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| author | Magnus Lång <[email protected]> | 2017-04-08 10:48:01 +0200 |
|---|---|---|
| committer | Magnus Lång <[email protected]> | 2017-11-05 20:52:48 +0100 |
| commit | 7503303b0cba1e02320bdf604e0d0997b7c2ff59 (patch) | |
| tree | 6cd3f5e63fa2cbe190a45359457076f3659a6575 /erts | |
| parent | 14250efc69cacde4310aeb89b3b1ef631d8e5fe9 (diff) | |
| download | otp-7503303b0cba1e02320bdf604e0d0997b7c2ff59.tar.gz otp-7503303b0cba1e02320bdf604e0d0997b7c2ff59.tar.bz2 otp-7503303b0cba1e02320bdf604e0d0997b7c2ff59.zip | |
HiPE: Support literal tags
Literal tags are used by the VM as an alternative to reserving a large
virtual memory space in order to be able to quickly identify which terms
are literals. The use of literal tags harms performance, but is useful
to support systems where allocating a large amount of virtual memory is
not an option.
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/emulator/beam/erl_term.h | 3 | ||||
| -rw-r--r-- | erts/emulator/hipe/hipe_mkliterals.c | 9 |
2 files changed, 9 insertions, 3 deletions
diff --git a/erts/emulator/beam/erl_term.h b/erts/emulator/beam/erl_term.h index 5ec6b6b44b..7d42d1b396 100644 --- a/erts/emulator/beam/erl_term.h +++ b/erts/emulator/beam/erl_term.h @@ -55,9 +55,6 @@ struct erl_node_; /* Declared in erl_node_tables.h */ #if defined(ARCH_64) # define TAG_PTR_MASK__ 0x7 # if !defined(ERTS_HAVE_OS_PHYSICAL_MEMORY_RESERVATION) -# ifdef HIPE -# error Hipe on 64-bit needs a real mmap as it does not support the literal tag -# endif # define TAG_LITERAL_PTR 0x4 # else # undef TAG_LITERAL_PTR diff --git a/erts/emulator/hipe/hipe_mkliterals.c b/erts/emulator/hipe/hipe_mkliterals.c index 6ea120c65c..de00994d64 100644 --- a/erts/emulator/hipe/hipe_mkliterals.c +++ b/erts/emulator/hipe/hipe_mkliterals.c @@ -462,6 +462,15 @@ static const struct rts_param rts_params[] = { 0 #endif }, + /* This flag is always defined, but its value is configuration-dependent. */ + { 17, "ERTS_USE_LITERAL_TAG", + 1, +#if defined(TAG_LITERAL_PTR) + 1 +#else + 0 +#endif + }, /* This parameter is always defined, but its value depends on ERTS_SMP. */ { 19, "MSG_MESSAGE", 1, offsetof(struct erl_mesg, m[0]) |