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-rw-r--r--erts/emulator/sys/common/erl_mseg.c876
1 files changed, 148 insertions, 728 deletions
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 2748edba02..94a381e168 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -100,45 +100,6 @@ static int atoms_initialized;
typedef struct mem_kind_t MemKind;
-#if HALFWORD_HEAP
-static int initialize_pmmap(void);
-static void *pmmap(size_t size);
-static int pmunmap(void *p, size_t size);
-static void *pmremap(void *old_address, size_t old_size,
- size_t new_size);
-#endif
-
-#if HAVE_MMAP
-/* Mmap ... */
-
-#define MMAP_PROT (PROT_READ|PROT_WRITE)
-
-
-#ifdef MAP_ANON
-# define MMAP_FLAGS (MAP_ANON|MAP_PRIVATE)
-# define MMAP_FD (-1)
-#else
-# define MMAP_FLAGS (MAP_PRIVATE)
-# define MMAP_FD mmap_fd
-static int mmap_fd;
-#endif
-
-#if HAVE_MREMAP
-# define HAVE_MSEG_RECREATE 1
-#else
-# define HAVE_MSEG_RECREATE 0
-#endif
-
-#if HALFWORD_HEAP
-#define CAN_PARTLY_DESTROY 0
-#else
-#define CAN_PARTLY_DESTROY 1
-#endif
-#else /* #if HAVE_MMAP */
-#define CAN_PARTLY_DESTROY 0
-#error "Not supported"
-#endif /* #if HAVE_MMAP */
-
const ErtsMsegOpt_t erts_mseg_default_opt = {
1, /* Use cache */
1, /* Preserv data */
@@ -163,9 +124,7 @@ typedef struct {
CallCounter create;
CallCounter create_resize;
CallCounter destroy;
-#if HAVE_MSEG_RECREATE
CallCounter recreate;
-#endif
CallCounter clear_cache;
CallCounter check_cache;
} ErtsMsegCalls;
@@ -173,7 +132,7 @@ typedef struct {
typedef struct cache_t_ cache_t;
struct cache_t_ {
- Uint size;
+ UWord size;
void *seg;
cache_t *next;
cache_t *prev;
@@ -236,11 +195,6 @@ struct ErtsMsegAllctr_t_ {
Uint rel_max_cache_bad_fit;
ErtsMsegCalls calls;
-
-#if CAN_PARTLY_DESTROY
- Uint min_seg_size;
-#endif
-
};
typedef union {
@@ -344,69 +298,31 @@ schedule_cache_check(ErtsMsegAllctr_t *ma) {
}
}
-/* remove ErtsMsegAllctr_t from arguments?
- * only used for statistics
- */
-static ERTS_INLINE void *
-mmap_align(ErtsMsegAllctr_t *ma, void *addr, size_t length, int prot, int flags, int fd, off_t offset) {
-
- char *p, *q;
- UWord d;
-
- p = mmap(addr, length, prot, flags, fd, offset);
-
- if (MAP_IS_ALIGNED(p) || p == MAP_FAILED)
- return p;
-
- if (ma)
- INC_CC(ma, create_resize);
-
- munmap(p, length);
-
- if ((p = mmap(addr, length + MSEG_ALIGNED_SIZE, prot, flags, fd, offset)) == MAP_FAILED)
- return MAP_FAILED;
-
- q = (void *)ALIGNED_CEILING((char *)p);
- d = (UWord)(q - p);
-
- if (d > 0)
- munmap(p, d);
-
- if (MSEG_ALIGNED_SIZE - d > 0)
- munmap((void *)(q + length), MSEG_ALIGNED_SIZE - d);
-
- return q;
-}
+/* #define ERTS_PRINT_ERTS_MMAP */
static ERTS_INLINE void *
-mseg_create(ErtsMsegAllctr_t *ma, MemKind* mk, Uint size)
+mseg_create(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, UWord *sizep)
{
+#ifdef ERTS_PRINT_ERTS_MMAP
+ UWord req_size = *sizep;
+#endif
void *seg;
- ASSERT(size % MSEG_ALIGNED_SIZE == 0);
-
+ Uint32 mmap_flags = 0;
#if HALFWORD_HEAP
- if (mk == &ma->low_mem) {
- seg = pmmap(size);
- if ((unsigned long) seg & CHECK_POINTER_MASK) {
- erts_fprintf(stderr,"Pointer mask failure (0x%08lx)\n",(unsigned long) seg);
- return NULL;
- }
- } else
+ mmap_flags |= ((mk == &ma->low_mem)
+ ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
+ : ERTS_MMAPFLG_OS_ONLY);
#endif
- {
-#if HAVE_MMAP
- {
- seg = (void *) mmap_align(ma, (void *) 0, (size_t) size,
- MMAP_PROT, MMAP_FLAGS, MMAP_FD, 0);
- if (seg == (void *) MAP_FAILED)
- seg = NULL;
-
- ASSERT(MAP_IS_ALIGNED(seg) || !seg);
- }
-#else
-# error "Missing mseg_create() implementation"
+ if (MSEG_FLG_IS_2POW(flags))
+ mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
+
+ seg = erts_mmap(mmap_flags, sizep);
+
+#ifdef ERTS_PRINT_ERTS_MMAP
+ erts_fprintf(stderr, "%p = erts_mmap(%s, {%bpu, %bpu});\n", seg,
+ (mmap_flags & ERTS_MMAPFLG_SUPERALIGNED) ? "sa" : "sua",
+ req_size, *sizep);
#endif
- }
INC_CC(ma, create);
@@ -414,91 +330,55 @@ mseg_create(ErtsMsegAllctr_t *ma, MemKind* mk, Uint size)
}
static ERTS_INLINE void
-mseg_destroy(ErtsMsegAllctr_t *ma, MemKind* mk, void *seg, Uint size) {
- ERTS_DECLARE_DUMMY(int res);
-
+mseg_destroy(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *seg_p, UWord size) {
+
+ Uint32 mmap_flags = 0;
#if HALFWORD_HEAP
- if (mk == &ma->low_mem) {
- res = pmunmap((void *) seg, size);
- }
- else
+ mmap_flags |= ((mk == &ma->low_mem)
+ ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
+ : ERTS_MMAPFLG_OS_ONLY);
#endif
- {
-#ifdef HAVE_MMAP
- res = munmap((void *) seg, size);
-#else
-# error "Missing mseg_destroy() implementation"
+ if (MSEG_FLG_IS_2POW(flags))
+ mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
+
+ erts_munmap(mmap_flags, seg_p, size);
+#ifdef ERTS_PRINT_ERTS_MMAP
+ erts_fprintf(stderr, "erts_munmap(%s, %p, %bpu);\n",
+ (mmap_flags & ERTS_MMAPFLG_SUPERALIGNED) ? "sa" : "sua",
+ seg_p, *size);
#endif
- }
-
- ASSERT(size % MSEG_ALIGNED_SIZE == 0);
- ASSERT(res == 0);
-
INC_CC(ma, destroy);
}
-#if HAVE_MSEG_RECREATE
-#if defined(__NetBSD__)
-#define MREMAP_FLAGS (0)
-#else
-#define MREMAP_FLAGS (MREMAP_MAYMOVE)
-#endif
-
-
-/* mseg_recreate
- * May return *unaligned* segments as in address not aligned to MSEG_ALIGNMENT
- * it is still page aligned
- *
- * This is fine for single block carriers as long as we don't cache misaligned
- * segments (since multiblock carriers may use them)
- *
- * For multiblock carriers we *need* MSEG_ALIGNMENT but mbc's will never be
- * reallocated.
