[NOT TO COMMIT!] Replace third_party/tcmalloc/chromium with tcmalloc r136 (the latest).

third_party/tcmalloc/chromium/src/heap-profiler.cc

 // Copyright (c) 2005, 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 89 matching lines @@
              "If non-zero, dump heap profiling information once every "
              "specified number of bytes deallocated by the program "
              "since the last dump.");
 // We could also add flags that report whenever inuse_bytes changes by
 // X or -X, but there hasn't been a need for that yet, so we haven't.
 DEFINE_int64(heap_profile_inuse_interval,
              EnvToInt64("HEAP_PROFILE_INUSE_INTERVAL", 100 << 20 /*100MB*/),
              "If non-zero, dump heap profiling information whenever "
              "the high-water memory usage mark increases by the specified "
              "number of bytes.");
-DEFINE_int64(heap_profile_time_interval,
-             EnvToInt64("HEAP_PROFILE_TIME_INTERVAL", 0),
-             "If non-zero, dump heap profiling information once every "
-             "specified number of seconds since the last dump.");
 DEFINE_bool(mmap_log,
             EnvToBool("HEAP_PROFILE_MMAP_LOG", false),
             "Should mmap/munmap calls be logged?");
 DEFINE_bool(mmap_profile,
             EnvToBool("HEAP_PROFILE_MMAP", false),
             "If heap-profiling is on, also profile mmap, mremap, and sbrk)");
 DEFINE_bool(only_mmap_profile,
             EnvToBool("HEAP_PROFILE_ONLY_MMAP", false),
             "If heap-profiling is on, only profile mmap, mremap, and sbrk; "
             "do not profile malloc/new/etc");
@@ skipping 18 matching lines @@
 static LowLevelAlloc::Arena *heap_profiler_memory;
 
 static void* ProfilerMalloc(size_t bytes) {
   return LowLevelAlloc::AllocWithArena(bytes, heap_profiler_memory);
 }
 static void ProfilerFree(void* p) {
   LowLevelAlloc::Free(p);
 }
 
 // We use buffers of this size in DoGetHeapProfile.
-// The size is 1 << 20 in the original google-perftools.  Changed it to
-// 5 << 20 since a larger buffer is requried for deeper profiling in Chromium.
-// The buffer is allocated only when the environment variable HEAPPROFILE is
-// specified to dump heap information.
-static const int kProfileBufferSize = 5 << 20;
+static const int kProfileBufferSize = 1 << 20;
 
 // This is a last-ditch buffer we use in DumpProfileLocked in case we
 // can't allocate more memory from ProfilerMalloc.  We expect this
 // will be used by HeapProfileEndWriter when the application has to
 // exit due to out-of-memory.  This buffer is allocated in
 // HeapProfilerStart.  Access to this must be protected by heap_lock.
 static char* global_profiler_buffer = NULL;
 
 
 //----------------------------------------------------------------------
 // Profiling control/state data
 //----------------------------------------------------------------------
 
 // Access to all of these is protected by heap_lock.
 static bool  is_on = false;           // If are on as a subsytem.
 static bool  dumping = false;         // Dumping status to prevent recursion
 static char* filename_prefix = NULL;  // Prefix used for profile file names
                                       // (NULL if no need for dumping yet)
 static int   dump_count = 0;          // How many dumps so far
 static int64 last_dump_alloc = 0;     // alloc_size when did we last dump
 static int64 last_dump_free = 0;      // free_size when did we last dump
 static int64 high_water_mark = 0;     // In-use-bytes at last high-water dump
-static int64 last_dump_time = 0;      // The time of the last dump
 
 static HeapProfileTable* heap_profile = NULL;  // the heap profile table
 
 //----------------------------------------------------------------------
 // Profile generation
 //----------------------------------------------------------------------
 
