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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 "base/trace_event/malloc_dump_provider.h"
#include <stddef.h>
#include "base/allocator/allocator_extension.h"
#include "base/trace_event/process_memory_dump.h"
#include "build/build_config.h"
#if defined(OS_MACOSX)
#include <malloc/malloc.h>
#else
#include <malloc.h>
#endif
namespace base {
namespace trace_event {
// static
const char MallocDumpProvider::kAllocatedObjects[] = "malloc/allocated_objects";
// static
MallocDumpProvider* MallocDumpProvider::GetInstance() {
return Singleton<MallocDumpProvider,
LeakySingletonTraits<MallocDumpProvider>>::get();
}
MallocDumpProvider::MallocDumpProvider() {}
MallocDumpProvider::~MallocDumpProvider() {}
// Called at trace dump point time. Creates a snapshot the memory counters for
// the current process.
bool MallocDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
ProcessMemoryDump* pmd) {
size_t total_virtual_size = 0;
size_t resident_size = 0;
size_t allocated_objects_size = 0;
#if defined(USE_TCMALLOC)
bool res =
allocator::GetNumericProperty("generic.heap_size", &total_virtual_size);
DCHECK(res);
res = allocator::GetNumericProperty("generic.total_physical_bytes",
&resident_size);
DCHECK(res);
res = allocator::GetNumericProperty("generic.current_allocated_bytes",
&allocated_objects_size);
DCHECK(res);
#elif defined(OS_MACOSX) || defined(OS_IOS)
malloc_statistics_t stats = {0};
malloc_zone_statistics(nullptr, &stats);
total_virtual_size = stats.size_allocated;
allocated_objects_size = stats.size_in_use;
// The resident size is approximated to the max size in use, which would count
// the total size of all regions other than the free bytes at the end of each
// region. In each allocation region the allocations are rounded off to a
// fixed quantum, so the excess region will not be resident.
// See crrev.com/1531463004 for detailed explanation.
resident_size = stats.max_size_in_use;
#else
struct mallinfo info = mallinfo();
DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
// In case of Android's jemalloc |arena| is 0 and the outer pages size is
// reported by |hblkhd|. In case of dlmalloc the total is given by
// |arena| + |hblkhd|. For more details see link: http://goo.gl/fMR8lF.
total_virtual_size = info.arena + info.hblkhd;
resident_size = info.uordblks;
allocated_objects_size = info.uordblks;
#endif
MemoryAllocatorDump* outer_dump = pmd->CreateAllocatorDump("malloc");
outer_dump->AddScalar("virtual_size", MemoryAllocatorDump::kUnitsBytes,
total_virtual_size);
outer_dump->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes, resident_size);
// Total allocated space is given by |uordblks|.
MemoryAllocatorDump* inner_dump = pmd->CreateAllocatorDump(kAllocatedObjects);
inner_dump->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes,
allocated_objects_size);
if (resident_size - allocated_objects_size > 0) {
// Explicitly specify why is extra memory resident. In tcmalloc it accounts
// for free lists and caches. In mac and ios it accounts for the
// fragmentation and metadata.
MemoryAllocatorDump* other_dump =
pmd->CreateAllocatorDump("malloc/metadata_fragmentation_caches");
other_dump->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes,
resident_size - allocated_objects_size);
}
return true;
}
} // namespace trace_event
} // namespace base
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