- *
- * This should probably be fixed the following way:
- * 1) Use an option to segment allocation - NEED_ALIGNMENT
- * 2) Add mremap_align which takes care of aligning a new a mremaped area
- * 3) Fix the cache to handle of aligned and unaligned segments
- */
-
static ERTS_INLINE void *
-mseg_recreate(ErtsMsegAllctr_t *ma, MemKind* mk, void *old_seg, Uint old_size, Uint new_size)
+mseg_recreate(ErtsMsegAllctr_t *ma, Uint flags, MemKind* mk, void *old_seg, UWord old_size, UWord *sizep)
{
+#ifdef ERTS_PRINT_ERTS_MMAP
+ UWord req_size = *sizep;
+#endif
void *new_seg;
-
- ASSERT(old_size % MSEG_ALIGNED_SIZE == 0);
- ASSERT(new_size % MSEG_ALIGNED_SIZE == 0);
-
+ Uint32 mmap_flags = 0;
#if HALFWORD_HEAP
- if (mk == &ma->low_mem) {
- new_seg = (void *) pmremap((void *) old_seg,
- (size_t) old_size,
- (size_t) new_size);
- }
- else
+ mmap_flags |= ((mk == &ma->low_mem)
+ ? ERTS_MMAPFLG_SUPERCARRIER_ONLY
+ : ERTS_MMAPFLG_OS_ONLY);
#endif
- {
-#if HAVE_MREMAP
-#if defined(__NetBSD__)
- new_seg = mremap(old_seg, (size_t)old_size, NULL, new_size, MREMAP_FLAGS);
-#else
- new_seg = mremap(old_seg, (size_t)old_size, (size_t)new_size, MREMAP_FLAGS);
-#endif
- if (new_seg == (void *) MAP_FAILED)
- new_seg = NULL;
-#else
-#error "Missing mseg_recreate() implementation"
-#endif
- }
+ if (MSEG_FLG_IS_2POW(flags))
+ mmap_flags |= ERTS_MMAPFLG_SUPERALIGNED;
+ new_seg = erts_mremap(mmap_flags, old_seg, old_size, sizep);
+
+#ifdef ERTS_PRINT_ERTS_MMAP
+ erts_fprintf(stderr, "%p = erts_mremap(%s, %p, %bpu, {%bpu, %bpu});\n",
+ new_seg, (mmap_flags & ERTS_MMAPFLG_SUPERALIGNED) ? "sa" : "sua",
+ old_seg, old_size, req_size, *sizep);
+#endif
INC_CC(ma, recreate);
return new_seg;
}
-#endif /* #if HAVE_MSEG_RECREATE */
-
#ifdef DEBUG
#define ERTS_DBG_MA_CHK_THR_ACCESS(MA) \
do { \
@@ -528,7 +408,7 @@ static ERTS_INLINE void mseg_cache_clear_node(cache_t *c) {
c->prev = c;
}
-static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, Uint size, Uint flags) {
+static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, UWord size, Uint flags) {
cache_t *c;
ERTS_DBG_MK_CHK_THR_ACCESS(mk);
@@ -566,14 +446,13 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, Uint size, Ui
return 1;
} else if (!MSEG_FLG_IS_2POW(flags) && !erts_circleq_is_empty(&(mk->cache_unpowered_node))) {
-
/* No free slots.
