third_party/tcmalloc/chromium/src/malloc_extension.cc

   1 // Copyright (c) 2012, Google Inc.
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  10 //     * Redistributions in binary form must reproduce the above
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  29
  30 // ---
  31 // Author: Sanjay Ghemawat <opensource@google.com>
  32
  33 #include <config.h>
  34 #include <assert.h>
  35 #include <string.h>
  36 #include <stdio.h>
  37 #if defined HAVE_STDINT_H
  38 #include <stdint.h>
  39 #elif defined HAVE_INTTYPES_H
  40 #include <inttypes.h>
  41 #else
  42 #include <sys/types.h>
  43 #endif
  44 #include <string>
  45 #include "base/dynamic_annotations.h"
  46 #include "base/sysinfo.h"    // for FillProcSelfMaps
  47 #ifndef NO_HEAP_CHECK
  48 #include "gperftools/heap-checker.h"
  49 #endif
  50 #include "gperftools/malloc_extension.h"
  51 #include "gperftools/malloc_extension_c.h"
  52 #include "maybe_threads.h"
  53 #include "thread_cache.h"
  54
  55 using STL_NAMESPACE::string;
  56 using STL_NAMESPACE::vector;
  57
  58 static void DumpAddressMap(string* result) {
  59   *result += "\nMAPPED_LIBRARIES:\n";
  60   // We keep doubling until we get a fit
  61   const size_t old_resultlen = result->size();
  62   for (int amap_size = 10240; amap_size < 10000000; amap_size *= 2) {
  63     result->resize(old_resultlen + amap_size);
  64     bool wrote_all = false;
  65     const int bytes_written =
  66         tcmalloc::FillProcSelfMaps(&((*result)[old_resultlen]), amap_size,
  67                                    &wrote_all);
  68     if (wrote_all) {   // we fit!
  69       (*result)[old_resultlen + bytes_written] = '\0';
  70       result->resize(old_resultlen + bytes_written);
  71       return;
  72     }
  73   }
  74   result->reserve(old_resultlen);   // just don't print anything
  75 }
  76
  77 // Note: this routine is meant to be called before threads are spawned.
  78 void MallocExtension::Initialize() {
  79   static bool initialize_called = false;
  80
  81   if (initialize_called) return;
  82   initialize_called = true;
  83
  84 #ifdef __GLIBC__
  85   // GNU libc++ versions 3.3 and 3.4 obey the environment variables
  86   // GLIBCPP_FORCE_NEW and GLIBCXX_FORCE_NEW respectively.  Setting
  87   // one of these variables forces the STL default allocator to call
  88   // new() or delete() for each allocation or deletion.  Otherwise
  89   // the STL allocator tries to avoid the high cost of doing
  90   // allocations by pooling memory internally.  However, tcmalloc
  91   // does allocations really fast, especially for the types of small
  92   // items one sees in STL, so it's better off just using us.
  93   // TODO: control whether we do this via an environment variable?
  94   setenv("GLIBCPP_FORCE_NEW", "1", false /* no overwrite*/);
  95   setenv("GLIBCXX_FORCE_NEW", "1", false /* no overwrite*/);
  96
  97   // Now we need to make the setenv 'stick', which it may not do since
  98   // the env is flakey before main() is called.  But luckily stl only
  99   // looks at this env var the first time it tries to do an alloc, and
 100   // caches what it finds.  So we just cause an stl alloc here.
