diff --git a/erts/emulator/beam/dist.c b/erts/emulator/beam/dist.c
index f179061d5640..74d3b6a76b71 100644
--- a/erts/emulator/beam/dist.c
+++ b/erts/emulator/beam/dist.c
@@ -2174,10 +2174,10 @@ int erts_net_message(Port *prt,
 	goto decode_error;
     }
 
-    /* Fill the unused part of the hfrag with a bignum header */
+    /* Fill the unused part of the hfrag */
     if (ede_hfrag && ede_hfrag->mem + ede_hfrag->used_size > factory.hp) {
         Uint slot = factory.hp - ede_hfrag->mem;
-        ede_hfrag->mem[slot] = make_pos_bignum_header(ede_hfrag->used_size - slot - 1);
+        erts_write_heap_filler(&ede_hfrag->mem[slot], ede_hfrag->used_size - slot);
     }
 
     if (is_not_tuple(arg) || 
diff --git a/erts/emulator/beam/erl_bif_info.c b/erts/emulator/beam/erl_bif_info.c
index d60db9006528..d3c01e1bb509 100644
--- a/erts/emulator/beam/erl_bif_info.c
+++ b/erts/emulator/beam/erl_bif_info.c
@@ -5135,7 +5135,7 @@ BIF_RETTYPE erts_debug_set_internal_state_2(BIF_ALIST_2)
             UWord left = HeapWordsLeft(BIF_P);
             if (left > 1) {
                 Eterm* hp = HAlloc(BIF_P, left);
-                *hp = make_pos_bignum_header(left - 1);
+                erts_write_heap_filler(hp, left);
             }
             if (BIF_ARG_2 == am_true) {
                 FLAGS(BIF_P) |= F_NEED_FULLSWEEP;
diff --git a/erts/emulator/beam/erl_gc.c b/erts/emulator/beam/erl_gc.c
index f1902a238ca5..11e8974f8d78 100644
--- a/erts/emulator/beam/erl_gc.c
+++ b/erts/emulator/beam/erl_gc.c
@@ -566,7 +566,7 @@ delay_garbage_collection(Process *p, int need, int fcalls)
     else {
 	/* Do not leave a hole in the abandoned heap... */
 	if (orig_htop < orig_hend) {
-	    *orig_htop = make_pos_bignum_header(orig_hend-orig_htop-1);
+	    erts_write_heap_filler(orig_htop, orig_hend-orig_htop);
 	    if (orig_htop + 1 < orig_hend) {
 		orig_hend[-1] = (Uint) (orig_htop - orig_heap);
 		p->flags |= F_ABANDONED_HEAP_USE;
diff --git a/erts/emulator/beam/erl_map.c b/erts/emulator/beam/erl_map.c
index 13a3af61dace..bdbd10d22234 100644
--- a/erts/emulator/beam/erl_map.c
+++ b/erts/emulator/beam/erl_map.c
@@ -457,11 +457,11 @@ static Eterm flatmap_from_validated_list(Process *p, Eterm list, Eterm fill_valu
 
     if (unused_size) {
 	/* the key tuple is embedded in the heap
-	 * write a bignum to clear it.
+	 * write a heap filler to clear it.
 	 */
 	/* release values as normal since they are on the top of the heap */
 
-	ks[size] = make_pos_bignum_header(unused_size - 1);
+	erts_write_heap_filler(ks + size, unused_size);
 	HRelease(p, vs + size + unused_size, vs + size);
     }
 
@@ -1384,8 +1384,8 @@ static Eterm flatmap_merge(Process *p, Eterm map1, Eterm map2) {
             hp_release = thp - unused_size;
         }
         else {
-            /* Unused values are embedded in the heap, write bignum to clear them */
-            *vs = make_pos_bignum_header(unused_size - 1);
+            /* Unused values are embedded in the heap, write filler to clear them */
+            erts_write_heap_filler(vs, unused_size);
             /* Release unused keys */
             hp_release = ks;
         }
@@ -2220,7 +2220,7 @@ Eterm erts_maps_put(Process *p, Eterm key, Eterm value, Eterm map) {
 	 * this will work out fine once we get the size word
 	 * in the header.
 	 */
-	*shp = make_pos_bignum_header(0);
+	erts_write_heap_filler(shp, 1);
 	return res;
 
 found_key:
diff --git a/erts/emulator/beam/erl_term.h b/erts/emulator/beam/erl_term.h
index 1c5603d04245..9cff7c3b4992 100644
--- a/erts/emulator/beam/erl_term.h
+++ b/erts/emulator/beam/erl_term.h
@@ -1457,8 +1457,16 @@ do { \
 #define ET_ASSERT(expr,file,line)	do { } while(0)
 #endif
 
+ERTS_GLB_INLINE void erts_write_heap_filler(Eterm *hp, size_t sz);
+
 #if ERTS_GLB_INLINE_INCL_FUNC_DEF
 
