1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef BASE_PROCESS_MEMORY_H_ 6 #define BASE_PROCESS_MEMORY_H_ 7 8 #include "base/base_export.h" 9 #include "base/basictypes.h" 10 #include "base/process/process_handle.h" 11 #include "build/build_config.h" 12 13 #if defined(OS_WIN) 14 #include <windows.h> 15 #endif 16 17 namespace base { 18 19 // Enables low fragmentation heap (LFH) for every heaps of this process. This 20 // won't have any effect on heaps created after this function call. It will not 21 // modify data allocated in the heaps before calling this function. So it is 22 // better to call this function early in initialization and again before 23 // entering the main loop. 24 // Note: Returns true on Windows 2000 without doing anything. 25 BASE_EXPORT bool EnableLowFragmentationHeap(); 26 27 // Enables 'terminate on heap corruption' flag. Helps protect against heap 28 // overflow. Has no effect if the OS doesn't provide the necessary facility. 29 BASE_EXPORT void EnableTerminationOnHeapCorruption(); 30 31 // Turns on process termination if memory runs out. 32 BASE_EXPORT void EnableTerminationOnOutOfMemory(); 33 34 #if defined(OS_WIN) 35 // Returns the module handle to which an address belongs. The reference count 36 // of the module is not incremented. 37 BASE_EXPORT HMODULE GetModuleFromAddress(void* address); 38 #endif 39 40 #if defined(OS_LINUX) || defined(OS_ANDROID) 41 BASE_EXPORT extern size_t g_oom_size; 42 43 // The maximum allowed value for the OOM score. 44 const int kMaxOomScore = 1000; 45 46 // This adjusts /proc/<pid>/oom_score_adj so the Linux OOM killer will 47 // prefer to kill certain process types over others. The range for the 48 // adjustment is [-1000, 1000], with [0, 1000] being user accessible. 49 // If the Linux system doesn't support the newer oom_score_adj range 50 // of [0, 1000], then we revert to using the older oom_adj, and 51 // translate the given value into [0, 15]. Some aliasing of values 52 // may occur in that case, of course. 53 BASE_EXPORT bool AdjustOOMScore(ProcessId process, int score); 54 #endif 55 56 #if defined(OS_MACOSX) 57 // Very large images or svg canvases can cause huge mallocs. Skia 58 // does tricks on tcmalloc-based systems to allow malloc to fail with 59 // a NULL rather than hit the oom crasher. This replicates that for 60 // OSX. 61 // 62 // IF YOU USE THIS WITHOUT CONSULTING YOUR FRIENDLY OSX DEVELOPER, 63 // YOUR CODE IS LIKELY TO BE REVERTED. THANK YOU. 64 BASE_EXPORT void* UncheckedMalloc(size_t size); 65 BASE_EXPORT void* UncheckedCalloc(size_t num_items, size_t size); 66 #endif // defined(OS_MACOSX) 67 68 } // namespace base 69 70 #endif // BASE_PROCESS_MEMORY_H_ 71