Ritesh Oedayrajsingh Varma

A system freeze led us deep into Linux spinlock internals, where we helped find not one but three bugs in the kernel’s resilient locking code used by eBPF.

A story about how an innocent profiling session led to a change to the Linux kernel that makes eBPF map-in-map updates much faster.

For the Linux version of Superluminal we rely on unwind information stored in the .eh_frame section in a binary to perform stack unwinding. We’ll go over optimizations we made to libdwarf that greatly improve the performance of retrieving this information.