Allocations profiler

[Dawid Weiss]

> I am not sure how they are able to pull off low-overhead profiling like
> that.

Just guessing but I think these may be separate problems (and separate
benchmarks); if you're profiling memory allocations you don't care (or
shouldn't look at) performance numbers.

I'm not saying it's easy to do or derive clear conclusions from
numbers (considering TLABs, different GCs, local optimizations like
escape analysis, etc.), but in many cases it's easy to spot relatively
simple problems.

Dawid