Summary

nextCanonicalDouble() is called in two per-operation code paths for probabilistic sampling decisions: slow-op logging (shouldLogSlowOpWithSampling) and interrupt tracking (CurOp::startTime). On ARM (Graviton), this triggers logl() via std::uniform_real_distribution, which operates on 128-bit quad-precision long double - entirely software-emulated with no hardware floating-point support.

Profiling shows __logl_finite consuming 5.2% of CPU on a Graviton instance running YCSB 100 read.