* Evict oldest slot from unpowered cache so we can cache an unpowered (sbc) segment */
c = erts_circleq_tail(&(mk->cache_unpowered_node));
erts_circleq_remove(c);
- mseg_destroy(mk->ma, mk, c->seg, c->size);
+ mseg_destroy(mk->ma, ERTS_MSEG_FLG_NONE, mk, c->seg, c->size);
mseg_cache_clear_node(c);
c->seg = seg;
@@ -599,7 +478,8 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, Uint size, Ui
c = erts_circleq_tail(&(mk->cache_powered_node[i]));
erts_circleq_remove(c);
- mseg_destroy(mk->ma, mk, c->seg, c->size);
+ mseg_destroy(mk->ma, ERTS_MSEG_FLG_2POW, mk, c->seg, c->size);
+
mseg_cache_clear_node(c);
c->seg = seg;
@@ -614,18 +494,18 @@ static ERTS_INLINE int cache_bless_segment(MemKind *mk, void *seg, Uint size, Ui
return 0;
}
-static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint *size_p, Uint flags) {
+static ERTS_INLINE void *cache_get_segment(MemKind *mk, UWord *size_p, Uint flags) {
- Uint size = *size_p;
+ UWord size = *size_p;
ERTS_DBG_MK_CHK_THR_ACCESS(mk);
if (MSEG_FLG_IS_2POW(flags)) {
int i, ix = SIZE_TO_CACHE_AREA_IDX(size);
- void *seg;
+ char *seg;
cache_t *c;
- Uint csize;
+ UWord csize;
ASSERT(IS_2POW(size));
@@ -641,7 +521,7 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint *size_p, Uint flags
ASSERT(MAP_IS_ALIGNED(c->seg));
csize = c->size;
- seg = c->seg;
+ seg = (char*) c->seg;
mk->cache_size--;
mk->cache_hits++;
@@ -652,9 +532,8 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint *size_p, Uint flags
ASSERT(!(mk->cache_size < 0));
- if (csize != size) {
- mseg_destroy(mk->ma, mk, (char *)seg + size, csize - size);
- }
+ if (csize != size)
+ mseg_destroy(mk->ma, ERTS_MSEG_FLG_2POW, mk, seg + size, csize - size);
return seg;
}
@@ -663,10 +542,10 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint *size_p, Uint flags
void *seg;
cache_t *c;
cache_t *best = NULL;
- Uint bdiff = 0;
- Uint csize;
- Uint bad_max_abs = mk->ma->abs_max_cache_bad_fit;
- Uint bad_max_rel = mk->ma->rel_max_cache_bad_fit;
+ UWord bdiff = 0;
+ UWord csize;
+ UWord bad_max_abs = mk->ma->abs_max_cache_bad_fit;
+ UWord bad_max_rel = mk->ma->rel_max_cache_bad_fit;
erts_circleq_foreach(c, &(mk->cache_unpowered_node)) {
csize = c->size;
@@ -728,7 +607,7 @@ static ERTS_INLINE void *cache_get_segment(MemKind *mk, Uint *size_p, Uint flags
* using callbacks from aux-work in the scheduler.
*/
-static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, cache_t *head) {
+static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, Uint flags, cache_t *head) {
cache_t *c = NULL;
c = erts_circleq_tail(head);
@@ -737,7 +616,7 @@ static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, cache_t *h
if (erts_mtrace_enabled)
erts_mtrace_crr_free(SEGTYPE, SEGTYPE, c->seg);
- mseg_destroy(mk->ma, mk, c->seg, c->size);
+ mseg_destroy(mk->ma, flags, mk, c->seg, c->size);
mseg_cache_clear_node(c);
erts_circleq_push_head(&(mk->cache_free), c);
@@ -749,7 +628,7 @@ static ERTS_INLINE Uint mseg_drop_one_memkind_cache_size(MemKind *mk, cache_t *h
return mk->cache_size;
}
-static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, cache_t *head) {
+static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, Uint flags, cache_t *head) {
cache_t *c = NULL;
while (!erts_circleq_is_empty(head)) {
@@ -760,7 +639,7 @@ static ERTS_INLINE Uint mseg_drop_memkind_cache_size(MemKind *mk, cache_t *head)
if (erts_mtrace_enabled)
erts_mtrace_crr_free(SEGTYPE, SEGTYPE, c->seg);
- mseg_destroy(mk->ma, mk, c->seg, c->size);
+ mseg_destroy(mk->ma, flags, mk, c->seg, c->size);
mseg_cache_clear_node(c);
erts_circleq_push_head(&(mk->cache_free), c);
@@ -788,11 +667,11 @@ static Uint mseg_check_memkind_cache(MemKind *mk) {
for (i = 0; i < CACHE_AREAS; i++) {
if (!erts_circleq_is_empty(&(mk->cache_powered_node[i])))
- return mseg_drop_one_memkind_cache_size(mk, &(mk->cache_powered_node[i]));
+ return mseg_drop_one_memkind_cache_size(mk, ERTS_MSEG_FLG_2POW, &(mk->cache_powered_node[i]));
}
if (!erts_circleq_is_empty(&(mk->cache_unpowered_node)))
- return mseg_drop_one_memkind_cache_size(mk, &(mk->cache_unpowered_node));
+ return mseg_drop_one_memkind_cache_size(mk, ERTS_MSEG_FLG_NONE, &(mk->cache_unpowered_node));
return 0;
}
@@ -851,12 +730,12 @@ static void mseg_clear_memkind_cache(MemKind *mk) {
if (erts_circleq_is_empty(&(mk->cache_powered_node[i])))
continue;
