зеркало из https://github.com/mozilla/pjs.git
bug=396007 r=brendan a1.9b4=mtschrep Prefering posix_memalign over mmap to allocate GC arenas.
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igor@mir2.org
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291
js/src/jsgc.c
291
js/src/jsgc.c
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@ -79,34 +79,52 @@
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#endif
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/*
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* Deduce if mmap or similar is available.
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* Check if posix_memalign is available.
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*/
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#ifndef JS_GC_USE_MMAP
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#if _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || MOZ_MEMORY
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# define HAS_POSIX_MEMALIGN 1
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#else
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# define HAS_POSIX_MEMALIGN 0
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#endif
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/*
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* jemalloc provides posix_memalign but the function has to be explicitly
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* declared on Windows.
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*/
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#if HAS_POSIX_MEMALIGN && MOZ_MEMORY_WINDOWS
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extern int
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posix_memalign(void **memptr, size_t alignment, size_t size);
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#endif
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/*
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* Include the headers for mmap unless we have posix_memalign and do not
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* insist on mmap.
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*/
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#if JS_GC_USE_MMAP || (!defined JS_GC_USE_MMAP && !HAS_POSIX_MEMALIGN)
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# if defined(XP_WIN)
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# define JS_GC_USE_MMAP 1
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# elif defined(XP_UNIX) || defined(XP_BEOS)
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# include <unistd.h>
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# if defined(_POSIX_MAPPED_FILES) && _POSIX_MAPPED_FILES > 0
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# ifndef JS_GC_USE_MMAP
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# define JS_GC_USE_MMAP 1
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# endif
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# endif
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#endif
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#ifndef JS_GC_USE_MMAP
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# define JS_GC_USE_MMAP 0
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#endif
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#if JS_GC_USE_MMAP
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# if defined(XP_WIN)
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# include <windows.h>
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# elif defined(XP_UNIX) || defined(XP_BEOS)
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# include <sys/mman.h>
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# else
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# if defined(XP_UNIX) || defined(XP_BEOS)
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# include <unistd.h>
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# endif
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# if _POSIX_MAPPED_FILES > 0
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# ifndef JS_GC_USE_MMAP
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# define JS_GC_USE_MMAP 1
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# endif
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# include <sys/mman.h>
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/* On Mac OS X MAP_ANONYMOUS is not defined. */
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# if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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# define MAP_ANONYMOUS MAP_ANON
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# if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
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# define MAP_ANONYMOUS MAP_ANON
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# endif
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# else
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# if JS_GC_USE_MMAP
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# error "JS_GC_USE_MMAP is set when mmap is not available"
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# endif
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# endif
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# endif
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#endif
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@ -159,35 +177,66 @@
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* marking phase of the GC. The locking is implemented via a hash table. Thus
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* for doubles the flag area becomes a bitmap.
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*
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* JS_GC_USE_MMAP macros governs the allocation of aligned arenas. When the
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* macro is true, a platform specific allocation code like POSIX mmap is used
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* with no extra overhead. If the macro is false, the code uses malloc to
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* allocate a chunk of
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* JS_GC_USE_MMAP macro governs the choice of the aligned arena allocator.
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* When it is is true, a platform-dependant function like mmap is used to get
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* memory aligned on CPU page boundaries. If the macro is false or undefined,
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* posix_memalign is used when available. Otherwise the code uses malloc to
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* over-allocate a chunk with js_gcArenasPerChunk aligned arenas. The
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* approximate space overhead of this is 1/js_gcArenasPerChunk. For details,
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* see NewGCChunk/DestroyGCChunk below.
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*
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* GC_ARENA_SIZE * (js_gcArenasPerChunk + 1)
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*
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* bytes. The chunk contains at least js_gcArenasPerChunk aligned arenas so
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* the overhead of this schema is approximately 1/js_gcArenasPerChunk. See
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* NewGCChunk/DestroyGCChunk below for details.
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*
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* Note that even when JS_GC_USE_MMAP is true the code still allocates arenas
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* in chunks to minimize the overhead of mmap/munmap.
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*/
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/*
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* When mmap is available, use the minimal known CPU page size as the size of
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* GC arena. Otherwise use 1K arenas to minimize the overhead of the aligned
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* allocation.
