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===What is inlining and why does it matter?===

===What is inlining and why does it matter?===

[https://en.wikipedia.org/wiki/Inline_expansion Inlining] is when the JIT takes a method call and sticks the body of the function called instead of emitting an actual call. If this happens, a harmony patch applied to the callee will not take effect.

[https://en.wikipedia.org/wiki/Inline_expansion Inlining] is when the JIT takes a method call and sticks the body of the method called instead of emitting an actual call. If this happens, a harmony patch applied to the callee will not take effect.

The heuristics the JIT uses to decide whether or not to inline a method are not documented and are subject to change, but [https://stackoverflow.com/a/31467000/19366602 small, simple methods that do not throw exceptions] are the most likely to be inlined. Additionally, the heuristic seems to change between platform and platform, with mac being more aggressive than Windows.

The heuristics the JIT uses to decide whether or not to inline a method are not documented and are subject to change, but [https://stackoverflow.com/a/31467000/19366602 small, simple methods that do not throw exceptions] are the most likely to be inlined. Additionally, the heuristic seems to change between platform and platform, with mac being more aggressive than Windows.