ianlevesque added a comment. Thanks @MaskRay - I tried to answer that question in https://reviews.llvm.org/D87953#2286430. At present we are deploying instrumentation to an arbitrary subset of our application using the instruction threshold. I would like to make the selection of how many and which functions more deterministic, and be able to instrument different subsets over time. The overhead we are concerned with is purely binary size as we are deploying to Android devices. We are using features from my previous XRay patches to omit the function index already, but the sheer number of sleds and size of the associated xray_instr_map are the limiting factor of how much we can instrument in any given app release. For our use case it is fine to gradually over a period of weeks work our way across the entire app group by group.
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