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2018-09-18Merge 'sverker/erts/fix-aborted-pending-connection-race/OTP-15296'Sverker Eriksson
2018-09-18erts: Refactor port dist_entry & conn_id into PRTSDSverker Eriksson
spelled out as "port specific data".
2018-09-18Consolidate distribution entry state transitionsSverker Eriksson
* Make connection_id part of the distribution handle as {ConnId, DistEntry} in order for BIFs to verify correct connection. * Make distribution handle opaque to net_kernel. * Remove some unsafe lockless reads of DistEntry.flags * Change state ERTS_DE_STATE_EXITING to be more of an internal state that prevents erts from enqueue, encode or schedule new data to be sent. Otherwise it should behave like ERTS_DE_STATE_CONNECTED.
2018-09-11erts: Fix "Prevent inconsistent node lists" fixSverker Eriksson
done in a31216200bdee2c04b3fb3ae5e26607674715c8a that could cause a new pending connection to be incorrectly aborted.
2018-09-05Prevent inconsistent node listsRickard Green
If net_kernel "forgets" to abort a connection (as it currently might), the garbage collection of a distribution entry could cause node lists to enter an inconsistent state.
2018-03-22Fix lock countingRickard Green
2018-03-21Implementation of true asynchronous signaling between processesRickard Green
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.
2018-03-02erts: Postpone idle DistEntry until abort is completedSverker Eriksson
2018-03-02erts: Refactor DistEntry.status flags into a stateSverker Eriksson
Just to simplify and get 4 distinctive states IDLE, PENDING, CONNECTED and EXITING. The old possible flag combos were: 0 PENDING CONNECTED CONNECTED|EXITING EXITING The two EXITING states did not serve any purpose other then as a slight optimization in monitor_node(_,false,_) to shortcut EXITING when there can be no monitors.
2018-03-02erts,kernel: Add erts_internal:get_dflags/0Sverker Eriksson
for kernel to ask erts about distribution flags and keep this info in one place.
2017-11-15erts: Put pending DistrEntry in separate listSverker Eriksson
2017-11-15erts: Keep magic ref to DistEntry in net_kernelSverker Eriksson
to make sure it's kept alive.
2017-11-15Allow DistEntries in ETSSverker Eriksson
2017-11-15erts: Transcode tuple fallbacksSverker Eriksson
When finalizing outgoing distribution messages we transcode them into using tuple fallbacks if the receiver does not support bitstrings and export-funs. This can only happen if the message was first encoded toward a pending connection when the receiver was unknown. It's an optimistic approach optmimized for modern beam nodes, that expect real bitstrings and funs (since <R13). Only erl_interface/jinterface lack this support.
2017-11-15Add optimistic DFLAG_DIST_HOPEFULLY for pending connectionsSverker Eriksson
to avoid tuple fallbacks for export funs and bitstrings. ToDo: Re-encode if receiver turn out to be erl_interface/jinterface.
2017-11-15erts: Introduce asynchronous auto-connectSverker Eriksson
2017-11-15erts TEST: Add missing ref to DistEntry from send contextSverker Eriksson
2017-11-15erts: Fix bug in DistEntry refc danceSverker Eriksson
to handle "lookup without refc++" correctly which was introduced in 4dcb2ae7810a507b701a30072b2f514cab7ebbdb. When decrementing refc to zero (in try_delete or prepare_try_delete) we must always wait thread progress to make sure no thread has done lookup without refc++ and is just about to do refc++ and thereby revive the DistEntry. That is, we wait for a potential other thread to either do refc++ or drop its pointer to the DistEntry. And if that other thread does refc++ (in erts_ref_dist_entry) it must also do the extra refc++ for the scheduled pending delete.
2017-08-28Merge branch 'rickard/dist/OTP-14459' into rickard/dist/master/OTP-14459Rickard Green
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
2017-08-28Optimize dist entry managementRickard Green
2017-08-28Support for distribution controller processesRickard Green
2017-07-17erts: Replace usage of all erts_smp prefixes to just ertsLukas Larsson
2017-07-17erts: Remove ERTS_SMP and USE_THREAD definesLukas Larsson
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
2017-07-06Allow toggling lock counting at runtimeJohn Högberg
The implementation is still hidden behind ERTS_ENABLE_LOCK_COUNT, and all categories are still enabled by default, but the actual counting can be toggled at will. OTP-13170
2017-07-04Change some dist-entry typesRickard Green
2017-05-04Update copyright yearRaimo Niskanen
2017-03-22Fix node_container_SUITERickard Green
2017-02-20Merge branch 'master' into sverker/enif_selectSverker Eriksson
Conflicts: erts/emulator/beam/erl_binary.h erts/emulator/beam/erl_monitors.c erts/emulator/beam/erl_nif.c erts/emulator/beam/global.h erts/emulator/test/nif_SUITE_data/nif_SUITE.c
2017-02-09erts: Add enif_monitor_process and enif_demonitor_processSverker Eriksson
2017-02-06Use magic refs for compiled match specsRickard Green
2017-02-06Implement magic referencesRickard Green
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.
