зеркало из https://github.com/mozilla/gecko-dev.git
79 строки
2.9 KiB
C
79 строки
2.9 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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// Some Linux kernels -- specifically, newer versions of Android and
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// some B2G devices -- have a feature for assigning names to ranges of
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// anonymous memory (i.e., memory that doesn't have a "name" in the
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// form of an underlying mapped file). These names are reported in
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// /proc/<pid>/smaps alongside system-level memory usage information
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// such as Proportional Set Size (memory usage adjusted for sharing
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// between processes), which allows reporting this information at a
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// finer granularity than would otherwise be possible (e.g.,
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// separating malloc() heap from JS heap).
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//
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// Existing memory can be tagged with MozTagAnonymousMemory(); it will
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// tag the range of complete pages containing the given interval, so
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// the results may be inexact if the range isn't page-aligned.
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// MozTaggedAnonymousMmap() can be used like mmap() with an extra
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// parameter, and will tag the returned memory if the mapping was
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// successful (and if it was in fact anonymous).
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//
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// NOTE: The pointer given as the "tag" argument MUST remain valid as
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// long as the mapping exists. The referenced string is read when
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// /proc/<pid>/smaps or /proc/<pid>/maps is read, not when the tag is
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// established, so freeing it or changing its contents will have
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// unexpected results. Using a static string is probably best.
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//
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// Also note that this header can be used by both C and C++ code.
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#ifndef mozilla_TaggedAnonymousMemory_h
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#define mozilla_TaggedAnonymousMemory_h
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#ifndef XP_WIN
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# include <sys/types.h>
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# include <sys/mman.h>
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# include "mozilla/Types.h"
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# ifdef ANDROID
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# ifdef __cplusplus
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extern "C" {
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# endif
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MFBT_API void MozTagAnonymousMemory(const void* aPtr, size_t aLength,
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const char* aTag);
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MFBT_API void* MozTaggedAnonymousMmap(void* aAddr, size_t aLength, int aProt,
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int aFlags, int aFd, off_t aOffset,
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const char* aTag);
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MFBT_API int MozTaggedMemoryIsSupported(void);
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# ifdef __cplusplus
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} // extern "C"
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# endif
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# else // ANDROID
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static inline void MozTagAnonymousMemory(const void* aPtr, size_t aLength,
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const char* aTag) {}
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static inline void* MozTaggedAnonymousMmap(void* aAddr, size_t aLength,
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int aProt, int aFlags, int aFd,
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off_t aOffset, const char* aTag) {
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return mmap(aAddr, aLength, aProt, aFlags, aFd, aOffset);
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}
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static inline int MozTaggedMemoryIsSupported(void) { return 0; }
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# endif // ANDROID
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#endif // !XP_WIN
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#endif // mozilla_TaggedAnonymousMemory_h
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