[$] Efficient access to local storage for BPF programs

When a BPF program is used to filter or redirect packets in the networkingsubsystem, the program will often want to associate data with each packet as itmoves through the kernel. The kernel'slocal BPF storage API, whichassociates extra data with some kernel objects, provides a way to do that. (See alsothe BPF map types that endin STORAGE.)Amery Hung and Jakub Sitnicki led two sessionsat the 2026Linux Storage, Filesystem, Memory-Management, and BPF Summitabout how to make accesses to local storage data more efficient. Hung spokeabout general performance problems related to locking, while Sitnicki examinedthe use of local storage in the networking subsystem in particular.