Count m(un)map for each stacktrace in MemoryRegionMap instead of HeapProfileTable.

third_party/tcmalloc/chromium/src/heap-profile-table.cc

 // Copyright (c) 2006, Google Inc.
 // All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 // 
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 84 matching lines @@
 #if defined(TYPE_PROFILING)
 static const char kTypeProfileStatsHeader[] = "type statistics:\n";
 #endif  // defined(TYPE_PROFILING)
 
 //----------------------------------------------------------------------
 
 const char HeapProfileTable::kFileExt[] = ".heap";
 
 //----------------------------------------------------------------------
 
-// Size for alloc_table_ and mmap_table_.
-static const int kHashTableSize = 179999;
+static const int kHashTableSize = 179999;   // Size for bucket_table_.
 /*static*/ const int HeapProfileTable::kMaxStackDepth;
 
 //----------------------------------------------------------------------
 
 // We strip out different number of stack frames in debug mode
 // because less inlining happens in that case
 #ifdef NDEBUG
 static const int kStripFrames = 2;
 #else
 static const int kStripFrames = 3;
 #endif
 
 // For sorting Stats or Buckets by in-use space
 static bool ByAllocatedSpace(HeapProfileTable::Stats* a,
                              HeapProfileTable::Stats* b) {
   // Return true iff "a" has more allocated space than "b"
   return (a->alloc_size - a->free_size) > (b->alloc_size - b->free_size);
 }
 
 //----------------------------------------------------------------------
 
-HeapProfileTable::HeapProfileTable(Allocator alloc, DeAllocator dealloc)
+HeapProfileTable::HeapProfileTable(Allocator alloc,
+                                   DeAllocator dealloc,
+                                   bool profile_mmap)
     : alloc_(alloc),
       dealloc_(dealloc),
-      num_alloc_buckets_(0),
-      mmap_table_(NULL),
-      num_available_mmap_buckets_(0),
-      mmap_address_map_(NULL) {
-  // Initialize the overall profile stats.
+      bucket_table_(NULL),
+      profile_mmap_(profile_mmap),
+      num_buckets_(0),
+      address_map_(NULL) {
+  // Make a hash table for buckets.
+  const int table_bytes = kHashTableSize * sizeof(*bucket_table_);
+  bucket_table_ = static_cast<Bucket**>(alloc_(table_bytes));
+  memset(bucket_table_, 0, table_bytes);
+
+  // Make an allocation map.
+  address_map_ =
+      new(alloc_(sizeof(AllocationMap))) AllocationMap(alloc_, dealloc_);
+
+  // Initialize.
   memset(&total_, 0, sizeof(total_));
-
-  // Make the malloc table.
-  const int alloc_table_bytes = kHashTableSize * sizeof(*alloc_table_);
-  alloc_table_ = reinterpret_cast<Bucket**>(alloc_(alloc_table_bytes));
-  memset(alloc_table_, 0, alloc_table_bytes);
-
-  // Make malloc and mmap allocation maps.
-  alloc_address_map_ =
-      new(alloc_(sizeof(AllocationMap))) AllocationMap(alloc_, dealloc_);
+  num_buckets_ = 0;
 }
 
 HeapProfileTable::~HeapProfileTable() {
-  DeallocateBucketTable(alloc_table_);
-  alloc_table_ = NULL;
-  DeallocateBucketTable(mmap_table_);
-  mmap_table_ = NULL;
-  DeallocateAllocationMap(alloc_address_map_);
-  alloc_address_map_ = NULL;
-  DeallocateAllocationMap(mmap_address_map_);
-  mmap_address_map_ = NULL;
+  // Free the allocation map.
+  address_map_->~AllocationMap();
+  dealloc_(address_map_);
+  address_map_ = NULL;
+
+  // Free the hash table.
+  for (int i = 0; i < kHashTableSize; i++) {
+    for (Bucket* curr = bucket_table_[i]; curr != 0; /**/) {
+      Bucket* bucket = curr;
+      curr = curr->next;
+      dealloc_(bucket->stack);
+      dealloc_(bucket);
+    }
+  }
+  dealloc_(bucket_table_);
+  bucket_table_ = NULL;
 }
 
