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Diffstat (limited to 'erts/emulator/sys/common/erl_mseg.c')
-rw-r--r--erts/emulator/sys/common/erl_mseg.c222
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 */