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Do not allocate a new map when the value is the same
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* lukas/erts/seq_trace_fix_token_clear/ERL-602/OTP-15038:
erts: Fix seq_trace to not clear token for system messages
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A lot of erts internal messages used behind APIs to create
non-blocking calls, e.g. port_command, would cause the seq_trace
token to be cleared from the caller when it should not.
This commit fixes that and adds asserts that makes sure
that all messages sent have to correct token set.
Fixes: ERL-602
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* lukas/erts/fix_udp_realloc_bug:
erts: Limit the automatic max buffer for UDP to 2^16
erts: Free udp buffer when getting EAGAIN
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* lukas/erts/etoomanyrefs_forker/OTP-15210:
erts: Handle EMFILE errors in forker_driver for write
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erl_alloc: align ErtsAllocatorState_t
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Fix spec for erl_syntax_lib:analyze_type_application/1
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The zipdoc file has to have the same contents as zipdoc.zip
otherwise testcases fail. This was broken in 37c11cda19bd90.
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There is no reason to have a larger buffer than this as
the recvmsg call will never return more data.
OTP-15206
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Before this change, if a write to the uds failed due to
EMFILE to ETOOMANYREFS the entire vm would crash. This
change makes it so that an SIGCHLD is simulated to that
the error is propagated to the user instead of terminating
the VM.
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* lukas/erts/win_break_poll_thread_fix/OTP-15205:
erts: Fix bug where break would not trigger on windows
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RaimoNiskanen/raimo/can_not-should-mostly-be-cannot
OTP-14282
'can not' should mostly be 'cannot'
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I did not find any legitimate use of "can not", however skipped
changing e.g RFCs archived in the source tree.
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After this whitespace modification there should be no "can not"s
separated by a newline in the entire OTP repository, so to find
them all a simple git grep will do just fine.
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This patch optimizes map operations to not allocate new maps
when the key is being replaced by the exact same value in memory.
Imagine this very common idiom:
Map#{key := compute_new_value(Value, Condition)}
where:
compute_new_x(X, true) -> X + 1;
compute_new_x(X, false) -> X;
In many cases, we are not changing the value in `Key`, however
the code prior to this patch would still allocate a new array
for the map values. This optimization changes this.
The cost of optimization is minimum, as in the worst case scenario
it only adds a pointer comparison and boolean check. The major benefit
is reducing the GC pressure by avoiding allocating data.
Next we list the operations we have changed alongside the benchmark
results. The benchmarks basically create a map and perform the same
operations, roughly 20000 times, once replacing the key with the same
value, and another with a different value.
* Map#{Key := Value}
For a map with 4 keys, replacing the fourth key 20000 times went from
718us to 539us.
For a map with 8 keys, replacing the fourth key 20000 times went from
976us to 555us.
* maps:update/3
For a map with 4 keys, replacing the fourth key 20000 times went from
673us to 575us.
For a map with 8 keys, replacing the fourth key 20000 times went from
827us to 585us.
* maps:put/3
For a map with 4 keys, replacing the fourth key 20000 times went from
763us to 553us.
For a map with 8 keys, replacing the fourth key 20000 times went from
788us to 561us.
Note that we have ported some optimizations found in maps:update/3
to maps:put/3 while creating this patch.
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Refactor maps.erl
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* peterdmv/ssl/version_downgrade_protection/OTP-15189:
ssl: Implement downgrade protection mechanism (TLS 1.3)
Change-Id: I29a281c1278509608fdea9b0346ad91c62f886a8
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* maint:
Fix bad merge of otp_versions.table
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* maint:
Fix typo in xmerl_scan:string/1
Updated OTP version
Prepare release
ssl: Engine key trumps certfile option
inets: Prepare for release
inets: Improve error handling
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* maint-20:
Updated OTP version
Prepare release
ssl: Engine key trumps certfile option
inets: Prepare for release
inets: Improve error handling
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This only touches functions that are not further manually enhanced in
erl_bif_types. The hope is that this will allow dialyzer to discover
more issues in code using maps.
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Fix typo in xmerl_scan:string/1
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* peterdmv/ssl/version_extension_updates/OTP-15059:
ssl: Fix handling of TLS record versions
ssl: Update hello state (TLS 1.3)
ssl: Implement 'supported_versions' extension
ssl: Sort supported versions in handle_options
ssl: Add experimental version 'tlsv1.3'
Change-Id: I071d24242103cc066c5ee8154effc5ee01b04703
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fix type spec of mnesia:change_config
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maps:new/0 is no longer a BIF
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'ingela/inets/error-handling-eisdir-mod-get/ERIERL-207/OTP-15192' into maint-20
* ingela/inets/error-handling-eisdir-mod-get/ERIERL-207/OTP-15192:
inets: Prepare for release
inets: Improve error handling
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* sverker/crash-dump-crash-literals/OTP-15181:
erts: Fix bug in crash dump generation
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* sverker/ic/encode-long-buffer-overflow/OTP-15179:
ic: Tweak tests to provoke more outbuf reallocations
ic: Fix memory leak in oe_ei_decode_wstring
ic: Fix correct external format sizes
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* ingela/ssl/engine-vs-certfile/ERLERL-211/OTP-15193:
ssl: Engine key trumps certfile option
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* ingela/maint-20/chipher-suite-handling/OTP-15178:
ssl: Prepare for release
ssl: Fix test case to only check relevant info for the test
ssl: Correct connection_information on ECC-curves
ssl: No cipher suite sign restriction in TLS-1.2
ssl: Add psk as anonymous key exchange in ssl_handshake:select_hashsign/5
ssl: anon test should use dh or ecdh anon keyexchange
ssl: Correct key_usage check
ssl: Fix ECDSA key decode clause
ssl: Avoid hardcoding of cipher suites and fix ECDH suite handling
ssl: Run all test case combinations
ssl: Correct ECC suite and DTLS ECC handling
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* sverker/kernel/silence-dialyzer/OTP-15170:
kernel: Silence dialyzer
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* john/erts/inet-drv-race/OTP-15158/ERL-654:
Fix a race condition when generating async operation ids
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Using direct pattern matching on the map is more effient than pattern
matching on the result of maps:find/2, because it avoids allocating the
intermediate tuple.
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If negotiating TLS 1.2, TLS 1.3 servers MUST set the last eight bytes
of their Random value to the bytes:
44 4F 57 4E 47 52 44 01
If negotiating TLS 1.1 or below, TLS 1.3 servers MUST and TLS 1.2
servers SHOULD set the last eight bytes of their Random value to the
bytes:
44 4F 57 4E 47 52 44 00
Change-Id: If35112f63f42a9af351f4ca9b1846fd3f5b08167
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- Introduce new macro ALL_TLS_RECORD_VERSIONS to decouple
ALL_AVAILABLE_VERSIONS from the list of valid TLS record
versions. It consists of versions allowed in
TLSCiphertext.version (TLS 1.2 and prior) and
TLSCiphertext.legacy_record_version (TLS 1.3).
- TLS 1.3 sets TLSCiphertext.legacy_record_version to 0x0303
for all records generated other than an initial ClientHello,
where it MAY also be 0x0301.
- TLSPlaintext.legacy_record_version is ignored.
Change-Id: Iabb1a954ab21f8be012e6460ae99ab533e31e123
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