1 /*
2 * Copyright 2017, 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 #define DEBUG false // STOPSHIP if true
18 #include "Log.h"
19
20 #include <sstream>
21 #include "MemoryLeakTrackUtil.h"
22
23 /*
24 * The code here originally resided in MediaPlayerService.cpp
25 */
26
27 // Figure out the abi based on defined macros.
28 #if defined(__arm__)
29 #define ABI_STRING "arm"
30 #elif defined(__aarch64__)
31 #define ABI_STRING "arm64"
32 #elif defined(__mips__) && !defined(__LP64__)
33 #define ABI_STRING "mips"
34 #elif defined(__mips__) && defined(__LP64__)
35 #define ABI_STRING "mips64"
36 #elif defined(__i386__)
37 #define ABI_STRING "x86"
38 #elif defined(__x86_64__)
39 #define ABI_STRING "x86_64"
40 #else
41 #error "Unsupported ABI"
42 #endif
43
44 extern std::string backtrace_string(const uintptr_t* frames, size_t frame_count);
45
46 namespace android {
47 namespace os {
48 namespace statsd {
49
50 extern "C" void get_malloc_leak_info(uint8_t** info, size_t* overallSize, size_t* infoSize,
51 size_t* totalMemory, size_t* backtraceSize);
52
53 extern "C" void free_malloc_leak_info(uint8_t* info);
54
dumpMemInfo(size_t limit)55 std::string dumpMemInfo(size_t limit) {
56 uint8_t* info;
57 size_t overallSize;
58 size_t infoSize;
59 size_t totalMemory;
60 size_t backtraceSize;
61 get_malloc_leak_info(&info, &overallSize, &infoSize, &totalMemory, &backtraceSize);
62
63 size_t count;
64 if (info == nullptr || overallSize == 0 || infoSize == 0 ||
65 (count = overallSize / infoSize) == 0) {
66 VLOG("no malloc info, libc.debug.malloc.program property should be set");
67 return std::string();
68 }
69
70 std::ostringstream oss;
71 oss << totalMemory << " bytes in " << count << " allocations\n";
72 oss << " ABI: '" ABI_STRING "'"
73 << "\n\n";
74 if (count > limit) count = limit;
75
76 // The memory is sorted based on total size which is useful for finding
77 // worst memory offenders. For diffs, sometimes it is preferable to sort
78 // based on the backtrace.
79 for (size_t i = 0; i < count; i++) {
80 struct AllocEntry {
81 size_t size; // bit 31 is set if this is zygote allocated memory
82 size_t allocations;
83 uintptr_t backtrace[];
84 };
85
86 const AllocEntry* const e = (AllocEntry*)(info + i * infoSize);
87
88 oss << (e->size * e->allocations) << " bytes ( " << e->size << " bytes * " << e->allocations
89 << " allocations )\n";
90 oss << backtrace_string(e->backtrace, backtraceSize) << "\n";
91 }
92 oss << "\n";
93 free_malloc_leak_info(info);
94 return oss.str();
95 }
96
97 } // namespace statsd
98 } // namespace os
99 } // namespace android