 101   string dummy("I need to be allocated");
 102   dummy += "!";         // so the definition of dummy isn't optimized out
 103 #endif  /* __GLIBC__ */
 104 }
 105
 106 // SysAllocator implementation
 107 SysAllocator::~SysAllocator() {}
 108
 109 // Default implementation -- does nothing
 110 MallocExtension::~MallocExtension() { }
 111 bool MallocExtension::VerifyAllMemory() { return true; }
 112 bool MallocExtension::VerifyNewMemory(const void* p) { return true; }
 113 bool MallocExtension::VerifyArrayNewMemory(const void* p) { return true; }
 114 bool MallocExtension::VerifyMallocMemory(const void* p) { return true; }
 115
 116 bool MallocExtension::GetNumericProperty(const char* property, size_t* value) {
 117   return false;
 118 }
 119
 120 bool MallocExtension::SetNumericProperty(const char* property, size_t value) {
 121   return false;
 122 }
 123
 124 void MallocExtension::GetStats(char* buffer, int length) {
 125   assert(length > 0);
 126   buffer[0] = '\0';
 127 }
 128
 129 bool MallocExtension::MallocMemoryStats(int* blocks, size_t* total,
 130                                        int histogram[kMallocHistogramSize]) {
 131   *blocks = 0;
 132   *total = 0;
 133   memset(histogram, 0, sizeof(*histogram) * kMallocHistogramSize);
 134   return true;
 135 }
 136
 137 void** MallocExtension::ReadStackTraces(int* sample_period) {
 138   return NULL;
 139 }
 140
 141 void** MallocExtension::ReadHeapGrowthStackTraces() {
 142   return NULL;
 143 }
 144
 145 void MallocExtension::MarkThreadIdle() {
 146   // Default implementation does nothing
 147 }
 148
 149 void MallocExtension::MarkThreadBusy() {
 150   // Default implementation does nothing
 151 }
 152
 153 SysAllocator* MallocExtension::GetSystemAllocator() {
 154   return NULL;
 155 }
 156
 157 void MallocExtension::SetSystemAllocator(SysAllocator *a) {
 158   // Default implementation does nothing
 159 }
 160
 161 void MallocExtension::ReleaseToSystem(size_t num_bytes) {
 162   // Default implementation does nothing
 163 }
 164
 165 void MallocExtension::ReleaseFreeMemory() {
 166   ReleaseToSystem(static_cast<size_t>(-1));   // SIZE_T_MAX
 167 }
 168
 169 void MallocExtension::SetMemoryReleaseRate(double rate) {
 170   // Default implementation does nothing
 171 }
 172
 173 double MallocExtension::GetMemoryReleaseRate() {
 174   return -1.0;
 175 }
 176
 177 size_t MallocExtension::GetEstimatedAllocatedSize(size_t size) {
 178   return size;
 179 }
 180
 181 size_t MallocExtension::GetAllocatedSize(const void* p) {
 182   assert(GetOwnership(p) != kNotOwned);
 183   return 0;
 184 }
 185
 186 MallocExtension::Ownership MallocExtension::GetOwnership(const void* p) {
 187   return kUnknownOwnership;
 188 }
 189
 190 void MallocExtension::GetFreeListSizes(
 191     vector<MallocExtension::FreeListInfo>* v) {
 192   v->clear();
 193 }
 194
 195 // The current malloc extension object.
 196
 197 static pthread_once_t module_init = PTHREAD_ONCE_INIT;
 198 static MallocExtension* current_instance = NULL;
 199
 200 static void InitModule() {
 201   current_instance = new MallocExtension;
 202 #ifndef NO_HEAP_CHECK
 203   HeapLeakChecker::IgnoreObject(current_instance);
 204 #endif
 205 }
 206
 207 MallocExtension* MallocExtension::instance() {
 208   perftools_pthread_once(&module_init, InitModule);
 209   return current_instance;
 210 }
 211
 212 void MallocExtension::Register(MallocExtension* implementation) {
 213   perftools_pthread_once(&module_init, InitModule);
 214   // When running under valgrind, our custom malloc is replaced with
 215   // valgrind's one and malloc extensions will not work.  (Note:
 216   // callers should be responsible for checking that they are the
 217   // malloc that is really being run, before calling Register.  This
 218   // is just here as an extra sanity check.)
 219   if (!RunningOnValgrind()) {
 220     current_instance = implementation;
 221   }
 222 }
 223
 224 unsigned int MallocExtension::GetBytesAllocatedOnCurrentThread() {
 225   return tcmalloc::ThreadCache::GetBytesAllocatedOnCurrentThread();
 226 }
 227
 228 // -----------------------------------------------------------------------
 229 // Heap sampling support
 230 // -----------------------------------------------------------------------
 231
 232 namespace {
 233
 234 // Accessors
 235 uintptr_t Count(void** entry) {
 236   return reinterpret_cast<uintptr_t>(entry[0]);
 237 }
 238 uintptr_t Size(void** entry) {
 239   return reinterpret_cast<uintptr_t>(entry[1]);
 240 }
 241 uintptr_t Depth(void** entry) {
 242   return reinterpret_cast<uintptr_t>(entry[2]);
 243 }
 244 void* PC(void** entry, int i) {
 245   return entry[3+i];
 246 }
 247
 248 void PrintCountAndSize(MallocExtensionWriter* writer,
 249                        uintptr_t count, uintptr_t size) {
 250   char buf[100];
 251   snprintf(buf, sizeof(buf),