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* The code also allocates arenas in chunks when JS_GC_USE_MMAP is 1 to
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* minimize the overhead of mmap/munmap. In this case js_gcArenasPerChunk can
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* not be a compile-time constant as the system page size is not known until
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* runtime.
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*/
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#if JS_GC_USE_MMAP
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# define GC_ARENA_SHIFT 12
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static uint32 js_gcArenasPerChunk = 0;
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static JSBool js_gcUseMmap = JS_FALSE;
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#elif HAS_POSIX_MEMALIGN
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# define js_gcArenasPerChunk 1
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#else
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# define GC_ARENA_SHIFT 10
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# define js_gcArenasPerChunk 7
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#endif
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#if defined(js_gcArenasPerChunk) && js_gcArenasPerChunk == 1
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# define CHUNKED_ARENA_ALLOCATION 0
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#else
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# define CHUNKED_ARENA_ALLOCATION 1
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#endif
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#define GC_ARENA_SHIFT 12
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#define GC_ARENA_MASK ((jsuword) JS_BITMASK(GC_ARENA_SHIFT))
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#define GC_ARENA_SIZE JS_BIT(GC_ARENA_SHIFT)
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/*
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* JS_GC_ARENA_PAD defines the number of bytes to pad JSGCArenaInfo structure.
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* It is used to improve allocation efficiency when using posix_memalign. If
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* malloc's implementation uses internal headers, then calling
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*
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* posix_memalign(&p, GC_ARENA_SIZE, GC_ARENA_SIZE * js_gcArenasPerChunk)
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*
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* in a sequence leaves holes between allocations of the size GC_ARENA_SIZE
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* due to the need to fit headers. JS_GC_ARENA_PAD mitigates that so the code
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* calls
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*
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* posix_memalign(&p, GC_ARENA_SIZE,
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* GC_ARENA_SIZE * js_gcArenasPerChunk - JS_GC_ARENA_PAD)
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*
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* When JS_GC_ARENA_PAD is equal or greater than the number of words in the
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* system header, the system can pack all allocations together without holes.
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*
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* With JS_GC_USE_MEMALIGN we want at least 2 word pad unless posix_memalign
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* comes from jemalloc that does not use any headers/trailers.
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*/
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#ifndef JS_GC_ARENA_PAD
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# if HAS_POSIX_MEMALIGN && !MOZ_MEMORY
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# define JS_GC_ARENA_PAD (2 * JS_BYTES_PER_WORD)
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# else
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# define JS_GC_ARENA_PAD 0
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# endif
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#endif
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struct JSGCArenaInfo {
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/*
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* Allocation list for the arena or NULL if the arena holds double values.
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@ -202,6 +251,9 @@ struct JSGCArenaInfo {
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*/
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JSGCArenaInfo *prev;
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#if !CHUNKED_ARENA_ALLOCATION
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jsuword prevUntracedPage;
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#else
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/*
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* A link field for the list of arenas with marked but not yet traced
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* things. The field is encoded as arena's page to share the space with
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@ -221,12 +273,17 @@ struct JSGCArenaInfo {
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/* Flag indicating if the arena is the first in the chunk. */
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jsuword firstArena : 1;
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#endif
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union {
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jsuword untracedThings; /* bitset for fast search of marked
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but not yet traced things */
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JSBool hasMarkedDoubles; /* the arena has marked doubles */
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} u;
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#if JS_GC_ARENA_PAD != 0
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uint8 pad[JS_GC_ARENA_PAD];
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#endif
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};
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/*
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@ -235,39 +292,7 @@ struct JSGCArenaInfo {
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* platform this does not compile, then, as a workaround, comment the assert
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* out and submit a bug report.
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*/
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JS_STATIC_ASSERT(sizeof(JSGCArenaInfo) == 4 * sizeof(jsuword));
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#define NO_FREE_ARENAS JS_BITMASK(GC_ARENA_SHIFT - 1)
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/*
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* All chunks that have at least one free arena are put on the doubly-linked
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* list with the head stored in JSRuntime.gcChunkList. JSGCChunkInfo contains
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* the head of the chunk's free arena list together with the link fields for
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* gcChunkList.
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*
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* The structure is stored in one of chunk's free arenas. GET_CHUNK_INFO_INDEX
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* macro gives the index of this arena. When all arenas in the chunk are used,
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* it is removed from the list and the index is set to NO_FREE_ARENAS
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* indicating that the chunk is not on gcChunkList and has no JSGCChunkInfo
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* available.
