Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | |
| 20 | #include <fstream> |
| 21 | #include <iostream> |
| 22 | #include <string> |
| 23 | #include <vector> |
| 24 | #include <set> |
| 25 | #include <map> |
| 26 | |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 27 | #include "art_method-inl.h" |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 28 | #include "base/unix_file/fd_file.h" |
| 29 | #include "base/stringprintf.h" |
| 30 | #include "gc/space/image_space.h" |
| 31 | #include "gc/heap.h" |
| 32 | #include "mirror/class-inl.h" |
| 33 | #include "mirror/object-inl.h" |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 34 | #include "image.h" |
| 35 | #include "scoped_thread_state_change.h" |
| 36 | #include "os.h" |
| 37 | #include "gc_map.h" |
| 38 | |
| 39 | #include "cmdline.h" |
| 40 | #include "backtrace/BacktraceMap.h" |
| 41 | |
| 42 | #include <sys/stat.h> |
| 43 | #include <sys/types.h> |
| 44 | #include <signal.h> |
| 45 | |
| 46 | namespace art { |
| 47 | |
| 48 | class ImgDiagDumper { |
| 49 | public: |
| 50 | explicit ImgDiagDumper(std::ostream* os, |
| 51 | const ImageHeader& image_header, |
| 52 | const char* image_location, |
| 53 | pid_t image_diff_pid) |
| 54 | : os_(os), |
| 55 | image_header_(image_header), |
| 56 | image_location_(image_location), |
| 57 | image_diff_pid_(image_diff_pid) {} |
| 58 | |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 59 | bool Dump() SHARED_REQUIRES(Locks::mutator_lock_) { |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 60 | std::ostream& os = *os_; |
| 61 | os << "MAGIC: " << image_header_.GetMagic() << "\n\n"; |
| 62 | |
| 63 | os << "IMAGE BEGIN: " << reinterpret_cast<void*>(image_header_.GetImageBegin()) << "\n\n"; |
| 64 | |
| 65 | bool ret = true; |
| 66 | if (image_diff_pid_ >= 0) { |
| 67 | os << "IMAGE DIFF PID (" << image_diff_pid_ << "): "; |
| 68 | ret = DumpImageDiff(image_diff_pid_); |
| 69 | os << "\n\n"; |
| 70 | } else { |
| 71 | os << "IMAGE DIFF PID: disabled\n\n"; |
| 72 | } |
| 73 | |
| 74 | os << std::flush; |
| 75 | |
| 76 | return ret; |
| 77 | } |
| 78 | |
| 79 | private: |
| 80 | static bool EndsWith(const std::string& str, const std::string& suffix) { |
| 81 | return str.size() >= suffix.size() && |
| 82 | str.compare(str.size() - suffix.size(), suffix.size(), suffix) == 0; |
| 83 | } |
| 84 | |
| 85 | // Return suffix of the file path after the last /. (e.g. /foo/bar -> bar, bar -> bar) |
| 86 | static std::string BaseName(const std::string& str) { |
| 87 | size_t idx = str.rfind("/"); |
| 88 | if (idx == std::string::npos) { |
| 89 | return str; |
| 90 | } |
| 91 | |
| 92 | return str.substr(idx + 1); |
| 93 | } |
| 94 | |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 95 | bool DumpImageDiff(pid_t image_diff_pid) SHARED_REQUIRES(Locks::mutator_lock_) { |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 96 | std::ostream& os = *os_; |
| 97 | |
| 98 | { |
| 99 | struct stat sts; |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 100 | std::string proc_pid_str = |
| 101 | StringPrintf("/proc/%ld", static_cast<long>(image_diff_pid)); // NOLINT [runtime/int] |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 102 | if (stat(proc_pid_str.c_str(), &sts) == -1) { |
| 103 | os << "Process does not exist"; |
| 104 | return false; |
| 105 | } |
| 106 | } |
| 107 | |
| 108 | // Open /proc/$pid/maps to view memory maps |
| 109 | auto proc_maps = std::unique_ptr<BacktraceMap>(BacktraceMap::Create(image_diff_pid)); |
| 110 | if (proc_maps == nullptr) { |
| 111 | os << "Could not read backtrace maps"; |
| 112 | return false; |
| 113 | } |
| 114 | |
| 115 | bool found_boot_map = false; |
| 116 | backtrace_map_t boot_map = backtrace_map_t(); |
| 117 | // Find the memory map only for boot.art |
| 118 | for (const backtrace_map_t& map : *proc_maps) { |
| 119 | if (EndsWith(map.name, GetImageLocationBaseName())) { |
| 120 | if ((map.flags & PROT_WRITE) != 0) { |
| 121 | boot_map = map; |
| 122 | found_boot_map = true; |
| 123 | break; |
| 124 | } |
| 125 | // In actuality there's more than 1 map, but the second one is read-only. |
| 126 | // The one we care about is the write-able map. |
| 127 | // The readonly maps are guaranteed to be identical, so its not interesting to compare |
| 128 | // them. |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | if (!found_boot_map) { |
| 133 | os << "Could not find map for " << GetImageLocationBaseName(); |
| 134 | return false; |
| 135 | } |
| 136 | |
| 137 | // Future idea: diff against zygote so we can ignore the shared dirty pages. |
| 138 | return DumpImageDiffMap(image_diff_pid, boot_map); |
| 139 | } |
| 140 | |
| 141 | // Look at /proc/$pid/mem and only diff the things from there |
| 142 | bool DumpImageDiffMap(pid_t image_diff_pid, const backtrace_map_t& boot_map) |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 143 | SHARED_REQUIRES(Locks::mutator_lock_) { |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 144 | std::ostream& os = *os_; |
| 145 | const size_t pointer_size = InstructionSetPointerSize( |
| 146 | Runtime::Current()->GetInstructionSet()); |
| 147 | |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 148 | std::string file_name = |