 252            "%6"PRIu64": %8"PRIu64" [%6"PRIu64": %8"PRIu64"] @",
 253            static_cast<uint64>(count),
 254            static_cast<uint64>(size),
 255            static_cast<uint64>(count),
 256            static_cast<uint64>(size));
 257   writer->append(buf, strlen(buf));
 258 }
 259
 260 void PrintHeader(MallocExtensionWriter* writer,
 261                  const char* label, void** entries) {
 262   // Compute the total count and total size
 263   uintptr_t total_count = 0;
 264   uintptr_t total_size = 0;
 265   for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
 266     total_count += Count(entry);
 267     total_size += Size(entry);
 268   }
 269
 270   const char* const kTitle = "heap profile: ";
 271   writer->append(kTitle, strlen(kTitle));
 272   PrintCountAndSize(writer, total_count, total_size);
 273   writer->append(" ", 1);
 274   writer->append(label, strlen(label));
 275   writer->append("\n", 1);
 276 }
 277
 278 void PrintStackEntry(MallocExtensionWriter* writer, void** entry) {
 279   PrintCountAndSize(writer, Count(entry), Size(entry));
 280
 281   for (int i = 0; i < Depth(entry); i++) {
 282     char buf[32];
 283     snprintf(buf, sizeof(buf), " %p", PC(entry, i));
 284     writer->append(buf, strlen(buf));
 285   }
 286   writer->append("\n", 1);
 287 }
 288
 289 }
 290
 291 void MallocExtension::GetHeapSample(MallocExtensionWriter* writer) {
 292   int sample_period = 0;
 293   void** entries = ReadStackTraces(&sample_period);
 294   if (entries == NULL) {
 295     const char* const kErrorMsg =
 296         "This malloc implementation does not support sampling.\n"
 297         "As of 2005/01/26, only tcmalloc supports sampling, and\n"
 298         "you are probably running a binary that does not use\n"
 299         "tcmalloc.\n";
 300     writer->append(kErrorMsg, strlen(kErrorMsg));
 301     return;
 302   }
 303
 304   char label[32];
 305   sprintf(label, "heap_v2/%d", sample_period);
 306   PrintHeader(writer, label, entries);
 307   for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
 308     PrintStackEntry(writer, entry);
 309   }
 310   delete[] entries;
 311
 312   DumpAddressMap(writer);
 313 }
 314
 315 void MallocExtension::GetHeapGrowthStacks(MallocExtensionWriter* writer) {
 316   void** entries = ReadHeapGrowthStackTraces();
 317   if (entries == NULL) {
 318     const char* const kErrorMsg =
 319         "This malloc implementation does not support "
 320         "ReadHeapGrowthStackTraces().\n"
 321         "As of 2005/09/27, only tcmalloc supports this, and you\n"
 322         "are probably running a binary that does not use tcmalloc.\n";
 323     writer->append(kErrorMsg, strlen(kErrorMsg));
 324     return;
 325   }
 326
 327   // Do not canonicalize the stack entries, so that we get a
 328   // time-ordered list of stack traces, which may be useful if the
 329   // client wants to focus on the latest stack traces.
 330   PrintHeader(writer, "growth", entries);
 331   for (void** entry = entries; Count(entry) != 0; entry += 3 + Depth(entry)) {
 332     PrintStackEntry(writer, entry);
 333   }
 334   delete[] entries;
 335
 336   DumpAddressMap(writer);
 337 }
 338
 339 void MallocExtension::Ranges(void* arg, RangeFunction func) {
 340   // No callbacks by default
 341 }
 342
 343 // These are C shims that work on the current instance.
 344
 345 #define C_SHIM(fn, retval, paramlist, arglist)          \
 346   extern "C" PERFTOOLS_DLL_DECL retval MallocExtension_##fn paramlist {    \
 347     return MallocExtension::instance()->fn arglist;     \
 348   }
 349
 350 C_SHIM(VerifyAllMemory, int, (void), ());
 351 C_SHIM(VerifyNewMemory, int, (const void* p), (p));
 352 C_SHIM(VerifyArrayNewMemory, int, (const void* p), (p));
 353 C_SHIM(VerifyMallocMemory, int, (const void* p), (p));
 354 C_SHIM(MallocMemoryStats, int,
 355        (int* blocks, size_t* total, int histogram[kMallocHistogramSize]),
 356        (blocks, total, histogram));
 357
 358 C_SHIM(GetStats, void,
 359        (char* buffer, int buffer_length), (buffer, buffer_length));
 360 C_SHIM(GetNumericProperty, int,
 361        (const char* property, size_t* value), (property, value));
 362 C_SHIM(SetNumericProperty, int,
 363        (const char* property, size_t value), (property, value));
 364
 365 C_SHIM(MarkThreadIdle, void, (void), ());
 366 C_SHIM(MarkThreadBusy, void, (void), ());
 367 C_SHIM(ReleaseFreeMemory, void, (void), ());
 368 C_SHIM(ReleaseToSystem, void, (size_t num_bytes), (num_bytes));
 369 C_SHIM(GetEstimatedAllocatedSize, size_t, (size_t size), (size));
 370 C_SHIM(GetAllocatedSize, size_t, (const void* p), (p));
 371
 372 // Can't use the shim here because of the need to translate the enums.
 373 extern "C"
 374 MallocExtension_Ownership MallocExtension_GetOwnership(const void* p) {
 375   return static_cast<MallocExtension_Ownership>(
 376       MallocExtension::instance()->GetOwnership(p));
 377 }