- mseg_drop_memkind_cache_size(mk, &(mk->cache_powered_node[i]));
+ mseg_drop_memkind_cache_size(mk, ERTS_MSEG_FLG_2POW, &(mk->cache_powered_node[i]));
ASSERT(erts_circleq_is_empty(&(mk->cache_powered_node[i])));
}
/* drop varied caches */
if (!erts_circleq_is_empty(&(mk->cache_unpowered_node)))
- mseg_drop_memkind_cache_size(mk, &(mk->cache_unpowered_node));
+ mseg_drop_memkind_cache_size(mk, ERTS_MSEG_FLG_NONE, &(mk->cache_unpowered_node));
ASSERT(erts_circleq_is_empty(&(mk->cache_unpowered_node)));
ASSERT(mk->cache_size == 0);
@@ -896,36 +775,35 @@ static ERTS_INLINE MemKind* memkind(ErtsMsegAllctr_t *ma,
}
static void *
-mseg_alloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, Uint *size_p,
+mseg_alloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, UWord *size_p,
Uint flags, const ErtsMsegOpt_t *opt)
{
- Uint size;
+ UWord size;
void *seg;
MemKind* mk = memkind(ma, opt);
INC_CC(ma, alloc);
- /* Carrier align */
- size = ALIGNED_CEILING(*size_p);
-
- /* Cache optim (if applicable) */
- if (MSEG_FLG_IS_2POW(flags) && !IS_2POW(size))
- size = ceil_2pow(size);
+ if (!MSEG_FLG_IS_2POW(flags))
+ size = ERTS_PAGEALIGNED_CEILING(*size_p);
+ else {
+ size = ALIGNED_CEILING(*size_p);
+ if (!IS_2POW(size)) {
+ /* Cache optim (if applicable) */
+ size = ceil_2pow(size);
+ }
+ }
-#if CAN_PARTLY_DESTROY
- if (size < ma->min_seg_size)
- ma->min_seg_size = size;
-#endif
-
if (opt->cache && mk->cache_size > 0 && (seg = cache_get_segment(mk, &size, flags)) != NULL)
goto done;
- if ((seg = mseg_create(ma, mk, size)) == NULL)
- size = 0;
+ seg = mseg_create(ma, flags, mk, &size);
+ if (!seg)
+ *size_p = 0;
+ else {
done:
- *size_p = size;
- if (seg) {
+ *size_p = size;
if (erts_mtrace_enabled)
erts_mtrace_crr_alloc(seg, atype, ERTS_MTRACE_SEGMENT_ID, size);
@@ -937,7 +815,7 @@ done:
static void
-mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, Uint size,
+mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, UWord size,
Uint flags, const ErtsMsegOpt_t *opt)
{
MemKind* mk = memkind(ma, opt);
@@ -952,7 +830,7 @@ mseg_dealloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg, Uint size,
if (erts_mtrace_enabled)
erts_mtrace_crr_free(atype, SEGTYPE, seg);
- mseg_destroy(ma, mk, seg, size);
+ mseg_destroy(ma, flags, mk, seg, size);
done:
@@ -961,11 +839,11 @@ done:
static void *
mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
- Uint old_size, Uint *new_size_p, Uint flags, const ErtsMsegOpt_t *opt)
+ UWord old_size, UWord *new_size_p, Uint flags, const ErtsMsegOpt_t *opt)
{
MemKind* mk;
void *new_seg;
- Uint new_size;
+ UWord new_size;
/* Just allocate a new segment if we didn't have one before */
if (!seg || !old_size) {
@@ -985,90 +863,47 @@ mseg_realloc(ErtsMsegAllctr_t *ma, ErtsAlcType_t atype, void *seg,
mk = memkind(ma, opt);
new_seg = seg;
- /* Carrier align */
- new_size = ALIGNED_CEILING(*new_size_p);
-
- /* Cache optim (if applicable) */
- if (MSEG_FLG_IS_2POW(flags) && !IS_2POW(new_size))
- new_size = ceil_2pow(new_size);
-
- if (new_size == old_size)
- ;
- else if (new_size < old_size) {
- Uint shrink_sz = old_size - new_size;
+ if (!MSEG_FLG_IS_2POW(flags))
+ new_size = ERTS_PAGEALIGNED_CEILING(*new_size_p);
+ else {
+ new_size = ALIGNED_CEILING(*new_size_p);
+ if (!IS_2POW(new_size)) {
+ /* Cache optim (if applicable) */
+ new_size = ceil_2pow(new_size);
+ }
+ }
-#if CAN_PARTLY_DESTROY
- if (new_size < ma->min_seg_size)
- ma->min_seg_size = new_size;
-#endif
- /* +M<S>rsbcst <ratio> */
- if (shrink_sz < opt->abs_shrink_th
- && 100*shrink_sz < opt->rel_shrink_th*old_size) {
- new_size = old_size;
+ if (new_size > old_size) {
+ if (opt->preserv) {
+ new_seg = mseg_recreate(ma, flags, mk, (void *) seg, old_size, &new_size);
+ if (!new_seg)
+ new_size = old_size;
}
else {
-
-#if CAN_PARTLY_DESTROY
-
- if (erts_mtrace_enabled)
- erts_mtrace_crr_realloc(new_seg, atype, SEGTYPE, seg, new_size);
-
- mseg_destroy(ma, mk, ((char *) seg) + new_size, shrink_sz);
-
-#elif HAVE_MSEG_RECREATE
- goto do_recreate;
-#else
+ mseg_dealloc(ma, atype, seg, old_size, flags, opt);
new_seg = mseg_alloc(ma, atype, &new_size, flags, opt);
-
- ASSERT(MAP_IS_ALIGNED(new_seg) || !new_seg);
-
if (!new_seg)
- new_size = old_size;
- else {
- sys_memcpy(((char *) new_seg),
- ((char *) seg),
- MIN(new_size, old_size));
- mseg_dealloc(ma, atype, seg, old_size, flags, opt);