-void HeapProfileTable::DeallocateAllocationMap(AllocationMap* allocation) {
-  if (allocation != NULL) {
-    alloc_address_map_->~AllocationMap();
-    dealloc_(allocation);
-  }
-}
-
-void HeapProfileTable::DeallocateBucketTable(Bucket** table) {
-  if (table != NULL) {
-    for (int b = 0; b < kHashTableSize; b++) {
-      for (Bucket* x = table[b]; x != 0; /**/) {
-        Bucket* b = x;
-        x = x->next;
-        dealloc_(b->stack);
-        dealloc_(b);
-      }
-    }
-    dealloc_(table);
-  }
-}
-
-HeapProfileTable::Bucket* HeapProfileTable::GetBucket(
-    int depth, const void* const key[], Bucket** table,
-    int* bucket_count) {
+HeapProfileTable::Bucket* HeapProfileTable::GetBucket(int depth,
+                                                      const void* const key[]) {
   // Make hash-value
   uintptr_t h = 0;
   for (int i = 0; i < depth; i++) {
     h += reinterpret_cast<uintptr_t>(key[i]);
     h += h << 10;
     h ^= h >> 6;
   }
   h += h << 3;
   h ^= h >> 11;
 
   // Lookup stack trace in table
   unsigned int buck = ((unsigned int) h) % kHashTableSize;
-  for (Bucket* b = table[buck]; b != 0; b = b->next) {
+  for (Bucket* b = bucket_table_[buck]; b != 0; b = b->next) {
     if ((b->hash == h) &&
         (b->depth == depth) &&
         equal(key, key + depth, b->stack)) {
       return b;
     }
   }
 
   // Create new bucket
   const size_t key_size = sizeof(key[0]) * depth;
   const void** kcopy = reinterpret_cast<const void**>(alloc_(key_size));
   copy(key, key + depth, kcopy);
   Bucket* b = reinterpret_cast<Bucket*>(alloc_(sizeof(Bucket)));
   memset(b, 0, sizeof(*b));
   b->hash  = h;
   b->depth = depth;
   b->stack = kcopy;
-  b->next  = table[buck];
-  table[buck] = b;
-  if (bucket_count != NULL) {
-    ++(*bucket_count);
-  }
+  b->next  = bucket_table_[buck];
+  bucket_table_[buck] = b;
+  num_buckets_++;
   return b;
 }
 
 int HeapProfileTable::GetCallerStackTrace(
     int skip_count, void* stack[kMaxStackDepth]) {
   return MallocHook::GetCallerStackTrace(
       stack, kMaxStackDepth, kStripFrames + skip_count + 1);
 }
 
 void HeapProfileTable::RecordAlloc(
     const void* ptr, size_t bytes, int stack_depth,
     const void* const call_stack[]) {
-  Bucket* b = GetBucket(stack_depth, call_stack, alloc_table_,
-                        &num_alloc_buckets_);
+  Bucket* b = GetBucket(stack_depth, call_stack);
   b->allocs++;
   b->alloc_size += bytes;
   total_.allocs++;
   total_.alloc_size += bytes;
 
   AllocValue v;
   v.set_bucket(b);  // also did set_live(false); set_ignore(false)
   v.bytes = bytes;
-  alloc_address_map_->Insert(ptr, v);
+  address_map_->Insert(ptr, v);
 }
 
 void HeapProfileTable::RecordFree(const void* ptr) {
   AllocValue v;
-  if (alloc_address_map_->FindAndRemove(ptr, &v)) {
+  if (address_map_->FindAndRemove(ptr, &v)) {
     Bucket* b = v.bucket();
     b->frees++;
     b->free_size += v.bytes;
     total_.frees++;
     total_.free_size += v.bytes;
   }
 }
 
