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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The ERTS internal system block functionality has been replaced by new functionality for blocking the system.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
2011-09-06Changes inspired by running cppcheck(1)Christian von Roques
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.
2011-05-20Update copyright yearsBjörn-Egil Dahlberg
2011-05-13Merge branch 'rickard/barriers/OTP-9281' into devRickard Green
* rickard/barriers/OTP-9281: Silence warnings Fix build with hipe on amd64 Reduce number of atomic ops Use 32-bit atomic for port snapshot Remove pointless erts_ports_alive variable Ensure quick break Ensure that all rehashing information are seen when done Ensure that stack updates are seen when stack is released Add needed barriers for write_concurrency tables Homogenize memory barriers on atomics
2011-05-13Silence warningsRickard Green
2011-05-13Ensure quick breakRickard Green
Make sure that we don't have to wait in poll before break handling is done.
2011-05-09Expand the use of high memory allocation in halfword emulatorSverker Eriksson
Also add 'low' field in system_info(allocator) SHORT_LIVED is still in low memory
2011-03-16erts_printf %be to print integers of size EtermSverker Eriksson
Existing %bp to print pointer size integers does not work in halfword emulator to print Eterm size integers.
2011-03-10Merge branch 'sverker/valgrind-new-suppressions' into devSverker Eriksson
* sverker/valgrind-new-suppressions: Make halfword emulator with valgrind target allocate low memory Add erts_alloc_permanent_cache_aligned to supress valgrind
2011-03-09Make halfword emulator with valgrind target allocate low memorySverker Eriksson
Limit ERTS_MSEG_FAKE_SEGMENTS (that is otherwise set for valgrind target) to not apply to low memory needed by halfword emulator. This will reduce the fault detection capability of valgrind for low memory. Also correct a bug in the initial mmap and make sure the returned memory region does not reach into high memory.
2011-03-08The emulator could get into a state where it didn't check for I/O.Rickard Green
2011-02-25Merge branch 'rickard/poll-wake/OTP-9019' into devRickard Green
* rickard/poll-wake/OTP-9019: Simplify erts_poll_wait() wakeup logic
2011-02-25Simplify erts_poll_wait() wakeup logicRickard Green
2011-02-03HALFWORD Make system_info mseg_alloc report both low/high memSverker Eriksson
2011-02-03HALFWORD Make more allocators use high mem (binary, fixed and driver)Sverker Eriksson
2011-02-03HALFWORD ETS 32-bit arch fixes and other cleanupsSverker Eriksson
2011-02-03HALFWORD first stab at high mem allocSverker Eriksson
2011-02-03HALFWORD ETS relative termsSverker Eriksson
In halfword emulator, make ETS use a variant of the internal term format that uses relative offsets instead of absolute pointers. This will allow storage in high memory (>4G). Preprocessor macros (like list_val_rel(TERM,BASE)) are used to make normal (fullword) emulator almost completely unchanged while still reusing most of the code.
2010-12-20Refactor timer interfaceBjörn-Egil Dahlberg
2010-12-15Use new atomic types in emulatorRickard Green
2010-11-30Convert filenames read on MacOSX to canonical formPatrik Nyblom
2010-11-30Make Unicode filenames work on WindowsPatrik Nyblom
2010-11-29Teach filename to accept raw data and add filename enc option to emuPatrik Nyblom
2010-11-29Add bifs to translate between erlang filenames and native encodingPatrik Nyblom
2010-09-07Merge branch 'mk/net-dragonfly-bsd-patches' into devBjörn Gustavsson
* mk/net-dragonfly-bsd-patches: Remove unused variables Use proper install method Add support for DragonFly BSD Add support for NetBSD
2010-08-20Fix race in erts_poll()Rickard Green
A race condition in erts_poll() could cause delay of poll for I/O.
2010-08-13Add support for NetBSDMartti Kuparinen
These are the current NetBSD pkgsrc patches.
2010-06-01OTP-8658 Add missing memory barriers in erts_poll()Rickard Green
Missing memory barriers in erts_poll() could cause the runtime system to hang indefinitely.