- }
-#endif
+ new_size = 0;
}
}
- else {
+ else if (new_size < old_size) {
+ UWord shrink_sz = old_size - new_size;
- if (!opt->preserv) {
- mseg_dealloc(ma, atype, seg, old_size, flags, opt);
- new_seg = mseg_alloc(ma, atype, &new_size, flags, opt);
- ASSERT(MAP_IS_ALIGNED(new_seg) || !new_seg);
+ /* +M<S>rsbcst <ratio> */
+ if (shrink_sz < opt->abs_shrink_th
+ && 100*shrink_sz < opt->rel_shrink_th*old_size) {
+ new_size = old_size;
}
else {
-#if HAVE_MSEG_RECREATE
-#if !CAN_PARTLY_DESTROY
- do_recreate:
-#endif
- new_seg = mseg_recreate(ma, mk, (void *) seg, old_size, new_size);
- /* ASSERT(MAP_IS_ALIGNED(new_seg) || !new_seg);
- * will not always be aligned and it ok for now
- */
-
- if (erts_mtrace_enabled)
- erts_mtrace_crr_realloc(new_seg, atype, SEGTYPE, seg, new_size);
+ new_seg = mseg_recreate(ma, flags, mk, (void *) seg, old_size, &new_size);
if (!new_seg)
new_size = old_size;
-#else
- new_seg = mseg_alloc(ma, atype, &new_size, flags, opt);
-
- ASSERT(MAP_IS_ALIGNED(new_seg) || !new_seg);
-
- if (!new_seg)
- new_size = old_size;
- else {
- sys_memcpy(((char *) new_seg), ((char *) seg), MIN(new_size, old_size));
- mseg_dealloc(ma, atype, seg, old_size, flags, opt);
- }
-#endif
}
}
+ if (erts_mtrace_enabled)
+ erts_mtrace_crr_realloc(new_seg, atype, SEGTYPE, seg, new_size);
+
INC_CC(ma, realloc);
ASSERT(!MSEG_FLG_IS_2POW(flags) || IS_2POW(new_size));
@@ -1106,9 +941,7 @@ static struct {
Eterm mseg_create;
Eterm mseg_create_resize;
Eterm mseg_destroy;
-#if HAVE_MSEG_RECREATE
Eterm mseg_recreate;
-#endif
Eterm mseg_clear_cache;
Eterm mseg_check_cache;
@@ -1129,8 +962,6 @@ init_atoms(ErtsMsegAllctr_t *ma)
#ifdef DEBUG
Eterm *atom;
#endif
-
- ERTS_MSEG_UNLOCK(ma);
erts_mtx_lock(&init_atoms_mutex);
if (!atoms_initialized) {
@@ -1163,9 +994,7 @@ init_atoms(ErtsMsegAllctr_t *ma)
AM_INIT(mseg_create);
AM_INIT(mseg_create_resize);
AM_INIT(mseg_destroy);
-#if HAVE_MSEG_RECREATE
AM_INIT(mseg_recreate);
-#endif
AM_INIT(mseg_clear_cache);
AM_INIT(mseg_check_cache);
@@ -1176,7 +1005,6 @@ init_atoms(ErtsMsegAllctr_t *ma)
#endif
}
- ERTS_MSEG_LOCK(ma);
atoms_initialized = 1;
erts_mtx_unlock(&init_atoms_mutex);
}
@@ -1239,7 +1067,9 @@ info_options(ErtsMsegAllctr_t *ma,
Uint **hpp,
Uint *szp)
{
- Eterm res = THE_NON_VALUE;
+ Eterm res;
+
+ res = erts_mmap_info_options(prefix, print_to_p, print_to_arg, hpp, szp);
if (print_to_p) {
int to = *print_to_p;
@@ -1254,7 +1084,6 @@ info_options(ErtsMsegAllctr_t *ma,
if (!atoms_initialized)
init_atoms(ma);
- res = NIL;
add_2tup(hpp, szp, &res,
am.mcs,
bld_uint(hpp, szp, ma->max_cache_size));
@@ -1293,9 +1122,7 @@ info_calls(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp
PRINT_CC(to, arg, create);
PRINT_CC(to, arg, create_resize);
PRINT_CC(to, arg, destroy);
-#if HAVE_MSEG_RECREATE
PRINT_CC(to, arg, recreate);
-#endif
PRINT_CC(to, arg, clear_cache);
PRINT_CC(to, arg, check_cache);
@@ -1316,12 +1143,10 @@ info_calls(ErtsMsegAllctr_t *ma, int *print_to_p, void *print_to_arg, Uint **hpp
bld_unstable_uint(hpp, szp, ma->calls.clear_cache.giga_no),
bld_unstable_uint(hpp, szp, ma->calls.clear_cache.no));
-#if HAVE_MSEG_RECREATE
add_3tup(hpp, szp, &res,
am.mseg_recreate,
bld_unstable_uint(hpp, szp, ma->calls.recreate.giga_no),
bld_unstable_uint(hpp, szp, ma->calls.recreate.no));
-#endif
add_3tup(hpp, szp, &res,
am.mseg_destroy,
bld_unstable_uint(hpp, szp, ma->calls.destroy.giga_no),
@@ -1465,14 +1290,8 @@ erts_mseg_info_options(int ix,
ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_IX(ix);
Eterm res;
- ERTS_MSEG_LOCK(ma);
-
- ERTS_DBG_MA_CHK_THR_ACCESS(ma);
-
res = info_options(ma, "option ", print_to_p, print_to_arg, hpp, szp);
- ERTS_MSEG_UNLOCK(ma);
-
return res;
}
@@ -1490,10 +1309,6 @@ erts_mseg_info(int ix,
Eterm values[4];
Uint n = 0;
- ERTS_MSEG_LOCK(ma);
-
- ERTS_DBG_MA_CHK_THR_ACCESS(ma);
-
if (hpp || szp) {
if (!atoms_initialized)
@@ -1506,6 +1321,10 @@ erts_mseg_info(int ix,
}
values[n++] = info_version(ma, print_to_p, print_to_arg, hpp, szp);
values[n++] = info_options(ma, "option ", print_to_p, print_to_arg, hpp, szp);
+
+ ERTS_MSEG_LOCK(ma);
+ ERTS_DBG_MA_CHK_THR_ACCESS(ma);
+
#if HALFWORD_HEAP
values[n++] = info_memkind(ma, &ma->low_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
values[n++] = info_memkind(ma, &ma->hi_mem, print_to_p, print_to_arg, begin_max_per, hpp, szp);