 bool HeapProfileTable::FindAlloc(const void* ptr, size_t* object_size) const {
-  const AllocValue* alloc_value = alloc_address_map_->Find(ptr);
+  const AllocValue* alloc_value = address_map_->Find(ptr);
   if (alloc_value != NULL) *object_size = alloc_value->bytes;
   return alloc_value != NULL;
 }
 
 bool HeapProfileTable::FindAllocDetails(const void* ptr,
                                         AllocInfo* info) const {
-  const AllocValue* alloc_value = alloc_address_map_->Find(ptr);
+  const AllocValue* alloc_value = address_map_->Find(ptr);
   if (alloc_value != NULL) {
     info->object_size = alloc_value->bytes;
     info->call_stack = alloc_value->bucket()->stack;
     info->stack_depth = alloc_value->bucket()->depth;
   }
   return alloc_value != NULL;
 }
 
 bool HeapProfileTable::FindInsideAlloc(const void* ptr,
                                        size_t max_size,
                                        const void** object_ptr,
                                        size_t* object_size) const {
   const AllocValue* alloc_value =
-    alloc_address_map_->FindInside(&AllocValueSize, max_size, ptr, object_ptr);
+    address_map_->FindInside(&AllocValueSize, max_size, ptr, object_ptr);
   if (alloc_value != NULL) *object_size = alloc_value->bytes;
   return alloc_value != NULL;
 }
 
 bool HeapProfileTable::MarkAsLive(const void* ptr) {
-  AllocValue* alloc = alloc_address_map_->FindMutable(ptr);
+  AllocValue* alloc = address_map_->FindMutable(ptr);
   if (alloc && !alloc->live()) {
     alloc->set_live(true);
     return true;
   }
   return false;
 }
 
 void HeapProfileTable::MarkAsIgnored(const void* ptr) {
-  AllocValue* alloc = alloc_address_map_->FindMutable(ptr);
+  AllocValue* alloc = address_map_->FindMutable(ptr);
   if (alloc) {
     alloc->set_ignore(true);
   }
 }
 
 void HeapProfileTable::IterateAllocationAddresses(AddressIterator f,
                                                   void* data) {
   const AllocationAddressIteratorArgs args(f, data);
-  alloc_address_map_->Iterate<const AllocationAddressIteratorArgs&>(
+  address_map_->Iterate<const AllocationAddressIteratorArgs&>(
       AllocationAddressesIterator, args);
 }
 
 void HeapProfileTable::MarkCurrentAllocations(AllocationMark mark) {
   const MarkArgs args(mark, true);
-  alloc_address_map_->Iterate<const MarkArgs&>(MarkIterator, args);
+  address_map_->Iterate<const MarkArgs&>(MarkIterator, args);
 }
 
 void HeapProfileTable::MarkUnmarkedAllocations(AllocationMark mark) {
   const MarkArgs args(mark, true);
-  alloc_address_map_->Iterate<const MarkArgs&>(MarkIterator, args);
+  address_map_->Iterate<const MarkArgs&>(MarkIterator, args);
 }
 
 // We'd be happier using snprintfer, but we don't to reduce dependencies.
 int HeapProfileTable::UnparseBucket(const Bucket& b,
                                     char* buf, int buflen, int bufsize,
                                     const char* extra,
                                     Stats* profile_stats) {
   if (profile_stats != NULL) {
     profile_stats->allocs += b.allocs;
     profile_stats->alloc_size += b.alloc_size;
@@ skipping 17 matching lines @@
     buflen += printed;
   }
   printed = snprintf(buf + buflen, bufsize - buflen, "\n");
   if (printed < 0 || printed >= bufsize - buflen) return buflen;
   buflen += printed;
   return buflen;
 }
 
 HeapProfileTable::Bucket**
 HeapProfileTable::MakeSortedBucketList() const {
-  Bucket** list = reinterpret_cast<Bucket**>(alloc_(sizeof(Bucket) *
-      (num_alloc_buckets_ + num_available_mmap_buckets_)));
+  Bucket** list = static_cast<Bucket**>(alloc_(sizeof(Bucket) * num_buckets_));
 