| 149 | StringPrintf("/proc/%ld/mem", static_cast<long>(image_diff_pid)); // NOLINT [runtime/int] |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 150 | |
| 151 | size_t boot_map_size = boot_map.end - boot_map.start; |
| 152 | |
| 153 | // Open /proc/$pid/mem as a file |
| 154 | auto map_file = std::unique_ptr<File>(OS::OpenFileForReading(file_name.c_str())); |
| 155 | if (map_file == nullptr) { |
| 156 | os << "Failed to open " << file_name << " for reading"; |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | // Memory-map /proc/$pid/mem subset from the boot map |
| 161 | CHECK(boot_map.end >= boot_map.start); |
| 162 | |
| 163 | std::string error_msg; |
| 164 | |
| 165 | // Walk the bytes and diff against our boot image |
| 166 | const ImageHeader& boot_image_header = GetBootImageHeader(); |
| 167 | |
| 168 | os << "\nObserving boot image header at address " |
| 169 | << reinterpret_cast<const void*>(&boot_image_header) |
| 170 | << "\n\n"; |
| 171 | |
| 172 | const uint8_t* image_begin_unaligned = boot_image_header.GetImageBegin(); |
Mathieu Chartier | c785344 | 2015-03-27 14:35:38 -0700 | [diff] [blame] | 173 | const uint8_t* image_mirror_end_unaligned = image_begin_unaligned + |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 174 | boot_image_header.GetImageSection(ImageHeader::kSectionObjects).Size(); |
| 175 | const uint8_t* image_end_unaligned = image_begin_unaligned + boot_image_header.GetImageSize(); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 176 | |
| 177 | // Adjust range to nearest page |
| 178 | const uint8_t* image_begin = AlignDown(image_begin_unaligned, kPageSize); |
| 179 | const uint8_t* image_end = AlignUp(image_end_unaligned, kPageSize); |
| 180 | |
| 181 | ptrdiff_t page_off_begin = boot_image_header.GetImageBegin() - image_begin; |
| 182 | |
| 183 | if (reinterpret_cast<uintptr_t>(image_begin) > boot_map.start || |
| 184 | reinterpret_cast<uintptr_t>(image_end) < boot_map.end) { |
| 185 | // Sanity check that we aren't trying to read a completely different boot image |
| 186 | os << "Remote boot map is out of range of local boot map: " << |
| 187 | "local begin " << reinterpret_cast<const void*>(image_begin) << |
| 188 | ", local end " << reinterpret_cast<const void*>(image_end) << |
| 189 | ", remote begin " << reinterpret_cast<const void*>(boot_map.start) << |
| 190 | ", remote end " << reinterpret_cast<const void*>(boot_map.end); |
| 191 | return false; |
| 192 | // If we wanted even more validation we could map the ImageHeader from the file |
| 193 | } |
| 194 | |
| 195 | std::vector<uint8_t> remote_contents(boot_map_size); |
| 196 | if (!map_file->PreadFully(&remote_contents[0], boot_map_size, boot_map.start)) { |
| 197 | os << "Could not fully read file " << file_name; |
| 198 | return false; |
| 199 | } |
| 200 | |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 201 | std::string page_map_file_name = StringPrintf( |
| 202 | "/proc/%ld/pagemap", static_cast<long>(image_diff_pid)); // NOLINT [runtime/int] |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 203 | auto page_map_file = std::unique_ptr<File>(OS::OpenFileForReading(page_map_file_name.c_str())); |
| 204 | if (page_map_file == nullptr) { |
| 205 | os << "Failed to open " << page_map_file_name << " for reading: " << strerror(errno); |
| 206 | return false; |
| 207 | } |
| 208 | |
| 209 | // Not truly clean, mmap-ing boot.art again would be more pristine, but close enough |
| 210 | const char* clean_page_map_file_name = "/proc/self/pagemap"; |
| 211 | auto clean_page_map_file = std::unique_ptr<File>( |
| 212 | OS::OpenFileForReading(clean_page_map_file_name)); |
| 213 | if (clean_page_map_file == nullptr) { |
| 214 | os << "Failed to open " << clean_page_map_file_name << " for reading: " << strerror(errno); |
| 215 | return false; |
| 216 | } |
| 217 | |
| 218 | auto kpage_flags_file = std::unique_ptr<File>(OS::OpenFileForReading("/proc/kpageflags")); |
| 219 | if (kpage_flags_file == nullptr) { |
| 220 | os << "Failed to open /proc/kpageflags for reading: " << strerror(errno); |
| 221 | return false; |
| 222 | } |
| 223 | |
| 224 | auto kpage_count_file = std::unique_ptr<File>(OS::OpenFileForReading("/proc/kpagecount")); |
| 225 | if (kpage_count_file == nullptr) { |
| 226 | os << "Failed to open /proc/kpagecount for reading:" << strerror(errno); |
| 227 | return false; |
| 228 | } |
| 229 | |
Mathieu Chartier | 2cebb24 | 2015-04-21 16:50:40 -0700 | [diff] [blame] | 230 | // Set of the remote virtual page indices that are dirty |
| 231 | std::set<size_t> dirty_page_set_remote; |
| 232 | // Set of the local virtual page indices that are dirty |
| 233 | std::set<size_t> dirty_page_set_local; |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 234 | |
| 235 | size_t different_int32s = 0; |
| 236 | size_t different_bytes = 0; |
| 237 | size_t different_pages = 0; |
| 238 | size_t virtual_page_idx = 0; // Virtual page number (for an absolute memory address) |
| 239 | size_t page_idx = 0; // Page index relative to 0 |
| 240 | size_t previous_page_idx = 0; // Previous page index relative to 0 |
| 241 | size_t dirty_pages = 0; |
| 242 | size_t private_pages = 0; |
| 243 | size_t private_dirty_pages = 0; |
| 244 | |
| 245 | // Iterate through one page at a time. Boot map begin/end already implicitly aligned. |