2017-02-06Atomic reference count of binaries also in non-SMPRickard Green
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()
2016-11-17erts: Refactor crash dumping with cbprintfSverker Eriksson
Instead of passing around a file descriptor use a function pointer to facilitate more advanced backend write logic such as size limitation or compression.
2016-04-13Merge branch 'henrik/update-copyrightyear'Henrik Nord
* henrik/update-copyrightyear: update copyright-year
2016-04-07erts: Support 32-bit creation for external pid,port,refsSverker Eriksson
from future nodes.
2016-03-15update copyright-yearHenrik Nord
2016-02-24Merge branch 'master' into sverk/master/halt-INT_MINSverker Eriksson
2016-02-24erts: Change erl_exit into erts_exitSverker Eriksson
This is mostly a pure refactoring. Except for the buggy cases when calling erlang:halt() with a positive integer in the range -(INT_MIN+2) to -INT_MIN that got confused with ERTS_ABORT_EXIT, ERTS_DUMP_EXIT and ERTS_INTR_EXIT. Outcome OLD erl_exit(n, ) NEW erts_exit(n, ) ------- ------------------- ------------------------------------------- exit(Status) n = -Status <= 0 n = Status >= 0 crashdump+abort n > 0, ignore n n = ERTS_ERROR_EXIT < 0 The outcome of the old ERTS_ABORT_EXIT, ERTS_INTR_EXIT and ERTS_DUMP_EXIT are the same as before (even though their values have changed).
2015-12-15Merge branch 'lukas/erts/forker'Lukas Larsson
* lukas/erts/forker: (28 commits) erts: Never abort in the forked child erts: Mend ASSERT makro for erl_child_setup erts: Allow enomem failures in port_SUITE erts: iter_port sleep longer on freebsd erts: Allow one dangling fd if there is a gethost port erts: Only use forker StackAck on freebsd erts: It is not possible to exit the forker driver erts: Add forker StartAck for port start flowcontrol erts: Fix large open_port arg segfault for win32 erts: Fix memory leak at async open port kernel: Remove cmd server for unix os:cmd erts: Add testcase for huge port environment erts: Move os_pid to port hash to child setup erts: Handle all EINTR and EAGAIN cases in child setup erts: Make child_setup work with large environments erts: Fix forker driver ifdefs for win32 erts: Fix uds socket handling for os x erts: Fix dereferencing of unaligned integer for sparc erts: Flatten too long io vectors in uds write erts: Add fd count test for spawn_driver ... Conflicts: erts/emulator/beam/erl_node_tables.c erts/preloaded/src/erts_internal.erl
2015-12-15erts: Refactor out erts functions from hashLukas Larsson
2015-12-14Merge branch 'maint'Ingela Anderton Andin
2015-12-11erts: Fix correct node name for DTRACESverker Eriksson
broken by 949de78331b9c4ecb9.
2015-11-26Merge branch 'maint'Sverker Eriksson
2015-11-12Fragmented young heap generation and off_heap_message_queue optionRickard Green
* The youngest generation of the heap can now consist of multiple blocks. Heap fragments and message fragments are added to the youngest generation when needed without triggering a GC. After a GC the youngest generation is contained in one single block. * The off_heap_message_queue process flag has been added. When enabled all message data in the queue is kept off heap. When a message is selected from the queue, the message fragment (or heap fragment) containing the actual message is attached to the youngest generation. Messages stored off heap is not part of GC.
2015-11-10erts: Fix bug in setnode/2Sverker Eriksson
that could lead strange things to happen when renaming a node with a name that already exist in node and dist tables. Problem: erts_set_this_node() is a bit brutal and does not handle the case when an old remote node name is reused as the new local node name. Solution: Treat erts_this_node and erts_this_dist_entry as all the others with correct reference counting.
2015-11-02erts: Remove ERTS_PSD_DIST_ENTRYSverker Eriksson
Not needed as it is always set to erts_this_dist_entry (on net_kernel).
2015-06-24erts: Remove HALFWORD_HEAP definitionBjörn-Egil Dahlberg
2015-06-18Change license text to APLv2Bruce Yinhe
2015-06-10Merge branch 'rickard/delayed-delete-node/OTP-12802'Rickard Green
* rickard/delayed-delete-node/OTP-12802: Delayed node table GC
2015-06-10Merge branch 'rickard/node-table-read-lock/OTP-12777'Rickard Green
* rickard/node-table-read-lock/OTP-12777: Only read lock node table when reading info