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OTP-9810
OTP-9812
OTP-9813
OTP-9814
OTP-9818
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* 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
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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.
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An incorrect spec, rpc:yield/1, has been fixed.
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In embedded mode, all on_load handlers will be called after
loading all modules but before starting any servers. Therefore,
if an on_load handler calls any function in the code module that
calls the code server (such as code:priv_dir/1), there will be a
deadlock because the code server has not yet been started.
Fix this problem by invoking the on_load handlers after
having started most servers in the kernel application.
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This is the public interface of prim_zip:open/3,
which has been used in earlier releases by both
erl_prim_loader and escript. The new function
can be used as a replacement for the undocumented
function escript:foldl/3 that is likely to be
removed without further notice.
The error handling of prim_zip:open/3 (and
prim_zip:foldl/3) has been improved in order to
better suite a public interface. For example it
could happen that a file or a zlib port could be
left open in some errors cases.
The documentation of the FileSpec parameter to
zip:create/3 has been updated to show that
file info can be explicitly specified. A FileSpec
may contain {Filename, binary(), #file_info{}}
elements. The function zip:create/3 was already
prepared to partly support this, but now after
a few minor fixes it is fully supported.
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An on_load function is supposed to return 'true' to indicate
that the module should be loaded, and 'false' if it should be
unloaded. But returning any other term, as well as causing an
exception, will also unload the module.
Since we don't like boolean values mixed with other values,
change the expected return value as follows:
* If 'ok' is returned, the module will remain loaded and become
callable.
* If any other value is returned (or an exception is generated),
the module will be unloaded. Also, if the returned value is
not an atom, send a warning message to the error_logger
(using error_logger:warning_msg/2).
The new interpretation of the return value means that an on_load
function can now directly return the return value from
erlang:load_nif/2.
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