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In many cases sub-binaries costs more memory than converting them to heap-binaries.
Sub-binaries also has a hidden cost of pinning larger binaries in memory.
By converting binaries this cost is reduced.
Byte aligned sub-binaries upto 24 bytes (64-bit) or 12 bytes (32-bit) are converted.
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Magic references are *intentionally* indistinguishable from ordinary
references for the Erlang software. Magic references do not change
the language, and are intended as a pure runtime internal optimization.
An ordinary reference is typically used as a key in some table. A
magic reference has a direct pointer to a reference counted magic
binary. This makes it possible to implement various things without
having to do lookups in a table, but instead access the data directly.
Besides very fast lookups this can also improve scalability by
removing a potentially contended table. A couple of examples of
planned future usage of magic references are ETS table identifiers,
and BIF timer identifiers.
Besides future optimizations using magic references it should also
be possible to replace the exposed magic binary cludge with magic
references. That is, magic binaries that are exposed as empty
binaries to the Erlang software.
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* maint:
Atomic reference count of binaries also in non-SMP
Conflicts:
erts/emulator/beam/erl_fun.c
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OTP-14202
* rickard/binary-refc:
Atomic reference count of binaries also in non-SMP
Conflicts:
erts/emulator/beam/beam_bp.c
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NIF resources was not handled in a thread-safe manner in the runtime
system without SMP support.
As a consequence of this fix, the following driver functions are now
thread-safe also in the runtime system without SMP support:
- driver_free_binary()
- driver_realloc_binary()
- driver_binary_get_refc()
- driver_binary_inc_refc()
- driver_binary_dec_refc()
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* sverker/ASSERT_IN_ENV:
erts: Add macro ERTS_PROC_LOCKS_HIGHER_THAN
erts: Cleanup and extra assertions in nif_SUITE.c
erts: Cleanup enif_make_reverse_list
erts: Add assertions for correct ErlNifEnv
erts: Make erts_dbg_within_proc available
# Conflicts:
# erts/emulator/beam/erl_gc.h
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* sverker/trace_gc-bug:
erts: Fix GC tracing to use temp heap
erts: Assert sufficient space need after GC
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OTP-14152
* rickard/ds-features-20:
Remove experimental disclaimer on dirty schedulers
Scheduler wall time support for dirty schedulers
Always return info from system_info(dirty_[cpu|io]_schedulers*)
Improve etp-commands
Switch between scheduler types when multi-scheduling is blocked
Perform potentially long GC on dirty schedulers if available
Return and exception trace for nif-export scheduled BIFs
Optimize handling of BIF errors
Support for dirty BIFs
Reduction counting on non-tail return
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* maint:
Do not automatically define HARDDEBUG when DEBUG is defined
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* rickard/no-harddebug:
Do not automatically define HARDDEBUG when DEBUG is defined
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* maint:
Fix memory leak of temporary heap
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OTP-14135
* rickard/abandoned-heap-bugs:
Fix memory leak of temporary heap
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This bug was introduced in previous commit, and has never been
released in an official OTP version.
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* maint:
Fix issues with abandoned heap
Conflicts:
erts/emulator/beam/beam_bif_load.c
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OTP-14134
OTP-14135
* rickard/abandoned-heap-bugs:
Fix issues with abandoned heap
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Can't use HAlloc as it might consume part of callers 'need'.
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for debug assertions.
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* maint:
Multi scheduling block bug-fixes
Fix VM global GC info for dirty schedulers
Leave dirty work in dirty run-queues on multi scheduling block
Fix premature removal of process struct
Fix crash due to GC of node entry on dirty scheduler
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* maint:
Update etp-commands for dirty schedulers
Fix scheduling of system tasks on processes executing dirty
Fix call time tracing with dirty schedulers
Fix send of exit signal to process executing dirty
Fix dirty scheduler process priority
Fix alloc-util hard-debug
Silence debug warning when no beam jump table is used with dirty schedulers
Fix check_process_code() when NifExport is in use
Fix GC when NifExport is in use
Fix saving of original arguments when rescheduling via NifExport
Conflicts:
erts/emulator/beam/beam_bif_load.c
erts/emulator/beam/erl_nif.c
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Conflicts:
OTP_VERSION
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* maint:
Updated OTP version
Prepare release
Fix crash due to heap fragments left after GC
Conflicts:
OTP_VERSION
erts/emulator/beam/erl_gc.c
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Do not decode distribution messages as part of the GC operation.
Distribution messages containing maps may generate heap fragments.
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* maint:
Ensure correct mbuf_sz value in process structure
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* egil/erts/dont-copy-literals/OTP-13529:
erts: Refactor literal purge area arguments
erts: No need to literal opt message token
erts: Don't copy literals in enif_send
erts: Fix literal size calculation in check_process_code
erts: Remove the need for copying of literals
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* Literals are not copied between processes for messages or spawn
Increases performance of message sent and processes spawned when
literals are involved in messages or arguments.
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* margnus1/erts/fix-hipe-literal-gc/PR-1122/OTP-13777:
check_process_code: Sweep HiPE stack for literals
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Because check_process_code neglected checking the HiPE stack for
references to the literal area, such references would survive the purge
and subsequent deletion of a module and its literal area. These dangling
references would then cause incorrect behaviour or even hard crashes of
the VM.
By simply adding a scan of the HiPE stack to check_process_code and
erts_garbage_collect_literals, this problem is fixed.
In order to support full stack walks without deleting the graylimit
trap, a new stack walking interface function,
nstack_walk_init_sdesc_ignore_trap() was introduced.
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and replace with a nice else-if chain.
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The same bug was fixed for OTP 18 in cb62c989e59f0ec8556f9f1d4e9a45b
by provoking yet another GC.
But now in 19 we are ok with heap fragments
so just remove the asserts.
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