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When an instruction with a variable number operands (such as
select_val) is seen of the left side of a transformation, the
'next_arg' instruction will allocate a buffer to fit all variables and
all operands will be copied into the buffer. Very often, the 'commit'
instruction will never be reached because of a test or predicate
failing or because of a short window; in that case, the variable
buffer will be deallocated.
Note that originally there were only few instructions with a variable
number of operands, but now common operations such as tuple building
also have a variable number of operands.
To avoid those frequent allocations and deallocations, modify the
'next_arg' instruction to only save a pointer to the first of the
"rest" arguments. Also move the deallocation of the instructions
on the left side from the 'commit' instruction to the 'end'
instruction to ensure that 'store_rest_args' will still work.
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We used to set last_op_next and last_op to NULL just in case.
Setting last_op_next to causes a rescan of the instructions
to find the last instruction in the chain, so we would want
to avoid that unless really necessary.
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The transformation on the following line will do the job.
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=== OTP-18.3.1 ===
Changed Applications:
- erts-7.3.1
- inets-6.2.1
- mnesia-4.13.4
Unchanged Applications:
- asn1-4.0.2
- common_test-1.12
- compiler-6.0.3
- cosEvent-2.2
- cosEventDomain-1.2
- cosFileTransfer-1.2
- cosNotification-1.2.1
- cosProperty-1.2
- cosTime-1.2.1
- cosTransactions-1.3.1
- crypto-3.6.3
- debugger-4.1.2
- dialyzer-2.9
- diameter-1.11.2
- edoc-0.7.18
- eldap-1.2.1
- erl_docgen-0.4.2
- erl_interface-3.8.2
- et-1.5.1
- eunit-2.2.13
- gs-1.6
- hipe-3.15
- ic-4.4
- jinterface-1.6.1
- kernel-4.2
- megaco-3.18
- observer-2.1.2
- odbc-2.11.1
- orber-3.8.1
- os_mon-2.4
- ose-1.1
- otp_mibs-1.1
- parsetools-2.1.1
- percept-0.8.11
- public_key-1.1.1
- reltool-0.7
- runtime_tools-1.9.3
- sasl-2.7
- snmp-5.2.2
- ssh-4.2.2
- ssl-7.3
- stdlib-2.8
- syntax_tools-1.7
- test_server-3.10
- tools-2.8.3
- typer-0.9.10
- webtool-0.9.1
- wx-1.6.1
- xmerl-1.3.10
Conflicts:
OTP_VERSION
erts/emulator/test/save_calls_SUITE.erl
erts/vsn.mk
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* bjorn/erts/clang-opt:
Fix unsafe transformation of apply/3 with fixed arguments
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* egil/erts/fix-flatmap-get/OTP-13459:
erts: Don't search for non-existing Map keys twice
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* sverker/erts/trap_exit-race/OTP-13452:
erts: Fix race for process_flag(trap_exit,true)
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* rickard/proc-free-fix/OTP-13446:
Fix bad refc management of process struct
# Conflicts:
# erts/emulator/beam/erl_process.c
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* rickard/port-sig-dropped-fix/OTP-13424:
Fix implementation of dropped signal to port
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* rickard/last_calls/OTP-13418:
Unbreak process_info(Pid,last_calls)
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and a concurrent exit signal.
We now actually guarantee that the process will not die
from exit signal *after* the call to process_flag(trap_exit,true)
has returned.
The race is narrow and probably quite hard to observe even if you
manage to provoke it. Has only been confirmed with the help of
return trace and a sleep in send_exit_signal().
Solution:
Seize status lock to prevent send_exit_signal() from reading
an old status (without TRAP_EXIT) and then writing PENDING_EXIT
after TRAP_EXIT has been set by process_flag_2().
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* For maps:get/2,3 and maps:find/2, searching for an immediate key, e.g. an atom,
the search was performed twice if the key did not exist in the map.
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* rickard/proc-free-fix/OTP-13446:
Fix bad refc management of process struct
Conflicts:
erts/emulator/beam/erl_process.c
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62473daf introduced an unsafe optimization in the loader.
See the comments in the test case for an explanation of
the problem.