+ERTS_GLB_INLINE void erts_write_heap_filler(Eterm *hp, size_t sz)
+{
+    ASSERT(sz > 0);
+    *hp = make_pos_bignum_header(sz - 1);
+}
+
 #if ET_DEBUG
 ERTS_GLB_INLINE unsigned tag_val_def(Eterm x, const char *file, unsigned line)
 #else
diff --git a/erts/emulator/beam/jit/beam_jit_metadata.cpp b/erts/emulator/beam/jit/beam_jit_metadata.cpp
index d9fd53db7306..6af9726620bb 100644
--- a/erts/emulator/beam/jit/beam_jit_metadata.cpp
+++ b/erts/emulator/beam/jit/beam_jit_metadata.cpp
@@ -467,7 +467,12 @@ class JitPerfMap {
 public:
     bool init() {
         char name[MAXPATHLEN];
-        snprintf(name, sizeof(name), "/tmp/perf-%i.map", getpid());
+        size_t namesz = sizeof(name);
+
+        if (erts_sys_explicit_host_getenv("ERL_SYM_MAP_FILE", name, &namesz) !=
+            1) {
+            snprintf(name, sizeof(name), "/tmp/perf-%i.map", getpid());
+        }
         file = fopen(name, "w");
         if (!file) {
             int saved_errno = errno;
diff --git a/erts/emulator/beam/sys.h b/erts/emulator/beam/sys.h
index 6527189e9ed1..02ab60816624 100644
--- a/erts/emulator/beam/sys.h
+++ b/erts/emulator/beam/sys.h
@@ -867,7 +867,7 @@ int erts_sys_explicit_8bit_putenv(char *key, char *value);
 
 /* This is identical to erts_sys_explicit_8bit_getenv but falls down to the
  * host OS implementation instead of erts_osenv. */
-int erts_sys_explicit_host_getenv(char *key, char *value, size_t *size);
+int erts_sys_explicit_host_getenv(const char *key, char *value, size_t *size);
 
 const erts_osenv_t *erts_sys_rlock_global_osenv(void);
 void erts_sys_runlock_global_osenv(void);
diff --git a/erts/emulator/sys/unix/sys_env.c b/erts/emulator/sys/unix/sys_env.c
index eb98e7b63529..47acd8f2059a 100644
--- a/erts/emulator/sys/unix/sys_env.c
+++ b/erts/emulator/sys/unix/sys_env.c
@@ -87,7 +87,7 @@ int erts_sys_explicit_8bit_getenv(char *key, char *value, size_t *size) {
     return result;
 }
 
-int erts_sys_explicit_host_getenv(char *key, char *value, size_t *size) {
+int erts_sys_explicit_host_getenv(const char *key, char *value, size_t *size) {
     char *orig_value;
     size_t length;
     
diff --git a/erts/emulator/sys/win32/sys_env.c b/erts/emulator/sys/win32/sys_env.c
index 4c4b89adab7d..ea8ad1449ddb 100644
--- a/erts/emulator/sys/win32/sys_env.c
+++ b/erts/emulator/sys/win32/sys_env.c
@@ -58,7 +58,7 @@ void erts_sys_rwunlock_global_osenv() {
     erts_rwmtx_rwunlock(&sysenv_rwmtx);
 }
 
-int erts_sys_explicit_host_getenv(char *key, char *value, size_t *size) {
+int erts_sys_explicit_host_getenv(const char *key, char *value, size_t *size) {
     size_t new_size = GetEnvironmentVariableA(key, value, (DWORD)*size);
 
     if(new_size == 0 && GetLastError() == ERROR_ENVVAR_NOT_FOUND) {
diff --git a/erts/etc/unix/cerl.src b/erts/etc/unix/cerl.src
index 05deeea3e363..bf64654a2caf 100644
--- a/erts/etc/unix/cerl.src
+++ b/erts/etc/unix/cerl.src
@@ -387,14 +387,11 @@ if [ "x$GDB" = "x" ]; then
         if [ $EMU_NAME = "beam.valgrind.smp" ] && [ "x${VALGRIND_LOG_DIR}" != "x" ]; then
             # Always enable `perf` support as we use the same symbol map
             emu_xargs="$emu_xargs -JPperf true "
-            set -m
-	    $taskset1 valgrind $valgrind_xml $valgrind_log $vgflags $BINDIR/$EMU_NAME $sched_arg $emu_xargs "$@" &
-            VG_PID=$!
-            fg
+	    export ERL_SYM_MAP_FILE="/tmp/cerl.valgrind.$$.map"
+	    $taskset1 valgrind $valgrind_xml $valgrind_log $vgflags $BINDIR/$EMU_NAME $sched_arg $emu_xargs "$@"
             VG_EXIT=$?
-            set +m
-            if [ -f /tmp/perf-$VG_PID.map ]; then
-                $ERL_TOP/scripts/valgrind_beamasm_update.escript $valgrind_log_file /tmp/perf-$VG_PID.map
+            if [ -f $ERL_SYM_MAP_FILE ]; then
+                $ERL_TOP/scripts/valgrind_beamasm_update.escript $valgrind_log_file $ERL_SYM_MAP_FILE
             fi
             exit $VG_EXIT
         else