> session_state,
const MemoryDumpArgs& dump_args);
// 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;
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_; }
// Dumps heap usage with |allocator_name|.
void DumpHeapUsage(const base::hash_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.
void AddOwnershipEdge(const MemoryAllocatorDumpGuid& source,
const MemoryAllocatorDumpGuid& target,
int importance);
void AddOwnershipEdge(const MemoryAllocatorDumpGuid& source,
const MemoryAllocatorDumpGuid& target);
const std::vector<MemoryAllocatorDumpEdge>& 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);
const scoped_refptr<MemoryDumpSessionState>& session_state() const {
return session_state_;
// 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);
// Called at trace generation time to populate the TracedValue.
void AsValueInto(TracedValue* value) const;
ProcessMemoryTotals* process_totals() { return &process_totals_; }
bool has_process_totals() const { return has_process_totals_; }
void set_has_process_totals() { has_process_totals_ = true; }
ProcessMemoryMaps* process_mmaps() { return &process_mmaps_; }
bool has_process_mmaps() const { return has_process_mmaps_; }
void set_has_process_mmaps() { has_process_mmaps_ = true; }
const HeapDumpsMap& heap_dumps() const { return heap_dumps_; }
const MemoryDumpArgs& dump_args() const { return dump_args_; }
FRIEND_TEST_ALL_PREFIXES(ProcessMemoryDumpTest, BackgroundModeTest);
MemoryAllocatorDump* AddAllocatorDumpInternal(
std::unique_ptr<MemoryAllocatorDump> mad);
MemoryAllocatorDump* GetBlackHoleMad();
ProcessMemoryTotals process_totals_;
bool has_process_totals_;
ProcessMemoryMaps process_mmaps_;
bool has_process_mmaps_;
AllocatorDumpsMap allocator_dumps_;
HeapDumpsMap heap_dumps_;
// State shared among all PMDs instances created in a given trace session.
scoped_refptr<MemoryDumpSessionState> session_state_;
// Keeps track of relationships between MemoryAllocatorDump(s).
std::vector<MemoryAllocatorDumpEdge> allocator_dumps_edges_;
// Level of detail of the current dump.
const 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