| 246 | for (uintptr_t begin = boot_map.start; begin != boot_map.end; begin += kPageSize) { |
| 247 | ptrdiff_t offset = begin - boot_map.start; |
| 248 | |
| 249 | // We treat the image header as part of the memory map for now |
| 250 | // If we wanted to change this, we could pass base=start+sizeof(ImageHeader) |
| 251 | // But it might still be interesting to see if any of the ImageHeader data mutated |
| 252 | const uint8_t* local_ptr = reinterpret_cast<const uint8_t*>(&boot_image_header) + offset; |
| 253 | uint8_t* remote_ptr = &remote_contents[offset]; |
| 254 | |
| 255 | if (memcmp(local_ptr, remote_ptr, kPageSize) != 0) { |
| 256 | different_pages++; |
| 257 | |
| 258 | // Count the number of 32-bit integers that are different. |
| 259 | for (size_t i = 0; i < kPageSize / sizeof(uint32_t); ++i) { |
| 260 | uint32_t* remote_ptr_int32 = reinterpret_cast<uint32_t*>(remote_ptr); |
| 261 | const uint32_t* local_ptr_int32 = reinterpret_cast<const uint32_t*>(local_ptr); |
| 262 | |
| 263 | if (remote_ptr_int32[i] != local_ptr_int32[i]) { |
| 264 | different_int32s++; |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | // Iterate through one byte at a time. |
| 271 | for (uintptr_t begin = boot_map.start; begin != boot_map.end; ++begin) { |
| 272 | previous_page_idx = page_idx; |
| 273 | ptrdiff_t offset = begin - boot_map.start; |
| 274 | |
| 275 | // We treat the image header as part of the memory map for now |
| 276 | // If we wanted to change this, we could pass base=start+sizeof(ImageHeader) |
| 277 | // But it might still be interesting to see if any of the ImageHeader data mutated |
| 278 | const uint8_t* local_ptr = reinterpret_cast<const uint8_t*>(&boot_image_header) + offset; |
| 279 | uint8_t* remote_ptr = &remote_contents[offset]; |
| 280 | |
| 281 | virtual_page_idx = reinterpret_cast<uintptr_t>(local_ptr) / kPageSize; |
| 282 | |
| 283 | // Calculate the page index, relative to the 0th page where the image begins |
| 284 | page_idx = (offset + page_off_begin) / kPageSize; |
| 285 | if (*local_ptr != *remote_ptr) { |
| 286 | // Track number of bytes that are different |
| 287 | different_bytes++; |
| 288 | } |
| 289 | |
| 290 | // Independently count the # of dirty pages on the remote side |
| 291 | size_t remote_virtual_page_idx = begin / kPageSize; |
| 292 | if (previous_page_idx != page_idx) { |
| 293 | uint64_t page_count = 0xC0FFEE; |
| 294 | // TODO: virtual_page_idx needs to be from the same process |
| 295 | int dirtiness = (IsPageDirty(page_map_file.get(), // Image-diff-pid procmap |
| 296 | clean_page_map_file.get(), // Self procmap |
| 297 | kpage_flags_file.get(), |
| 298 | kpage_count_file.get(), |
| 299 | remote_virtual_page_idx, // potentially "dirty" page |
| 300 | virtual_page_idx, // true "clean" page |
| 301 | &page_count, |
| 302 | &error_msg)); |
| 303 | if (dirtiness < 0) { |
| 304 | os << error_msg; |
| 305 | return false; |
| 306 | } else if (dirtiness > 0) { |
| 307 | dirty_pages++; |
| 308 | dirty_page_set_remote.insert(dirty_page_set_remote.end(), remote_virtual_page_idx); |
| 309 | dirty_page_set_local.insert(dirty_page_set_local.end(), virtual_page_idx); |
| 310 | } |
| 311 | |
| 312 | bool is_dirty = dirtiness > 0; |
| 313 | bool is_private = page_count == 1; |
| 314 | |
| 315 | if (page_count == 1) { |
| 316 | private_pages++; |
| 317 | } |
| 318 | |
| 319 | if (is_dirty && is_private) { |
| 320 | private_dirty_pages++; |
| 321 | } |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | // Walk each object in the remote image space and compare it against ours |
| 326 | size_t different_objects = 0; |
| 327 | std::map<mirror::Class*, int /*count*/> dirty_object_class_map; |
| 328 | // Track only the byte-per-byte dirtiness (in bytes) |
| 329 | std::map<mirror::Class*, int /*byte_count*/> dirty_object_byte_count; |
| 330 | // Track the object-by-object dirtiness (in bytes) |
| 331 | std::map<mirror::Class*, int /*byte_count*/> dirty_object_size_in_bytes; |
| 332 | std::map<mirror::Class*, int /*count*/> clean_object_class_map; |
| 333 | |
| 334 | std::map<mirror::Class*, std::string> class_to_descriptor_map; |
| 335 | |
| 336 | std::map<off_t /* field offset */, int /* count */> art_method_field_dirty_count; |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 337 | std::vector<ArtMethod*> art_method_dirty_objects; |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 338 | |
| 339 | std::map<off_t /* field offset */, int /* count */> class_field_dirty_count; |
| 340 | std::vector<mirror::Class*> class_dirty_objects; |
| 341 | |
| 342 | // List of local objects that are clean, but located on dirty pages. |
| 343 | std::vector<mirror::Object*> false_dirty_objects; |
| 344 | std::map<mirror::Class*, int /*byte_count*/> false_dirty_byte_count; |
| 345 | std::map<mirror::Class*, int /*object_count*/> false_dirty_object_count; |
| 346 | std::map<mirror::Class*, std::vector<mirror::Object*>> false_dirty_objects_map; |
| 347 | size_t false_dirty_object_bytes = 0; |
| 348 | |
| 349 | // Remote pointers to dirty objects |
| 350 | std::map<mirror::Class*, std::vector<mirror::Object*>> dirty_objects_by_class; |
| 351 | // Look up remote classes by their descriptor |
