зеркало из https://github.com/mozilla/gecko-dev.git
92 строки
3.1 KiB
C
92 строки
3.1 KiB
C
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozmemory_h
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#define mozmemory_h
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/*
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* This header is meant to be used when the following functions are
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* necessary:
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* - malloc_good_size (used to be called je_malloc_usable_in_advance)
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* - jemalloc_stats
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* - jemalloc_purge_freed_pages
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* - jemalloc_free_dirty_pages
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*/
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#ifndef MOZ_MEMORY
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# error Should not include mozmemory.h when MOZ_MEMORY is not set
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#endif
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#include "mozmemory_wrap.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/Types.h"
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#include "jemalloc_types.h"
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MOZ_BEGIN_EXTERN_C
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/*
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* On OSX, malloc/malloc.h contains the declaration for malloc_good_size,
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* which will call back in jemalloc, through the zone allocator so just use it.
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*/
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#ifdef XP_DARWIN
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# include <malloc/malloc.h>
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#else
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MOZ_MEMORY_API size_t malloc_good_size_impl(size_t size);
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/* Note: the MOZ_GLUE_IN_PROGRAM ifdef below is there to avoid -Werror turning
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* the protective if into errors. MOZ_GLUE_IN_PROGRAM is what triggers MFBT_API
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* to use weak imports. */
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static MOZ_INLINE size_t _malloc_good_size(size_t size) {
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# if defined(MOZ_GLUE_IN_PROGRAM) && !defined(IMPL_MFBT)
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if (!malloc_good_size)
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return size;
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# endif
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return malloc_good_size_impl(size);
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}
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# define malloc_good_size _malloc_good_size
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#endif
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MOZ_JEMALLOC_API void jemalloc_stats(jemalloc_stats_t *stats);
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/*
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* On some operating systems (Mac), we use madvise(MADV_FREE) to hand pages
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* back to the operating system. On Mac, the operating system doesn't take
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* this memory back immediately; instead, the OS takes it back only when the
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* machine is running out of physical memory.
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*
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* This is great from the standpoint of efficiency, but it makes measuring our
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* actual RSS difficult, because pages which we've MADV_FREE'd shouldn't count
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* against our RSS.
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*
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* This function explicitly purges any MADV_FREE'd pages from physical memory,
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* causing our reported RSS match the amount of memory we're actually using.
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*
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* Note that this call is expensive in two ways. First, it may be slow to
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* execute, because it may make a number of slow syscalls to free memory. This
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* function holds the big jemalloc locks, so basically all threads are blocked
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* while this function runs.
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*
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* This function is also expensive in that the next time we go to access a page
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* which we've just explicitly decommitted, the operating system has to attach
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* to it a physical page! If we hadn't run this function, the OS would have
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* less work to do.
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*
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* If MALLOC_DOUBLE_PURGE is not defined, this function does nothing.
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*/
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MOZ_JEMALLOC_API void jemalloc_purge_freed_pages();
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/*
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* Free all unused dirty pages in all arenas. Calling this function will slow
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* down subsequent allocations so it is recommended to use it only when
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* memory needs to be reclaimed at all costs (see bug 805855). This function
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* provides functionality similar to mallctl("arenas.purge") in jemalloc 3.
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*/
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MOZ_JEMALLOC_API void jemalloc_free_dirty_pages();
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MOZ_END_EXTERN_C
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#endif /* mozmemory_h */
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