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Conflicts:
erts/vsn.mk
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The status of a process was unnecessarily set to waiting before
the process was enqueued in a run queue. This bug was harmless
up until OTP-R14B01. In OTP-R14B02 erlang:hibernate/3 was fixed
(OTP-9125). After the introduction of OTP-9125, the previously
harmless process status bug sometimes caused erroneous badarg
exceptions from process_info().
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* ta/erts-unused-vars:
erts: Remove unused variables
OTP-9205
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* pan/system_info_procs_crash/OTP-9140:
Make erts_printf %T not recurse on C stack
Corrected fd_driver and cleaned up some really old code in win32/sys.[ch]
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* sverker/valgrind-new-suppressions:
Make halfword emulator with valgrind target allocate low memory
Add erts_alloc_permanent_cache_aligned to supress valgrind
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Ease the valgrind supression of memory that are permanently
allocated and then aligned up to cache line.
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* pan/halfword-tmp-heap-fixes/OTP-8332:
Fix assymetric (Un)UseTmpHeap in erl_process.c
Conflicts:
erts/emulator/beam/beam_emu.c
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Also added ASSERTion in beam_emu.c that the tmp-heap-counter in 0.
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* egil/timer-wheel-min-time/OTP-8990:
Teach timer-wheel slots to use double linked lists
Remove timer-thread implementation
Refactor timer interface
Teach timer-wheel to keep min time
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* rickard/ets-tab-delete/OTP-8999:
Safe deallocation of ETS-table structures
Fix rwlock resource leak when hitting system limit
Conflicts:
erts/emulator/beam/erl_process.h
erts/emulator/beam/erl_process.c
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Ensure that all threads potentially accessing an ETS-table have dropped
all references to the table before deallocating it.
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* rickard/load-balance-wrap/OTP-8950:
Prevent wrapping of values used during load balancing
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Some integer values used during load balancing could
under rare circumstances wrap causing a load unbalance
between schedulers.
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* rickard/cpu-groups/OTP-8861:
Generalize reader groups
Move cpu topology functionality into erl_cpu_topology.[ch]
Do not use more reader groups for schedulers than schedulers
Conflicts:
erts/emulator/beam/erl_init.c
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Reader groups have been generalized to cpu groups which can be
used for implementing reader groups, but also for implementing
other functionality in the future.
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* rickard/sys_schedule_debug:
Verify that no outstanding I/O exist when checking for I/O in debug build
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* rickard/sched-misc/OTP-8932:
Fix erts_schedule_misc_op() so it can be called from arbitrary threads
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Tracing to port could cause an emulator crash when unloading the
trace driver.
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The scheduler wakeup threshold is now possible to adjust at system boot.
For more information see the `+swt' command line argument of `erl'.
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Lower the scheduler wakeup threshold since schedulers aren't spuriously
woken as before (since commit 59ee2a593090e7d53c97ceba63cbd300d1b9657e).
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Calling erlang:system_info(update_cpu_info) on platforms where no
CPU topology was found could result in a crash if other CPU
information had changed. This bug was introduced in the 'dev'
branch before R14B (commit 1b273b618002d65159453fdfb9520a9476e4423a).
That is, the bug has never been seen in a released runtime system.
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* rickard/cpu-info-unbind/8765:
Fix erroneous error reports about unbind failure
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On platforms where binding of schedulers is not supported, numerous error
reports on the form "Scheduler <N> failed to unbind from cpu -1: enotsup"
were erroneously issued. This bug was introduced in the 'dev' branch
before R14B (commit 1b273b618002d65159453fdfb9520a9476e4423a). That is,
the bug has never been seen in a released runtime system.
Reported-By: Tuncer Ayaz
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* egil/R14A/binary-gc-wrap/OTP-8730:
Increase vheap counter to Uint64
Fix wrapping in next vheap calculation
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* rickard/cpu-info/OTP-8765:
Initialize environment functionality after thread lib
Fix faulty assertions
Implement automatic detection of CPU topology on Windows
Make it possible to reread and update detected CPU information
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Calling erlang:system_info/1 with the new argument 'update_cpu_info'
will make the runtime system reread and update the internally stored
CPU information. For more information see the documentation of
erlang:system_info(update_cpu_info).
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This will reduce the risk of integer wrapping in bin vheap counting.
The vheap size series will now use the golden ratio instead of doubling
and fibonacci sequences.
OTP #8730
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For a short period of time no_empty_run_queues may have
been increased twice for a specific run queue. Two
assertions did not take this into account.
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* rickard/ethread-rewrite/OTP-8544:
Rewrite ethread library
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Large parts of the ethread library have been rewritten. The
ethread library is an Erlang runtime system internal, portable
thread library used by the runtime system itself.
Most notable improvement is a reader optimized rwlock
implementation which dramatically improve the performance of
read-lock/read-unlock operations on multi processor systems by
avoiding ping-ponging of the rwlock cache lines. The reader
optimized rwlock implementation is used by miscellaneous
rwlocks in the runtime system that are known to be read-locked
frequently, and can be enabled on ETS tables by passing the
`{read_concurrency, true}' option upon table creation. See the
documentation of `ets:new/2' for more information.
The ethread library can now also use the libatomic_ops library
for atomic memory accesses. This makes it possible for the
Erlang runtime system to utilize optimized atomic operations
on more platforms than before. Use the
`--with-libatomic_ops=PATH' configure command line argument
when specifying where the libatomic_ops installation is
located. The libatomic_ops library can be downloaded from:
http://www.hpl.hp.com/research/linux/atomic_ops/
The changed API of the ethread library has also caused
modifications in the Erlang runtime system. Preparations for
the to come "delayed deallocation" feature has also been done
since it depends on the ethread library.
Note: When building for x86, the ethread library will now use
instructions that first appeared on the pentium 4 processor. If
you want the runtime system to be compatible with older
processors (back to 486) you need to pass the
`--enable-ethread-pre-pentium4-compatibility' configure command
line argument when configuring the system.
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Merging the three off-heap lists (binaries, funs and externals) into
one list. This reduces memory consumption by two words (pointers) per
ETS object.
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A user defined CPU topology set via a call to <seealso
marker="erlang#system_flag_cpu_topology">erlang:system_flag(cpu_topology,
CPUTopology)</seealso> was not properly verified, and could in worst case
cause an emulator crash. The emulator crash could only occur when a user
defined CPU topology already existed and was redefined.
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call_time trace will use instruction pointers instead of
breakpoint data pointers. More costly lookup but the bdt
structure might be deallocated, we do not want that.
Remove unnecessary pattern lock.
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erlang:system_info(multi_scheduling) sometimes erroneously returned enabled
when it should have returned blocked.
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Alignment of scheduler data and run queues were adjusted.
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