diff options
Diffstat (limited to 'erts/emulator/sys')
-rw-r--r-- | erts/emulator/sys/common/erl_mseg.c | 222 |
1 files changed, 92 insertions, 130 deletions
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c index e77287f2ef..612b98cb12 100644 --- a/erts/emulator/sys/common/erl_mseg.c +++ b/erts/emulator/sys/common/erl_mseg.c @@ -78,7 +78,7 @@ #define ALIGNED_MASK (~INV_ALIGNED_MASK) #define ALIGNED_FLOOR(X) (((Uint)(X)) & ALIGNED_MASK) #define ALIGNED_CEILING(X) ALIGNED_FLOOR((X) + INV_ALIGNED_MASK) -#define MAP_IS_ALIGNED(X) ((((Uint)X) & (ALIGNED_SIZE - 1)) == 0) +#define MAP_IS_ALIGNED(X) ((((unsigned long)X) & (ALIGNED_SIZE - 1)) == 0) static int atoms_initialized; @@ -335,7 +335,7 @@ static ERTS_INLINE void * mmap_align(void *addr, size_t length, int prot, int flags, int fd, off_t offset) { void *seg, *aseg; - Uint diff; + unsigned long diff; seg = mmap(addr, length, prot, flags, fd, offset); @@ -345,13 +345,12 @@ mmap_align(void *addr, size_t length, int prot, int flags, int fd, off_t offset) munmap(seg, length); - seg = mmap(addr, length + ALIGNED_SIZE, prot, flags, fd, offset); - if (seg == MAP_FAILED) { + if ((seg = mmap(addr, length + ALIGNED_SIZE, prot, flags, fd, offset)) == MAP_FAILED) { return seg; } /* ceil to aligned pointer */ - aseg = (void *)(((Uint)(seg + ALIGNED_SIZE)) & (~(ALIGNED_SIZE - 1))); + aseg = (void *)(((unsigned long)(seg + ALIGNED_SIZE)) & (~(ALIGNED_SIZE - 1))); diff = aseg - seg; if (diff > 0) { @@ -401,25 +400,17 @@ mseg_create(ErtsMsegAllctr_t *ma, MemKind* mk, Uint size) static ERTS_INLINE void mseg_destroy(ErtsMsegAllctr_t *ma, MemKind* mk, void *seg, Uint size) { -#ifdef DEBUG - int res; -#endif + ERTS_DECLARE_DUMMY(int res); #if HALFWORD_HEAP if (mk == &ma->low_mem) { -#ifdef DEBUG - res = -#endif - pmunmap((void *) seg, size); + res = pmunmap((void *) seg, size); } else #endif { #ifdef HAVE_MMAP -#ifdef DEBUG - res = -#endif - munmap((void *) seg, size); + res = munmap((void *) seg, size); #else # error "Missing mseg_destroy() implementation" #endif @@ -439,8 +430,8 @@ mseg_recreate(ErtsMsegAllctr_t *ma, MemKind* mk, void *old_seg, Uint old_size, U { void *new_seg; - ASSERT(old_size % page_size == 0); - ASSERT(new_size % page_size == 0); + ASSERT(old_size % ALIGNED_SIZE == 0); + ASSERT(new_size % ALIGNED_SIZE == 0); #if HALFWORD_HEAP if (mk == &ma->low_mem) { @@ -1594,7 +1585,7 @@ erts_mseg_init(ErtsMsegInit_t *init) #endif page_size = GET_PAGE_SIZE; - ASSERT( (ALIGNED_SIZE % page_size) == 0); + ASSERT((ALIGNED_SIZE % page_size) == 0); page_shift = 1; /* page size alignment assertion */ @@ -1732,7 +1723,40 @@ erts_mseg_test(unsigned long op, * mapping tricks. */ -/*#define HARDDEBUG 1*/ +/* #define HARDDEBUG 1 */ + +#ifdef HARDDEBUG +static void dump_freelist(void) +{ + FreeBlock *p = first; + + while (p) { + fprintf(stderr, "p = %p\r\np->num = %ld\r\np->next = %p\r\n\r\n", + (void *) p, (unsigned long) p->num, (void *) p->next); + p = p->next; + } +} + +#define HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(PTR, SZ) \ + fprintf(stderr,"Mapping of address %p with size %ld " \ + "does not map complete pages (%s:%d)\r\n", \ + (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) + +#define HARDDEBUG_HW_UNALIGNED_ALIGNMENT(PTR, SZ) \ + fprintf(stderr,"Mapping of address %p with size %ld " \ + "is not page aligned (%s:%d)\r\n", \ + (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) + +#define HARDDEBUG_MAP_FAILED(PTR, SZ) \ + fprintf(stderr, "Could not actually map memory " \ + "at address %p with size %ld (%s:%d) ..