| 352 | std::map<std::string, mirror::Class*> remote_class_map; |
| 353 | // Look up local classes by their descriptor |
| 354 | std::map<std::string, mirror::Class*> local_class_map; |
| 355 | |
| 356 | size_t dirty_object_bytes = 0; |
| 357 | { |
| 358 | const uint8_t* begin_image_ptr = image_begin_unaligned; |
Mathieu Chartier | c785344 | 2015-03-27 14:35:38 -0700 | [diff] [blame] | 359 | const uint8_t* end_image_ptr = image_mirror_end_unaligned; |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 360 | |
| 361 | const uint8_t* current = begin_image_ptr + RoundUp(sizeof(ImageHeader), kObjectAlignment); |
| 362 | while (reinterpret_cast<const uintptr_t>(current) |
| 363 | < reinterpret_cast<const uintptr_t>(end_image_ptr)) { |
| 364 | CHECK_ALIGNED(current, kObjectAlignment); |
| 365 | mirror::Object* obj = reinterpret_cast<mirror::Object*>(const_cast<uint8_t*>(current)); |
| 366 | |
| 367 | // Sanity check that we are reading a real object |
| 368 | CHECK(obj->GetClass() != nullptr) << "Image object at address " << obj << " has null class"; |
| 369 | if (kUseBakerOrBrooksReadBarrier) { |
| 370 | obj->AssertReadBarrierPointer(); |
| 371 | } |
| 372 | |
| 373 | // Iterate every page this object belongs to |
| 374 | bool on_dirty_page = false; |
| 375 | size_t page_off = 0; |
| 376 | size_t current_page_idx; |
| 377 | uintptr_t object_address; |
| 378 | do { |
| 379 | object_address = reinterpret_cast<uintptr_t>(current); |
| 380 | current_page_idx = object_address / kPageSize + page_off; |
| 381 | |
| 382 | if (dirty_page_set_local.find(current_page_idx) != dirty_page_set_local.end()) { |
| 383 | // This object is on a dirty page |
| 384 | on_dirty_page = true; |
| 385 | } |
| 386 | |
| 387 | page_off++; |
| 388 | } while ((current_page_idx * kPageSize) < |
| 389 | RoundUp(object_address + obj->SizeOf(), kObjectAlignment)); |
| 390 | |
| 391 | mirror::Class* klass = obj->GetClass(); |
| 392 | |
| 393 | bool different_object = false; |
| 394 | |
| 395 | // Check against the other object and see if they are different |
| 396 | ptrdiff_t offset = current - begin_image_ptr; |
| 397 | const uint8_t* current_remote = &remote_contents[offset]; |
| 398 | mirror::Object* remote_obj = reinterpret_cast<mirror::Object*>( |
| 399 | const_cast<uint8_t*>(current_remote)); |
| 400 | if (memcmp(current, current_remote, obj->SizeOf()) != 0) { |
| 401 | different_objects++; |
| 402 | dirty_object_bytes += obj->SizeOf(); |
| 403 | |
| 404 | ++dirty_object_class_map[klass]; |
| 405 | |
| 406 | // Go byte-by-byte and figure out what exactly got dirtied |
| 407 | size_t dirty_byte_count_per_object = 0; |
| 408 | for (size_t i = 0; i < obj->SizeOf(); ++i) { |
| 409 | if (current[i] != current_remote[i]) { |
| 410 | dirty_byte_count_per_object++; |
| 411 | } |
| 412 | } |
| 413 | dirty_object_byte_count[klass] += dirty_byte_count_per_object; |
| 414 | dirty_object_size_in_bytes[klass] += obj->SizeOf(); |
| 415 | |
| 416 | different_object = true; |
| 417 | |
| 418 | dirty_objects_by_class[klass].push_back(remote_obj); |
| 419 | } else { |
| 420 | ++clean_object_class_map[klass]; |
| 421 | } |
| 422 | |
| 423 | std::string descriptor = GetClassDescriptor(klass); |
| 424 | if (different_object) { |
| 425 | if (strcmp(descriptor.c_str(), "Ljava/lang/Class;") == 0) { |
| 426 | // this is a "Class" |
| 427 | mirror::Class* obj_as_class = reinterpret_cast<mirror::Class*>(remote_obj); |
| 428 | |
| 429 | // print the fields that are dirty |
| 430 | for (size_t i = 0; i < obj->SizeOf(); ++i) { |
| 431 | if (current[i] != current_remote[i]) { |
| 432 | class_field_dirty_count[i]++; |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | class_dirty_objects.push_back(obj_as_class); |
| 437 | } else if (strcmp(descriptor.c_str(), "Ljava/lang/reflect/ArtMethod;") == 0) { |
| 438 | // this is an ArtMethod |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 439 | ArtMethod* art_method = reinterpret_cast<ArtMethod*>(remote_obj); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 440 | |
| 441 | // print the fields that are dirty |
| 442 | for (size_t i = 0; i < obj->SizeOf(); ++i) { |
| 443 | if (current[i] != current_remote[i]) { |
| 444 | art_method_field_dirty_count[i]++; |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | art_method_dirty_objects.push_back(art_method); |
| 449 | } |
| 450 | } else if (on_dirty_page) { |
| 451 | // This object was either never mutated or got mutated back to the same value. |
| 452 | // TODO: Do I want to distinguish a "different" vs a "dirty" page here? |
| 453 | false_dirty_objects.push_back(obj); |
| 454 | false_dirty_objects_map[klass].push_back(obj); |
| 455 | false_dirty_object_bytes += obj->SizeOf(); |
| 456 | false_dirty_byte_count[obj->GetClass()] += obj->SizeOf(); |
| 457 | false_dirty_object_count[obj->GetClass()] += 1; |
| 458 | } |
| 459 | |
| 460 | if (strcmp(descriptor.c_str(), "Ljava/lang/Class;") == 0) { |
| 461 | local_class_map[descriptor] = reinterpret_cast<mirror::Class*>(obj); |
| 462 | remote_class_map[descriptor] = reinterpret_cast<mirror::Class*>(remote_obj); |
| 463 | } |
| 464 | |
| 465 | // Unconditionally store the class descriptor in case we need it later |
| 466 | class_to_descriptor_map[klass] = descriptor; |