2010-05-15fix livelock in erts_poll_info_kp()Mikael Pettersson
erts_poll_info_kp() [defined in erts/emulator/sys/common/erl_poll.c via some name-mangling trickery] contains a code path that can end up in an infinite loop, causing a livelock. There is a block of code inside #if ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE that is supposed to iterate over a linked list of ErtsPollSetUpdateRequestsBlocks and update two variables based on the sizes of these blocks. The bug is that the loop forgets to advance the list pointer to the next element, so if the loop is entered at all (the initial list pointer is non-NULL), the thread falls into an infinite loop. This patch, against R13B03 but applies fine to today's git, fixes the bug by adding a statement to advance the list pointer in the loop. All other loops over this list appear to be correct. Thanks to Chetan Ahuja for the original report of a livelock problem in erts_poll_info_kp().
2010-04-28OTP-8591 Race in mseg cashe on non-SMP with async threadsSverker Eriksson
Fix memory management bug causing crash of non-SMP emulator with async threads enabled. The bug did first appear in R13B03.
2010-03-22Merge branch 'pan/otp_8332_halfword' into devErlang/OTP
* pan/otp_8332_halfword: Teach testcase in driver_suite the new prototype for driver_async wx: Correct usage of driver callbacks from wx thread Adopt the new (R13B04) Nif functionality to the halfword codebase Support monitoring and demonitoring from driver threads Fix further test-suite problems Correct the VM to work for more test suites Teach {wordsize,internal|external} to system_info/1 Make tracing and distribution work Turn on instruction packing in the loader and virtual machine Add the BeamInstr data type for loaded BEAM code Fix the BEAM dissambler for the half-word emulator Store pointers to heap data in 32-bit words Add a custom mmap wrapper to force heaps into the lower address range Fit all heap data into the 32-bit address range
2010-03-10Fix further test-suite problemsPatrik Nyblom
Fix safe_mul in the loader, which caused failures in the bit syntax test cases. Fix yet another Uint in erl_alloc.h (ERTS_CACHE_LINE_SIZE) causing segmentation fault when we have many schedulers (why only in that situation?). Clean up erl_mseg (remove old code for the Linux 32-bit mmap flag). While at it, also remove compilation warnings.
2010-03-10Store pointers to heap data in 32-bit wordsPatrik Nyblom
Store Erlang terms in 32-bit entities on the heap, expanding the pointers to 64-bit when needed. This works because all terms are stored on addresses in the 32-bit address range (the 32 most significant bits of pointers to term data are always 0). Introduce a new datatype called UWord (along with its companion SWord), which is an integer having the exact same size as the machine word (a void *), but might be larger than Eterm/Uint. Store code as machine words, as the instructions are pointers to executable code which might reside outside the 32-bit address range. Continuation pointers are stored on the 32-bit stack and hence must point to addresses in the low range, which means that loaded beam code much be placed in the low 32-bit address range (but, as said earlier, the instructions themselves are full words). No Erlang term data can be stored on C stacks (enforced by an earlier commit). This version gives a prompt, but test cases still fail (and dump core). The loader (and emulator loop) has instruction packing disabled. The main issues has been in rewriting loader and actual virtual machine. Subsystems (like distribution) does not work yet.
2010-03-10Add a custom mmap wrapper to force heaps into the lower address rangePatrik Nyblom
The free list is still rudimentary for the mmap wrapper and a better implementation will be needed for production quality.
2010-03-10Fit all heap data into the 32-bit address rangePatrik Nyblom
This is the first step in the implementation of the half-word emulator, a 64-bit emulator where all pointers to heap data will be stored in 32-bit words. Code specific for this emulator variant is conditionally compiled when the HALFWORD_HEAP define has a non-zero value. First force all pointers to heap data to fall into a single 32-bit range, but still store them in 64-bit words. Temporary term data stored on C stack is moved into scheduler specific storage (allocated as heaps) and macros are added to make this happen only in emulators where this is needed. For a vanilla VM the temporary terms are still stored on the C stack.
2010-02-08OTP-8412 Fixed numerous compiler warnings generated by gcc 4.4.1 andRickard Green
tile-cc 2.0.1.78377 when compiling the runtime system.
2009-11-20The R13B03 release.OTP_R13B03Erlang/OTP