When a BPF program is used to filter or redirect packets in the networking subsystem, the program will often want to associate data with each packet as it moves through the kernel. The kernel's
local BPF storage API, which
associates extra data with some kernel objects, provides a way to do that. (See also
the BPF map types that end
in STORAGE.)
Amery Hung and Jakub Sitnicki led two sessions
at the 2026
Linux Storage, Filesystem, Memory-Management, and BPF Summit
about how to make accesses to local storage data more efficient. Hung spoke about general performance problems related to locking, while Sitnicki examined the use of local storage in the networking subsystem in particular.
https://lwn.net/Articles/1078968/
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