Merge branch 'maint'

* maint:
  Fix observer retrieval of alloc info
  Fix documentation of the +MMsco switch
  Replace the +MMscmgc switch with +MMscrfsd
  Add switch for disabling sys_alloc carriers
  Add support for locking mappings to physical memory

3 files changed, 68 insertions, 14 deletions

diff --git a/erts/emulator/beam/erl_alloc.c b/erts/emulator/beam/erl_alloc.c
index d8da616d05..b5ba9bb94a 100644
--- a/erts/emulator/beam/erl_alloc.c
+++ b/erts/emulator/beam/erl_alloc.c
@@ -100,6 +100,8 @@ static Uint install_debug_functions(void);
 #endif
 #endif
 
+static int lock_all_physical_memory = 0;
+
 ErtsAllocatorFunctions_t erts_allctrs[ERTS_ALC_A_MAX+1];
 ErtsAllocatorInfo_t erts_allctrs_info[ERTS_ALC_A_MAX+1];
 ErtsAllocatorThrSpec_t erts_allctr_thr_spec[ERTS_ALC_A_MAX+1];
@@ -618,6 +620,8 @@ erts_alloc_init(int *argc, char **argv, ErtsAllocInitOpts *eaiop)
     hdbg_init();
 #endif
 
+    lock_all_physical_memory = 0;
+
     ncpu = eaiop->ncpu;
     if (ncpu < 1)
 	ncpu = 1;
@@ -641,6 +645,20 @@ erts_alloc_init(int *argc, char **argv, ErtsAllocInitOpts *eaiop)
     if (argc && argv)
 	handle_args(argc, argv, &init);
 
+    if (lock_all_physical_memory) {
+#ifdef HAVE_MLOCKALL
+	errno = 0;
+	if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0) {
+	    int err = errno;
+	    char *errstr = err ? strerror(err) : "unknown";
+	    erl_exit(-1, "Failed to lock physical memory: %s (%d)\n",
+		     errstr, err);
+	}
+#else
+	erl_exit(-1, "Failed to lock physical memory: Not supported\n");
+#endif
+    }
+
 #ifndef ERTS_SMP
     init.sl_alloc.thr_spec = 0;
     init.std_alloc.thr_spec = 0;
@@ -1486,11 +1504,11 @@ handle_args(int *argc, char **argv, erts_alc_hndl_args_init_t *init)
 #endif
 			    get_bool_value(argv[i]+8, argv, &i);
 		    }
-		    else if (has_prefix("scmgc", argv[i]+3)) {
+		    else if (has_prefix("scrfsd", argv[i]+3)) {
 #if HAVE_ERTS_MSEG
-			init->mseg.mmap.scmgc =
+			init->mseg.mmap.scrfsd =
 #endif
-			    get_amount_value(argv[i]+8, argv, &i);
+			    get_amount_value(argv[i]+9, argv, &i);
 		    }
 		    else {
 			bad_param(param, param+2);
@@ -1630,6 +1648,19 @@ handle_args(int *argc, char **argv, erts_alc_hndl_args_init_t *init)
 			bad_param(param, param+2);
 		    }
 		    break;
+		case 'l':
+		    if (has_prefix("pm", param+2)) {
+			arg = get_value(argv[i]+5, argv, &i);
+			if (strcmp("all", arg) == 0)
+			    lock_all_physical_memory = 1;
+			else if (strcmp("no", arg) == 0)
+			    lock_all_physical_memory = 0;
+			else
+			    bad_value(param, param+4, arg);
+			break;
+		    }
+		    bad_param(param, param+2);
+		    break;
 		case 'u':
 		    if (has_prefix("ycs", argv[i]+3)) {
 			init->alloc_util.ycs
@@ -1639,6 +1670,10 @@ handle_args(int *argc, char **argv, erts_alc_hndl_args_init_t *init)
 			init->alloc_util.mmc
 			    = get_amount_value(argv[i]+6, argv, &i);
 		    }
+		    else if (has_prefix("sac", argv[i]+3)) {
+			init->alloc_util.sac
+			    = get_bool_value(argv[i]+6, argv, &i);
+		    }
 		    else {
 			int a;
 			int start = i;
@@ -2749,8 +2784,8 @@ erts_allocator_options(void *proc)
 #endif
     Uint sz, *szp, *hp, **hpp;
     Eterm res, features, settings;
-    Eterm atoms[ERTS_ALC_A_MAX-ERTS_ALC_A_MIN+6];
-    Uint terms[ERTS_ALC_A_MAX-ERTS_ALC_A_MIN+6];
+    Eterm atoms[ERTS_ALC_A_MAX-ERTS_ALC_A_MIN+7];
+    Uint terms[ERTS_ALC_A_MAX-ERTS_ALC_A_MIN+7];
     int a, length;
     SysAllocStat sas;
     Uint *endp = NULL;
@@ -2848,6 +2883,11 @@ erts_allocator_options(void *proc)
 	terms[length++] = erts_bld_2tup_list(hpp, szp, 3, o, v);
     }
 