| 467 | current += RoundUp(obj->SizeOf(), kObjectAlignment); |
| 468 | } |
| 469 | } |
| 470 | |
| 471 | // Looking at only dirty pages, figure out how many of those bytes belong to dirty objects. |
| 472 | float true_dirtied_percent = dirty_object_bytes * 1.0f / (dirty_pages * kPageSize); |
| 473 | size_t false_dirty_pages = dirty_pages - different_pages; |
| 474 | |
| 475 | os << "Mapping at [" << reinterpret_cast<void*>(boot_map.start) << ", " |
| 476 | << reinterpret_cast<void*>(boot_map.end) << ") had: \n " |
| 477 | << different_bytes << " differing bytes, \n " |
| 478 | << different_int32s << " differing int32s, \n " |
| 479 | << different_objects << " different objects, \n " |
| 480 | << dirty_object_bytes << " different object [bytes], \n " |
| 481 | << false_dirty_objects.size() << " false dirty objects,\n " |
| 482 | << false_dirty_object_bytes << " false dirty object [bytes], \n " |
| 483 | << true_dirtied_percent << " different objects-vs-total in a dirty page;\n " |
| 484 | << different_pages << " different pages; \n " |
| 485 | << dirty_pages << " pages are dirty; \n " |
| 486 | << false_dirty_pages << " pages are false dirty; \n " |
| 487 | << private_pages << " pages are private; \n " |
| 488 | << private_dirty_pages << " pages are Private_Dirty\n " |
| 489 | << ""; |
| 490 | |
| 491 | // vector of pairs (int count, Class*) |
| 492 | auto dirty_object_class_values = SortByValueDesc(dirty_object_class_map); |
| 493 | auto clean_object_class_values = SortByValueDesc(clean_object_class_map); |
| 494 | |
| 495 | os << "\n" << " Dirty object count by class:\n"; |
| 496 | for (const auto& vk_pair : dirty_object_class_values) { |
| 497 | int dirty_object_count = vk_pair.first; |
| 498 | mirror::Class* klass = vk_pair.second; |
| 499 | int object_sizes = dirty_object_size_in_bytes[klass]; |
| 500 | float avg_dirty_bytes_per_class = dirty_object_byte_count[klass] * 1.0f / object_sizes; |
| 501 | float avg_object_size = object_sizes * 1.0f / dirty_object_count; |
| 502 | const std::string& descriptor = class_to_descriptor_map[klass]; |
| 503 | os << " " << PrettyClass(klass) << " (" |
| 504 | << "objects: " << dirty_object_count << ", " |
| 505 | << "avg dirty bytes: " << avg_dirty_bytes_per_class << ", " |
| 506 | << "avg object size: " << avg_object_size << ", " |
| 507 | << "class descriptor: '" << descriptor << "'" |
| 508 | << ")\n"; |
| 509 | |
| 510 | constexpr size_t kMaxAddressPrint = 5; |
| 511 | if (strcmp(descriptor.c_str(), "Ljava/lang/reflect/ArtMethod;") == 0) { |
| 512 | os << " sample object addresses: "; |
| 513 | for (size_t i = 0; i < art_method_dirty_objects.size() && i < kMaxAddressPrint; ++i) { |
| 514 | auto art_method = art_method_dirty_objects[i]; |
| 515 | |
| 516 | os << reinterpret_cast<void*>(art_method) << ", "; |
| 517 | } |
| 518 | os << "\n"; |
| 519 | |
| 520 | os << " dirty byte +offset:count list = "; |
| 521 | auto art_method_field_dirty_count_sorted = SortByValueDesc(art_method_field_dirty_count); |
| 522 | for (auto pair : art_method_field_dirty_count_sorted) { |
| 523 | off_t offset = pair.second; |
| 524 | int count = pair.first; |
| 525 | |
| 526 | os << "+" << offset << ":" << count << ", "; |
| 527 | } |
| 528 | |
| 529 | os << "\n"; |
| 530 | |
| 531 | os << " field contents:\n"; |
| 532 | const auto& dirty_objects_list = dirty_objects_by_class[klass]; |
| 533 | for (mirror::Object* obj : dirty_objects_list) { |
| 534 | // remote method |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 535 | auto art_method = reinterpret_cast<ArtMethod*>(obj); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 536 | |
| 537 | // remote class |
| 538 | mirror::Class* remote_declaring_class = |
| 539 | FixUpRemotePointer(art_method->GetDeclaringClass(), remote_contents, boot_map); |
| 540 | |
| 541 | // local class |
| 542 | mirror::Class* declaring_class = |
| 543 | RemoteContentsPointerToLocal(remote_declaring_class, |
| 544 | remote_contents, |
| 545 | boot_image_header); |
| 546 | |
| 547 | os << " " << reinterpret_cast<void*>(obj) << " "; |
| 548 | os << " entryPointFromJni: " |
| 549 | << reinterpret_cast<const void*>( |
| 550 | art_method->GetEntryPointFromJniPtrSize(pointer_size)) << ", "; |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 551 | os << " entryPointFromQuickCompiledCode: " |
| 552 | << reinterpret_cast<const void*>( |
| 553 | art_method->GetEntryPointFromQuickCompiledCodePtrSize(pointer_size)) |
| 554 | << ", "; |
| 555 | os << " isNative? " << (art_method->IsNative() ? "yes" : "no") << ", "; |
| 556 | os << " class_status (local): " << declaring_class->GetStatus(); |
| 557 | os << " class_status (remote): " << remote_declaring_class->GetStatus(); |
| 558 | os << "\n"; |
| 559 | } |
| 560 | } |
| 561 | if (strcmp(descriptor.c_str(), "Ljava/lang/Class;") == 0) { |
| 562 | os << " sample object addresses: "; |
| 563 | for (size_t i = 0; i < class_dirty_objects.size() && i < kMaxAddressPrint; ++i) { |
| 564 | auto class_ptr = class_dirty_objects[i]; |
| 565 | |
| 566 | os << reinterpret_cast<void*>(class_ptr) << ", "; |
| 567 | } |
| 568 | os << "\n"; |
| 569 | |
| 570 | os << " dirty byte +offset:count list = "; |
| 571 | auto class_field_dirty_count_sorted = SortByValueDesc(class_field_dirty_count); |