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*/
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struct JSGCChunkInfo {
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JSGCChunkInfo **prevp;
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JSGCChunkInfo *next;
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JSGCArenaInfo *lastFreeArena;
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uint32 numFreeArenas;
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};
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/*
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* Even when mmap is available, its overhead may be too big so the final
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* decision to use it is done at runtime.
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*/
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#if JS_GC_USE_MMAP
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static uint32 js_gcArenasPerChunk = 0;
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static JSBool js_gcUseMmap = JS_FALSE;
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#else
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# define js_gcArenasPerChunk 31
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#endif
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JS_STATIC_ASSERT(offsetof(JSGCArenaInfo, u) == 3 * sizeof(jsuword));
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/*
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* Macros to convert between JSGCArenaInfo, the start address of the arena and
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@ -299,9 +324,35 @@ static JSBool js_gcUseMmap = JS_FALSE;
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(JS_ASSERT((index) < js_gcArenasPerChunk), \
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ARENA_START_TO_INFO(chunk + ((index) << GC_ARENA_SHIFT)))
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#if CHUNKED_ARENA_ALLOCATION
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/*
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* Macros to access/modify information about the chunk of GC arenas.
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* Definitions for allocating arenas in chunks.
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*
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* All chunks that have at least one free arena are put on the doubly-linked
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* list with the head stored in JSRuntime.gcChunkList. JSGCChunkInfo contains
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* the head of the chunk's free arena list together with the link fields for
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* gcChunkList.
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*
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* Structure stored in one of chunk's free arenas. GET_CHUNK_INFO_INDEX gives
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* the index of this arena. When all arenas in the chunk are used, it is
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* removed from the list and the index is set to NO_FREE_ARENAS indicating
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* that the chunk is not on gcChunkList and has no JSGCChunkInfo available.
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*/
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struct JSGCChunkInfo {
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JSGCChunkInfo **prevp;
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JSGCChunkInfo *next;
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JSGCArenaInfo *lastFreeArena;
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uint32 numFreeArenas;
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};
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#define NO_FREE_ARENAS JS_BITMASK(GC_ARENA_SHIFT - 1)
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#ifdef js_gcArenasPerChunk
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JS_STATIC_ASSERT(1 <= js_gcArenasPerChunk &&
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js_gcArenasPerChunk <= NO_FREE_ARENAS);
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#endif
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#define GET_ARENA_CHUNK(arena, index) \
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(JS_ASSERT(GET_ARENA_INDEX(arena) == index), \
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ARENA_INFO_TO_START(arena) - ((index) << GC_ARENA_SHIFT))
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@ -324,6 +375,8 @@ static JSBool js_gcUseMmap = JS_FALSE;
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#define CHUNK_INFO_TO_INDEX(ci) \
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GET_ARENA_INDEX(ARENA_START_TO_INFO((jsuword)ci))
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#endif
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/*
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* Macros for GC-thing operations.
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*/
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@ -698,6 +751,8 @@ ShrinkPtrTable(JSPtrTable *table, const JSPtrTableInfo *info,
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#define METER_UPDATE_MAX(maxLval, rval) \
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METER_IF((maxLval) < (rval), (maxLval) = (rval))
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#if JS_GC_USE_MMAP || !HAS_POSIX_MEMALIGN
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/*
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* For chunks allocated via over-sized malloc, get a pointer to store the gap
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* between the malloc's result and the first arena in the chunk.
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@ -711,11 +766,12 @@ GetMallocedChunkGapPtr(jsuword chunk)
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return (uint32 *) (chunk + (js_gcArenasPerChunk << GC_ARENA_SHIFT));
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}
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#endif
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static jsuword
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NewGCChunk()
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NewGCChunk(void)
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{
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void *p;
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jsuword chunk;
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#if JS_GC_USE_MMAP
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if (js_gcUseMmap) {
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@ -723,35 +779,50 @@ NewGCChunk()
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p = VirtualAlloc(NULL, js_gcArenasPerChunk << GC_ARENA_SHIFT,
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MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
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return (jsuword) p;
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# elif defined(XP_UNIX) || defined(XP_BEOS)
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# else
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p = mmap(NULL, js_gcArenasPerChunk << GC_ARENA_SHIFT,
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PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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return (p == MAP_FAILED) ? 0 : (jsuword) p;
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# else
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# error "Not implemented"
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# endif
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}
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#endif
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#if HAS_POSIX_MEMALIGN
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if (0 != posix_memalign(&p, GC_ARENA_SIZE,
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GC_ARENA_SIZE * js_gcArenasPerChunk -
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JS_GC_ARENA_PAD)) {
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return 0;
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}
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return (jsuword) p;
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#else
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/*
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* Implement the chunk allocation using over sized malloc if mmap cannot
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* be used. FIXME bug 396007: the code should use posix_memalign when it
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* is available.