-  RAW_DCHECK(mmap_table_ != NULL || num_available_mmap_buckets_ == 0, "");
-
-  int n = 0;
-
-  for (int b = 0; b < kHashTableSize; b++) {
-    for (Bucket* x = alloc_table_[b]; x != 0; x = x->next) {
-      list[n++] = x;
+  int bucket_count = 0;
+  for (int i = 0; i < kHashTableSize; i++) {
+    for (Bucket* curr = bucket_table_[i]; curr != 0; curr = curr->next) {
+      list[bucket_count++] = curr;
     }
   }
-  RAW_DCHECK(n == num_alloc_buckets_, "");
+  RAW_DCHECK(bucket_count == num_buckets_, "");
 
-  if (mmap_table_ != NULL) {
-    for (int b = 0; b < kHashTableSize; b++) {
-      for (Bucket* x = mmap_table_[b]; x != 0; x = x->next) {
-        list[n++] = x;
-      }
-    }
-  }
-  RAW_DCHECK(n == num_alloc_buckets_ + num_available_mmap_buckets_, "");
-
-  sort(list, list + num_alloc_buckets_ + num_available_mmap_buckets_,
-       ByAllocatedSpace);
+  sort(list, list + num_buckets_, ByAllocatedSpace);
 
   return list;
 }
 
-void HeapProfileTable::RefreshMMapData(Allocator mmap_alloc,
-                                       DeAllocator mmap_dealloc) {
-  // Make the table
-  static const int mmap_table_bytes = kHashTableSize * sizeof(*mmap_table_);
-  if (mmap_table_ == NULL) {
-    mmap_table_ = reinterpret_cast<Bucket**>(alloc_(mmap_table_bytes));
-    memset(mmap_table_, 0, mmap_table_bytes);
-  }
-  num_available_mmap_buckets_ = 0;
-
-  ClearMMapData();
-  mmap_address_map_ = new(alloc_(sizeof(AllocationMap)))
-      AllocationMap(mmap_alloc, mmap_dealloc);
-
-  MemoryRegionMap::LockHolder l;
-  for (MemoryRegionMap::RegionIterator r =
-           MemoryRegionMap::BeginRegionLocked();
-       r != MemoryRegionMap::EndRegionLocked(); ++r) {
-    Bucket* b =
-        GetBucket(r->call_stack_depth, r->call_stack, mmap_table_, NULL);
-    if (b->alloc_size == 0) {
-      num_available_mmap_buckets_ += 1;
-    }
-    b->allocs += 1;
-    b->alloc_size += r->end_addr - r->start_addr;
-
-    AllocValue v;
-    v.set_bucket(b);
-    v.bytes = r->end_addr - r->start_addr;
-    mmap_address_map_->Insert(reinterpret_cast<const void*>(r->start_addr), v);
-  }
-}
-
-void HeapProfileTable::ClearMMapData() {
-  if (mmap_address_map_ == NULL) return;
-
-  mmap_address_map_->Iterate(ZeroBucketCountsIterator, this);
-  mmap_address_map_->~AllocationMap();
-  dealloc_(mmap_address_map_);
-  mmap_address_map_ = NULL;
-}
-
 void HeapProfileTable::DumpMarkedObjects(AllocationMark mark,
                                          const char* file_name) {
   RawFD fd = RawOpenForWriting(file_name);
   if (fd == kIllegalRawFD) {
     RAW_LOG(ERROR, "Failed dumping live objects to %s", file_name);
     return;
   }
   const DumpMarkedArgs args(fd, mark);
-  alloc_address_map_->Iterate<const DumpMarkedArgs&>(DumpMarkedIterator, args);
+  address_map_->Iterate<const DumpMarkedArgs&>(DumpMarkedIterator, args);
   RawClose(fd);
 }
 