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* lukas/erts/enif_trace_functions/OTP-13442:
erts: Fix bug in enif_send
erts: Fix windows nif port tests
erts: Fix bug in enif_term_to_binary
erts: Remove printout when dec_term fails in DEBUG
erts: Polish erl_nif docs
erts: Improve enif_binary_to_term
erts: Add enif_port_command
erts: Add enif_term_to_binary and enif_binary_to_term
erts: Add enif_is_process/port_alive
erts: Add enif_cpu/now_time and enif_make_unique_integer
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Let cache_env() set env->heap_frag to same as MBUF(p)
as it is in any other case.
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Wait until after dec_term and factory_close to do cache_env(),
otherwise we will cache the wrong state.
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* Accept a raw data buffer instead of ErlNifBinary
* Accept option ERL_NIF_BIN2TERM_SAFE
* Return number of read bytes
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* rickard/improve-psd/OTP-13428:
Improve process/port specific data management
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* rickard/delayed-gc-fix:
Allow delayed gc while scheduled out
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* rickard/port-sig-dropped-fix/OTP-13424:
Fix implementation of dropped signal to port
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* lukas/erts/inline_tagvaldef/OTP-13440:
erts: inline tag_val_def
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The tag_val_def function was called and multiple switch statements
had to be traversed in term.c, and then a big switch in the calling
code to branch on the term types. By inlining the switches are
merged by the compiler and a lot fewer branches have to be taken.
Benchmarks show that this increases performance of enc_term by as
much as 10%.
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* lukas/erts/low_write_freq_darwin/OTP-12345:
erts: Fix LOW_WRITE section for non llvm os x compilation
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* lukas/erts/fix_scheduler_suspend/ERL-94/PR-978/OTP-13425:
erts: Fix install of suspend handler
Conflicts:
erts/emulator/sys/unix/erl_unix_sys.h
erts/emulator/sys/unix/sys.c
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This was accidentally removed in commit cd6903be0740db
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that could hang if concurrent deallocations was initiated.
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* vinoski/ds-avoid-lock:
Skip run queue lock check for dirty schedulers
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* rickard/ds-sched-suspend:
Improved scheduler suspend functionality
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- The calling process is now suspended while synchronizing
scheduler suspends via erlang:system_flag(schedulers_online, _)
and erlang:system_flag(multi_scheduling, _), instead of blocking
the scheduler thread in the BIF call waiting for the operation
to synchronize. Besides releasing the scheduler for other work
(or immediate suspend) it also makes it possible to abort the
operation by killing the process.
- erlang:system_flag(schedulers_online, _) now only wait for normal
schedulers to complete before it returns. This since it may take
a very long time before all dirty schedulers suspends.
- erlang:system_flag(multi_scheduling, block_normal|unblock_normal)
which only operate on normal schedulers has been introduced. This
since there are use cases where suspend of dirty schedulers are
not of interest (hipe loader).
- erlang:system_flag(multi_scheduling, block) still blocks all
dirty schedulers as well as all normal schedulers except one since
it is hard to redefine what multi scheduling block means.
- The three operations:
- changing amount of schedulers online
- blocking/unblocking normal multi scheduling
- blocking/unblocking full multi scheduling
can now be done in parallel. This is important since otherwise
a full multi scheduling block would potentially delay the other
operations for a very long time.
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* sverk/literal-alloc-polish:
erts: Add emulator flag +MIscs for literal super carrier size
erts: Refactor init of erts_literal_mmapper
erts: Make literal_alloc documented and configurable
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One little (unsigned long) left behind.
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* sverk/master/halt-INT_MIN:
erts: Make erlang:halt() accept bignums as Status
erts: Change erl_exit into erts_exit
kernel: Remove calls to erl_exit
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OTP-13251
* sverk/halt-INT_MIN:
erts: Make erlang:halt() accept bignums as Status
erts: Change erl_exit into erts_exit
kernel: Remove calls to erl_exit
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* bjorn/multiple-load/OTP-13111:
code: Add functions that can load multiple modules
Refactor post_beam_load handling
Simplify and robustify code_server:all_loaded/1
Update preloaded modules
Add erl_prim_loader:get_modules/3
Add has_prepared_code_on_load/1 BIF
Allow erlang:finish_loading/1 to load more than one module
beam_load.c: Add a function to check for an on_load function
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Conflicts:
erts/emulator/beam/erl_alloc.types
erts/emulator/beam/erl_bif_info.c
erts/emulator/beam/erl_process.c
erts/preloaded/ebin/erts_internal.beam
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