@@ -1521,7 +1340,7 @@ erts_mseg_info(int ix,
}
void *
-erts_mseg_alloc_opt(ErtsAlcType_t atype, Uint *size_p, Uint flags, const ErtsMsegOpt_t *opt)
+erts_mseg_alloc_opt(ErtsAlcType_t atype, UWord *size_p, Uint flags, const ErtsMsegOpt_t *opt)
{
ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt);
void *seg;
@@ -1529,20 +1348,23 @@ erts_mseg_alloc_opt(ErtsAlcType_t atype, Uint *size_p, Uint flags, const ErtsMse
ERTS_DBG_MA_CHK_THR_ACCESS(ma);
seg = mseg_alloc(ma, atype, size_p, flags, opt);
ERTS_MSEG_UNLOCK(ma);
+ HARD_DBG_INSERT_MSEG(seg, *size_p);
return seg;
}
void *
-erts_mseg_alloc(ErtsAlcType_t atype, Uint *size_p, Uint flags)
+erts_mseg_alloc(ErtsAlcType_t atype, UWord *size_p, Uint flags)
{
return erts_mseg_alloc_opt(atype, size_p, flags, &erts_mseg_default_opt);
}
void
erts_mseg_dealloc_opt(ErtsAlcType_t atype, void *seg,
- Uint size, Uint flags, const ErtsMsegOpt_t *opt)
+ UWord size, Uint flags, const ErtsMsegOpt_t *opt)
{
ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt);
+
+ HARD_DBG_REMOVE_MSEG(seg, size);
ERTS_MSEG_LOCK(ma);
ERTS_DBG_MA_CHK_THR_ACCESS(ma);
mseg_dealloc(ma, atype, seg, size, flags, opt);
@@ -1550,29 +1372,32 @@ erts_mseg_dealloc_opt(ErtsAlcType_t atype, void *seg,
}
void
-erts_mseg_dealloc(ErtsAlcType_t atype, void *seg, Uint size, Uint flags)
+erts_mseg_dealloc(ErtsAlcType_t atype, void *seg, UWord size, Uint flags)
{
erts_mseg_dealloc_opt(atype, seg, size, flags, &erts_mseg_default_opt);
}
void *
erts_mseg_realloc_opt(ErtsAlcType_t atype, void *seg,
- Uint old_size, Uint *new_size_p,
+ UWord old_size, UWord *new_size_p,
Uint flags,
const ErtsMsegOpt_t *opt)
{
ErtsMsegAllctr_t *ma = ERTS_MSEG_ALLCTR_OPT(opt);
void *new_seg;
+
+ HARD_DBG_REMOVE_MSEG(seg, old_size);
ERTS_MSEG_LOCK(ma);
ERTS_DBG_MA_CHK_THR_ACCESS(ma);
new_seg = mseg_realloc(ma, atype, seg, old_size, new_size_p, flags, opt);
ERTS_MSEG_UNLOCK(ma);
+ HARD_DBG_INSERT_MSEG(new_seg, *new_size_p);
return new_seg;
}
void *
erts_mseg_realloc(ErtsAlcType_t atype, void *seg,
- Uint old_size, Uint *new_size_p, Uint flags)
+ UWord old_size, UWord *new_size_p, Uint flags)
{
return erts_mseg_realloc_opt(atype, seg, old_size, new_size_p,
flags, &erts_mseg_default_opt);
@@ -1662,16 +1487,17 @@ erts_mseg_init(ErtsMsegInit_t *init)
erts_mtx_init(&init_atoms_mutex, "mseg_init_atoms");
-#if HAVE_MMAP && !defined(MAP_ANON)
- mmap_fd = open("/dev/zero", O_RDWR);
- if (mmap_fd < 0)
- erl_exit(ERTS_ABORT_EXIT, "erts_mseg: unable to open /dev/zero\n");
-#endif
+#if HALFWORD_HEAP
+ if (sizeof(void *) != 8)
+ erl_exit(-1,"Halfword emulator cannot be run in 32bit mode");
-#if HAVE_MMAP && HALFWORD_HEAP
- initialize_pmmap();
+ init->mmap.virtual_range.start = (char *) sbrk(0);
+ init->mmap.virtual_range.end = (char *) 0x100000000UL;
+ init->mmap.sco = 0;
#endif
+ erts_mmap_init(&init->mmap);
+
if (!IS_2POW(GET_PAGE_SIZE))
erl_exit(ERTS_ABORT_EXIT, "erts_mseg: Unexpected page_size %beu\n", GET_PAGE_SIZE);
@@ -1712,10 +1538,6 @@ erts_mseg_init(ErtsMsegInit_t *init)
#endif
sys_memzero((void *) &ma->calls, sizeof(ErtsMsegCalls));
-
-#if CAN_PARTLY_DESTROY
- ma->min_seg_size = ~((Uint) 0);
-#endif
}
}
@@ -1757,7 +1579,7 @@ erts_mseg_test(UWord op, UWord a1, UWord a2, UWord a3)
case 0x400: /* Have erts_mseg */
return (UWord) 1;
case 0x401:
- return (UWord) erts_mseg_alloc(ERTS_ALC_A_INVALID, (Uint *) a1, (Uint) 0);
+ return (UWord) erts_mseg_alloc(ERTS_ALC_A_INVALID, (UWord *) a1, (Uint) 0);
case 0x402:
erts_mseg_dealloc(ERTS_ALC_A_INVALID, (void *) a1, (Uint) a2, (Uint) 0);
return (UWord) 0;
@@ -1765,7 +1587,7 @@ erts_mseg_test(UWord op, UWord a1, UWord a2, UWord a3)
return (UWord) erts_mseg_realloc(ERTS_ALC_A_INVALID,
(void *) a1,
(Uint) a2,
- (Uint *) a3,
+ (UWord *) a3,
(Uint) 0);
case 0x404:
erts_mseg_clear_cache();
@@ -1788,405 +1610,3 @@ erts_mseg_test(UWord op, UWord a1, UWord a2, UWord a3)
}
}
-
-
-#if HALFWORD_HEAP
-/*
- * Very simple page oriented mmap replacer. Works in the lower
- * 32 bit address range of a 64bit program.
- * Implements anonymous mmap mremap and munmap with address order first fit.
- * The free list is expected to be very short...
- * To be used for compressed pointers in Erlang halfword emulator
- * implementation. The MacOS X version is more of a toy, it's not really
- * for production as the halfword erlang VM relies on Linux specific memory
- * mapping tricks.
