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2012-07-31Merge branch 'rickard/dealloc/OTP-10162' into maintRickard Green
* rickard/dealloc/OTP-10162: Improve the enqueue operation of delayed dealloc Implement delayed aux work wake up
2012-07-31Implement delayed aux work wake upRickard Green
By using a delayed aux work wake up approach, a memory barrier can be omitted in the delayed dealloc enqueue operation. The amount of operations, on the potentially contended, wake up structure is also reduced.
2012-06-20Merge branch 'rickard/thr-prgr-use/OTP-10116' into maintRickard Green
* rickard/thr-prgr-use/OTP-10116: Fix faulty use of thread progress in handle_aux_work()
2012-06-18Fix faulty use of thread progress in handle_aux_work()Rickard Green
As an optimization old thread progress data was kept and used in handle_aux_work() in erl_process.c. This could cause memory to be deallocated at a later time than intended, which is quite harmless. This has, however, now been fixed.
2012-05-10Remove stale code for hybrid heap and incremental GCBjörn Gustavsson
The hybrid heap emulator was last working in the non-SMP R11B run-time system. When the constant pools were introduced in R12B, the hybrid heap emulator was not updated to handle them. At this point, the harm from reduced readability of the code is greater than any potential usefulness of keeping the code.
2012-04-25Merge branch 'rickard/sched-busy-wait/OTP-10044' into maint-r15Erlang/OTP
* rickard/sched-busy-wait/OTP-10044: Add switch controlling scheduler busy wait Conflicts: erts/emulator/beam/erl_process.c erts/emulator/beam/erl_process.h
2012-04-23Merge branch 'rickard/sched-wakeup-other/OTP-10033' into ↵Rickard Green
rickard/sched-wakeup-other-r15b01/OTP-10033 Conflicts: erts/emulator/beam/erl_process.c erts/vsn.mk
2012-04-23Add switch controlling scheduler busy waitRickard Green
2012-04-23Implement proposal for new scheduler wakeup strategyRickard Green
2012-03-22erl_process.c: Fix probe for process exitBjörn Gustavsson
2012-03-22Ifdef all dynamic trace codePatrik Nyblom
2012-03-22Change to more specific configure options for dtracePatrik Nyblom
2012-03-22Add user tag spreading functionality to VM and use in filePatrik Nyblom
User tags in a dynamic trace enabled VM are spread throughout the system in the same way as seq_trace tokens. This is used by the file module and various other modules to get hold of the tag from the user process without changing the protocol.
2012-03-22Add DTrace support for OS X, Solaris, and Linux (via SystemTap), 3/4Scott Lystig Fritchie
Add probes to the virtual machine, except (mostly) the efile_drv.c driver and other file I/O-related source files.
2012-03-21erts: Implement erl_haltRaimo Niskanen
2012-02-20Merge branch 'rickard/barriers/OTP-9922' into maintRickard Green
* rickard/barriers/OTP-9922: Reduce thread progress read operations in handle_aux_work() Misc memory barrier fixes
2012-02-19Reduce thread progress read operations in handle_aux_work()Rickard Green
2012-02-19Misc memory barrier fixesRickard Green
- Document barrier semantics - Introduce ddrb suffix on atomic ops - Barrier macros for both non-SMP and SMP case - Make the thread progress API a bit more intuitive
2012-02-16Merge branch 'jz/erts-remove-unused-var' into maintHenrik Nord
* jz/erts-remove-unused-var: erts: Remove unused variable OTP-9926
2012-02-07Merge branch 'dgud/sched-work-time/OTP-9858' into maintPatrik Nyblom
* dgud/sched-work-time/OTP-9858: emulator: Document and test scheduler_wall_time Implement statistics(scheduler_wall_time)
2012-01-26Implement statistics(scheduler_wall_time)Rickard Green
2011-12-21erts: Remove unused variableJovi Zhang
Remove unused variable erts_system_monitor_msg_queue_len
2011-12-20Remove bad assertRickard Green
It is possible also in non-SMP case: 1. The process receives an exit signal and is set in status exiting and inserted into the run queue. 2. The distribution port exits before the process has been selected for execution and cannot remove the link half on the process since it is in status exiting. 3. Process is selected for execution and when removing this link half the distribution channel is gone!
