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The SSA compiler branch is smart enough to recognize that the code
past 'after infinity' is unreachable, so our test vectors weren't
always kept alive.
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This commit replaces the old memory instrumentation with a new
implementation that scans carriers instead of wrapping
erts_alloc/erts_free. The old implementation could not extract
information without halting the emulator, had considerable runtime
overhead, and the memory maps it produced were noisy and lacked
critical information.
Since the new implementation walks through existing data structures
there's no longer a need to start the emulator with special flags to
get information about carrier utilization/fragmentation. Memory
fragmentation is also easier to diagnose as it's presented on a
per-carrier basis which eliminates the need to account for "holes"
between mmap segments.
To help track allocations, each allocation can now be tagged with
what it is and who allocated it at the cost of one extra word per
allocation. This is controlled on a per-allocator basis with the
+M<S>atags option, and is enabled by default for binary_alloc and
driver_alloc (which is also used by NIFs).
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* egil/tools/modernize-tests:
tools: Don't divide by zero in tests
Fix instruments_SUITE sumblock check
Eliminate use of doc and suite clauses
Replace ?t with test_server
Use test_server:is_debug/0 instead of custom check
Replace use of test_server:format/2 with io:format/2
Eliminate use of ?config() macro
Eliminate use of test_server:fail/0,1
Eliminate erlang:now/0
Modernize use of timetraps
Remove ?line macros
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Those clause are obsolete and never used by common_test.
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The macro ?t is deprecated. Replace its use with 'test_server'.
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As a first step to removing the test_server application as
as its own separate application, change the inclusion of
test_server.hrl to an inclusion of ct.hrl and remove the
inclusion of test_server_line.hrl.
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