| 572 | for (auto pair : class_field_dirty_count_sorted) { |
| 573 | off_t offset = pair.second; |
| 574 | int count = pair.first; |
| 575 | |
| 576 | os << "+" << offset << ":" << count << ", "; |
| 577 | } |
| 578 | os << "\n"; |
| 579 | |
| 580 | os << " field contents:\n"; |
| 581 | const auto& dirty_objects_list = dirty_objects_by_class[klass]; |
| 582 | for (mirror::Object* obj : dirty_objects_list) { |
| 583 | // remote class object |
| 584 | auto remote_klass = reinterpret_cast<mirror::Class*>(obj); |
| 585 | |
| 586 | // local class object |
| 587 | auto local_klass = RemoteContentsPointerToLocal(remote_klass, |
| 588 | remote_contents, |
| 589 | boot_image_header); |
| 590 | |
| 591 | os << " " << reinterpret_cast<void*>(obj) << " "; |
| 592 | os << " class_status (remote): " << remote_klass->GetStatus() << ", "; |
| 593 | os << " class_status (local): " << local_klass->GetStatus(); |
| 594 | os << "\n"; |
| 595 | } |
| 596 | } |
| 597 | } |
| 598 | |
| 599 | auto false_dirty_object_class_values = SortByValueDesc(false_dirty_object_count); |
| 600 | |
| 601 | os << "\n" << " False-dirty object count by class:\n"; |
| 602 | for (const auto& vk_pair : false_dirty_object_class_values) { |
| 603 | int object_count = vk_pair.first; |
| 604 | mirror::Class* klass = vk_pair.second; |
| 605 | int object_sizes = false_dirty_byte_count[klass]; |
| 606 | float avg_object_size = object_sizes * 1.0f / object_count; |
| 607 | const std::string& descriptor = class_to_descriptor_map[klass]; |
| 608 | os << " " << PrettyClass(klass) << " (" |
| 609 | << "objects: " << object_count << ", " |
| 610 | << "avg object size: " << avg_object_size << ", " |
| 611 | << "total bytes: " << object_sizes << ", " |
| 612 | << "class descriptor: '" << descriptor << "'" |
| 613 | << ")\n"; |
| 614 | |
| 615 | if (strcmp(descriptor.c_str(), "Ljava/lang/reflect/ArtMethod;") == 0) { |
| 616 | auto& art_method_false_dirty_objects = false_dirty_objects_map[klass]; |
| 617 | |
| 618 | os << " field contents:\n"; |
| 619 | for (mirror::Object* obj : art_method_false_dirty_objects) { |
| 620 | // local method |
Mathieu Chartier | e401d14 | 2015-04-22 13:56:20 -0700 | [diff] [blame] | 621 | auto art_method = reinterpret_cast<ArtMethod*>(obj); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 622 | |
| 623 | // local class |
| 624 | mirror::Class* declaring_class = art_method->GetDeclaringClass(); |
| 625 | |
| 626 | os << " " << reinterpret_cast<void*>(obj) << " "; |
| 627 | os << " entryPointFromJni: " |
| 628 | << reinterpret_cast<const void*>( |
| 629 | art_method->GetEntryPointFromJniPtrSize(pointer_size)) << ", "; |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 630 | os << " entryPointFromQuickCompiledCode: " |
| 631 | << reinterpret_cast<const void*>( |
| 632 | art_method->GetEntryPointFromQuickCompiledCodePtrSize(pointer_size)) |
| 633 | << ", "; |
| 634 | os << " isNative? " << (art_method->IsNative() ? "yes" : "no") << ", "; |
| 635 | os << " class_status (local): " << declaring_class->GetStatus(); |
| 636 | os << "\n"; |
| 637 | } |
| 638 | } |
| 639 | } |
| 640 | |
| 641 | os << "\n" << " Clean object count by class:\n"; |
| 642 | for (const auto& vk_pair : clean_object_class_values) { |
| 643 | os << " " << PrettyClass(vk_pair.second) << " (" << vk_pair.first << ")\n"; |
| 644 | } |
| 645 | |
| 646 | return true; |
| 647 | } |
| 648 | |
| 649 | // Fixup a remote pointer that we read from a foreign boot.art to point to our own memory. |
| 650 | // Returned pointer will point to inside of remote_contents. |
| 651 | template <typename T> |
| 652 | static T* FixUpRemotePointer(T* remote_ptr, |
| 653 | std::vector<uint8_t>& remote_contents, |
| 654 | const backtrace_map_t& boot_map) { |
| 655 | if (remote_ptr == nullptr) { |
| 656 | return nullptr; |
| 657 | } |
| 658 | |
| 659 | uintptr_t remote = reinterpret_cast<uintptr_t>(remote_ptr); |
| 660 | |
| 661 | CHECK_LE(boot_map.start, remote); |
| 662 | CHECK_GT(boot_map.end, remote); |
| 663 | |
| 664 | off_t boot_offset = remote - boot_map.start; |
| 665 | |
| 666 | return reinterpret_cast<T*>(&remote_contents[boot_offset]); |
| 667 | } |
| 668 | |
| 669 | template <typename T> |
| 670 | static T* RemoteContentsPointerToLocal(T* remote_ptr, |
| 671 | std::vector<uint8_t>& remote_contents, |
| 672 | const ImageHeader& image_header) { |
| 673 | if (remote_ptr == nullptr) { |
| 674 | return nullptr; |
| 675 | } |
| 676 | |
| 677 | uint8_t* remote = reinterpret_cast<uint8_t*>(remote_ptr); |
| 678 | ptrdiff_t boot_offset = remote - &remote_contents[0]; |
| 679 | |
| 680 | const uint8_t* local_ptr = reinterpret_cast<const uint8_t*>(&image_header) + boot_offset; |
| 681 | |
| 682 | return reinterpret_cast<T*>(const_cast<uint8_t*>(local_ptr)); |
| 683 | } |
| 684 | |
| 685 | static std::string GetClassDescriptor(mirror::Class* klass) |
Mathieu Chartier | 9044347 | 2015-07-16 20:32:27 -0700 | [diff] [blame] | 686 | SHARED_REQUIRES(Locks::mutator_lock_) { |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 687 | CHECK(klass != nullptr); |
| 688 | |
| 689 | std::string descriptor; |
| 690 | const char* descriptor_str = klass->GetDescriptor(&descriptor); |
| 691 | |
| 692 | return std::string(descriptor_str); |
| 693 | } |