2011-12-08Merge branch 'rickard/generic-thr-queue/OTP-9632'Rickard Green
* rickard/generic-thr-queue/OTP-9632: Give elements of lock-free queues some time to be deallocated Fix cleanup of elements in lock-free queues
2011-12-07Fix cleanup of elements in lock-free queuesRickard Green
2011-12-05Merge branch 'rickard/generic-thr-queue/OTP-9632'Rickard Green
* rickard/generic-thr-queue/OTP-9632: Fix handle_async_ready_clean()
2011-12-05Fix handle_async_ready_clean()Rickard Green
2011-12-01Merge branch 'rickard/rm-common-runq/OTP-9727'Rickard Green
* rickard/rm-common-runq/OTP-9727: Remove common run-queue in SMP case Fix scheduler suspend bug Conflicts: erts/emulator/beam/erl_init.c
2011-12-01Remove common run-queue in SMP caseRickard Green
The common run-queue implementation is removed since it is unused, untested, undocumented, unsupported, and only complicates the code. A spinlock used by the run-queue management sometimes got heavily contended. This code has now been rewritten, and the spinlock has been removed.
2011-12-01Fix scheduler suspend bugRickard Green
Calls to erlang:system_flag(schedulers_online, N) and/or erlang:system_flag(multi_scheduling, block|unblock) could cause internal data used by this functionality to get into an inconsistent state. When this happened various problems occurred. This bug was quite hard to trigger, so hopefully no-one has been effected by it.
2011-11-29erl_process.c: Remove the redundant variable 'processes_busy'Björn Gustavsson
There is a static variable called 'processes_busy' in erl_process.c, which will be incremented but never used. To confuse things, there is also a global variable with the same name, but it it is only defined and used if BM_COUNTERS is defined. In erl_process.c, the global version of 'processes_busy' will be seen and incremented if BM_COUNTERS is defined. Remove the static version of 'processes_busy' in erl_process.c, but keep the global version if BM_COUNTERS is defined. Noticed-by: Jovi Zhang
2011-11-18Merge branch 'sverk/hipe-without-fpe/OTP-9724'Sverker Eriksson
* sverk/hipe-without-fpe/OTP-9724: otp_build: Disable FPE by default on Linux stdlib: Make sure qlc_SUITE:otp_6964 restores backtrace_depth erts: Add test for inf/NaN intermediate float results hipe,erts: Allow hipe without floating point exceptions hipe: Fix bug in hipe_rtl_lcm:calc_killed_expr_bb erts: Rename macros used by float instructions without FPE
2011-11-18Merge branch 'rickard/sched-compact-load/OTP-9695'Rickard Green
* rickard/sched-compact-load/OTP-9695: Add switch that can disable scheduler compaction of load
2011-11-17hipe,erts: Allow hipe without floating point exceptionsSverker Eriksson
2011-11-15Add switch that can disable scheduler compaction of loadRickard Green
2011-11-13Merge branch 'rickard/generic-thr-queue/OTP-9632'Rickard Green
* rickard/generic-thr-queue/OTP-9632: Use generic lock-free queue for async threads Use generic lock-free queue for misc aux work Implement generic lock-free queue
2011-11-13Merge branch 'rickard/thr-progress-block/OTP-9631'Rickard Green
* rickard/thr-progress-block/OTP-9631: Replace system block with thread progress block
2011-11-13Merge branch 'rickard/alloc-opt/OTP-7775'Rickard Green
* rickard/alloc-opt/OTP-7775: Optimize memory allocation Conflicts: erts/aclocal.m4 erts/emulator/hipe/hipe_bif_list.m4 erts/preloaded/ebin/erl_prim_loader.beam erts/preloaded/ebin/erlang.beam erts/preloaded/ebin/init.beam erts/preloaded/ebin/otp_ring0.beam erts/preloaded/ebin/prim_file.beam erts/preloaded/ebin/prim_inet.beam erts/preloaded/ebin/prim_zip.beam erts/preloaded/ebin/zlib.beam
2011-11-13Use generic lock-free queue for async threadsRickard Green
Queues used for communication between async threads and scheduler threads have been replaced with lock-free queues. Drivers using the driver_async functionality are not automatically locked to the system anymore, and can be unloaded as any dynamically linked in driver. Scheduling of ready async jobs is now also interleaved in between other jobs. Previously all ready async jobs was performed at once.
