Improve binary garbage collection

The garbage collector in r13b03 is too aggressive in some cases. This
commit raises the level of default initial allowed binary garbage
(virtual heap for binaries) before collecting from 233 words to
46368 words (181 kB on 32-bit).

A new option, min_bin_vheap_size, has been added to spawn_opt,
system_flag and process_flag can be used to change the default values.

The option can also be used with system_info and process_info to
inspect the values.

For symmetry the option min_heap_size has been added to the above
functions where it was previously missing.

Add testcases for min_bin_vheap_size and min_heap_size for
functions process_flag/2, process_info/2, system_info/2 and
spawn_opt/2.

1 files changed, 15 insertions, 12 deletions

diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c
index a4afe0574f..ed907f05de 100644
--- a/erts/emulator/beam/erl_process.c
+++ b/erts/emulator/beam/erl_process.c
@@ -6272,7 +6272,7 @@ Process *schedule(Process *p, int calls)
 	    erts_check_my_tracer_proc(p);
 #endif
 
-	if ((FLAGS(p) & F_FORCE_GC) || (MSO(p).overhead >= BIN_VHEAP_SZ(p))) {
+	if ((FLAGS(p) & F_FORCE_GC) || (MSO(p).overhead > BIN_VHEAP_SZ(p))) {
 	    reds -= erts_garbage_collect(p, 0, p->arg_reg, p->arity);
 	    if (reds < 0) {
 		reds = 1;
@@ -6683,13 +6683,15 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
      * noone except us has access to the process.
      */
     if (so->flags & SPO_USE_ARGS) {
-	p->min_heap_size = so->min_heap_size;
-	p->prio = so->priority;
-	p->max_gen_gcs = so->max_gen_gcs;
+	p->min_heap_size  = so->min_heap_size;
+	p->min_vheap_size = so->min_vheap_size;
+	p->prio           = so->priority;
+	p->max_gen_gcs    = so->max_gen_gcs;
     } else {
-	p->min_heap_size = H_MIN_SIZE;
-	p->prio = PRIORITY_NORMAL;
-	p->max_gen_gcs = (Uint16) erts_smp_atomic_read(&erts_max_gen_gcs);
+	p->min_heap_size  = H_MIN_SIZE;
+	p->min_vheap_size = BIN_VH_MIN_SIZE;
+	p->prio           = PRIORITY_NORMAL;
+	p->max_gen_gcs    = (Uint16) erts_smp_atomic_read(&erts_max_gen_gcs);
     }
     p->skipped = 0;
     ASSERT(p->min_heap_size == erts_next_heap_size(p->min_heap_size, 0));
@@ -6736,9 +6738,9 @@ erl_create_process(Process* parent, /* Parent of process (default group leader).
     p->heap_sz = sz;
     p->catches = 0;
 
-    p->bin_vheap_sz = H_MIN_SIZE;
-    p->bin_old_vheap_sz = H_MIN_SIZE;
-    p->bin_old_vheap = 0;
+    p->bin_vheap_sz     = p->min_vheap_size;
+    p->bin_old_vheap_sz = p->min_vheap_size;
+    p->bin_old_vheap    = 0;
 
     /* No need to initialize p->fcalls. */
 
@@ -6969,6 +6971,7 @@ void erts_init_empty_process(Process *p)
     p->gen_gcs = 0;
     p->max_gen_gcs = 0;
     p->min_heap_size = 0;
+    p->min_vheap_size = 0;
     p->status = P_RUNABLE;
     p->gcstatus = P_RUNABLE;
     p->rstatus = P_RUNABLE;
@@ -6985,8 +6988,8 @@ void erts_init_empty_process(Process *p)
     p->ftrace = NIL;
     p->fcalls = 0;
 
-    p->bin_vheap_sz=H_MIN_SIZE;
-    p->bin_old_vheap_sz=H_MIN_SIZE;
+    p->bin_vheap_sz = BIN_VH_MIN_SIZE;
+    p->bin_old_vheap_sz = BIN_VH_MIN_SIZE;
     p->bin_old_vheap = 0;
 #ifdef ERTS_SMP
     p->u.ptimer = NULL;