 #if defined(TYPE_PROFILING)
 void HeapProfileTable::DumpTypeStatistics(const char* file_name) const {
   RawFD fd = RawOpenForWriting(file_name);
   if (fd == kIllegalRawFD) {
     RAW_LOG(ERROR, "Failed dumping type statistics to %s", file_name);
     return;
   }
 
   AddressMap<TypeCount>* type_size_map;
   type_size_map = new(alloc_(sizeof(AddressMap<TypeCount>)))
       AddressMap<TypeCount>(alloc_, dealloc_);
-  alloc_address_map_->Iterate(TallyTypesItererator, type_size_map);
+  address_map_->Iterate(TallyTypesItererator, type_size_map);
 
   RawWrite(fd, kTypeProfileStatsHeader, strlen(kTypeProfileStatsHeader));
   const DumpArgs args(fd, NULL);
   type_size_map->Iterate<const DumpArgs&>(DumpTypesIterator, args);
   RawClose(fd);
 
   type_size_map->~AddressMap<TypeCount>();
   dealloc_(type_size_map);
 }
 #endif  // defined(TYPE_PROFILING)
 
 void HeapProfileTable::IterateOrderedAllocContexts(
     AllocContextIterator callback) const {
   Bucket** list = MakeSortedBucketList();
   AllocContextInfo info;
-  for (int i = 0; i < num_alloc_buckets_; ++i) {
+  for (int i = 0; i < num_buckets_; ++i) {
     *static_cast<Stats*>(&info) = *static_cast<Stats*>(list[i]);
     info.stack_depth = list[i]->depth;
     info.call_stack = list[i]->stack;
     callback(info);
   }
   dealloc_(list);
 }
 
 int HeapProfileTable::FillOrderedProfile(char buf[], int size) const {
   Bucket** list = MakeSortedBucketList();
@@ skipping 11 matching lines @@
   map_length += FillProcSelfMaps(buf + map_length, size - map_length, &dummy);
   RAW_DCHECK(map_length <= size, "");
   char* const map_start = buf + size - map_length;      // move to end
   memmove(map_start, buf, map_length);
   size -= map_length;
 
   Stats stats;
   memset(&stats, 0, sizeof(stats));
   int bucket_length = snprintf(buf, size, "%s", kProfileHeader);
   if (bucket_length < 0 || bucket_length >= size) return 0;
-  Bucket total_with_mmap(total_);
-  if (mmap_table_ != NULL) {
-    total_with_mmap.alloc_size += MemoryRegionMap::MapSize();
-    total_with_mmap.free_size += MemoryRegionMap::UnmapSize();
+  bucket_length = UnparseBucket(total_, buf, bucket_length, size,
+                                " heapprofile", &stats);
+
+  // Dump the mmap list first.
+  if (profile_mmap_) {
+    BufferArgs buffer(buf, bucket_length, size);
+    MemoryRegionMap::IterateBuckets<BufferArgs*>(DumpBucketIterator, &buffer);
+    bucket_length = buffer.buflen;
   }
-  bucket_length = UnparseBucket(total_with_mmap, buf, bucket_length, size,
-                                " heapprofile", &stats);
-  for (int i = 0; i < num_alloc_buckets_; i++) {
+
+  for (int i = 0; i < num_buckets_; i++) {
     bucket_length = UnparseBucket(*list[i], buf, bucket_length, size, "",
                                   &stats);
   }
   RAW_DCHECK(bucket_length < size, "");
 
   dealloc_(list);
 
