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authorJohn Högberg <[email protected]>2018-03-27 13:14:40 +0200
committerJohn Högberg <[email protected]>2018-04-23 13:13:53 +0200
commit573a5abd9d6b1668b49376b489b187780c7125c7 (patch)
treefe720d8a93b7a5199c2ef2ffe306396a6cb13f92 /lib/observer/vsn.mk
parent26d72d02167aed57e43f1ad669039b96aa154fb8 (diff)
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erts: Rewrite memory instrumentation
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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