-enum AddOrRemove { ADD, REMOVE };
-
-// Add or remove all MMap-allocated regions to/from *heap_profile.
-// Assumes heap_lock is held.
-static void AddRemoveMMapDataLocked(AddOrRemove mode) {
-  RAW_DCHECK(heap_lock.IsHeld(), "");
-  if (!FLAGS_mmap_profile || !is_on) return;
-  // MemoryRegionMap maintained all the data we need for all
-  // mmap-like allocations, so we just use it here:
-  MemoryRegionMap::LockHolder l;
-  for (MemoryRegionMap::RegionIterator r = MemoryRegionMap::BeginRegionLocked();
-       r != MemoryRegionMap::EndRegionLocked(); ++r) {
-    if (mode == ADD) {
-      heap_profile->RecordAllocWithStack(
-        reinterpret_cast<const void*>(r->start_addr),
-        r->end_addr - r->start_addr,
-        r->call_stack_depth, r->call_stack);
-    } else {
-      heap_profile->RecordFree(reinterpret_cast<void*>(r->start_addr));
-    }
-  }
-}
-
 // Input must be a buffer of size at least 1MB.
 static char* DoGetHeapProfileLocked(char* buf, int buflen) {
   // We used to be smarter about estimating the required memory and
   // then capping it to 1MB and generating the profile into that.
   if (buf == NULL || buflen < 1)
     return NULL;
 
   RAW_DCHECK(heap_lock.IsHeld(), "");
   int bytes_written = 0;
   if (is_on) {
-    HeapProfileTable::Stats const stats = heap_profile->total();
-    (void)stats;   // avoid an unused-variable warning in non-debug mode.
-    AddRemoveMMapDataLocked(ADD);
+    if (FLAGS_mmap_profile) {
+      heap_profile->RefreshMMapData();
+    }
     bytes_written = heap_profile->FillOrderedProfile(buf, buflen - 1);
-    // FillOrderedProfile should not reduce the set of active mmap-ed regions,
-    // hence MemoryRegionMap will let us remove everything we've added above:
-    AddRemoveMMapDataLocked(REMOVE);
-    RAW_DCHECK(stats.Equivalent(heap_profile->total()), "");
-    // if this fails, we somehow removed by AddRemoveMMapDataLocked
-    // more than we have added.
+    if (FLAGS_mmap_profile) {
+      heap_profile->ClearMMapData();
+    }
   }
   buf[bytes_written] = '\0';
   RAW_DCHECK(bytes_written == strlen(buf), "");
 
   return buf;
 }
 
 extern "C" char* GetHeapProfile() {
   // Use normal malloc: we return the profile to the user to free it:
   char* buffer = reinterpret_cast<char*>(malloc(kProfileBufferSize));
@@ skipping 11 matching lines @@
   RAW_DCHECK(is_on, "");
   RAW_DCHECK(!dumping, "");
 
   if (filename_prefix == NULL) return;  // we do not yet need dumping
 
   dumping = true;
 
   // Make file name
   char file_name[1000];
   dump_count++;
-  snprintf(file_name, sizeof(file_name), "%s.%05d.%04d%s",
-           filename_prefix, getpid(), dump_count, HeapProfileTable::kFileExt);
+  snprintf(file_name, sizeof(file_name), "%s.%04d%s",
+           filename_prefix, dump_count, HeapProfileTable::kFileExt);
 
   // Dump the profile
   RAW_VLOG(0, "Dumping heap profile to %s (%s)", file_name, reason);
   // We must use file routines that don't access memory, since we hold
   // a memory lock now.
   RawFD fd = RawOpenForWriting(file_name);
   if (fd == kIllegalRawFD) {
     RAW_LOG(ERROR, "Failed dumping heap profile to %s", file_name);
     dumping = false;
     return;
@@ skipping 19 matching lines @@
 //----------------------------------------------------------------------
 
 // Dump a profile after either an allocation or deallocation, if
 // the memory use has changed enough since the last dump.
 static void MaybeDumpProfileLocked() {
   if (!dumping) {
     const HeapProfileTable::Stats& total = heap_profile->total();
     const int64 inuse_bytes = total.alloc_size - total.free_size;
     bool need_to_dump = false;
     char buf[128];
-    int64 current_time = time(NULL);
     if (FLAGS_heap_profile_allocation_interval > 0 &&
         total.alloc_size >=
         last_dump_alloc + FLAGS_heap_profile_allocation_interval) {
       snprintf(buf, sizeof(buf), ("%"PRId64" MB allocated cumulatively, "
                                   "%"PRId64" MB currently in use"),
                total.alloc_size >> 20, inuse_bytes >> 20);
       need_to_dump = true;
     } else if (FLAGS_heap_profile_deallocation_interval > 0 &&
                total.free_size >=
                last_dump_free + FLAGS_heap_profile_deallocation_interval) {
       snprintf(buf, sizeof(buf), ("%"PRId64" MB freed cumulatively, "
                                   "%"PRId64" MB currently in use"),
                total.free_size >> 20, inuse_bytes >> 20);
       need_to_dump = true;
     } else if (FLAGS_heap_profile_inuse_interval > 0 &&
                inuse_bytes >
                high_water_mark + FLAGS_heap_profile_inuse_interval) {
       snprintf(buf, sizeof(buf), "%"PRId64" MB currently in use",
                inuse_bytes >> 20);
       need_to_dump = true;
-    } else if (FLAGS_heap_profile_time_interval > 0 &&
-               current_time - last_dump_time >=
-               FLAGS_heap_profile_time_interval) {
-      snprintf(buf, sizeof(buf), "%d sec since the last dump",
-               current_time - last_dump_time);
-      need_to_dump = true;
-      last_dump_time = current_time;
     }
     if (need_to_dump) {
       DumpProfileLocked(buf);
 