- */
-
-/* #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
-#endif
-
-#define INIT_LOCK() do {erts_mtx_init(&pmmap_mutex, "pmmap");} while(0)
-
-#define TAKE_LOCK() do {erts_mtx_lock(&pmmap_mutex);} while(0)
-
-#define RELEASE_LOCK() do {erts_mtx_unlock(&pmmap_mutex);} while(0)
-
-static erts_mtx_t pmmap_mutex; /* Also needed when !USE_THREADS */
-
-typedef struct _free_block {
- unsigned long num; /*pages*/
- struct _free_block *next;
-} FreeBlock;
-
-/* Protect with lock */
-static FreeBlock *first;
-
-static void *do_map(void *ptr, size_t sz)
-{
- void *res;
-
- if (ALIGNED_CEILING(sz) != sz) {
- HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz);
- return NULL;
- }
-
- if (((unsigned long) ptr) % MSEG_ALIGNED_SIZE) {
- HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz);
- return NULL;
- }
-
-#if HAVE_MMAP
- res = mmap(ptr, sz,
- PROT_READ | PROT_WRITE, MAP_PRIVATE |
- MAP_ANONYMOUS | MAP_FIXED,
- -1 , 0);
-#else
-# error "Missing mmap support"
-#endif
-
- if (res == MAP_FAILED) {
- HARDDEBUG_MAP_FAILED(ptr, sz);
- return NULL;
- }
-
- return res;
-}
-
-static int do_unmap(void *ptr, size_t sz)
-{
- void *res;
-
- if (ALIGNED_CEILING(sz) != sz) {
- HARDDEBUG_HW_INCOMPLETE_ALIGNMENT(ptr, sz);
- return 1;
- }
-
- if (((unsigned long) ptr) % MSEG_ALIGNED_SIZE) {
- HARDDEBUG_HW_UNALIGNED_ALIGNMENT(ptr, sz);
- return 1;
- }
-
- res = mmap(ptr, sz,
- PROT_NONE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE | MAP_FIXED,
- -1 , 0);
-
- if (res == MAP_FAILED) {
- HARDDEBUG_MAP_FAILED(ptr, sz);
- return 1;
- }
-
- return 0;
-}
-
-#ifdef __APPLE__
-/*
- * The first 4 gig's are protected on Macos X for 64bit processes :(
- * The range 0x1000000000 - 0x10FFFFFFFF is selected as an arbitrary
- * value of a normally unused range... Real MMAP's will avoid
- * it and all 32bit compressed pointers can be in that range...
- * More expensive than on Linux where expansion of compressed
- * poiters involves no masking (as they are in the first 4 gig's).
- * It's also very uncertain if the MAP_NORESERVE flag really has
- * any effect in MacOS X. Swap space may always be allocated...
- */
-#define SET_RANGE_MIN() /* nothing */
-#define RANGE_MIN 0x1000000000UL
-#define RANGE_MAX 0x1100000000UL
-#define RANGE_MASK (RANGE_MIN)
-#define EXTRA_MAP_FLAGS (MAP_FIXED)
-#else
-static size_t range_min;
-#define SET_RANGE_MIN() do { range_min = (size_t) sbrk(0); } while (0)
-#define RANGE_MIN range_min
-#define RANGE_MAX 0x100000000UL
-#define RANGE_MASK 0UL
-#define EXTRA_MAP_FLAGS (0)
-#endif
-
-static int initialize_pmmap(void)
-{
- char *p,*q,*rptr;
- size_t rsz;
- FreeBlock *initial;
-
- SET_RANGE_MIN();
- if (sizeof(void *) != 8) {
- erl_exit(1,"Halfword emulator cannot be run in 32bit mode");
- }
-
- p = (char *) RANGE_MIN;
- q = (char *) RANGE_MAX;
-
- rsz = ALIGNED_FLOOR(q - p);
-
- rptr = mmap_align(NULL, (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 / MSEG_ALIGNED_SIZE),
- (void *) rptr, (void*)(rptr + rsz));
-#endif
- if ((UWord)(rptr + rsz) > RANGE_MAX) {
- size_t rsz_trunc = RANGE_MAX - (UWord)rptr;
-#ifdef HARDDEBUG
- printf("Reducing mmap'ed memory from %lu to %lu Mb, reduced range = %p -> %p\r\n",
- rsz/(1024*1024), rsz_trunc/(1024*1024), rptr, rptr+rsz_trunc);
-#endif
- munmap((void*)RANGE_MAX, rsz - rsz_trunc);
- rsz = rsz_trunc;
- }
- if (!do_map(rptr, MSEG_ALIGNED_SIZE)) {
- erl_exit(1,"Could not actually mmap first page for halfword emulator...\n");
- }
- initial = (FreeBlock *) rptr;
- initial->num = (rsz / MSEG_ALIGNED_SIZE);
- initial->next = NULL;
- first = initial;
- INIT_LOCK();
- return 0;
-}
-
-static void *pmmap(size_t size)
-{
- size_t real_size = ALIGNED_CEILING(size);
- size_t num_pages = real_size / MSEG_ALIGNED_SIZE;
- FreeBlock **block;
- FreeBlock *tail;
- FreeBlock *res;
-
- TAKE_LOCK();
-
- for (block = &first;
- *block != NULL && (*block)->num < num_pages;
- block = &((*block)->next))
- ;
- if (!(*block)) {
- RELEASE_LOCK();
- return NULL;
- }
- if ((*block)->num == num_pages) {
- /* nice, perfect fit */
- res = *block;
- *block = (*block)->next;
- } else {
- tail = (FreeBlock *) (((char *) ((void *) (*block))) + real_size);
- if (!do_map(tail, MSEG_ALIGNED_SIZE)) {
- HARDDEBUG_MAP_FAILED(tail, MSEG_ALIGNED_SIZE);
- RELEASE_LOCK();
- return NULL;
- }
- tail->num = (*block)->num - num_pages;
- tail->next = (*block)->next;