\r\n", \ + (void *) (PTR), (unsigned long) (SZ),__FILE__, __LINE__) +#else +#define HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(PTR, SZ) do{}while(0) +#define HARDDEBUG_HW_UNALIGNED_ALIGNMENT(PTR, SZ) do{}while(0) +#define HARDDEBUG_MAP_FAILED(PTR, SZ) do{}while(0) +#endif + #ifdef __APPLE__ #define MAP_ANONYMOUS MAP_ANON @@ -1751,49 +1775,20 @@ typedef struct _free_block { struct _free_block *next; } FreeBlock; -/* Assigned once and for all */ -static size_t pagsz; - /* Protect with lock */ static FreeBlock *first; -static size_t round_up_to_pagesize(size_t size) -{ - size_t x = size / pagsz; - - if ((size % pagsz)) { - ++x; - } - - return pagsz * x; -} - -static size_t round_down_to_pagesize(size_t size) -{ - size_t x = size / pagsz; - - return pagsz * x; -} - static void *do_map(void *ptr, size_t sz) { void *res; - if (round_up_to_pagesize(sz) != sz) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld " - "does not map complete pages\r\n", - (void *) ptr, (unsigned long) sz); -#endif + if (ALIGNED_CEILING(sz) != sz) { + HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz); return NULL; } - if (((unsigned long) ptr) % pagsz) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld " - "is not page aligned\r\n", - (void *) ptr, (unsigned long) sz); -#endif + if (((unsigned long) ptr) % ALIGNED_SIZE) { + HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz); return NULL; } @@ -1807,10 +1802,7 @@ static void *do_map(void *ptr, size_t sz) #endif if (res == MAP_FAILED) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld failed!\r\n", - (void *) ptr, (unsigned long) sz); -#endif + HARDDEBUG_MAP_FAILED(ptr, sz); return NULL; } @@ -1821,35 +1813,22 @@ static int do_unmap(void *ptr, size_t sz) { void *res; - if (round_up_to_pagesize(sz) != sz) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld " - "does not map complete pages\r\n", - (void *) ptr, (unsigned long) sz); -#endif + if (ALIGNED_CEILING(sz) != sz) { + HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz); return 1; } - if (((unsigned long) ptr) % pagsz) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld " - "is not page aligned\r\n", - (void *) ptr, (unsigned long) sz); -#endif + if (((unsigned long) ptr) % ALIGNED_SIZE) { + HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz); return 1; } - res = mmap(ptr, sz, - PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE - | MAP_FIXED, + PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED, -1 , 0); if (res == MAP_FAILED) { -#ifdef HARDDEBUG - fprintf(stderr,"Mapping of address %p with size %ld failed!