       last_dump_alloc = total.alloc_size;
       last_dump_free = total.free_size;
       if (inuse_bytes > high_water_mark)
         high_water_mark = inuse_bytes;
     }
   }
 }
 
 // Record an allocation in the profile.
 static void RecordAlloc(const void* ptr, size_t bytes, int skip_count) {
+  // Take the stack trace outside the critical section.
+  void* stack[HeapProfileTable::kMaxStackDepth];
+  int depth = HeapProfileTable::GetCallerStackTrace(skip_count + 1, stack);
   SpinLockHolder l(&heap_lock);
   if (is_on) {
-    heap_profile->RecordAlloc(ptr, bytes, skip_count + 1);
+    heap_profile->RecordAlloc(ptr, bytes, depth, stack);
     MaybeDumpProfileLocked();
   }
 }
 
 // Record a deallocation in the profile.
 static void RecordFree(const void* ptr) {
   SpinLockHolder l(&heap_lock);
   if (is_on) {
     heap_profile->RecordFree(ptr);
     MaybeDumpProfileLocked();
@@ skipping 64 matching lines @@
     // in pretty-printing of NULL as "nil".
     // TODO(maxim): instead should use a safe snprintf reimplementation
     RAW_LOG(INFO, "munmap(start=0x%"PRIxPTR", len=%"PRIuS")",
                   (uintptr_t) ptr, size);
 #ifdef TODO_REENABLE_STACK_TRACING
     DumpStackTrace(1, RawInfoStackDumper, NULL);
 #endif
   }
 }
 
-static void SbrkHook(const void* result, std::ptrdiff_t increment) {
+static void SbrkHook(const void* result, ptrdiff_t increment) {
   if (FLAGS_mmap_log) {  // log it
     RAW_LOG(INFO, "sbrk(inc=%"PRIdS") = 0x%"PRIxPTR"",
                   increment, (uintptr_t) result);
 #ifdef TODO_REENABLE_STACK_TRACING
     DumpStackTrace(1, RawInfoStackDumper, NULL);
 #endif
   }
 }
 
 //----------------------------------------------------------------------
@@ skipping 38 matching lines @@
   // heap profile even if the application runs out of memory.
   global_profiler_buffer =
       reinterpret_cast<char*>(ProfilerMalloc(kProfileBufferSize));
 
   heap_profile = new(ProfilerMalloc(sizeof(HeapProfileTable)))
                    HeapProfileTable(ProfilerMalloc, ProfilerFree);
 
   last_dump_alloc = 0;
   last_dump_free = 0;
   high_water_mark = 0;
-  last_dump_time = 0;
 
   // We do not reset dump_count so if the user does a sequence of
   // HeapProfilerStart/HeapProfileStop, we will get a continuous
   // sequence of profiles.
 
   if (FLAGS_only_mmap_profile == false) {
     // Now set the hooks that capture new/delete and malloc/free.
     RAW_CHECK(MallocHook::AddNewHook(&NewHook), "");
     RAW_CHECK(MallocHook::AddDeleteHook(&DeleteHook), "");
   }
@@ skipping 86 matching lines @@
 
 // class used for finalization -- dumps the heap-profile at program exit
 struct HeapProfileEndWriter {
   ~HeapProfileEndWriter() { HeapProfilerDump("Exiting"); }
 };
 
 // We want to make sure tcmalloc is up and running before starting the profiler
 static const TCMallocGuard tcmalloc_initializer;
 REGISTER_MODULE_INITIALIZER(heapprofiler, HeapProfilerInit());
 static HeapProfileEndWriter heap_profile_end_writer;