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-rw-r--r--erts/emulator/sys/common/erl_mseg.c66
1 files changed, 43 insertions, 23 deletions
diff --git a/erts/emulator/sys/common/erl_mseg.c b/erts/emulator/sys/common/erl_mseg.c
index 8421eb415c..ceb290b644 100644
--- a/erts/emulator/sys/common/erl_mseg.c
+++ b/erts/emulator/sys/common/erl_mseg.c
@@ -125,6 +125,9 @@ static int mmap_fd;
#error "Not supported"
#endif /* #if HAVE_MMAP */
+#if defined(ERTS_MSEG_FAKE_SEGMENTS) && HALFWORD_HEAP
+# warning "ERTS_MSEG_FAKE_SEGMENTS will only be used for high memory segments"
+#endif
#if defined(ERTS_MSEG_FAKE_SEGMENTS)
#undef CAN_PARTLY_DESTROY
@@ -334,9 +337,6 @@ mseg_create(MemKind* mk, Uint size)
ASSERT(size % page_size == 0);
-#if defined(ERTS_MSEG_FAKE_SEGMENTS)
- seg = erts_sys_alloc(ERTS_ALC_N_INVALID, NULL, size);
-#elif HAVE_MMAP
#if HALFWORD_HEAP
if (mk == &low_mem) {
seg = pmmap(size);
@@ -348,14 +348,19 @@ mseg_create(MemKind* mk, Uint size)
else
#endif
{
- seg = (void *) mmap((void *) 0, (size_t) size,
- MMAP_PROT, MMAP_FLAGS, MMAP_FD, 0);
- if (seg == (void *) MAP_FAILED)
- seg = NULL;
- }
+#if defined(ERTS_MSEG_FAKE_SEGMENTS)
+ seg = erts_sys_alloc(ERTS_ALC_N_INVALID, NULL, size);
+#elif HAVE_MMAP
+ {
+ seg = (void *) mmap((void *) 0, (size_t) size,
+ MMAP_PROT, MMAP_FLAGS, MMAP_FD, 0);
+ if (seg == (void *) MAP_FAILED)
+ seg = NULL;
+ }
#else
-#error "Missing mseg_create() implementation"
+# error "Missing mseg_create() implementation"
#endif
+ }
INC_CC(create);
@@ -365,9 +370,6 @@ mseg_create(MemKind* mk, Uint size)
static ERTS_INLINE void
mseg_destroy(MemKind* mk, void *seg, Uint size)
{
-#if defined(ERTS_MSEG_FAKE_SEGMENTS)
- erts_sys_free(ERTS_ALC_N_INVALID, NULL, seg);
-#elif HAVE_MMAP
int res;
#if HALFWORD_HEAP
@@ -377,14 +379,18 @@ mseg_destroy(MemKind* mk, void *seg, Uint size)
else
#endif
{
+#ifdef ERTS_MSEG_FAKE_SEGMENTS
+ erts_sys_free(ERTS_ALC_N_INVALID, NULL, seg);
+ res = 0;
+#elif HAVE_MMAP
res = munmap((void *) seg, size);
+#else
+# error "Missing mseg_destroy() implementation"
+#endif
}
ASSERT(size % page_size == 0);
ASSERT(res == 0);
-#else
-#error "Missing mseg_destroy() implementation"
-#endif
INC_CC(destroy);
@@ -400,9 +406,6 @@ mseg_recreate(MemKind* mk, void *old_seg, Uint old_size, Uint new_size)
ASSERT(old_size % page_size == 0);
ASSERT(new_size % page_size == 0);
-#if defined(ERTS_MSEG_FAKE_SEGMENTS)
- new_seg = erts_sys_realloc(ERTS_ALC_N_INVALID, NULL, old_seg, new_size);
-#elif HAVE_MREMAP
#if HALFWORD_HEAP
if (mk == &low_mem) {
new_seg = (void *) pmremap((void *) old_seg,
@@ -412,6 +415,10 @@ mseg_recreate(MemKind* mk, void *old_seg, Uint old_size, Uint new_size)
else
#endif
{
+#if defined(ERTS_MSEG_FAKE_SEGMENTS)
+ new_seg = erts_sys_realloc(ERTS_ALC_N_INVALID, NULL, old_seg, new_size);
+#elif HAVE_MREMAP
+
#if defined(__NetBSD__)
new_seg = (void *) mremap((void *) old_seg,
(size_t) old_size,
@@ -426,10 +433,10 @@ mseg_recreate(MemKind* mk, void *old_seg, Uint old_size, Uint new_size)
#endif
if (new_seg == (void *) MAP_FAILED)
new_seg = NULL;
- }
#else
#error "Missing mseg_recreate() implementation"
#endif
+ }
INC_CC(recreate);
@@ -726,6 +733,7 @@ mseg_alloc(ErtsAlcType_t atype, Uint *size_p, const ErtsMsegOpt_t *opt)
if (seg)
ERTS_MSEG_ALLOC_STAT(mk,size);
+
return seg;
}
@@ -1685,11 +1693,14 @@ static void *do_map(void *ptr, size_t 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) {
#ifdef HARDDEBUG
@@ -1789,10 +1800,19 @@ static int initialize_pmmap(void)
MAP_NORESERVE | EXTRA_MAP_FLAGS,
-1 , 0);
#ifdef HARDDEBUG
- printf("rsz = %ld, pages = %ld, rptr = %p\r\n",
- (unsigned long) rsz, (unsigned long) (rsz / pagsz),
- (void *) rptr);
+ printf("p=%p, rsz = %ld, pages = %ld, got range = %p -> %p\r\n",
+ p, (unsigned long) rsz, (unsigned long) (rsz / pagsz),
+ (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,pagsz)) {
erl_exit(1,"Could not actually mmap first page for halfword emulator...\n");
}