- res = *block;
- *block = tail;
- }
-
- RELEASE_LOCK();
-
- if (!do_map(res, real_size)) {
- HARDDEBUG_MAP_FAILED(res, real_size);
- return NULL;
- }
-
- return (void *) res;
-}
-
-static int pmunmap(void *p, size_t size)
-{
- size_t real_size = ALIGNED_CEILING(size);
- size_t num_pages = real_size / MSEG_ALIGNED_SIZE;
-
- FreeBlock *block;
- FreeBlock *last;
- FreeBlock *nb = (FreeBlock *) p;
-
- ASSERT(((unsigned long)p & CHECK_POINTER_MASK)==0);
-
- if (real_size > MSEG_ALIGNED_SIZE) {
- if (do_unmap(((char *) p) + MSEG_ALIGNED_SIZE, real_size - MSEG_ALIGNED_SIZE)) {
- return 1;
- }
- }
-
- TAKE_LOCK();
-
- last = NULL;
- block = first;
- while(block != NULL && ((void *) block) < p) {
- last = block;
- block = block->next;
- }
-
- if (block != NULL &&
- ((void *) block) == ((void *) (((char *) p) + real_size))) {
- /* Merge new free block with following */
- nb->num = block->num + num_pages;
- nb->next = block->next;
- if (do_unmap(block, MSEG_ALIGNED_SIZE)) {
- RELEASE_LOCK();
- return 1;
- }
- } else {
- /* just link in */
- nb->num = num_pages;
- nb->next = block;
- }
- if (last != NULL) {
- if (p == ((void *) (((char *) last) + (last->num * MSEG_ALIGNED_SIZE)))) {
- /* Merge with previous */
- last->num += nb->num;
- last->next = nb->next;
- if (do_unmap(nb, MSEG_ALIGNED_SIZE)) {
- RELEASE_LOCK();
- return 1;
- }
- } else {
- last->next = nb;
- }
- } else {
- first = nb;
- }
- RELEASE_LOCK();
- return 0;
-}
-
-static void *pmremap(void *old_address, size_t old_size,
- size_t new_size)
-{
- size_t new_real_size = ALIGNED_CEILING(new_size);
- size_t new_num_pages = new_real_size / MSEG_ALIGNED_SIZE;
- size_t old_real_size = ALIGNED_CEILING(old_size);
- size_t old_num_pages = old_real_size / MSEG_ALIGNED_SIZE;
- if (new_num_pages == old_num_pages) {
- return old_address;
- } else if (new_num_pages < old_num_pages) { /* Shrink */
- size_t nfb_pages = old_num_pages - new_num_pages;
- size_t nfb_real_size = old_real_size - new_real_size;
- void *vnfb = (void *) (((char *)old_address) + new_real_size);
- FreeBlock *nfb = (FreeBlock *) vnfb;
- FreeBlock **block;
- TAKE_LOCK();
- for (block = &first;
- *block != NULL && (*block) < nfb;
- block = &((*block)->next))
- ;
- if (!(*block) ||
- (*block) > ((FreeBlock *)(((char *) vnfb) + nfb_real_size))) {
- /* Normal link in */
- if (nfb_pages > 1) {
- if (do_unmap((void *)(((char *) vnfb) + MSEG_ALIGNED_SIZE),
- (nfb_pages - 1)*MSEG_ALIGNED_SIZE)) {
- return NULL;
- }
- }
- nfb->next = (*block);
- nfb->num = nfb_pages;
- (*block) = nfb;
- } else { /* block merge */
- nfb->next = (*block)->next;
- nfb->num = nfb_pages + (*block)->num;
- /* unmap also the first page of the next freeblock */
- (*block) = nfb;
- if (do_unmap((void *)(((char *) vnfb) + MSEG_ALIGNED_SIZE),
- nfb_pages*MSEG_ALIGNED_SIZE)) {
- return NULL;
- }
- }
- RELEASE_LOCK();
- return old_address;
- } else { /* Enlarge */
- FreeBlock **block;
- void *old_end = (void *) (((char *)old_address) + old_real_size);
- TAKE_LOCK();
- for (block = &first;
- *block != NULL && (*block) < (FreeBlock *) old_address;
- block = &((*block)->next))
- ;
- if ((*block) == NULL || old_end > ((void *) RANGE_MAX) ||
- (*block) != old_end ||
- (*block)->num < (new_num_pages - old_num_pages)) {
- /* cannot extend */
- void *result;
- RELEASE_LOCK();
- result = pmmap(new_size);
- if (result == NULL) {
- return NULL;
- }
- memcpy(result,old_address,old_size);
- if (pmunmap(old_address,old_size)) {
- /* Oups... */
- pmunmap(result,new_size);
- return NULL;
- }
- return result;
- } else { /* extend */
- size_t remaining_pages = (*block)->num -
- (new_num_pages - old_num_pages);
- if (!remaining_pages) {
- void *p = (void *) (((char *) (*block)) + MSEG_ALIGNED_SIZE);
- void *n = (*block)->next;
- size_t x = ((*block)->num - 1) * MSEG_ALIGNED_SIZE;
- if (x > 0) {
- if (do_map(p,x) == NULL) {
- RELEASE_LOCK();
- return NULL;
- }
- }
- (*block) = n;
- } else {
- FreeBlock *nfb = (FreeBlock *) ((void *)
- (((char *) old_address) +
- new_real_size));
- void *p = (void *) (((char *) (*block)) + MSEG_ALIGNED_SIZE);
- if (do_map(p,new_real_size - old_real_size) == NULL) {
- RELEASE_LOCK();
- return NULL;
- }
- nfb->num = remaining_pages;
- nfb->next = (*block)->next;
- (*block) = nfb;
- }
- RELEASE_LOCK();
- return old_address;
- }
- }
-}
-#endif /* HALFWORD_HEAP */