\r\n", - (void *) ptr, (unsigned long) sz); -#endif + HARDDEBUG_MAP_FAILED(ptr, sz); return 1; } @@ -1887,8 +1866,6 @@ static int initialize_pmmap(void) size_t rsz; FreeBlock *initial; - - pagsz = getpagesize(); SET_RANGE_MIN(); if (sizeof(void *) != 8) { erl_exit(1,"Halfword emulator cannot be run in 32bit mode"); @@ -1897,15 +1874,15 @@ static int initialize_pmmap(void) p = (char *) RANGE_MIN; q = (char *) RANGE_MAX; - rsz = round_down_to_pagesize(q - p); + rsz = ALIGNED_FLOOR(q - p); - rptr = mmap((void *) p, rsz, + rptr = mmap_align((void *) p, rsz, PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | EXTRA_MAP_FLAGS, -1 , 0); #ifdef HARDDEBUG printf("p=%p, rsz = %ld, pages = %ld, got range = %p -> %p\r\n", - p, (unsigned long) rsz, (unsigned long) (rsz / pagsz), + p, (unsigned long) rsz, (unsigned long) (rsz / ALIGNED_SIZE), (void *) rptr, (void*)(rptr + rsz)); #endif if ((UWord)(rptr + rsz) > RANGE_MAX) { @@ -1917,39 +1894,27 @@ static int initialize_pmmap(void) munmap((void*)RANGE_MAX, rsz - rsz_trunc); rsz = rsz_trunc; } - if (!do_map(rptr,pagsz)) { + if (!do_map(rptr, ALIGNED_SIZE)) { erl_exit(1,"Could not actually mmap first page for halfword emulator...\n"); } initial = (FreeBlock *) rptr; - initial->num = (rsz / pagsz); + initial->num = (rsz / ALIGNED_SIZE); initial->next = NULL; first = initial; INIT_LOCK(); return 0; } -#ifdef HARDDEBUG -static void dump_freelist(void) -{ - FreeBlock *p = first; - - while (p) { - printf("p = %p\r\np->num = %ld\r\np->next = %p\r\n\r\n", - (void *) p, (unsigned long) p->num, (void *) p->next); - p = p->next; - } -} -#endif - - static void *pmmap(size_t size) { - size_t real_size = round_up_to_pagesize(size); - size_t num_pages = real_size / pagsz; + size_t real_size = ALIGNED_CEILING(size); + size_t num_pages = real_size / ALIGNED_SIZE; FreeBlock **block; FreeBlock *tail; FreeBlock *res; + TAKE_LOCK(); + for (block = &first; *block != NULL && (*block)->num < num_pages; block = &((*block)->next)) @@ -1960,29 +1925,25 @@ static void *pmmap(size_t size) } if ((*block)->num == num_pages) { /* nice, perfect fit */ - res = *block; + res = *block; *block = (*block)->next; } else { tail = (FreeBlock *) (((char *) ((void *) (*block))) + real_size); - if (!do_map(tail,pagsz)) { -#ifdef HARDDEBUG - fprintf(stderr, "Could not actually allocate page at %p...\r\n", - (void *) tail); -#endif + if (!do_map(tail, ALIGNED_SIZE)) { + HARDDEBUG_MAP_FAILED(tail, ALIGNED_SIZE); RELEASE_LOCK(); return NULL; } - tail->num = (*block)->num - num_pages; + tail->num = (*block)->num - num_pages; tail->next = (*block)->next; res = *block; *block = tail; } + RELEASE_LOCK(); - if (!do_map(res,real_size)) { -#ifdef HARDDEBUG - fprintf(stderr, "Could not actually allocate %ld at %p...\r\n", - (unsigned long) real_size, (void *) res); -#endif + + if (!do_map(res, real_size)) { + HARDDEBUG_MAP_FAILED(res, real_size); return NULL; } @@ -1991,15 +1952,17 @@ static void *pmmap(size_t size) static int pmunmap(void *p, size_t size) { - size_t real_size = round_up_to_pagesize(size); - size_t num_pages = real_size / pagsz; + size_t real_size = ALIGNED_CEILING(size); + size_t num_pages = real_size / ALIGNED_SIZE; + FreeBlock *block; FreeBlock *last; FreeBlock *nb = (FreeBlock *) p; ASSERT(((unsigned long)p & CHECK_POINTER_MASK)==0); - if (real_size > pagsz) { - if (do_unmap(((char *) p) + pagsz,real_size - pagsz)) { + + if (real_size > ALIGNED_SIZE) { + if (do_unmap(((char *) p) + ALIGNED_SIZE, real_size - ALIGNED_SIZE)) { return 1; } } @@ -2018,7 +1981,7 @@ static int pmunmap(void *p, size_t size) /* Merge new free block with following */ nb->num = block->num + num_pages; nb->next = block->next; - if (do_unmap(block,pagsz)) { + if (do_unmap(block, ALIGNED_SIZE)) { RELEASE_LOCK(); return 1; } @@ -2028,11 +1991,11 @@ static int pmunmap(void *p, size_t size) nb->next = block; } if (last != NULL) { - if (p == ((void *) (((char *) last) + (last->num * pagsz)))) { + if (p == ((void *) (((char *) last) + (last->num * ALIGNED_SIZE)))) { /* Merge with previous */ last->num += nb->num; last->next = nb->next; - if (do_unmap(nb,pagsz)) { + if (do_unmap(nb, ALIGNED_SIZE)) { RELEASE_LOCK(); return 1; } @@ -2049,10 +2012,10 @@ static int pmunmap(void *p, size_t size) static void *pmremap(void *old_address, size_t old_size, size_t new_size) { - size_t new_real_size = round_up_to_pagesize(new_size); - size_t new_num_pages = new_real_size / pagsz; - size_t old_real_size = round_up_to_pagesize(old_size); - size_t old_num_pages = old_real_size / pagsz; + size_t new_real_size = ALIGNED_CEILING(new_size); + size_t new_num_pages = new_real_size / ALIGNED_SIZE; + size_t old_real_size = ALIGNED_CEILING(old_size); + size_t old_num_pages = old_real_size / ALIGNED_SIZE; if (new_num_pages == old_num_pages) { return old_address; } else if (new_num_pages < old_num_pages) { /* Shrink */ @@ -2070,8 +2033,8 @@ static void *pmremap(void *old_address, size_t old_size, (*block) > ((FreeBlock *)(((char *) vnfb) + nfb_real_size))) { /* Normal link in */ if (nfb_pages > 1) { - if (do_unmap((void *)(((char *) vnfb) + pagsz), - (nfb_pages - 1)*pagsz)) { + if (do_unmap((void *)(((char *) vnfb) + ALIGNED_SIZE), + (nfb_pages - 1)*ALIGNED_SIZE)) { return NULL; } } @@ -2083,8 +2046,8 @@ static void *pmremap(void *old_address, size_t old_size, nfb->num = nfb_pages + (*block)->num; /* unmap also the first page of the next freeblock */ (*block) = nfb; - if (do_unmap((void *)(((char *) vnfb) + pagsz), - nfb_pages*pagsz)) { + if (do_unmap((void *)(((char *) vnfb) + ALIGNED_SIZE), + nfb_pages*ALIGNED_SIZE)) { return NULL; } } @@ -2119,9 +2082,9 @@ static void *pmremap(void *old_address, size_t old_size, size_t remaining_pages = (*block)->num - (new_num_pages - old_num_pages); if (!remaining_pages) { - void *p = (void *) (((char *) (*block)) + pagsz); + void *p = (void *) (((char *) (*block)) + ALIGNED_SIZE); void *n = (*block)->next; - size_t x = ((*block)->num - 1) * pagsz; + size_t x = ((*block)->num - 1) * ALIGNED_SIZE; if (x > 0) { if (do_map(p,x) == NULL) { RELEASE_LOCK(); @@ -2133,7 +2096,7 @@ static void *pmremap(void *old_address, size_t old_size, FreeBlock *nfb = (FreeBlock *) ((void *) (((char *) old_address) + new_real_size)); - void *p = (void *) (((char *) (*block)) + pagsz); + void *p = (void *) (((char *) (*block)) + ALIGNED_SIZE); if (do_map(p,new_real_size - old_real_size) == NULL) { RELEASE_LOCK(); return NULL; @@ -2147,5 +2110,4 @@ static void *pmremap(void *old_address, size_t old_size, } } } - #endif /* HALFWORD_HEAP */ |