| 694 | |
| 695 | template <typename K, typename V> |
| 696 | static std::vector<std::pair<V, K>> SortByValueDesc(const std::map<K, V> map) { |
| 697 | // Store value->key so that we can use the default sort from pair which |
| 698 | // sorts by value first and then key |
| 699 | std::vector<std::pair<V, K>> value_key_vector; |
| 700 | |
| 701 | for (const auto& kv_pair : map) { |
| 702 | value_key_vector.push_back(std::make_pair(kv_pair.second, kv_pair.first)); |
| 703 | } |
| 704 | |
| 705 | // Sort in reverse (descending order) |
| 706 | std::sort(value_key_vector.rbegin(), value_key_vector.rend()); |
| 707 | return value_key_vector; |
| 708 | } |
| 709 | |
| 710 | static bool GetPageFrameNumber(File* page_map_file, |
| 711 | size_t virtual_page_index, |
| 712 | uint64_t* page_frame_number, |
| 713 | std::string* error_msg) { |
| 714 | CHECK(page_map_file != nullptr); |
| 715 | CHECK(page_frame_number != nullptr); |
| 716 | CHECK(error_msg != nullptr); |
| 717 | |
| 718 | constexpr size_t kPageMapEntrySize = sizeof(uint64_t); |
| 719 | constexpr uint64_t kPageFrameNumberMask = (1ULL << 55) - 1; // bits 0-54 [in /proc/$pid/pagemap] |
| 720 | constexpr uint64_t kPageSoftDirtyMask = (1ULL << 55); // bit 55 [in /proc/$pid/pagemap] |
| 721 | |
| 722 | uint64_t page_map_entry = 0; |
| 723 | |
| 724 | // Read 64-bit entry from /proc/$pid/pagemap to get the physical page frame number |
| 725 | if (!page_map_file->PreadFully(&page_map_entry, kPageMapEntrySize, |
| 726 | virtual_page_index * kPageMapEntrySize)) { |
| 727 | *error_msg = StringPrintf("Failed to read the virtual page index entry from %s", |
| 728 | page_map_file->GetPath().c_str()); |
| 729 | return false; |
| 730 | } |
| 731 | |
| 732 | // TODO: seems useless, remove this. |
| 733 | bool soft_dirty = (page_map_entry & kPageSoftDirtyMask) != 0; |
| 734 | if ((false)) { |
| 735 | LOG(VERBOSE) << soft_dirty; // Suppress unused warning |
| 736 | UNREACHABLE(); |
| 737 | } |
| 738 | |
| 739 | *page_frame_number = page_map_entry & kPageFrameNumberMask; |
| 740 | |
| 741 | return true; |
| 742 | } |
| 743 | |
| 744 | static int IsPageDirty(File* page_map_file, |
| 745 | File* clean_page_map_file, |
| 746 | File* kpage_flags_file, |
| 747 | File* kpage_count_file, |
| 748 | size_t virtual_page_idx, |
| 749 | size_t clean_virtual_page_idx, |
| 750 | // Out parameters: |
| 751 | uint64_t* page_count, std::string* error_msg) { |
| 752 | CHECK(page_map_file != nullptr); |
| 753 | CHECK(clean_page_map_file != nullptr); |
| 754 | CHECK_NE(page_map_file, clean_page_map_file); |
| 755 | CHECK(kpage_flags_file != nullptr); |
| 756 | CHECK(kpage_count_file != nullptr); |
| 757 | CHECK(page_count != nullptr); |
| 758 | CHECK(error_msg != nullptr); |
| 759 | |
| 760 | // Constants are from https://www.kernel.org/doc/Documentation/vm/pagemap.txt |
| 761 | |
| 762 | constexpr size_t kPageFlagsEntrySize = sizeof(uint64_t); |
| 763 | constexpr size_t kPageCountEntrySize = sizeof(uint64_t); |
| 764 | constexpr uint64_t kPageFlagsDirtyMask = (1ULL << 4); // in /proc/kpageflags |
| 765 | constexpr uint64_t kPageFlagsNoPageMask = (1ULL << 20); // in /proc/kpageflags |
| 766 | constexpr uint64_t kPageFlagsMmapMask = (1ULL << 11); // in /proc/kpageflags |
| 767 | |
| 768 | uint64_t page_frame_number = 0; |
| 769 | if (!GetPageFrameNumber(page_map_file, virtual_page_idx, &page_frame_number, error_msg)) { |
| 770 | return -1; |
| 771 | } |
| 772 | |
| 773 | uint64_t page_frame_number_clean = 0; |
| 774 | if (!GetPageFrameNumber(clean_page_map_file, clean_virtual_page_idx, &page_frame_number_clean, |
| 775 | error_msg)) { |
| 776 | return -1; |
| 777 | } |
| 778 | |
| 779 | // Read 64-bit entry from /proc/kpageflags to get the dirty bit for a page |
| 780 | uint64_t kpage_flags_entry = 0; |
| 781 | if (!kpage_flags_file->PreadFully(&kpage_flags_entry, |
| 782 | kPageFlagsEntrySize, |
| 783 | page_frame_number * kPageFlagsEntrySize)) { |
| 784 | *error_msg = StringPrintf("Failed to read the page flags from %s", |
| 785 | kpage_flags_file->GetPath().c_str()); |
| 786 | return -1; |
| 787 | } |
| 788 | |
| 789 | // Read 64-bit entyry from /proc/kpagecount to get mapping counts for a page |
| 790 | if (!kpage_count_file->PreadFully(page_count /*out*/, |
| 791 | kPageCountEntrySize, |
| 792 | page_frame_number * kPageCountEntrySize)) { |
| 793 | *error_msg = StringPrintf("Failed to read the page count from %s", |
| 794 | kpage_count_file->GetPath().c_str()); |
| 795 | return -1; |
| 796 | } |
| 797 | |
| 798 | // There must be a page frame at the requested address. |
| 799 | CHECK_EQ(kpage_flags_entry & kPageFlagsNoPageMask, 0u); |
| 800 | // The page frame must be memory mapped |
| 801 | CHECK_NE(kpage_flags_entry & kPageFlagsMmapMask, 0u); |
| 802 | |
| 803 | // Page is dirty, i.e. has diverged from file, if the 4th bit is set to 1 |
| 804 | bool flags_dirty = (kpage_flags_entry & kPageFlagsDirtyMask) != 0; |
| 805 | |
| 806 | // page_frame_number_clean must come from the *same* process |
| 807 | // but a *different* mmap than page_frame_number |
| 808 | if (flags_dirty) { |
| 809 | CHECK_NE(page_frame_number, page_frame_number_clean); |
| 810 | } |
| 811 | |
| 812 | return page_frame_number != page_frame_number_clean; |
| 813 | } |