2011-11-13Use generic lock-free queue for misc aux workRickard Green
2011-11-13Replace system block with thread progress blockRickard Green
The ERTS internal system block functionality has been replaced by new functionality for blocking the system. The old system block functionality had contention issues and complexity issues. The new functionality piggy-backs on thread progress tracking functionality needed by newly introduced lock-free synchronization in the runtime system. When the functionality for blocking the system isn't used there is more or less no overhead at all. This since the functionality for tracking thread progress is there and needed anyway.
2011-11-13Optimize memory allocationRickard Green
A number of memory allocation optimizations have been implemented. Most optimizations reduce contention caused by synchronization between threads during allocation and deallocation of memory. Most notably: * Synchronization of memory management in scheduler specific allocator instances has been rewritten to use lock-free synchronization. * Synchronization of memory management in scheduler specific pre-allocators has been rewritten to use lock-free synchronization. * The 'mseg_alloc' memory segment allocator now use scheduler specific instances instead of one instance. Apart from reducing contention this also ensures that memory allocators always create memory segments on the local NUMA node on a NUMA system.
2011-10-14Merge branch 'rickard/atomics-api/OTP-9014' and OTP_R14B04Rickard Green
Conflicts: erts/aclocal.m4 erts/emulator/beam/erl_db.c erts/emulator/sys/win32/sys.c erts/include/internal/ethread_header_config.h.in
2011-09-26Merge branch 'dev' into majorLars Thorsen
* dev: [erl_docgen] Missing header level in PDF bookmarks menu Fixed version, release notes and appup in prep for release. Fix lost wakeup of scheduler when enqueuing auxiliary work
2011-09-24Merge branch 'rickard/aux-work-bug/OTP-9567' into devRickard Green
* rickard/aux-work-bug/OTP-9567: Fix lost wakeup of scheduler when enqueuing auxiliary work
2011-09-22Fix lost wakeup of scheduler when enqueuing auxiliary workRickard Green
When auxiliary work was enqueued on a scheduler, the wakeup of the scheduler in order to handle this work could be lost. Wakeups in order to handle ordinary work were not effected by this bug. The bug only effected runtime systems with SMP support as follows: * Deallocation of some ETS data structures could be delayed. * On Linux systems not using the NPTL thread library (typically ancient systems with kernel versions prior to 2.6) and Windows systems, the {Port, {exit_status, Status}} message from a terminating port program could be delayed. That is, it only effected port programs which had been started by passing exit_status as an option to open_port/2.
2011-09-13Merge branch 'dev' into majorBjörn-Egil Dahlberg
* dev: Make sure we have a run_queue
2011-09-12Make sure we have a run_queueBjörn-Egil Dahlberg
* In rare cases we could have no run_queue in schedule misc ops
2011-09-06BEAM: Unify allocation of X and float registersBjörn Gustavsson
In the half-word emulator, smp emulator, and non-smp emulator the X register and float register arrays were allocated in different ways. Always allocate the registers and store the pointers to the allocated register arrays in the scheduler data.
2011-06-14Use new atomic API in runtime systemRickard Green
All uses of the old deprecated atomic API in the runtime system have been replaced with the use of the new atomic API. In a lot of places this change imply a relaxation of memory barriers used.