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authorRickard Green <[email protected]>2013-11-04 17:18:52 +0100
committerRickard Green <[email protected]>2013-11-05 17:38:49 +0100
commitf17532112c6b723a7b025c7d74565e7ac2588cbb (patch)
tree584e41b8723638b4c35c5be1c32c5423379281e9 /erts/emulator
parent90b1b181d4fb147dfb7403e910a057289bdd21b2 (diff)
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Add support for locking mappings to physical memory
Using "+Mlpm all" switch all mappings made by the emulator will be locked into physical memory.
Diffstat (limited to 'erts/emulator')
-rw-r--r--erts/emulator/beam/erl_alloc.c40
1 files changed, 38 insertions, 2 deletions
diff --git a/erts/emulator/beam/erl_alloc.c b/erts/emulator/beam/erl_alloc.c
index d8da616d05..8e20d58161 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;
@@ -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
@@ -2749,8 +2780,8 @@ 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 +2879,11 @@ 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;