diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/doc/src/erlang.xml | 8 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_alloc.c | 70 |
2 files changed, 77 insertions, 1 deletions
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 19f501391f..f98e15cb52 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -2356,6 +2356,14 @@ os_prompt%</pre> <seealso marker="tools:instrument">instrument(3)</seealso> and/or <seealso marker="erts:erl">erl(1)</seealso>.</p> </item> + <tag><c>low</c></tag> + <item> + <p>Only on 64-bit halfword emulator.</p> + <p>The total amount of memory allocated in low memory areas + that are restricted to less than 4 Gb even though + the system may have more physical memory.</p> + <p>May be removed in future releases of halfword emulator.</p> + </item> </taglist> <note> <p>The <c>system</c> value is not complete. Some allocated diff --git a/erts/emulator/beam/erl_alloc.c b/erts/emulator/beam/erl_alloc.c index d2d7c6da8e..cda404af5e 100644 --- a/erts/emulator/beam/erl_alloc.c +++ b/erts/emulator/beam/erl_alloc.c @@ -550,6 +550,7 @@ erts_alloc_init(int *argc, char **argv, ErtsAllocInitOpts *eaiop) erts_allctrs_info[ERTS_ALC_A_SYSTEM].enabled = 1; #if HALFWORD_HEAP + /* Init low memory variants by cloning */ init.std_alloc_low = init.std_alloc; init.std_alloc_low.init.util.alloc_no = ERTS_ALC_A_STANDARD_LOW; init.std_alloc_low.init.util.low_mem = 1; @@ -1605,6 +1606,49 @@ alcu_size(ErtsAlcType_t ai) return res; } +#if HALFWORD_HEAP +static ERTS_INLINE int +alcu_is_low(ErtsAlcType_t ai) +{ + int is_low = 0; + ASSERT(erts_allctrs_info[ai].enabled); + ASSERT(erts_allctrs_info[ai].alloc_util); + + if (!erts_allctrs_info[ai].thr_spec) { + Allctr_t *allctr = erts_allctrs_info[ai].extra; + is_low = allctr->mseg_opt.low_mem; + } + else { + ErtsAllocatorThrSpec_t *tspec = &erts_allctr_thr_spec[ai]; + int i; +# ifdef DEBUG + int found_one = 0; +# endif + + ASSERT(tspec->all_thr_safe); + ASSERT(tspec->enabled); + + for (i = tspec->size - 1; i >= 0; i--) { + Allctr_t *allctr = tspec->allctr[i]; + if (allctr) { +# ifdef DEBUG + if (!found_one) { + is_low = allctr->mseg_opt.low_mem; + found_one = 1; + } + else ASSERT(is_low == allctr->mseg_opt.low_mem); +# else + is_low = allctr->mseg_opt.low_mem; + break; +# endif + } + } + ASSERT(found_one); + } + return is_low; +} +#endif /* HALFWORD */ + Eterm erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) { @@ -1621,6 +1665,9 @@ erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) int code; int ets; int maximum; +#if HALFWORD_HEAP + int low; +#endif } want = {0}; struct { UWord total; @@ -1633,6 +1680,9 @@ erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) UWord code; UWord ets; UWord maximum; +#if HALFWORD_HEAP + UWord low; +#endif } size = {0}; Eterm atoms[sizeof(size)/sizeof(UWord)]; UWord *uintps[sizeof(size)/sizeof(UWord)]; @@ -1688,7 +1738,11 @@ erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) atoms[length] = am_maximum; uintps[length++] = &size.maximum; } - +#if HALFWORD_HEAP + want.low = 1; + atoms[length] = am_low; + uintps[length++] = &size.low; +#endif } else { DeclareTmpHeapNoproc(tmp_heap,2); @@ -1782,6 +1836,15 @@ erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) return am_badarg; } break; +#if HALFWORD_HEAP + case am_low: + if (!want.low) { + want.low = 1; + atoms[length] = am_low; + uintps[length++] = &size.low; + } + break; +#endif default: UnUseTmpHeapNoproc(2); return am_badarg; @@ -1856,6 +1919,11 @@ erts_memory(int *print_to_p, void *print_to_arg, void *proc, Eterm earg) if (save) *save = asz; size.total += asz; +#if HALFWORD_HEAP + if (alcu_is_low(ai)) { + size.low += asz; + } +#endif } } } |