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* Implement chunk allocation using oversized malloc if mmap and
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* posix_memalign are not available.
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*
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* Since malloc allocates pointers aligned on the word boundary, to get
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* js_gcArenasPerChunk aligned arenas, we need to malloc only
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*
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* ((js_gcArenasPerChunk + 1) << GC_ARENA_SHIFT) - sizeof(size_t)
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*
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* bytes. But since we stores the gap between the malloced pointer and the
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* first arena in the chunk after the chunk, we need to ask for
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*
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* ((js_gcArenasPerChunk + 1) << GC_ARENA_SHIFT)
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*
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* bytes to ensure that we always have room to store the gap.
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*/
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p = malloc((js_gcArenasPerChunk + 1) << GC_ARENA_SHIFT);
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if (!p)
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return 0;
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chunk = ((jsuword) p + GC_ARENA_MASK) & ~GC_ARENA_MASK;
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*GetMallocedChunkGapPtr(chunk) = (uint32) (chunk - (jsuword) p);
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return chunk;
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{
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jsuword chunk;
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chunk = ((jsuword) p + GC_ARENA_MASK) & ~GC_ARENA_MASK;
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*GetMallocedChunkGapPtr(chunk) = (uint32) (chunk - (jsuword) p);
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return chunk;
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}
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#endif
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}
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static void
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@ -762,20 +833,24 @@ DestroyGCChunk(jsuword chunk)
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if (js_gcUseMmap) {
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# if defined(XP_WIN)
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VirtualFree((void *) chunk, 0, MEM_RELEASE);
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# elif defined(XP_UNIX) || defined(XP_BEOS)
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munmap((void *) chunk, js_gcArenasPerChunk << GC_ARENA_SHIFT);
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# else
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# error "Not implemented"
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munmap((void *) chunk, js_gcArenasPerChunk << GC_ARENA_SHIFT);
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# endif
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return;
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}
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#endif
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#if HAS_POSIX_MEMALIGN
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free((void *) chunk);
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#else
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/* See comments in NewGCChunk. */
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JS_ASSERT(*GetMallocedChunkGapPtr(chunk) < GC_ARENA_SIZE);
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free((void *) (chunk - *GetMallocedChunkGapPtr(chunk)));
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#endif
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}
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#if CHUNKED_ARENA_ALLOCATION
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static void
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AddChunkToList(JSRuntime *rt, JSGCChunkInfo *ci)
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{
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||||
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@ -798,23 +873,30 @@ RemoveChunkFromList(JSRuntime *rt, JSGCChunkInfo *ci)
