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This PR contains what I think is a minimal set of changes necessary to compile and run this extension as-is on Ruby 2.4 and 2.5.
Fixes #16.
The one part I'm a little uneasy about is that the
GC.stat(:heap_swept_slots)
counter was removed in Ruby 2.4 due to some internal refactoring of the mark-and-sweep algorithm, and I'm not sure if replacing this counter with[edit:0
heap_marked_slots
] in the calculation ofallocation_limit
will impact this behavior significantly- I don't fully understand the Ruby GC-implementation internals to be confident in that,or even whether this will work or be useful in Ruby 2.5 at all for that matter[edit: I've run this PR in production for several months now, and it has been useful].In any case this is a starting point I plan to use for profiling my own web-application through a Ruby upgrade, and I'm sharing it here in case others might find it useful as well.