| /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| // Some Linux kernels -- specifically, newer versions of Android and |
| // some B2G devices -- have a feature for assigning names to ranges of |
| // anonymous memory (i.e., memory that doesn't have a "name" in the |
| // form of an underlying mapped file). These names are reported in |
| // /proc/<pid>/smaps alongside system-level memory usage information |
| // such as Proportional Set Size (memory usage adjusted for sharing |
| // between processes), which allows reporting this information at a |
| // finer granularity than would otherwise be possible (e.g., |
| // separating malloc() heap from JS heap). |
| // |
| // Existing memory can be tagged with MozTagAnonymousMemory(); it will |
| // tag the range of complete pages containing the given interval, so |
| // the results may be inexact if the range isn't page-aligned. |
| // MozTaggedAnonymousMmap() can be used like mmap() with an extra |
| // parameter, and will tag the returned memory if the mapping was |
| // successful (and if it was in fact anonymous). |
| // |
| // NOTE: The pointer given as the "tag" argument MUST remain valid as |
| // long as the mapping exists. The referenced string is read when |
| // /proc/<pid>/smaps or /proc/<pid>/maps is read, not when the tag is |
| // established, so freeing it or changing its contents will have |
| // unexpected results. Using a static string is probably best. |
| // |
| // Also note that this header can be used by both C and C++ code. |
| |
| #ifndef mozilla_TaggedAnonymousMemory_h |
| #define mozilla_TaggedAnonymousMemory_h |
| |
| #if defined(STARBOARD) |
| |
| #include "starboard/log.h" |
| #include "starboard/memory.h" |
| |
| static inline void |
| MozTagAnonymousMemory(const void* aPtr, size_t aLength, const char* aTag) |
| { |
| } |
| |
| static inline void* |
| MozTaggedAnonymousMmap(void* aAddr, size_t aLength, int aProt, int aFlags, |
| int aFd, int64_t aOffset, const char* aTag) |
| { |
| // Starboard has no concept of passing an address into mmap. |
| SB_DCHECK(aAddr == nullptr); |
| return SbMemoryMap(aLength, aProt, aTag); |
| } |
| |
| static inline int |
| MozTaggedMemoryIsSupported(void) |
| { |
| return 0; |
| } |
| |
| #elif !defined(XP_WIN) |
| |
| #include <sys/types.h> |
| #include <sys/mman.h> |
| |
| #include "mozilla/Types.h" |
| |
| #ifdef ANDROID |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| MFBT_API void |
| MozTagAnonymousMemory(const void* aPtr, size_t aLength, const char* aTag); |
| |
| MFBT_API void* |
| MozTaggedAnonymousMmap(void* aAddr, size_t aLength, int aProt, int aFlags, |
| int aFd, off_t aOffset, const char* aTag); |
| |
| MFBT_API int |
| MozTaggedMemoryIsSupported(void); |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #else // ANDROID |
| |
| static inline void |
| MozTagAnonymousMemory(const void* aPtr, size_t aLength, const char* aTag) |
| { |
| } |
| |
| static inline void* |
| MozTaggedAnonymousMmap(void* aAddr, size_t aLength, int aProt, int aFlags, |
| int aFd, off_t aOffset, const char* aTag) |
| { |
| return mmap(aAddr, aLength, aProt, aFlags, aFd, aOffset); |
| } |
| |
| static inline int |
| MozTaggedMemoryIsSupported(void) |
| { |
| return 0; |
| } |
| |
| #endif // ANDROID |
| |
| #endif // !XP_WIN |
| |
| #endif // mozilla_TaggedAnonymousMemory_h |