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}
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}
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||||
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||||
#endif
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static JSGCArenaInfo *
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NewGCArena(JSRuntime *rt)
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{
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jsuword chunk;
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JSGCChunkInfo *ci;
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uint32 i;
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||||
JSGCArenaInfo *a, *aprev;
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JSGCArenaInfo *a;
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if (rt->gcBytes >= rt->gcMaxBytes)
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return NULL;
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#if CHUNKED_ARENA_ALLOCATION
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||||
if (js_gcArenasPerChunk == 1) {
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#endif
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chunk = NewGCChunk();
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||||
if (chunk == 0)
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return NULL;
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a = ARENA_START_TO_INFO(chunk);
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||||
#if CHUNKED_ARENA_ALLOCATION
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} else {
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||||
JSGCChunkInfo *ci;
|
||||
uint32 i;
|
||||
JSGCArenaInfo *aprev;
|
||||
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||||
ci = rt->gcChunkList;
|
||||
if (!ci) {
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chunk = NewGCChunk();
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||||
|
|
@ -856,6 +938,7 @@ NewGCArena(JSRuntime *rt)
|
|||
}
|
||||
}
|
||||
}
|
||||
#endif
|
||||
|
||||
rt->gcBytes += GC_ARENA_SIZE;
|
||||
a->prevUntracedPage = 0;
|
||||
|
|
@ -868,10 +951,6 @@ static void
|
|||
DestroyGCArenas(JSRuntime *rt, JSGCArenaInfo *last)
|
||||
{
|
||||
JSGCArenaInfo *a;
|
||||
uint32 arenaIndex;
|
||||
jsuword chunk;
|
||||
uint32 chunkInfoIndex;
|
||||
JSGCChunkInfo *ci;
|
||||
|
||||
while (last) {
|
||||
a = last;
|
||||
|
|
@ -881,19 +960,26 @@ DestroyGCArenas(JSRuntime *rt, JSGCArenaInfo *last)
|
|||
JS_ASSERT(rt->gcBytes >= GC_ARENA_SIZE);
|
||||
rt->gcBytes -= GC_ARENA_SIZE;
|
||||
|
||||
#if CHUNKED_ARENA_ALLOCATION
|
||||
if (js_gcArenasPerChunk == 1) {
|
||||
#endif
|
||||
DestroyGCChunk(ARENA_INFO_TO_START(a));
|
||||
#if CHUNKED_ARENA_ALLOCATION
|
||||
} else {
|
||||
#ifdef DEBUG
|
||||
uint32 arenaIndex;
|
||||
jsuword chunk;
|
||||
uint32 chunkInfoIndex;
|
||||
JSGCChunkInfo *ci;
|
||||
# ifdef DEBUG
|
||||
jsuword firstArena;
|
||||
|
||||
firstArena = a->firstArena;
|
||||
arenaIndex = a->arenaIndex;
|
||||
memset((void *) ARENA_INFO_TO_START(a), JS_FREE_PATTERN,
|
||||
GC_ARENA_SIZE);
|
||||
GC_ARENA_SIZE - JS_GC_ARENA_PAD);
|
||||
a->firstArena = firstArena;
|
||||
a->arenaIndex = arenaIndex;
|
||||
#endif
|
||||
# endif
|
||||
arenaIndex = GET_ARENA_INDEX(a);
|
||||
chunk = GET_ARENA_CHUNK(a, arenaIndex);
|
||||
chunkInfoIndex = GET_CHUNK_INFO_INDEX(chunk);
|
||||
|
|
@ -921,6 +1007,7 @@ DestroyGCArenas(JSRuntime *rt, JSGCArenaInfo *last)
|
|||
}
|
||||
}
|
||||
}
|
||||
# endif
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -1075,14 +1162,18 @@ typedef struct JSGCRootHashEntry {
|
|||
/* Initial size of the gcRootsHash table (SWAG, small enough to amortize). */
|
||||
#define GC_ROOTS_SIZE 256
|
||||
|
||||
#if CHUNKED_ARENA_ALLOCATION
|
||||
|
||||
/*
|
||||
* For a CPU with extremely large pages using them for GC things wastes
|
||||
* too much memory.
|
||||
*/
|
||||
#define GC_ARENAS_PER_CPU_PAGE_LIMIT JS_BIT(18 - GC_ARENA_SHIFT)
|
||||
# define GC_ARENAS_PER_CPU_PAGE_LIMIT JS_BIT(18 - GC_ARENA_SHIFT)
|
||||
|
||||
JS_STATIC_ASSERT(GC_ARENAS_PER_CPU_PAGE_LIMIT <= NO_FREE_ARENAS);
|
||||
|
||||
#endif
|
||||
|
||||
JSBool
|
||||
js_InitGC(JSRuntime *rt, uint32 maxbytes)
|
||||
{
|
||||
|
|
@ -1123,9 +1214,9 @@ js_InitGC(JSRuntime *rt, uint32 maxbytes)
|
|||
js_gcArenasPerChunk = 7;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
JS_ASSERT(1 <= js_gcArenasPerChunk &&
|
||||
js_gcArenasPerChunk <= NO_FREE_ARENAS);
|
||||
#endif
|
||||
|
||||
InitGCArenaLists(rt);
|
||||
if (!JS_DHashTableInit(&rt->gcRootsHash, JS_DHashGetStubOps(), NULL,
|
||||
|
|
|
|||
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