+    atoms[length] = am_atom_put("lock_physical_memory", 20);
+    terms[length++] = (lock_all_physical_memory
+		       ? am_atom_put("all", 3)
+		       : am_atom_put("no", 2));
+
     settings = erts_bld_2tup_list(hpp, szp, length, atoms, terms);
 
     length = 0;
diff --git a/erts/emulator/beam/erl_alloc_util.c b/erts/emulator/beam/erl_alloc_util.c
index 1fdee4db2c..b0fc653f32 100644
--- a/erts/emulator/beam/erl_alloc_util.c
+++ b/erts/emulator/beam/erl_alloc_util.c
@@ -98,6 +98,7 @@ static Uint sys_alloc_carrier_size;
 #if HAVE_ERTS_MSEG
 static Uint max_mseg_carriers;
 #endif
+static int allow_sys_alloc_carriers;
 
 #define ONE_GIGA (1000000000)
 
@@ -3256,13 +3257,15 @@ create_carrier(Allctr_t *allctr, Uint umem_sz, UWord flags)
     int is_mseg = 0;
 #endif
 
-#if HALFWORD_HEAP
-    flags |= CFLG_FORCE_MSEG;
-#elif ERTS_SUPER_ALIGNED_MSEG_ONLY
-    if (flags & CFLG_MBC) {
+    if (HALFWORD_HEAP
+	|| (ERTS_SUPER_ALIGNED_MSEG_ONLY && (flags & CFLG_MBC))
+	|| !allow_sys_alloc_carriers) {
 	flags |= CFLG_FORCE_MSEG;
-    }
+	flags &= ~CFLG_FORCE_SYS_ALLOC;
+#if !HAVE_ERTS_MSEG
+	return NULL;
 #endif
+    }
 
     ASSERT((flags & CFLG_SBC && !(flags & CFLG_MBC))
 	   || (flags & CFLG_MBC && !(flags & CFLG_SBC)));
@@ -3697,6 +3700,7 @@ static struct {
     Eterm mmc;
 #endif
     Eterm ycs;
+    Eterm sac;
 
     Eterm fix_types;
 
@@ -3789,6 +3793,7 @@ init_atoms(Allctr_t *allctr)
 	AM_INIT(mmc);
 #endif
 	AM_INIT(ycs);
+	AM_INIT(sac);
 
 	AM_INIT(fix_types);
 
@@ -4509,17 +4514,22 @@ erts_alcu_au_info_options(int *print_to_p, void *print_to_arg,
 #if HAVE_ERTS_MSEG
 		   "option mmc: %beu\n"
 #endif
-		   "option ycs: %beu\n",
+		   "option ycs: %beu\n"
+		   "option sac: %s\n",
 #if HAVE_ERTS_MSEG
 		   max_mseg_carriers,
 #endif
-		   sys_alloc_carrier_size);
+		   sys_alloc_carrier_size,
+		   allow_sys_alloc_carriers ? "true" : "false");
     }
 
     if (hpp || szp) {
 	res = NIL;
 	ensure_atoms_initialized(NULL);
 	add_2tup(hpp, szp, &res,
+		 am.sac,
+		 allow_sys_alloc_carriers ? am_true : am_false);
+	add_2tup(hpp, szp, &res,
 		 am.ycs,
 		 bld_uint(hpp, szp, sys_alloc_carrier_size));
 #if HAVE_ERTS_MSEG
@@ -5681,6 +5691,7 @@ erts_alcu_init(AlcUInit_t *init)
 #else /* #if HAVE_ERTS_MSEG */
     sys_alloc_carrier_size = ((init->ycs + 4095) / 4096) * 4096;
 #endif
+    allow_sys_alloc_carriers = init->sac;
 
 #ifdef DEBUG
     carrier_alignment = sizeof(Unit_t);
diff --git a/erts/emulator/beam/erl_alloc_util.h b/erts/emulator/beam/erl_alloc_util.h
index 222f137024..7be6b1ed9d 100644
--- a/erts/emulator/beam/erl_alloc_util.h
+++ b/erts/emulator/beam/erl_alloc_util.h
@@ -32,6 +32,7 @@ typedef struct Allctr_t_ Allctr_t;
 typedef struct {
     UWord ycs;
     UWord mmc;
+    int   sac;
 } AlcUInit_t;
 
 typedef struct {
@@ -75,7 +76,8 @@ typedef struct {
 
 #define ERTS_DEFAULT_ALCU_INIT {                                           \
     1024*1024,		/* (bytes)  ycs:    sys_alloc carrier size       */\
-    ~((UWord) 0)	/* (amount) mmc:    max mseg carriers            */ \
+    ~((UWord) 0),	/* (amount) mmc:    max mseg carriers            */\
+    1			/* (bool)   sac:    sys_alloc carriers           */\
 }
 
 #define ERTS_DEFAULT_ALLCTR_INIT {                                         \
@@ -109,7 +111,8 @@ typedef struct {
 
 #define ERTS_DEFAULT_ALCU_INIT {                                           \
     128*1024,		/* (bytes)  ycs:    sys_alloc carrier size       */\
-    1024      		/* (amount) mmc:    max mseg carriers            */\
+    1024,      		/* (amount) mmc:    max mseg carriers            */\
+    1			/* (bool)   sac:    sys_alloc carriers           */\
 }
 
 #define ERTS_DEFAULT_ALLCTR_INIT {                                         \