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If no message/signal is sent (to same destination)
then monitor signal is flushed when process is scheduled out.
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This commit replaces the old memory instrumentation with a new
implementation that scans carriers instead of wrapping
erts_alloc/erts_free. The old implementation could not extract
information without halting the emulator, had considerable runtime
overhead, and the memory maps it produced were noisy and lacked
critical information.
Since the new implementation walks through existing data structures
there's no longer a need to start the emulator with special flags to
get information about carrier utilization/fragmentation. Memory
fragmentation is also easier to diagnose as it's presented on a
per-carrier basis which eliminates the need to account for "holes"
between mmap segments.
To help track allocations, each allocation can now be tagged with
what it is and who allocated it at the cost of one extra word per
allocation. This is controlled on a per-allocator basis with the
+M<S>atags option, and is enabled by default for binary_alloc and
driver_alloc (which is also used by NIFs).
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This may be of interest in crash dumps and allows the upcoming
allocation tagging feature to track allocations on a per-NIF basis.
Note that this is only updated when user code calls a NIF; it's not
altered when the emulator calls NIFs during code upgrades or
tracing.
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* rickard/process_info/OTP-14966:
New process_info() implementation using signals
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* john/erts/bwt-wt-dirty-schedulers/OTP-14959:
Add +sbwt/+swt analogues for dirty schedulers
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Sharing these settings for all schedulers can degrade performance,
so it makes sense to be able to configure them separately.
This also changes the default busy-wait time to "short" for both
kinds of dirty schedulers.
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OTP-14899
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Communication between Erlang processes has conceptually always been
performed through asynchronous signaling. The runtime system
implementation has however previously preformed most operation
synchronously. In a system with only one true thread of execution, this
is not problematic (often the opposite). In a system with multiple threads
of execution (as current runtime system implementation with SMP support)
it becomes problematic. This since it often involves locking of structures
when updating them which in turn cause resource contention. Utilizing
true asynchronous communication often avoids these resource contention
issues.
The case that triggered this change was contention on the link lock due
to frequent updates of the monitor trees during communication with a
frequently used server. The signal order delivery guarantees of the
language makes it hard to change the implementation of only some signals
to use true asynchronous signaling. Therefore the implementations
of (almost) all signals have been changed.
Currently the following signals have been implemented as true
asynchronous signals:
- Message signals
- Exit signals
- Monitor signals
- Demonitor signals
- Monitor triggered signals (DOWN, CHANGE, etc)
- Link signals
- Unlink signals
- Group leader signals
All of the above already defined as asynchronous signals in the
language. The implementation of messages signals was quite
asynchronous to begin with, but had quite strict delivery constraints
due to the ordering guarantees of signals between a pair of processes.
The previously used message queue partitioned into two halves has been
replaced by a more general signal queue partitioned into three parts
that service all kinds of signals. More details regarding the signal
queue can be found in comments in the erl_proc_sig_queue.h file.
The monitor and link implementations have also been completely replaced
in order to fit the new asynchronous signaling implementation as good
as possible. More details regarding the new monitor and link
implementations can be found in the erl_monitor_link.h file.
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* rickard/remove-approx-started/OTP-14975:
Remove process start time for crash dumps
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Bug introduced in commit fbb10ebc4a37555c7ea7f99e14286d862993976a
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Otherwise on targets which have small data area with short addressing
like on PowerPC ther will be linking errors due to the mismatch of
declaration/usage and definition.
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It is not longer relevant when using the poll thread
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* lukas/erts/remove-dirty-scheduler-defines/OTP-14613:
erts: Remove possibility to disable dirty schedulers
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Conflicts:
erts/emulator/sys/unix/sys.c
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Conflicts:
erts/emulator/beam/bif.c
erts/emulator/beam/dist.c
erts/emulator/beam/dist.h
erts/emulator/beam/erl_bif_info.c
erts/emulator/beam/erl_node_tables.c
erts/emulator/beam/erl_node_tables.h
erts/emulator/beam/external.c
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This refactor was done using the unifdef tool like this:
for file in $(find erts/ -name *.[ch]); do unifdef -t -f defile -o $file $file; done
where defile contained:
#define ERTS_SMP 1
#define USE_THREADS 1
#define DDLL_SMP 1
#define ERTS_HAVE_SMP_EMU 1
#define SMP 1
#define ERL_BITS_REENTRANT 1
#define ERTS_USE_ASYNC_READY_Q 1
#define FDBLOCK 1
#undef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
#define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 0
#define ERTS_POLL_USE_WAKEUP_PIPE 1
#define ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE 1
#undef ERTS_HAVE_PLAIN_EMU
#undef ERTS_SIGNAL_STATE
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* rickard/purge-hibernated-19:
Do not GC hibernated process from other processes
Fix check_process_code() on hibernated process
Conflicts:
erts/emulator/beam/beam_bif_load.c
erts/emulator/beam/erl_process.c
erts/emulator/beam/erl_process.h
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* rickard/purge-hibernated:
Do not GC hibernated process from other processes
Fix check_process_code() on hibernated process
Conflicts:
erts/emulator/beam/beam_bif_load.c
erts/emulator/beam/erl_gc.c
erts/emulator/beam/erl_process.h
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OTP-14152
* rickard/ds-runqs:
Make statistics/1 aware of dirty run-queues and tasks
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erts: Remove old unused functions
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The functions have been found using: https://github.com/caolanm/callcatcher
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OTP-14380
* rickard/ds-stack-size:
Suggested stack size options for dirty schedulers
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* rickard/sched_type_tests:
Fix dirty scheduler type tests
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Old test for dirty schedulers didn't work with Visual C++
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* sverker/ets-table-identifiers:
observer: Polish crashdump viewer for ETS
observer: Polish Table Viewer tab
stdlib: Remove ets_SUITE:memory_check_summary
erts: Improve reduction count during table cleanup
erts: Cleanup table status bits
erts: Remove now redundant 'id' from DbTableCommon
erts: Remove meta_main_tab
erts: Pass tid argument down to trapping functions
erts: Print table id as ref in crashdump and break menu
erts: Replace meta_pid_to{_fixed}_tab with linked lists
erts: Correct erl_rbtree comments about yielding
erts: Add ERTS_RBT_YIELD_STAT_INIT to erl_rbtree
Fix node_container_SUITE
list_to_ref/1
Implement ets:all() using scheduler specific data
Rename fixation count in ets table to avoid confusion
Introduce references as table identifiers
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