   RAW_DCHECK(buf + bucket_length <= map_start, "");
   memmove(buf + bucket_length, map_start, map_length);  // close the gap
 
   return bucket_length + map_length;
 }
 
+// static
+void HeapProfileTable::DumpBucketIterator(const Bucket* bucket,
+                                          BufferArgs* args) {
+  args->buflen = UnparseBucket(*bucket, args->buf, args->buflen, args->bufsize,
+                               "", NULL);
+}
+
 #if defined(TYPE_PROFILING)
 // static
 void HeapProfileTable::TallyTypesItererator(
     const void* ptr,
     AllocValue* value,
     AddressMap<TypeCount>* type_size_map) {
   const std::type_info* type = LookupType(ptr);
 
   const void* key = NULL;
   if (type)
@@ skipping 70 matching lines @@
 }
 
 inline
 void HeapProfileTable::MarkIterator(const void* ptr, AllocValue* v,
                                     const MarkArgs& args) {
   if (!args.mark_all && v->mark() != UNMARKED)
     return;
   v->set_mark(args.mark);
 }
 
-inline void HeapProfileTable::ZeroBucketCountsIterator(
-    const void* ptr, AllocValue* v, HeapProfileTable* heap_profile) {
-  Bucket* b = v->bucket();
-  if (b != NULL) {
-    b->allocs = 0;
-    b->alloc_size = 0;
-    b->free_size = 0;
-    b->frees = 0;
-  }
-}
-
 // Callback from NonLiveSnapshot; adds entry to arg->dest
 // if not the entry is not live and is not present in arg->base.
 void HeapProfileTable::AddIfNonLive(const void* ptr, AllocValue* v,
                                     AddNonLiveArgs* arg) {
   if (v->live()) {
     v->set_live(false);
   } else {
     if (arg->base != NULL && arg->base->map_.Find(ptr) != NULL) {
       // Present in arg->base, so do not save
     } else {
@@ skipping 46 matching lines @@
     }
   }
   globfree(&g);
 #else   /* HAVE_GLOB_H */
   RAW_LOG(WARNING, "Unable to remove old heap profiles (can't run glob())");
 #endif
 }
 
 HeapProfileTable::Snapshot* HeapProfileTable::TakeSnapshot() {
   Snapshot* s = new (alloc_(sizeof(Snapshot))) Snapshot(alloc_, dealloc_);
-  alloc_address_map_->Iterate(AddToSnapshot, s);
+  address_map_->Iterate(AddToSnapshot, s);
   return s;
 }
 
 void HeapProfileTable::ReleaseSnapshot(Snapshot* s) {
   s->~Snapshot();
   dealloc_(s);
 }
 
 // Callback from TakeSnapshot; adds a single entry to snapshot
 void HeapProfileTable::AddToSnapshot(const void* ptr, AllocValue* v,
                                      Snapshot* snapshot) {
   snapshot->Add(ptr, *v);
 }
 
 HeapProfileTable::Snapshot* HeapProfileTable::NonLiveSnapshot(
     Snapshot* base) {
   RAW_VLOG(2, "NonLiveSnapshot input: %d %d\n",
            int(total_.allocs - total_.frees),
            int(total_.alloc_size - total_.free_size));
 
   Snapshot* s = new (alloc_(sizeof(Snapshot))) Snapshot(alloc_, dealloc_);
   AddNonLiveArgs args;
   args.dest = s;
   args.base = base;
-  alloc_address_map_->Iterate<AddNonLiveArgs*>(AddIfNonLive, &args);
+  address_map_->Iterate<AddNonLiveArgs*>(AddIfNonLive, &args);
   RAW_VLOG(2, "NonLiveSnapshot output: %d %d\n",
            int(s->total_.allocs - s->total_.frees),
            int(s->total_.alloc_size - s->total_.free_size));
   return s;
 }
 
 // Information kept per unique bucket seen
 struct HeapProfileTable::Snapshot::Entry {
   int count;
   int bytes;
@@ skipping 99 matching lines @@
                                               char* unused) {
   // Perhaps also log the allocation stack trace (unsymbolized)
   // on this line in case somebody finds it useful.
   RAW_LOG(ERROR, "leaked %"PRIuS" byte object %p", v->bytes, ptr);
 }
 
 void HeapProfileTable::Snapshot::ReportIndividualObjects() {
   char unused;
   map_.Iterate(ReportObject, &unused);
 }