| 814 | |
| 815 | static const ImageHeader& GetBootImageHeader() { |
| 816 | gc::Heap* heap = Runtime::Current()->GetHeap(); |
Mathieu Chartier | 073b16c | 2015-11-10 14:13:23 -0800 | [diff] [blame] | 817 | gc::space::ImageSpace* image_space = heap->GetBootImageSpace(); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 818 | CHECK(image_space != nullptr); |
| 819 | const ImageHeader& image_header = image_space->GetImageHeader(); |
| 820 | return image_header; |
| 821 | } |
| 822 | |
| 823 | private: |
| 824 | // Return the image location, stripped of any directories, e.g. "boot.art" or "core.art" |
| 825 | std::string GetImageLocationBaseName() const { |
| 826 | return BaseName(std::string(image_location_)); |
| 827 | } |
| 828 | |
| 829 | std::ostream* os_; |
| 830 | const ImageHeader& image_header_; |
| 831 | const char* image_location_; |
| 832 | pid_t image_diff_pid_; // Dump image diff against boot.art if pid is non-negative |
| 833 | |
| 834 | DISALLOW_COPY_AND_ASSIGN(ImgDiagDumper); |
| 835 | }; |
| 836 | |
| 837 | static int DumpImage(Runtime* runtime, const char* image_location, |
| 838 | std::ostream* os, pid_t image_diff_pid) { |
| 839 | ScopedObjectAccess soa(Thread::Current()); |
| 840 | gc::Heap* heap = runtime->GetHeap(); |
Mathieu Chartier | 073b16c | 2015-11-10 14:13:23 -0800 | [diff] [blame] | 841 | gc::space::ImageSpace* image_space = heap->GetBootImageSpace(); |
Igor Murashkin | 3774335 | 2014-11-13 14:38:00 -0800 | [diff] [blame] | 842 | CHECK(image_space != nullptr); |
| 843 | const ImageHeader& image_header = image_space->GetImageHeader(); |
| 844 | if (!image_header.IsValid()) { |
| 845 | fprintf(stderr, "Invalid image header %s\n", image_location); |
| 846 | return EXIT_FAILURE; |
| 847 | } |
| 848 | |
| 849 | ImgDiagDumper img_diag_dumper(os, image_header, image_location, image_diff_pid); |
| 850 | |
| 851 | bool success = img_diag_dumper.Dump(); |
| 852 | return (success) ? EXIT_SUCCESS : EXIT_FAILURE; |
| 853 | } |
| 854 | |
| 855 | struct ImgDiagArgs : public CmdlineArgs { |
| 856 | protected: |
| 857 | using Base = CmdlineArgs; |
| 858 | |
| 859 | virtual ParseStatus ParseCustom(const StringPiece& option, |
| 860 | std::string* error_msg) OVERRIDE { |
| 861 | { |
| 862 | ParseStatus base_parse = Base::ParseCustom(option, error_msg); |
| 863 | if (base_parse != kParseUnknownArgument) { |
| 864 | return base_parse; |
| 865 | } |
| 866 | } |
| 867 | |
| 868 | if (option.starts_with("--image-diff-pid=")) { |
| 869 | const char* image_diff_pid = option.substr(strlen("--image-diff-pid=")).data(); |
| 870 | |
| 871 | if (!ParseInt(image_diff_pid, &image_diff_pid_)) { |
| 872 | *error_msg = "Image diff pid out of range"; |
| 873 | return kParseError; |
| 874 | } |
| 875 | } else { |
| 876 | return kParseUnknownArgument; |
| 877 | } |
| 878 | |
| 879 | return kParseOk; |
| 880 | } |
| 881 | |
| 882 | virtual ParseStatus ParseChecks(std::string* error_msg) OVERRIDE { |
| 883 | // Perform the parent checks. |
| 884 | ParseStatus parent_checks = Base::ParseChecks(error_msg); |
| 885 | if (parent_checks != kParseOk) { |
| 886 | return parent_checks; |
| 887 | } |
| 888 | |
| 889 | // Perform our own checks. |
| 890 | |
| 891 | if (kill(image_diff_pid_, |
| 892 | /*sig*/0) != 0) { // No signal is sent, perform error-checking only. |
| 893 | // Check if the pid exists before proceeding. |
| 894 | if (errno == ESRCH) { |
| 895 | *error_msg = "Process specified does not exist"; |
| 896 | } else { |
| 897 | *error_msg = StringPrintf("Failed to check process status: %s", strerror(errno)); |
| 898 | } |
| 899 | return kParseError; |
| 900 | } else if (instruction_set_ != kRuntimeISA) { |
| 901 | // Don't allow different ISAs since the images are ISA-specific. |
| 902 | // Right now the code assumes both the runtime ISA and the remote ISA are identical. |
| 903 | *error_msg = "Must use the default runtime ISA; changing ISA is not supported."; |
| 904 | return kParseError; |
| 905 | } |
| 906 | |
| 907 | return kParseOk; |
| 908 | } |
| 909 | |
| 910 | virtual std::string GetUsage() const { |
| 911 | std::string usage; |
| 912 | |
| 913 | usage += |
| 914 | "Usage: imgdiag [options] ...\n" |
| 915 | " Example: imgdiag --image-diff-pid=$(pidof dex2oat)\n" |
| 916 | " Example: adb shell imgdiag --image-diff-pid=$(pid zygote)\n" |
| 917 | "\n"; |
| 918 | |
| 919 | usage += Base::GetUsage(); |
| 920 | |
| 921 | usage += // Optional. |
| 922 | " --image-diff-pid=<pid>: provide the PID of a process whose boot.art you want to diff.\n" |
| 923 | " Example: --image-diff-pid=$(pid zygote)\n" |
| 924 | "\n"; |
| 925 | |
| 926 | return usage; |
| 927 | } |
| 928 | |
| 929 | public: |
| 930 | pid_t image_diff_pid_ = -1; |
| 931 | }; |
| 932 | |
| 933 | struct ImgDiagMain : public CmdlineMain<ImgDiagArgs> { |
| 934 | virtual bool ExecuteWithRuntime(Runtime* runtime) { |
| 935 | CHECK(args_ != nullptr); |
| 936 | |
| 937 | return DumpImage(runtime, |
| 938 | args_->boot_image_location_, |
| 939 | args_->os_, |
| 940 | args_->image_diff_pid_) == EXIT_SUCCESS; |
| 941 | } |
| 942 | }; |
| 943 | |
| 944 | } // namespace art |
| 945 | |
| 946 | int main(int argc, char** argv) { |
| 947 | art::ImgDiagMain main; |
| 948 | return main.Main(argc, argv); |
| 949 | } |